implot/implot.cpp

// MIT License

// Copyright (c) 2020 Evan Pezent

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

// ImPlot v0.2 WIP

/*

API BREAKING CHANGES
====================
Occasionally introducing changes that are breaking the API. We try to make the breakage minor and easy to fix.
Below is a change-log of API breaking changes only. If you are using one of the functions listed, expect to have to fix some code.
When you are not sure about a old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all implot files.
You can read releases logs https://github.com/epezent/implot/releases for more details.

- 2020/05/16 (0.2) - All plotting functions were reverted to being prefixed with "Plot" to maintain a consistent VerbNoun style. `Plot` was split into `PlotLine`
                     and `PlotScatter` (however, `PlotLine` can still be used to plot scatter points as `Plot` did before.)
- 2020/05/13 (0.2) - `ImMarker` was change to `ImPlotMarker` and `ImAxisFlags` was changed to `ImPlotAxisFlags`.
- 2020/05/11 (0.2) - `ImPlotFlags_Selection` was changed to `ImPlotFlags_BoxSelect`
- 2020/05/11 (0.2) - The namespace ImGui:: was replaced with ImPlot::. As a result, the following additional changes were made:
                     - Functions that were prefixed or decorated with the word "Plot" have been truncated. E.g., `ImGui::PlotBar` is now just `ImPlot::Bar`.
                       It should be fairly obvious what was what.
                     - Some functions have been given names that would have otherwise collided with the ImGui namespace. This has been done to maintain a consistent
                       style with ImGui. E.g., 'ImGui::PushPlotStyleVar` is now 'ImPlot::PushStyleVar'.
- 2020/05/10 (0.2) - The following function/struct names were changes:
                    - ImPlotRange       -> ImPlotLimits
                    - GetPlotRange()    -> GetPlotLimits()
                    - SetNextPlotRange  -> SetNextPlotLimits
                    - SetNextPlotRangeX -> SetNextPlotLimitsX
                    - SetNextPlotRangeY -> SetNextPlotLimitsY
- 2020/05/10 (0.2) - Plot queries are pixel based by default. Query rects that maintain relative plot position have been removed. This was done to support multi-y-axis.

*/

#ifndef IMGUI_DEFINE_MATH_OPERATORS
#define IMGUI_DEFINE_MATH_OPERATORS
#endif

#include "implot.h"
#include "imgui_internal.h"

#ifdef _MSC_VER
#define sprintf sprintf_s
#endif

#define IM_NORMALIZE2F_OVER_ZERO(VX, VY)                                                           \
    {                                                                                              \
        float d2 = VX * VX + VY * VY;                                                              \
        if (d2 > 0.0f) {                                                                           \
            float inv_len = 1.0f / ImSqrt(d2);                                                     \
            VX *= inv_len;                                                                         \
            VY *= inv_len;                                                                         \
        }                                                                                          \
    }

// Special Color used to specific that a plot item color should set determined automatically.
#define IM_COL_AUTO ImVec4(0,0,0,-1)
// The maximum number of support y-axes
#define MAX_Y_AXES 3

ImPlotStyle::ImPlotStyle() {
    LineWeight = 1;
    Marker = ImPlotMarker_None;
    MarkerSize = 4;
    MarkerWeight = 1;
    ErrorBarSize = 5;
    ErrorBarWeight = 1.5;
    DigitalBitHeight = 8;

    Colors[ImPlotCol_Line]          = IM_COL_AUTO;
    Colors[ImPlotCol_Fill]          = IM_COL_AUTO;
    Colors[ImPlotCol_MarkerOutline] = IM_COL_AUTO;
    Colors[ImPlotCol_MarkerFill]    = IM_COL_AUTO;
    Colors[ImPlotCol_ErrorBar]      = IM_COL_AUTO;
    Colors[ImPlotCol_FrameBg]       = IM_COL_AUTO;
    Colors[ImPlotCol_PlotBg]        = IM_COL_AUTO;
    Colors[ImPlotCol_PlotBorder]    = IM_COL_AUTO;
    Colors[ImPlotCol_XAxis]         = IM_COL_AUTO;
    Colors[ImPlotCol_YAxis]         = IM_COL_AUTO;
    Colors[ImPlotCol_YAxis2]        = IM_COL_AUTO;
    Colors[ImPlotCol_YAxis3]        = IM_COL_AUTO;
    Colors[ImPlotCol_Selection]     = ImVec4(1,1,0,1);
    Colors[ImPlotCol_Query]         = ImVec4(0,1,0,1);
}

ImPlotRange::ImPlotRange() : Min(NAN), Max(NAN) {}

bool ImPlotRange::Contains(float v) const {
    return v >= Min && v <= Max;
}

float ImPlotRange::Size() const {
    return Max - Min;
}

ImPlotLimits::ImPlotLimits() {}

bool ImPlotLimits::Contains(const ImVec2& p) const {
    return X.Contains(p.x) && Y.Contains(p.y);
}

ImVec2 ImPlotLimits::Size() const {
    return ImVec2(X.Size(),Y.Size());
}

namespace ImPlot {

namespace {

//-----------------------------------------------------------------------------
// Private Utils
//-----------------------------------------------------------------------------

/// Returns true if a flag is set
template <typename TSet, typename TFlag>
inline bool HasFlag(TSet set, TFlag flag) {
    return (set & flag) == flag;
}

/// Flips a flag in a flagset
template <typename TSet, typename TFlag>
inline void FlipFlag(TSet& set, TFlag flag) {
    HasFlag(set, flag) ? set &= ~flag : set |= flag;
}

/// Linearly remaps float x from [x0 x1] to [y0 y1].
inline float Remap(float x, float x0, float x1, float y0, float y1) {
    return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
}

/// Turns NANs to 0s
inline float ConstrainNan(float val) {
    return isnan(val) ? 0 : val;
}

/// Turns INFINITYs to FLT_MAXs
inline float ConstrainInf(float val) {
    return val == INFINITY ? FLT_MAX : val == -INFINITY ? -FLT_MAX : val;
}

/// Turns numbers less than or equal to 0 to 0.001 (sort of arbitrary, is there a better way?)
inline float ConstrainLog(float val) {
    return val <= 0 ? 0.001f : val;
}

/// Returns true if val is NAN or INFINITY
inline bool NanOrInf(float val) {
    return val == INFINITY || val == -INFINITY || isnan(val);
}

/// Utility function to that rounds x to powers of 2,5 and 10 for generating axis labels
/// Taken from Graphics Gems 1 Chapter 11.2, "Nice Numbers for Graph Labels"
inline double NiceNum(double x, bool round) {
    double f;  /* fractional part of x */
    double nf; /* nice, rounded fraction */
    int expv = (int)floor(log10(x));
    f = x / ImPow(10.0, (double)expv); /* between 1 and 10 */
    if (round)
        if (f < 1.5)
            nf = 1;
        else if (f < 3)
            nf = 2;
        else if (f < 7)
            nf = 5;
        else
            nf = 10;
    else if (f <= 1)
        nf = 1;
    else if (f <= 2)
        nf = 2;
    else if (f <= 5)
        nf = 5;
    else
        nf = 10;
    return nf * ImPow(10.0, expv);
}

/// Draws vertical text. The position is the bottom left of the text rect.
inline void AddTextVertical(ImDrawList *DrawList, const char *text, ImVec2 pos, ImU32 text_color) {
    pos.x                   = IM_ROUND(pos.x);
    pos.y                   = IM_ROUND(pos.y);
    ImFont *           font = GImGui->Font;
    const ImFontGlyph *glyph;
    for (char c = *text++; c; c = *text++) {
        glyph = font->FindGlyph(c);
        if (!glyph)
            continue;

        DrawList->PrimReserve(6, 4);
        DrawList->PrimQuadUV(
            pos + ImVec2(glyph->Y0, -glyph->X0), pos + ImVec2(glyph->Y0, -glyph->X1),
            pos + ImVec2(glyph->Y1, -glyph->X1), pos + ImVec2(glyph->Y1, -glyph->X0),

            ImVec2(glyph->U0, glyph->V0), ImVec2(glyph->U1, glyph->V0),
            ImVec2(glyph->U1, glyph->V1), ImVec2(glyph->U0, glyph->V1), text_color);
        pos.y -= glyph->AdvanceX;
    }
}

/// Calculates the size of vertical text
inline ImVec2 CalcTextSizeVertical(const char *text) {
    ImVec2 sz = ImGui::CalcTextSize(text);
    return ImVec2(sz.y, sz.x);
}

} // private namespace

//-----------------------------------------------------------------------------
// Forwards
//-----------------------------------------------------------------------------

ImVec4 NextColor();

//-----------------------------------------------------------------------------
// Structs
//-----------------------------------------------------------------------------

/// Tick mark info
struct ImTick {
    ImTick(double value, bool major, bool render_label = true) {
        PlotPos = value;
        Major = major;
        RenderLabel = render_label;
    }
    double PlotPos;
    float  PixelPos;
    ImVec2 Size;
    int    TextOffset;    
    bool   Major;
    bool   RenderLabel;    
};

struct ImPlotItem {
    ImPlotItem() {
        Show = true;
        Highlight = false;
        Color = NextColor();
        NameOffset = -1;
        ID = 0;
    }
    ~ImPlotItem() { ID = 0; }
    bool Show;
    bool Highlight;
    ImVec4 Color;
    int NameOffset;
    ImGuiID ID;
};

/// Plot axis structure. You shouldn't need to construct this!
struct ImPlotAxis {
    ImPlotAxis() {
        Dragging = false;
        Range.Min = 0;
        Range.Max = 1;
        Divisions = 3;
        Subdivisions = 10;
        Flags = PreviousFlags = ImPlotAxisFlags_Default;
    }
    bool Dragging;
    ImPlotRange Range;
    int Divisions;
    int Subdivisions;
    ImPlotAxisFlags Flags, PreviousFlags;
};

/// Holds Plot state information that must persist between frames
struct ImPlotState {
    ImPlotState() {
        Selecting = Querying = Queried = DraggingQuery = false;
        SelectStart =  QueryStart = ImVec2(0,0);
        Flags = PreviousFlags = ImPlotFlags_Default;
        ColorIdx = 0;
        CurrentYAxis = 0;
    }
    ImPool<ImPlotItem> Items;

    ImRect BB_Legend;
    ImVec2 SelectStart;
    bool Selecting;
    bool Querying;
    bool Queried;
    bool DraggingQuery;
    ImVec2 QueryStart;
    ImRect QueryRect; // relative to BB_grid!!

    ImPlotAxis XAxis;
    ImPlotAxis YAxis[MAX_Y_AXES];

    ImPlotFlags Flags, PreviousFlags;
    int ColorIdx;
    int CurrentYAxis;
};

struct ImNextPlotData {
    ImGuiCond XRangeCond;
    ImGuiCond YRangeCond[MAX_Y_AXES];
    bool HasXRange;
    bool HasYRange[MAX_Y_AXES];
    ImPlotRange X;
    ImPlotRange Y[MAX_Y_AXES];
};

/// Holds Plot state information that must persist only between calls to BeginPlot()/EndPlot()
struct ImPlotContext {
    ImPlotContext() : RenderX(), RenderY() {
        CurrentPlot = NULL;
        FitThisFrame = FitX = false;
        RestorePalette();
    }

    /// ALl Plots
    ImPool<ImPlotState> Plots;
    /// Current Plot
    ImPlotState* CurrentPlot;
    // Legend
    ImVector<int> LegendIndices;
    ImGuiTextBuffer LegendLabels;
    // Bounding regions
    ImRect BB_Frame;
    ImRect BB_Canvas;
    ImRect BB_Grid;
    // Cached Colors
    ImU32 Col_Frame, Col_Bg, Col_Border,
          Col_Txt, Col_TxtDis,
          Col_SlctBg, Col_SlctBd,
          Col_QryBg, Col_QryBd;
    struct AxisColor {
        AxisColor() : Major(), Minor(), Txt() {}
        ImU32 Major, Minor, Txt;
    };
    AxisColor Col_X;
    AxisColor Col_Y[MAX_Y_AXES];
    // Tick marks
    ImVector<ImTick> XTicks,  YTicks[MAX_Y_AXES];
    ImGuiTextBuffer XTickLabels, YTickLabels[MAX_Y_AXES];
    float AxisLabelReference[MAX_Y_AXES];
    // Transformation cache
    ImRect PixelRange[MAX_Y_AXES];
    // linear scale (slope)
    float Mx;
    float My[MAX_Y_AXES];
    // log scale denominator
    float LogDenX;
    float LogDenY[MAX_Y_AXES];
    // Data extents
    ImPlotRange ExtentsX;
    ImPlotRange ExtentsY[MAX_Y_AXES];
    int VisibleItemCount;
    bool FitThisFrame; bool FitX;
    bool FitY[MAX_Y_AXES] = {};
    // Hover states
    bool Hov_Frame;
    bool Hov_Grid;    
    // Render flags
    bool RenderX, RenderY[MAX_Y_AXES];
    // Mouse pos
    ImVec2 LastMousePos[MAX_Y_AXES];
    // Style
    ImVector<ImVec4> ColorMap;
    ImPlotStyle Style;
    ImVector<ImGuiColorMod> ColorModifiers;  // Stack for PushStyleColor()/PopStyleColor()
    ImVector<ImGuiStyleMod> StyleModifiers;  // Stack for PushStyleVar()/PopStyleVar()
    ImNextPlotData NextPlotData;
    // Digital plot item count
    int DigitalPlotItemCnt;
    int DigitalPlotOffset;
};

/// Global plot context
static ImPlotContext gp;

//-----------------------------------------------------------------------------
// Utils
//-----------------------------------------------------------------------------

/// Returns the next unused default plot color
ImVec4 NextColor() {
    ImVec4 col  = gp.ColorMap[gp.CurrentPlot->ColorIdx % gp.ColorMap.size()];
    gp.CurrentPlot->ColorIdx++;
    return col;
}

inline void FitPoint(const ImVec2& p) {
    ImPlotRange* extents_x = &gp.ExtentsX;
    ImPlotRange* extents_y = &gp.ExtentsY[gp.CurrentPlot->CurrentYAxis];
    if (!NanOrInf(p.x)) {
        extents_x->Min = p.x < extents_x->Min ? p.x : extents_x->Min;
        extents_x->Max = p.x > extents_x->Max ? p.x : extents_x->Max;
    }
    if (!NanOrInf(p.y)) {
        extents_y->Min = p.y < extents_y->Min ? p.y : extents_y->Min;
        extents_y->Max = p.y > extents_y->Max ? p.y : extents_y->Max;
    }
}

//-----------------------------------------------------------------------------
// Coordinate Transforms
//-----------------------------------------------------------------------------

inline void UpdateTransformCache() {
    // get pixels for transforms

    for (int i = 0; i < MAX_Y_AXES; i++) {
        gp.PixelRange[i] = ImRect(HasFlag(gp.CurrentPlot->XAxis.Flags, ImPlotAxisFlags_Invert) ? gp.BB_Grid.Max.x : gp.BB_Grid.Min.x,
                                  HasFlag(gp.CurrentPlot->YAxis[i].Flags, ImPlotAxisFlags_Invert) ? gp.BB_Grid.Min.y : gp.BB_Grid.Max.y,
                                  HasFlag(gp.CurrentPlot->XAxis.Flags, ImPlotAxisFlags_Invert) ? gp.BB_Grid.Min.x : gp.BB_Grid.Max.x,
                                  HasFlag(gp.CurrentPlot->YAxis[i].Flags, ImPlotAxisFlags_Invert) ? gp.BB_Grid.Max.y : gp.BB_Grid.Min.y);

        gp.My[i] = (gp.PixelRange[i].Max.y - gp.PixelRange[i].Min.y) / gp.CurrentPlot->YAxis[i].Range.Size();
    }
    gp.LogDenX = log10(gp.CurrentPlot->XAxis.Range.Max / gp.CurrentPlot->XAxis.Range.Min);
    for (int i = 0; i < MAX_Y_AXES; i++) {
        gp.LogDenY[i] = log10(gp.CurrentPlot->YAxis[i].Range.Max / gp.CurrentPlot->YAxis[i].Range.Min);
    }
    gp.Mx = (gp.PixelRange[0].Max.x - gp.PixelRange[0].Min.x) / gp.CurrentPlot->XAxis.Range.Size();
}

inline ImVec2 PixelsToPlot(float x, float y, int y_axis_in = -1) {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PixelsToPlot() Needs to be called between BeginPlot() and EndPlot()!");
    const int y_axis = y_axis_in >= 0 ? y_axis_in : gp.CurrentPlot->CurrentYAxis;
    ImVec2 plt;
    plt.x = (x - gp.PixelRange[y_axis].Min.x) / gp.Mx + gp.CurrentPlot->XAxis.Range.Min;
    plt.y = (y - gp.PixelRange[y_axis].Min.y) / gp.My[y_axis] + gp.CurrentPlot->YAxis[y_axis].Range.Min;
    if (HasFlag(gp.CurrentPlot->XAxis.Flags, ImPlotAxisFlags_LogScale)) {
        float t = (plt.x - gp.CurrentPlot->XAxis.Range.Min) / gp.CurrentPlot->XAxis.Range.Size();
        plt.x = pow(10.0f, t * gp.LogDenX) * gp.CurrentPlot->XAxis.Range.Min;
    }
    if (HasFlag(gp.CurrentPlot->YAxis[y_axis].Flags, ImPlotAxisFlags_LogScale)) {
        float t = (plt.y - gp.CurrentPlot->YAxis[y_axis].Range.Min) / gp.CurrentPlot->YAxis[y_axis].Range.Size();
        plt.y = pow(10.0f, t * gp.LogDenY[y_axis]) * gp.CurrentPlot->YAxis[y_axis].Range.Min;
    }
    return plt;
}

ImVec2 PixelsToPlot(const ImVec2& pix, int y_axis) {
    return PixelsToPlot(pix.x, pix.y, y_axis);
}

// This function is convenient but should not be used to process a high volume of points. Use the Transformer structs below instead.
inline ImVec2 PlotToPixels(float x, float y, int y_axis_in = -1) {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PlotToPixels() Needs to be called between BeginPlot() and EndPlot()!");
    const int y_axis = y_axis_in >= 0 ? y_axis_in : gp.CurrentPlot->CurrentYAxis;
    ImVec2 pix;
    if (HasFlag(gp.CurrentPlot->XAxis.Flags, ImPlotAxisFlags_LogScale)) {
        float t = log10(x / gp.CurrentPlot->XAxis.Range.Min) / gp.LogDenX;
        x       = ImLerp(gp.CurrentPlot->XAxis.Range.Min, gp.CurrentPlot->XAxis.Range.Max, t);
    }
    if (HasFlag(gp.CurrentPlot->YAxis[y_axis].Flags, ImPlotAxisFlags_LogScale)) {
        float t = log10(y / gp.CurrentPlot->YAxis[y_axis].Range.Min) / gp.LogDenY[y_axis];
        y       = ImLerp(gp.CurrentPlot->YAxis[y_axis].Range.Min, gp.CurrentPlot->YAxis[y_axis].Range.Max, t);
    }
    pix.x = gp.PixelRange[y_axis].Min.x + gp.Mx * (x - gp.CurrentPlot->XAxis.Range.Min);
    pix.y = gp.PixelRange[y_axis].Min.y + gp.My[y_axis] * (y - gp.CurrentPlot->YAxis[y_axis].Range.Min);
    return pix;
}

// This function is convenient but should not be used to process a high volume of points. Use the Transformer structs below instead.
ImVec2 PlotToPixels(const ImVec2& plt, int y_axis) {
    return PlotToPixels(plt.x, plt.y, y_axis);
}

// Transformer structs

struct Plt2PixLinLin {
    Plt2PixLinLin(int y_axis_in) : y_axis(y_axis_in) {}

    ImVec2 operator()(const ImVec2& plt) { return (*this)(plt.x, plt.y); }
    ImVec2 operator()(float x, float y) {
        return ImVec2( gp.PixelRange[y_axis].Min.x + gp.Mx * (x - gp.CurrentPlot->XAxis.Range.Min),
                 gp.PixelRange[y_axis].Min.y + gp.My[y_axis] * (y - gp.CurrentPlot->YAxis[y_axis].Range.Min) );
    }

    int y_axis;
};

struct Plt2PixLogLin {
    Plt2PixLogLin(int y_axis_in) : y_axis(y_axis_in) {}

    ImVec2 operator()(const ImVec2& plt) { return (*this)(plt.x, plt.y); }
    ImVec2 operator()(float x, float y) {
        float t = log10(x / gp.CurrentPlot->XAxis.Range.Min) / gp.LogDenX;
        x       = ImLerp(gp.CurrentPlot->XAxis.Range.Min, gp.CurrentPlot->XAxis.Range.Max, t);
        return ImVec2( gp.PixelRange[y_axis].Min.x + gp.Mx * (x - gp.CurrentPlot->XAxis.Range.Min),
                 gp.PixelRange[y_axis].Min.y + gp.My[y_axis] * (y - gp.CurrentPlot->YAxis[y_axis].Range.Min) );
    }

    int y_axis;
};

struct Plt2PixLinLog {
    Plt2PixLinLog(int y_axis_in) : y_axis(y_axis_in) {}

    ImVec2 operator()(const ImVec2& plt) { return (*this)(plt.x, plt.y); }
    ImVec2 operator()(float x, float y) {
        float t = log10(y / gp.CurrentPlot->YAxis[y_axis].Range.Min) / gp.LogDenY[y_axis];
        y       = ImLerp(gp.CurrentPlot->YAxis[y_axis].Range.Min, gp.CurrentPlot->YAxis[y_axis].Range.Max, t);
        return ImVec2( gp.PixelRange[y_axis].Min.x + gp.Mx * (x - gp.CurrentPlot->XAxis.Range.Min),
                 gp.PixelRange[y_axis].Min.y + gp.My[y_axis] * (y - gp.CurrentPlot->YAxis[y_axis].Range.Min) );
    }

    int y_axis;
};

struct Plt2PixLogLog {
    Plt2PixLogLog(int y_axis_in) : y_axis(y_axis_in) {}

    ImVec2 operator()(const ImVec2& plt) { return (*this)(plt.x, plt.y); }
    ImVec2 operator()(float x, float y) {
        float t = log10(x / gp.CurrentPlot->XAxis.Range.Min) / gp.LogDenX;
        x       = ImLerp(gp.CurrentPlot->XAxis.Range.Min, gp.CurrentPlot->XAxis.Range.Max, t);
        t       = log10(y / gp.CurrentPlot->YAxis[y_axis].Range.Min) / gp.LogDenY[y_axis];
        y       = ImLerp(gp.CurrentPlot->YAxis[y_axis].Range.Min, gp.CurrentPlot->YAxis[y_axis].Range.Max, t);
        return ImVec2( gp.PixelRange[y_axis].Min.x + gp.Mx * (x - gp.CurrentPlot->XAxis.Range.Min),
                 gp.PixelRange[y_axis].Min.y + gp.My[y_axis] * (y - gp.CurrentPlot->YAxis[y_axis].Range.Min) );
    }

    int y_axis;
};

//-----------------------------------------------------------------------------
// Legend Utils
//-----------------------------------------------------------------------------

ImPlotItem* RegisterItem(const char* label_id) {
    ImGuiID id = ImGui::GetID(label_id);
    ImPlotItem* item = gp.CurrentPlot->Items.GetOrAddByKey(id);
    int idx = gp.CurrentPlot->Items.GetIndex(item);
    item->ID = id;
    gp.LegendIndices.push_back(idx);
    item->NameOffset = gp.LegendLabels.size();
    gp.LegendLabels.append(label_id, label_id + strlen(label_id) + 1);
    if (item->Show)
        gp.VisibleItemCount++;
    return item;
}

int GetLegendCount() {
    return gp.LegendIndices.size();
}

ImPlotItem* GetLegendItem(int i) {
    return gp.CurrentPlot->Items.GetByIndex(gp.LegendIndices[i]);
}

const char* GetLegendLabel(int i) {
    ImPlotItem* item  = gp.CurrentPlot->Items.GetByIndex(gp.LegendIndices[i]);
    IM_ASSERT(item->NameOffset != -1 && item->NameOffset < gp.LegendLabels.Buf.Size);
    return gp.LegendLabels.Buf.Data + item->NameOffset;
}

//-----------------------------------------------------------------------------
// Tick Utils
//-----------------------------------------------------------------------------

inline void GetTicks(const ImPlotRange& scale, int nMajor, int nMinor, bool logscale, ImVector<ImTick> &out) {
    out.shrink(0);
    if (logscale) {
        if (scale.Min <= 0 || scale.Max <= 0)
            return;
        int exp_min = (int)(ImFloor(log10(scale.Min)));
        int exp_max = (int)(ImCeil(log10(scale.Max)));
        for (int e = exp_min - 1; e < exp_max + 1; ++e) {
            double major1 = ImPow(10, (double)(e));
            double major2 = ImPow(10, (double)(e + 1));
            double interval = (major2 - major1) / 9;
            if (major1 >= (scale.Min - FLT_EPSILON) && major1 <= (scale.Max + FLT_EPSILON))
                out.push_back(ImTick(major1, true));
            for (int i = 1; i < 9; ++i) {
                double minor = major1 + i * interval;
                if (minor >= (scale.Min - FLT_EPSILON) && minor <= (scale.Max + FLT_EPSILON))
                    out.push_back(ImTick(minor, false, false));
            }
        }
    }
    else {
        const double range    = NiceNum(scale.Max - scale.Min, 0);
        const double interval = NiceNum(range / (nMajor - 1), 1);
        const double graphmin = floor(scale.Min / interval) * interval;
        const double graphmax = ceil(scale.Max / interval) * interval;
        for (double major = graphmin; major < graphmax + 0.5 * interval; major += interval) {
            if (major >= scale.Min && major <= scale.Max)
                out.push_back(ImTick(major, true));
            for (int i = 1; i < nMinor; ++i) {
                double minor = major + i * interval / nMinor;
                if (minor >= scale.Min && minor <= scale.Max)
                    out.push_back(ImTick(minor, false));
            }
        }
    }
}

inline void LabelTicks(ImVector<ImTick> &ticks, bool scientific, ImGuiTextBuffer& buffer) {
    buffer.Buf.resize(0);
    char temp[32];
    for (int t = 0; t < ticks.Size; t++) {
        ImTick *tk = &ticks[t];
        if (tk->RenderLabel) {
            tk->TextOffset = buffer.size();
            if (scientific)
                sprintf(temp, "%.0e", tk->PlotPos);
            else
                sprintf(temp, "%g", tk->PlotPos);
            buffer.append(temp, temp + strlen(temp) + 1);
            tk->Size = ImGui::CalcTextSize(buffer.Buf.Data + tk->TextOffset);
        }
    }
}

namespace {
struct AxisState {
    ImPlotAxis* axis;
    bool has_range;
    ImGuiCond range_cond;
    bool present;
    int present_so_far;
    bool flip;
    bool lock_min;
    bool lock_max;
    bool lock;

    AxisState(ImPlotAxis& axis_in, bool has_range_in, ImGuiCond range_cond_in,
              bool present_in, int previous_present)
            : axis(&axis_in),
              has_range(has_range_in),
              range_cond(range_cond_in),
              present(present_in),
              present_so_far(previous_present + (present ? 1 : 0)),
              flip(HasFlag(axis->Flags, ImPlotAxisFlags_Invert)),
              lock_min(HasFlag(axis->Flags, ImPlotAxisFlags_LockMin)),
              lock_max(HasFlag(axis->Flags, ImPlotAxisFlags_LockMax)),
              lock(present && ((lock_min && lock_max) || (has_range && range_cond == ImGuiCond_Always))) {}

    AxisState()
            : axis(),
              has_range(),
              range_cond(),
              present(),
              present_so_far(),
              flip(),
              lock_min(),
              lock_max(),
              lock() {}
};

void UpdateAxisColor(int axis_flag, ImPlotContext::AxisColor* col) {
    const ImVec4 col_Axis = gp.Style.Colors[axis_flag].w == -1 ? ImGui::GetStyle().Colors[ImGuiCol_Text] * ImVec4(1, 1, 1, 0.25f) : gp.Style.Colors[axis_flag];
    col->Major = ImGui::GetColorU32(col_Axis);
    col->Minor = ImGui::GetColorU32(col_Axis * ImVec4(1, 1, 1, 0.25f));
    col->Txt   = ImGui::GetColorU32(ImVec4(col_Axis.x, col_Axis.y, col_Axis.z, 1));
}

ImRect GetAxisScale(int y_axis, float tx, float ty, float zoom_rate) {
    return ImRect(
            PixelsToPlot(gp.BB_Grid.Min - gp.BB_Grid.GetSize() * ImVec2(tx * zoom_rate, ty * zoom_rate), y_axis),
            PixelsToPlot(gp.BB_Grid.Max + gp.BB_Grid.GetSize() * ImVec2((1 - tx) * zoom_rate, (1 - ty) * zoom_rate), y_axis));
}

class YPadCalculator {
  public:
    YPadCalculator(const AxisState* axis_states, const float* max_label_widths, float txt_off)
            : AxisStates(axis_states), MaxLabelWidths(max_label_widths), TxtOff(txt_off) {}

    float operator()(int y_axis) {
        ImPlotState& plot = *gp.CurrentPlot;
        if (!AxisStates[y_axis].present) { return 0; }
        // If we have more than 1 axis present before us, then we need
        // extra space to account for our tick bar.
        float pad_result = 0;
        if (AxisStates[y_axis].present_so_far >= 3) {
            pad_result += 6.0f;
        }
        if (!HasFlag(plot.YAxis[y_axis].Flags, ImPlotAxisFlags_TickLabels)) {
            return pad_result;
        }
        pad_result += MaxLabelWidths[y_axis] + TxtOff;
        return pad_result;
    }

  private:
    const AxisState* const AxisStates;
    const float* const MaxLabelWidths;
    const float TxtOff;
};
}  // namespace

//-----------------------------------------------------------------------------
// BeginPlot()
//-----------------------------------------------------------------------------

bool BeginPlot(const char* title, const char* x_label, const char* y_label, const ImVec2& size, ImPlotFlags flags, ImPlotAxisFlags x_flags, ImPlotAxisFlags y_flags, ImPlotAxisFlags y2_flags, ImPlotAxisFlags y3_flags) {

    IM_ASSERT_USER_ERROR(gp.CurrentPlot == NULL, "Mismatched BeginPlot()/EndPlot()!");

    // FRONT MATTER  -----------------------------------------------------------

    ImGuiContext &G      = *GImGui;
    ImGuiWindow * Window = G.CurrentWindow;
    if (Window->SkipItems) {
        gp.NextPlotData = ImNextPlotData();
        return false;
    }

    const ImGuiID     ID       = Window->GetID(title);
    const ImGuiStyle &Style    = G.Style;
    const ImGuiIO &   IO       = ImGui::GetIO();

    bool just_created = gp.Plots.GetByKey(ID) == NULL;
    gp.CurrentPlot = gp.Plots.GetOrAddByKey(ID);
    ImPlotState &plot = *gp.CurrentPlot;

    plot.CurrentYAxis = 0;

    if (just_created) {
        plot.Flags          = flags;
        plot.XAxis.Flags    = x_flags;
        plot.YAxis[0].Flags = y_flags;
        plot.YAxis[1].Flags = y2_flags;
        plot.YAxis[2].Flags = y3_flags;
    }
    else {
        // TODO: Check which individual flags changed, and only reset those!
        // There's probably an easy bit mask trick I'm not aware of.
        if (flags != plot.PreviousFlags)
            plot.Flags = flags;
        if (y_flags != plot.YAxis[0].PreviousFlags)
            plot.YAxis[0].PreviousFlags = y_flags;
        if (y2_flags != plot.YAxis[1].PreviousFlags)
            plot.YAxis[1].PreviousFlags = y2_flags;
        if (y3_flags != plot.YAxis[2].PreviousFlags)
            plot.YAxis[2].PreviousFlags = y3_flags;
    }

    plot.PreviousFlags          = flags;
    plot.XAxis.PreviousFlags    = x_flags;
    plot.YAxis[0].PreviousFlags = y_flags;
    plot.YAxis[1].PreviousFlags = y2_flags;
    plot.YAxis[2].PreviousFlags = y3_flags;

    // capture scroll with a child region
    const float default_w = 400;
    const float default_h = 300;
    if (!HasFlag(plot.Flags, ImPlotFlags_NoChild)) {
        ImGui::BeginChild(title, ImVec2(size.x == 0 ? default_w : size.x, size.y == 0 ? default_h : size.y));
        Window = ImGui::GetCurrentWindow();
        Window->ScrollMax.y = 1.0f;
    }

    ImDrawList &DrawList = *Window->DrawList;

    // NextPlotData -----------------------------------------------------------

    if (gp.NextPlotData.HasXRange) {
        if (just_created || gp.NextPlotData.XRangeCond == ImGuiCond_Always)
        {
            plot.XAxis.Range = gp.NextPlotData.X;
        }
    }

    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (gp.NextPlotData.HasYRange[i]) {
            if (just_created || gp.NextPlotData.YRangeCond[i] == ImGuiCond_Always)
            {
                plot.YAxis[i].Range = gp.NextPlotData.Y[i];
            }
        }
    }

    // AXIS STATES ------------------------------------------------------------
    AxisState x(plot.XAxis, gp.NextPlotData.HasXRange, gp.NextPlotData.XRangeCond, true, 0);
    AxisState y[MAX_Y_AXES];
    y[0] = AxisState(plot.YAxis[0], gp.NextPlotData.HasYRange[0], gp.NextPlotData.YRangeCond[0], true, 0);
    y[1] = AxisState(plot.YAxis[1], gp.NextPlotData.HasYRange[1], gp.NextPlotData.YRangeCond[1],
                     HasFlag(plot.Flags, ImPlotFlags_YAxis2), y[0].present_so_far);
    y[2] = AxisState(plot.YAxis[2], gp.NextPlotData.HasYRange[2], gp.NextPlotData.YRangeCond[2],
                     HasFlag(plot.Flags, ImPlotFlags_YAxis3), y[1].present_so_far);

    const bool lock_plot  = x.lock && y[0].lock && y[1].lock && y[2].lock;

    // CONSTRAINTS ------------------------------------------------------------

    plot.XAxis.Range.Min = ConstrainNan(ConstrainInf(plot.XAxis.Range.Min));
    plot.XAxis.Range.Max = ConstrainNan(ConstrainInf(plot.XAxis.Range.Max));
    for (int i = 0; i < MAX_Y_AXES; i++) {
        plot.YAxis[i].Range.Min = ConstrainNan(ConstrainInf(plot.YAxis[i].Range.Min));
        plot.YAxis[i].Range.Max = ConstrainNan(ConstrainInf(plot.YAxis[i].Range.Max));
    }

    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_LogScale))
        plot.XAxis.Range.Min = ConstrainLog(plot.XAxis.Range.Min);
    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_LogScale))
        plot.XAxis.Range.Max = ConstrainLog(plot.XAxis.Range.Max);
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_LogScale))
            plot.YAxis[i].Range.Min = ConstrainLog(plot.YAxis[i].Range.Min);
        if (HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_LogScale))
            plot.YAxis[i].Range.Max = ConstrainLog(plot.YAxis[i].Range.Max);
    }

    if (plot.XAxis.Range.Max <= plot.XAxis.Range.Min)
        plot.XAxis.Range.Max = plot.XAxis.Range.Min + FLT_EPSILON;
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (plot.YAxis[i].Range.Max <= plot.YAxis[i].Range.Min)
            plot.YAxis[i].Range.Max = plot.YAxis[i].Range.Min + FLT_EPSILON;
    }

    // adaptive divisions
    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_Adaptive)) {
        plot.XAxis.Divisions = (int)IM_ROUND(0.003 * gp.BB_Canvas.GetWidth());
        if (plot.XAxis.Divisions < 2)
            plot.XAxis.Divisions = 2;
    }
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_Adaptive)) {
            plot.YAxis[i].Divisions = (int)IM_ROUND(0.003 * gp.BB_Canvas.GetHeight());
            if (plot.YAxis[i].Divisions < 2)
                plot.YAxis[i].Divisions = 2;
        }
    }

    // COLORS -----------------------------------------------------------------

    gp.Col_Frame  = gp.Style.Colors[ImPlotCol_FrameBg].w     == -1 ? ImGui::GetColorU32(ImGuiCol_FrameBg)    : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_FrameBg]);
    gp.Col_Bg     = gp.Style.Colors[ImPlotCol_PlotBg].w      == -1 ? ImGui::GetColorU32(ImGuiCol_WindowBg)   : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_PlotBg]);
    gp.Col_Border = gp.Style.Colors[ImPlotCol_PlotBorder].w  == -1 ? ImGui::GetColorU32(ImGuiCol_Text, 0.5f) : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_PlotBorder]);

    UpdateAxisColor(ImPlotCol_XAxis, &gp.Col_X);
    UpdateAxisColor(ImPlotCol_YAxis, &gp.Col_Y[0]);
    UpdateAxisColor(ImPlotCol_YAxis2, &gp.Col_Y[1]);
    UpdateAxisColor(ImPlotCol_YAxis3, &gp.Col_Y[2]);

    gp.Col_Txt    = ImGui::GetColorU32(ImGuiCol_Text);
    gp.Col_TxtDis = ImGui::GetColorU32(ImGuiCol_TextDisabled);
    gp.Col_SlctBg = ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Selection] * ImVec4(1,1,1,0.25f));
    gp.Col_SlctBd = ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Selection]);
    gp.Col_QryBg =  ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Query] * ImVec4(1,1,1,0.25f));
    gp.Col_QryBd =  ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Query]);

    // BB AND HOVER -----------------------------------------------------------

    // frame
    const ImVec2 frame_size = ImGui::CalcItemSize(size, default_w, default_h);
    gp.BB_Frame = ImRect(Window->DC.CursorPos, Window->DC.CursorPos + frame_size);
    ImGui::ItemSize(gp.BB_Frame);
    if (!ImGui::ItemAdd(gp.BB_Frame, 0, &gp.BB_Frame)) {
        gp.NextPlotData = ImNextPlotData();
        gp.CurrentPlot = NULL;
        if (!HasFlag(plot.Flags, ImPlotFlags_NoChild))
            ImGui::EndChild();
        return false;
    }
    gp.Hov_Frame = ImGui::ItemHoverable(gp.BB_Frame, ID);
    ImGui::RenderFrame(gp.BB_Frame.Min, gp.BB_Frame.Max, gp.Col_Frame, true, Style.FrameRounding);

    // canvas bb
    gp.BB_Canvas = ImRect(gp.BB_Frame.Min + Style.WindowPadding, gp.BB_Frame.Max - Style.WindowPadding);

    gp.RenderX = (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_GridLines) ||
                    HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_TickMarks) ||
                    HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_TickLabels)) &&  plot.XAxis.Divisions > 1;
    for (int i = 0; i < MAX_Y_AXES; i++) {
        gp.RenderY[i] =
                y[i].present &&
                (HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_GridLines) ||
                 HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_TickMarks) ||
                 HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_TickLabels)) &&  plot.YAxis[i].Divisions > 1;
    }

    // get ticks
    if (gp.RenderX)
        GetTicks(plot.XAxis.Range, plot.XAxis.Divisions, plot.XAxis.Subdivisions, HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_LogScale), gp.XTicks);
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (gp.RenderY[i]) {
            GetTicks(plot.YAxis[i].Range, plot.YAxis[i].Divisions, plot.YAxis[i].Subdivisions, HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_LogScale), gp.YTicks[i]);
        }
    }

    // label ticks
    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_TickLabels))
        LabelTicks(gp.XTicks, HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_Scientific), gp.XTickLabels);

    float max_label_width[MAX_Y_AXES] = {};
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (y[i].present && HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_TickLabels)) {
            LabelTicks(gp.YTicks[i], HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_Scientific), gp.YTickLabels[i]);
            for (int t = 0; t < gp.YTicks[i].Size; t++) {
                ImTick *yt = &gp.YTicks[i][t];
                max_label_width[i] = yt->Size.x > max_label_width[i] ? yt->Size.x : max_label_width[i];
            }
        }
    }

    // grid bb
    const ImVec2 title_size = ImGui::CalcTextSize(title, NULL, true);
    const float txt_off     = 5;
    const float txt_height  = ImGui::GetTextLineHeight();
    const float pad_top     = title_size.x > 0.0f ? txt_height + txt_off : 0;
    const float pad_bot     = (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_TickLabels) ? txt_height + txt_off : 0) + (x_label ? txt_height + txt_off : 0);
    YPadCalculator y_axis_pad(y, max_label_width, txt_off);
    const float pad_left    = y_axis_pad(0) + (y_label ? txt_height + txt_off : 0);
    const float pad_right   = y_axis_pad(1) + y_axis_pad(2);
    gp.BB_Grid              = ImRect(gp.BB_Canvas.Min + ImVec2(pad_left, pad_top), gp.BB_Canvas.Max - ImVec2(pad_right, pad_bot));
    gp.Hov_Grid             = gp.BB_Grid.Contains(IO.MousePos);

    // axis region bbs
    const ImRect xAxisRegion_bb(gp.BB_Grid.Min + ImVec2(10, 0), ImVec2(gp.BB_Grid.Max.x, gp.BB_Frame.Max.y) - ImVec2(10, 0));
    const bool   hov_x_axis_region = xAxisRegion_bb.Contains(IO.MousePos);

    // The left labels are referenced to the left of the bounding box.
    gp.AxisLabelReference[0] = gp.BB_Grid.Min.x;
    // If Y axis 1 is present, its labels will be referenced to the
    // right of the bounding box.
    gp.AxisLabelReference[1] = gp.BB_Grid.Max.x;
    // The third axis may be either referenced to the right of the
    // bounding box, or 6 pixels further past the end of the 2nd axis.
    gp.AxisLabelReference[2] =
            !y[1].present ?
            gp.BB_Grid.Max.x :
            (gp.AxisLabelReference[1] + y_axis_pad(1) + 6);

    ImRect yAxisRegion_bb[MAX_Y_AXES];
    yAxisRegion_bb[0] = ImRect(ImVec2(gp.BB_Frame.Min.x, gp.BB_Grid.Min.y), ImVec2(gp.BB_Grid.Min.x + 6, gp.BB_Grid.Max.y - 10));
    // The auxiliary y axes are off to the right of the BB grid.
    yAxisRegion_bb[1] = ImRect(ImVec2(gp.BB_Grid.Max.x - 6, gp.BB_Grid.Min.y),
                               gp.BB_Grid.Max + ImVec2(y_axis_pad(1), 0));
    yAxisRegion_bb[2] = ImRect(ImVec2(gp.AxisLabelReference[2] - 6, gp.BB_Grid.Min.y),
                               yAxisRegion_bb[1].Max + ImVec2(y_axis_pad(2), 0));

    ImRect centralRegion(ImVec2(gp.BB_Grid.Min.x + 6, gp.BB_Grid.Min.y),
                         ImVec2(gp.BB_Grid.Max.x - 6, gp.BB_Grid.Max.y));

    const bool hov_y_axis_region[MAX_Y_AXES] = {
        y[0].present && (yAxisRegion_bb[0].Contains(IO.MousePos) || centralRegion.Contains(IO.MousePos)),
        y[1].present && (yAxisRegion_bb[1].Contains(IO.MousePos) || centralRegion.Contains(IO.MousePos)),
        y[2].present && (yAxisRegion_bb[2].Contains(IO.MousePos) || centralRegion.Contains(IO.MousePos)),
    };
    const bool any_hov_y_axis_region = hov_y_axis_region[0] || hov_y_axis_region[1] || hov_y_axis_region[2];

    // legend hovered from last frame
    const bool hov_legend = HasFlag(plot.Flags, ImPlotFlags_Legend) ? gp.Hov_Frame && plot.BB_Legend.Contains(IO.MousePos) : false;

    bool hov_query = false;
    if (gp.Hov_Frame && gp.Hov_Grid && plot.Queried && !plot.Querying) {
        ImRect bb_query = plot.QueryRect;

        bb_query.Min += gp.BB_Grid.Min;
        bb_query.Max += gp.BB_Grid.Min;

        hov_query = bb_query.Contains(IO.MousePos);
    }

    // QUERY DRAG -------------------------------------------------------------
    if (plot.DraggingQuery && (IO.MouseReleased[0] || !IO.MouseDown[0])) {
        plot.DraggingQuery = false;
    }
    if (plot.DraggingQuery) {
        ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeAll);
        plot.QueryRect.Min += IO.MouseDelta;
        plot.QueryRect.Max += IO.MouseDelta;
    }
    if (gp.Hov_Frame && gp.Hov_Grid && hov_query && !plot.DraggingQuery && !plot.Selecting && !hov_legend) {
        ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeAll);
        const bool any_y_dragging = plot.YAxis[0].Dragging || plot.YAxis[1].Dragging || plot.YAxis[2].Dragging;
        if (IO.MouseDown[0] && !plot.XAxis.Dragging && !any_y_dragging) {
            plot.DraggingQuery = true;
        }
    }

    // DRAG INPUT -------------------------------------------------------------


    // end drags
    if (plot.XAxis.Dragging && (IO.MouseReleased[0] || !IO.MouseDown[0])) {
        plot.XAxis.Dragging             = false;
        G.IO.MouseDragMaxDistanceSqr[0] = 0;
    }
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (plot.YAxis[i].Dragging && (IO.MouseReleased[0] || !IO.MouseDown[0])) {
            plot.YAxis[i].Dragging             = false;
            G.IO.MouseDragMaxDistanceSqr[0] = 0;
        }
    }
    const bool any_y_dragging = plot.YAxis[0].Dragging || plot.YAxis[1].Dragging || plot.YAxis[2].Dragging;
    bool drag_in_progress = plot.XAxis.Dragging || any_y_dragging;
    // do drag
    if (drag_in_progress) {
        UpdateTransformCache();
        if (!x.lock && plot.XAxis.Dragging) {
            ImVec2 plot_tl = PixelsToPlot(gp.BB_Grid.Min - IO.MouseDelta, 0);
            ImVec2 plot_br = PixelsToPlot(gp.BB_Grid.Max - IO.MouseDelta, 0);
            if (!x.lock_min)
                plot.XAxis.Range.Min = x.flip ? plot_br.x : plot_tl.x;
            if (!x.lock_max)
                plot.XAxis.Range.Max = x.flip ? plot_tl.x : plot_br.x;
        }
        for (int i = 0; i < MAX_Y_AXES; i++) {
            if (!y[i].lock && plot.YAxis[i].Dragging) {
                ImVec2 plot_tl = PixelsToPlot(gp.BB_Grid.Min - IO.MouseDelta, i);
                ImVec2 plot_br = PixelsToPlot(gp.BB_Grid.Max - IO.MouseDelta, i);

                if (!y[i].lock_min)
                    plot.YAxis[i].Range.Min = y[i].flip ? plot_tl.y : plot_br.y;
                if (!y[i].lock_max)
                    plot.YAxis[i].Range.Max = y[i].flip ? plot_br.y : plot_tl.y;
            }
        }
        // Set the mouse cursor based on which axes are moving.
        int direction = 0;
        if (!x.lock && plot.XAxis.Dragging) {
            direction |= (1 << 1);
        }
        for (int i = 0; i < MAX_Y_AXES; i++) {
            if (!y[i].present) { continue; }
            if (!y[i].lock && plot.YAxis[i].Dragging) {
                direction |= (1 << 2);
                break;
            }
        }

        if (direction == 0) {
            ImGui::SetMouseCursor(ImGuiMouseCursor_NotAllowed);
        } else if (direction == (1 << 1)) {
            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeEW);
        } else if (direction == (1 << 2)) {
            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeNS);
        } else {
            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeAll);
        }
    }
    // start drag
    if (!drag_in_progress && gp.Hov_Frame && IO.MouseDragMaxDistanceSqr[0] > 5 && !plot.Selecting && !hov_legend && !hov_query && !plot.DraggingQuery) {
        if (hov_x_axis_region) {
            plot.XAxis.Dragging = true;
        }
        for (int i = 0; i < MAX_Y_AXES; i++) {
            if (hov_y_axis_region[i]) {
                plot.YAxis[i].Dragging = true;
            }
        }
    }

    // SCROLL INPUT -----------------------------------------------------------

    if (gp.Hov_Frame && (hov_x_axis_region || any_hov_y_axis_region) && IO.MouseWheel != 0) {
        UpdateTransformCache();
        float zoom_rate = 0.1f;
        if (IO.MouseWheel > 0)
            zoom_rate = (-zoom_rate) / (1.0f + (2.0f * zoom_rate));
        float tx = Remap(IO.MousePos.x, gp.BB_Grid.Min.x, gp.BB_Grid.Max.x, 0, 1);
        float ty = Remap(IO.MousePos.y, gp.BB_Grid.Min.y, gp.BB_Grid.Max.y, 0, 1);
        if (hov_x_axis_region && !x.lock) {
            ImRect axis_scale = GetAxisScale(0, tx, ty, zoom_rate);
            const ImVec2& plot_tl = axis_scale.Min;
            const ImVec2& plot_br = axis_scale.Max;

            if (!x.lock_min)
                plot.XAxis.Range.Min = x.flip ? plot_br.x : plot_tl.x;
            if (!x.lock_max)
                plot.XAxis.Range.Max = x.flip ? plot_tl.x : plot_br.x;
        }
        for (int i = 0; i < MAX_Y_AXES; i++) {
            if (hov_y_axis_region[i] && !y[i].lock) {
                ImRect axis_scale = GetAxisScale(i, tx, ty, zoom_rate);
                const ImVec2& plot_tl = axis_scale.Min;
                const ImVec2& plot_br = axis_scale.Max;

                if (!y[i].lock_min)
                    plot.YAxis[i].Range.Min = y[i].flip ? plot_tl.y : plot_br.y;
                if (!y[i].lock_max)
                    plot.YAxis[i].Range.Max = y[i].flip ? plot_br.y : plot_tl.y;
            }
        }
    }

    // BOX-SELECTION AND QUERY ------------------------------------------------

    // confirm selection
    if (plot.Selecting && (IO.MouseReleased[1] || !IO.MouseDown[1])) {
        UpdateTransformCache();
        ImVec2 select_size = plot.SelectStart - IO.MousePos;
        if (HasFlag(plot.Flags, ImPlotFlags_BoxSelect) && ImFabs(select_size.x) > 2 && ImFabs(select_size.y) > 2) {
            ImVec2 p1 = PixelsToPlot(plot.SelectStart);
            ImVec2 p2 = PixelsToPlot(IO.MousePos);
            if (!x.lock_min && !IO.KeyAlt)
                plot.XAxis.Range.Min = ImMin(p1.x, p2.x);
            if (!x.lock_max && !IO.KeyAlt)
                plot.XAxis.Range.Max = ImMax(p1.x, p2.x);
            for (int i = 0; i < MAX_Y_AXES; i++) {
                p1 = PixelsToPlot(plot.SelectStart, i);
                p2 = PixelsToPlot(IO.MousePos, i);
                if (!y[i].lock_min && !IO.KeyShift)
                    plot.YAxis[i].Range.Min = ImMin(p1.y, p2.y);
                if (!y[i].lock_max && !IO.KeyShift)
                    plot.YAxis[i].Range.Max = ImMax(p1.y, p2.y);
            }
        }
        plot.Selecting = false;
    }
    // bad selection
    if (plot.Selecting && (!HasFlag(plot.Flags, ImPlotFlags_BoxSelect) || lock_plot) && ImLengthSqr(plot.SelectStart - IO.MousePos) > 4) {
        ImGui::SetMouseCursor(ImGuiMouseCursor_NotAllowed);
    }
    // cancel selection
    if (plot.Selecting && (IO.MouseClicked[0] || IO.MouseDown[0])) {
        plot.Selecting = false;
    }
    // begin selection or query
    if (gp.Hov_Frame && gp.Hov_Grid && IO.MouseClicked[1]) {
        plot.SelectStart = IO.MousePos;
        plot.Selecting = true;
    }
    // update query
    if (plot.Querying) {
        UpdateTransformCache();
        plot.QueryRect.Min.x = IO.KeyAlt ? gp.BB_Grid.Min.x :   ImMin(plot.QueryStart.x, IO.MousePos.x);
        plot.QueryRect.Max.x = IO.KeyAlt ? gp.BB_Grid.Max.x :   ImMax(plot.QueryStart.x, IO.MousePos.x);
        plot.QueryRect.Min.y = IO.KeyShift ? gp.BB_Grid.Min.y : ImMin(plot.QueryStart.y, IO.MousePos.y);
        plot.QueryRect.Max.y = IO.KeyShift ? gp.BB_Grid.Max.y : ImMax(plot.QueryStart.y, IO.MousePos.y);

        plot.QueryRect.Min -= gp.BB_Grid.Min;
        plot.QueryRect.Max -= gp.BB_Grid.Min;
    }
    // end query
    if (plot.Querying && (IO.MouseReleased[2] || IO.MouseReleased[1])) {
        plot.Querying = false;
        if (plot.QueryRect.GetWidth() > 2 && plot.QueryRect.GetHeight() > 2) {
            plot.Queried = true;
        }
        else {
            plot.Queried = false;
        }
    }
    // begin query
    if (HasFlag(plot.Flags, ImPlotFlags_Query) && (gp.Hov_Frame && gp.Hov_Grid && IO.MouseClicked[2])) {
        plot.QueryRect = ImRect(0,0,0,0);
        plot.Querying = true;
        plot.Queried  = true;
        plot.QueryStart = IO.MousePos;
    }
    // toggle between select/query
    if (HasFlag(plot.Flags, ImPlotFlags_Query) && plot.Selecting && IO.KeyCtrl) {
        plot.Selecting = false;
        plot.QueryRect = ImRect(0,0,0,0);
        plot.Querying = true;
        plot.Queried  = true;
        plot.QueryStart = plot.SelectStart;
    }
    if (HasFlag(plot.Flags, ImPlotFlags_BoxSelect) && plot.Querying && !IO.KeyCtrl && !IO.MouseDown[2]) {
        plot.Selecting = true;
        plot.Querying = false;
        plot.Queried = false;
        plot.QueryRect = ImRect(0,0,0,0);
    }

    // DOUBLE CLICK -----------------------------------------------------------

    if ( IO.MouseDoubleClicked[0] && gp.Hov_Frame && (hov_x_axis_region || any_hov_y_axis_region) && !hov_legend && !hov_query) {
        gp.FitThisFrame = true;
        gp.FitX = hov_x_axis_region;
        for (int i = 0; i < MAX_Y_AXES; i++) {
            gp.FitY[i] = hov_y_axis_region[i];
        }
    }
    else {
        gp.FitThisFrame = false;
        gp.FitX = false;
        for (int i = 0; i < MAX_Y_AXES; i++) {
            gp.FitY[i] = false;
        }
    }

    // FOCUS ------------------------------------------------------------------

    // focus window
    if ((IO.MouseClicked[0] || IO.MouseClicked[1]) && gp.Hov_Frame)
        ImGui::FocusWindow(ImGui::GetCurrentWindow());

    UpdateTransformCache();

    // set mouse position
    for (int i = 0; i < MAX_Y_AXES; i++) {
        gp.LastMousePos[i] = PixelsToPlot(IO.MousePos, i);
    }

    // RENDER -----------------------------------------------------------------

    // grid bg
    DrawList.AddRectFilled(gp.BB_Grid.Min, gp.BB_Grid.Max, gp.Col_Bg);

    // render axes
    PushPlotClipRect();

    // transform ticks
    if (gp.RenderX) {
        for (int t = 0; t < gp.XTicks.Size; t++) {
            ImTick *xt = &gp.XTicks[t];
            xt->PixelPos = PlotToPixels((float)xt->PlotPos, 0, 0).x;
        }
    }
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (gp.RenderY[i]) {
            for (int t = 0; t < gp.YTicks[i].Size; t++) {
                ImTick *yt = &gp.YTicks[i][t];
                yt->PixelPos = PlotToPixels(0, (float)yt->PlotPos, i).y;
            }
        }
    }

    // render grid
    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_GridLines)) {
        for (int t = 0; t < gp.XTicks.Size; t++) {
            ImTick *xt = &gp.XTicks[t];
            DrawList.AddLine(ImVec2(xt->PixelPos, gp.BB_Grid.Min.y), ImVec2(xt->PixelPos, gp.BB_Grid.Max.y), xt->Major ? gp.Col_X.Major : gp.Col_X.Minor, 1);
        }
    }

    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (y[i].present && HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_GridLines)) {
            for (int t = 0; t < gp.YTicks[i].Size; t++) {
                ImTick *yt = &gp.YTicks[i][t];
                DrawList.AddLine(ImVec2(gp.BB_Grid.Min.x, yt->PixelPos), ImVec2(gp.BB_Grid.Max.x, yt->PixelPos), yt->Major ? gp.Col_Y[i].Major : gp.Col_Y[i].Minor, 1);
            }
        }
    }

    PopPlotClipRect();

    // render title
    if (title_size.x > 0.0f) {
        ImGui::RenderText(ImVec2(gp.BB_Canvas.GetCenter().x - title_size.x * 0.5f, gp.BB_Canvas.Min.y), title, NULL, true);
    }

    // render labels
    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_TickLabels)) {
        ImGui::PushClipRect(gp.BB_Frame.Min, gp.BB_Frame.Max, true);
        for (int t = 0; t < gp.XTicks.Size; t++) {
            ImTick *xt = &gp.XTicks[t];
            if (xt->RenderLabel && xt->PixelPos >= gp.BB_Grid.Min.x - 1 && xt->PixelPos <= gp.BB_Grid.Max.x + 1)
                DrawList.AddText(ImVec2(xt->PixelPos - xt->Size.x * 0.5f, gp.BB_Grid.Max.y + txt_off), gp.Col_X.Txt, gp.XTickLabels.Buf.Data + xt->TextOffset);
        }
        ImGui::PopClipRect();
    }
    if (x_label) {
        const ImVec2 xLabel_size = ImGui::CalcTextSize(x_label);
        const ImVec2 xLabel_pos(gp.BB_Grid.GetCenter().x - xLabel_size.x * 0.5f,
                                gp.BB_Canvas.Max.y - txt_height);
        DrawList.AddText(xLabel_pos, gp.Col_X.Txt, x_label);
    }
    ImGui::PushClipRect(gp.BB_Frame.Min, gp.BB_Frame.Max, true);
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (y[i].present && HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_TickLabels)) {
            const float x_start =
                    gp.AxisLabelReference[i] +
                    ((i == 0) ?
                     (-txt_off - max_label_width[0]) :
                     txt_off);
            for (int t = 0; t < gp.YTicks[i].Size; t++) {
                ImTick *yt = &gp.YTicks[i][t];
                if (yt->RenderLabel && yt->PixelPos >= gp.BB_Grid.Min.y - 1 && yt->PixelPos <= gp.BB_Grid.Max.y + 1) {
                    ImVec2 start(x_start, yt->PixelPos - 0.5f * yt->Size.y);
                    DrawList.AddText(start, gp.Col_Y[i].Txt, gp.YTickLabels[i].Buf.Data + yt->TextOffset);
                }
            }
        }
    }
    ImGui::PopClipRect();
    if (y_label) {
        const ImVec2 yLabel_size = CalcTextSizeVertical(y_label);
        const ImVec2 yLabel_pos(gp.BB_Canvas.Min.x, gp.BB_Grid.GetCenter().y + yLabel_size.y * 0.5f);
        AddTextVertical(&DrawList, y_label, yLabel_pos, gp.Col_Y[0].Txt);
    }

    // PREP -------------------------------------------------------------------

    // push plot ID into stack
    ImGui::PushID(ID);
    // reset items count
    gp.VisibleItemCount = 0;
    // reset extents
    gp.ExtentsX.Min = INFINITY;
    gp.ExtentsX.Max = -INFINITY;
    for (int i = 0; i < MAX_Y_AXES; i++) {
        gp.ExtentsY[i].Min = INFINITY;
        gp.ExtentsY[i].Max = -INFINITY;
    }
    // clear item names
    gp.LegendLabels.Buf.resize(0);
    // reset digital plot items count
    gp.DigitalPlotItemCnt = 0;
    gp.DigitalPlotOffset = 0;
    return true;
}

//-----------------------------------------------------------------------------
// Context Menu
//-----------------------------------------------------------------------------

inline void AxisMenu(ImPlotAxis& Axis) {
     ImGui::PushItemWidth(75);
    bool lock_min = HasFlag(Axis.Flags, ImPlotAxisFlags_LockMin);
    bool lock_max = HasFlag(Axis.Flags, ImPlotAxisFlags_LockMax);
    bool invert   = HasFlag(Axis.Flags, ImPlotAxisFlags_Invert);
    bool logscale = HasFlag(Axis.Flags, ImPlotAxisFlags_LogScale);
    bool grid     = HasFlag(Axis.Flags, ImPlotAxisFlags_GridLines);
    bool ticks    = HasFlag(Axis.Flags, ImPlotAxisFlags_TickMarks);
    bool labels   = HasFlag(Axis.Flags, ImPlotAxisFlags_TickLabels);
    if (ImGui::Checkbox("##LockMin", &lock_min))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_LockMin);
    ImGui::SameLine();
    if (lock_min) {
        ImGui::PushItemFlag(ImGuiItemFlags_Disabled, true);
        ImGui::PushStyleVar(ImGuiStyleVar_Alpha, ImGui::GetStyle().Alpha * 0.25f);
    }
    ImGui::DragFloat("Min", &Axis.Range.Min, 0.01f + 0.01f * (Axis.Range.Size()), -INFINITY, Axis.Range.Max - FLT_EPSILON);
    if (lock_min) {
        ImGui::PopItemFlag();
        ImGui::PopStyleVar();    }

    if (ImGui::Checkbox("##LockMax", &lock_max))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_LockMax);
    ImGui::SameLine();
    if (lock_max) {
        ImGui::PushItemFlag(ImGuiItemFlags_Disabled, true);
        ImGui::PushStyleVar(ImGuiStyleVar_Alpha, ImGui::GetStyle().Alpha * 0.25f);    }
    ImGui::DragFloat("Max", &Axis.Range.Max, 0.01f + 0.01f * (Axis.Range.Size()), Axis.Range.Min + FLT_EPSILON, INFINITY);
    if (lock_max) {
        ImGui::PopItemFlag();
        ImGui::PopStyleVar();
    }
    ImGui::Separator();
    if (ImGui::Checkbox("Invert", &invert))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_Invert);
    if (ImGui::Checkbox("Log Scale", &logscale))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_LogScale);
    ImGui::Separator();
    if (ImGui::Checkbox("Grid Lines", &grid))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_GridLines);
    if (ImGui::Checkbox("Tick Marks", &ticks))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_TickMarks);
    if (ImGui::Checkbox("Labels", &labels))
        FlipFlag(Axis.Flags, ImPlotAxisFlags_TickLabels);
}

void PlotContextMenu(ImPlotState& plot) {
    if (ImGui::BeginMenu("X-Axis")) {
        ImGui::PushID("X");
        AxisMenu(plot.XAxis);
        ImGui::PopID();
        ImGui::EndMenu();
    }
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (i == 1 && !HasFlag(plot.Flags, ImPlotFlags_YAxis2)) {
            continue;
        }
        if (i == 2 && !HasFlag(plot.Flags, ImPlotFlags_YAxis3)) {
            continue;
        }
        char buf[10] = {};
        if (i == 0) {
            snprintf(buf, sizeof(buf) - 1, "Y-Axis");
        } else {
            snprintf(buf, sizeof(buf) - 1, "Y-Axis %d", i + 1);
        }
        if (ImGui::BeginMenu(buf)) {
            ImGui::PushID(i);
            AxisMenu(plot.YAxis[i]);
            ImGui::PopID();
            ImGui::EndMenu();
        }
    }

    ImGui::Separator();
    if ((ImGui::BeginMenu("Settings"))) {
        if (ImGui::MenuItem("Box Select",NULL,HasFlag(plot.Flags, ImPlotFlags_BoxSelect))) {
            FlipFlag(plot.Flags, ImPlotFlags_BoxSelect);
        }
        if (ImGui::MenuItem("Query",NULL,HasFlag(plot.Flags, ImPlotFlags_Query))) {
            FlipFlag(plot.Flags, ImPlotFlags_Query);
        }
        if (ImGui::MenuItem("Crosshairs",NULL,HasFlag(plot.Flags, ImPlotFlags_Crosshairs))) {
            FlipFlag(plot.Flags, ImPlotFlags_Crosshairs);
        }
        if (ImGui::MenuItem("Mouse Position",NULL,HasFlag(plot.Flags, ImPlotFlags_MousePos))) {
            FlipFlag(plot.Flags, ImPlotFlags_MousePos);
        }
        if (ImGui::MenuItem("Cull Data",NULL,HasFlag(plot.Flags, ImPlotFlags_CullData))) {
            FlipFlag(plot.Flags, ImPlotFlags_CullData);
        }
        if (ImGui::MenuItem("Anti-Aliased Lines",NULL,HasFlag(plot.Flags, ImPlotFlags_AntiAliased))) {
            FlipFlag(plot.Flags, ImPlotFlags_AntiAliased);
        }
        ImGui::EndMenu();
    }
    if (ImGui::MenuItem("Legend",NULL,HasFlag(plot.Flags, ImPlotFlags_Legend))) {
        FlipFlag(plot.Flags, ImPlotFlags_Legend);
    }
#if 0
    if (ImGui::BeginMenu("Metrics")) {
        ImGui::PushItemWidth(75);
        ImGui::LabelText("Plots", "%d", gp.Plots.GetSize());
        ImGui::LabelText("Color Modifiers", "%d", gp.ColorModifiers.size());
        ImGui::LabelText("Style Modifiers", "%d", gp.StyleModifiers.size());
        ImGui::PopItemWidth();
        ImGui::EndMenu();
    }
#endif

}

namespace {
class BufferWriter {
  public:
    BufferWriter(char* buffer, size_t size) : Buffer(buffer), Pos(0), Size(size) {}

    void Write(const char* fmt, ...) IM_FMTARGS(2) {
        va_list argp;
        va_start(argp, fmt);
        VWrite(fmt, argp);
        va_end(argp);
    }

  private:
    void VWrite(const char* fmt, va_list argp) {
        const int written = ::vsnprintf(&Buffer[Pos], Size - Pos - 1, fmt, argp);
        if (written > 0)
          Pos += ImMin(size_t(written), Size-Pos-1);
    }

    char* const Buffer;
    size_t Pos;
    const size_t Size;
};
}

//-----------------------------------------------------------------------------
// EndPlot()
//-----------------------------------------------------------------------------

void EndPlot() {

    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "Mismatched BeginPlot()/EndPlot()!");

    ImPlotState &plot = *gp.CurrentPlot;
    ImGuiContext &G      = *GImGui;
    ImGuiWindow * Window = G.CurrentWindow;
    ImDrawList & DrawList = *Window->DrawList;
    const ImGuiIO &   IO = ImGui::GetIO();

    // AXIS STATES ------------------------------------------------------------

    AxisState x(plot.XAxis, gp.NextPlotData.HasXRange, gp.NextPlotData.XRangeCond, true, 0);
    AxisState y[MAX_Y_AXES];
    y[0] = AxisState(plot.YAxis[0], gp.NextPlotData.HasYRange[0], gp.NextPlotData.YRangeCond[0], true, 0);
    y[1] = AxisState(plot.YAxis[1], gp.NextPlotData.HasYRange[1], gp.NextPlotData.YRangeCond[1],
                     HasFlag(plot.Flags, ImPlotFlags_YAxis2), y[0].present_so_far);
    y[2] = AxisState(plot.YAxis[2], gp.NextPlotData.HasYRange[2], gp.NextPlotData.YRangeCond[2],
                     HasFlag(plot.Flags, ImPlotFlags_YAxis3), y[1].present_so_far);

    const bool lock_plot  = x.lock && y[0].lock && y[1].lock && y[2].lock;
    const bool any_y_locked = y[0].lock || y[1].lock || y[2].lock;
    const bool any_y_dragging = plot.YAxis[0].Dragging || plot.YAxis[1].Dragging || plot.YAxis[2].Dragging;

    // FINAL RENDER -----------------------------------------------------------

    // render ticks
    PushPlotClipRect();
    if (HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_TickMarks)) {
        for (int t = 0; t < gp.XTicks.Size; t++) {
            ImTick *xt = &gp.XTicks[t];
            DrawList.AddLine(ImVec2(xt->PixelPos, gp.BB_Grid.Max.y),ImVec2(xt->PixelPos, gp.BB_Grid.Max.y - (xt->Major ? 10.0f : 5.0f)), gp.Col_Border, 1);
        }
    }
    PopPlotClipRect();

    ImGui::PushClipRect(gp.BB_Grid.Min, ImVec2(gp.BB_Frame.Max.x, gp.BB_Grid.Max.y), true);
    int axis_count = 0;
    for (int i = 0; i < MAX_Y_AXES; i++) {
        if (!y[i].present) { continue; }
        axis_count++;

        if (!HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_TickMarks)) { continue; }

        float x_start = gp.AxisLabelReference[i];
        float direction = (i == 0) ? 1.0f : -1.0f;
        bool no_major = axis_count >= 3;

        for (int t = 0; t < gp.YTicks[i].Size; t++) {
            ImTick *yt = &gp.YTicks[i][t];
            ImVec2 start = ImVec2(x_start, yt->PixelPos);

            DrawList.AddLine(
                    start,
                    start + ImVec2(direction * ((!no_major && yt->Major) ? 10.0f : 5.0f), 0),
                    gp.Col_Border, 1);
        }

        if (axis_count >= 3) {
            // Draw a bar next to the ticks to act as a visual separator.
            DrawList.AddLine(
                    ImVec2(x_start, gp.BB_Grid.Min.y),
                    ImVec2(x_start, gp.BB_Grid.Max.y),
                    gp.Col_Border, 1);
        }
    }

    ImGui::PopClipRect();

    PushPlotClipRect();
    // render selection/query
    if (plot.Selecting) {
        ImRect select_bb(ImMin(IO.MousePos, plot.SelectStart), ImMax(IO.MousePos, plot.SelectStart));
        if (plot.Selecting && !lock_plot && HasFlag(plot.Flags, ImPlotFlags_BoxSelect)) {
            if (IO.KeyAlt && IO.KeyShift && select_bb.GetWidth() > 2 && select_bb.GetHeight() > 2) {
                DrawList.AddRectFilled(gp.BB_Grid.Min, gp.BB_Grid.Max, gp.Col_SlctBg);
                DrawList.AddRect(      gp.BB_Grid.Min, gp.BB_Grid.Max, gp.Col_SlctBd);
            }
            else if ((x.lock || IO.KeyAlt) && select_bb.GetHeight() > 2) {
                DrawList.AddRectFilled(ImVec2(gp.BB_Grid.Min.x, select_bb.Min.y), ImVec2(gp.BB_Grid.Max.x, select_bb.Max.y), gp.Col_SlctBg);
                DrawList.AddRect(      ImVec2(gp.BB_Grid.Min.x, select_bb.Min.y), ImVec2(gp.BB_Grid.Max.x, select_bb.Max.y), gp.Col_SlctBd);
            }
            else if ((any_y_locked || IO.KeyShift) && select_bb.GetWidth() > 2) {
                DrawList.AddRectFilled(ImVec2(select_bb.Min.x, gp.BB_Grid.Min.y), ImVec2(select_bb.Max.x, gp.BB_Grid.Max.y), gp.Col_SlctBg);
                DrawList.AddRect(      ImVec2(select_bb.Min.x, gp.BB_Grid.Min.y), ImVec2(select_bb.Max.x, gp.BB_Grid.Max.y), gp.Col_SlctBd);
            }
            else if (select_bb.GetWidth() > 2 && select_bb.GetHeight() > 2) {
                DrawList.AddRectFilled(select_bb.Min, select_bb.Max, gp.Col_SlctBg);
                DrawList.AddRect(      select_bb.Min, select_bb.Max, gp.Col_SlctBd);
            }
        }
    }

    if (plot.Querying || plot.Queried) {
        if (plot.QueryRect.GetWidth() > 2 && plot.QueryRect.GetHeight() > 2) {
            DrawList.AddRectFilled(plot.QueryRect.Min + gp.BB_Grid.Min, plot.QueryRect.Max + gp.BB_Grid.Min, gp.Col_QryBg);
            DrawList.AddRect(      plot.QueryRect.Min + gp.BB_Grid.Min, plot.QueryRect.Max + gp.BB_Grid.Min, gp.Col_QryBd);
        }
    }
    else if (plot.Queried) {
        ImRect bb_query = plot.QueryRect;

        bb_query.Min += gp.BB_Grid.Min;
        bb_query.Max += gp.BB_Grid.Min;

        DrawList.AddRectFilled(bb_query.Min, bb_query.Max, gp.Col_QryBg);
        DrawList.AddRect(      bb_query.Min, bb_query.Max, gp.Col_QryBd);
    }

    // render legend
    const float txt_ht = ImGui::GetTextLineHeight();
    const ImVec2 legend_offset(10, 10);
    const ImVec2 legend_padding(5, 5);
    const float  legend_icon_size = txt_ht;
    ImRect legend_content_bb;
    int nItems = GetLegendCount();
    bool hov_legend = false;
    if (HasFlag(plot.Flags, ImPlotFlags_Legend) && nItems > 0) {
        // get max width
        float max_label_width = 0;
        for (int i = 0; i < nItems; ++i) {
            const char* label = GetLegendLabel(i);
            ImVec2 labelWidth = ImGui::CalcTextSize(label, NULL, true);
            max_label_width   = labelWidth.x > max_label_width ? labelWidth.x : max_label_width;
        }
        legend_content_bb = ImRect(gp.BB_Grid.Min + legend_offset, gp.BB_Grid.Min + legend_offset + ImVec2(max_label_width, nItems * txt_ht));
        plot.BB_Legend    = ImRect(legend_content_bb.Min, legend_content_bb.Max + legend_padding * 2 + ImVec2(legend_icon_size, 0));
        hov_legend = HasFlag(plot.Flags, ImPlotFlags_Legend) ? gp.Hov_Frame && plot.BB_Legend.Contains(IO.MousePos) : false;
        // render legend box
        DrawList.AddRectFilled(plot.BB_Legend.Min, plot.BB_Legend.Max, ImGui::GetColorU32(ImGuiCol_PopupBg));
        DrawList.AddRect(plot.BB_Legend.Min, plot.BB_Legend.Max, gp.Col_Border);
        // render each legend item
        for (int i = 0; i < nItems; ++i) {
            ImPlotItem* item = GetLegendItem(i);
            ImRect icon_bb;
            icon_bb.Min = legend_content_bb.Min + legend_padding + ImVec2(0, i * txt_ht) + ImVec2(2, 2);
            icon_bb.Max = legend_content_bb.Min + legend_padding + ImVec2(0, i * txt_ht) + ImVec2(legend_icon_size - 2, legend_icon_size - 2);
            ImRect label_bb;
            label_bb.Min = legend_content_bb.Min + legend_padding + ImVec2(0, i * txt_ht) + ImVec2(2, 2);
            label_bb.Max = legend_content_bb.Min + legend_padding + ImVec2(0, i * txt_ht) + ImVec2(legend_content_bb.Max.x, legend_icon_size - 2);
            ImU32 col_hl_txt;
            if (HasFlag(plot.Flags, ImPlotFlags_Highlight) && hov_legend && (icon_bb.Contains(IO.MousePos) || label_bb.Contains(IO.MousePos))) {
                item->Highlight = true;
                col_hl_txt = ImGui::GetColorU32(ImLerp(G.Style.Colors[ImGuiCol_Text], item->Color, 0.25f));
            }
            else
            {
               item->Highlight = false;
               col_hl_txt = gp.Col_Txt;
            }
            ImU32 iconColor;
            if (hov_legend && icon_bb.Contains(IO.MousePos)) {
                ImVec4 colAlpha = item->Color;
                colAlpha.w    = 0.5f;
                iconColor     = item->Show ? ImGui::GetColorU32(colAlpha)
                                          : ImGui::GetColorU32(ImGuiCol_TextDisabled, 0.5f);
                if (IO.MouseClicked[0])
                    item->Show = !item->Show;
            } else {
                iconColor = item->Show ? ImGui::GetColorU32(item->Color) : gp.Col_TxtDis;
            }
            DrawList.AddRectFilled(icon_bb.Min, icon_bb.Max, iconColor, 1);
            const char* label = GetLegendLabel(i);
            const char* text_display_end = ImGui::FindRenderedTextEnd(label, NULL);
            if (label != text_display_end)
                DrawList.AddText(legend_content_bb.Min + legend_padding + ImVec2(legend_icon_size, i * txt_ht), item->Show ? col_hl_txt  : gp.Col_TxtDis, label, text_display_end);
        }
    }

    // render crosshairs
    if (HasFlag(plot.Flags, ImPlotFlags_Crosshairs) && gp.Hov_Grid && gp.Hov_Frame &&
        !(plot.XAxis.Dragging || any_y_dragging) && !plot.Selecting && !plot.Querying && !hov_legend) {
        ImGui::SetMouseCursor(ImGuiMouseCursor_None);
        ImVec2 xy = IO.MousePos;
        ImVec2 h1(gp.BB_Grid.Min.x, xy.y);
        ImVec2 h2(xy.x - 5, xy.y);
        ImVec2 h3(xy.x + 5, xy.y);
        ImVec2 h4(gp.BB_Grid.Max.x, xy.y);
        ImVec2 v1(xy.x, gp.BB_Grid.Min.y);
        ImVec2 v2(xy.x, xy.y - 5);
        ImVec2 v3(xy.x, xy.y + 5);
        ImVec2 v4(xy.x, gp.BB_Grid.Max.y);
        DrawList.AddLine(h1, h2, gp.Col_Border);
        DrawList.AddLine(h3, h4, gp.Col_Border);
        DrawList.AddLine(v1, v2, gp.Col_Border);
        DrawList.AddLine(v3, v4, gp.Col_Border);
    }

    // render mouse pos
    if (HasFlag(plot.Flags, ImPlotFlags_MousePos) && gp.Hov_Grid) {
        char buffer[128] = {};
        BufferWriter writer(buffer, sizeof(buffer));

        writer.Write("%.2f,%.2f", gp.LastMousePos[0].x, gp.LastMousePos[0].y);
        if (HasFlag(plot.Flags, ImPlotFlags_YAxis2)) {
            writer.Write(",(%.2f)", gp.LastMousePos[1].y);
        }
        if (HasFlag(plot.Flags, ImPlotFlags_YAxis3)) {
            writer.Write(",(%.2f)", gp.LastMousePos[2].y);
        }
        ImVec2 size = ImGui::CalcTextSize(buffer);
        ImVec2 pos  = gp.BB_Grid.Max - size - ImVec2(5, 5);
        DrawList.AddText(pos, gp.Col_Txt, buffer);
    }

    PopPlotClipRect();

    // render border
    DrawList.AddRect(gp.BB_Grid.Min, gp.BB_Grid.Max, gp.Col_Border);

    // FIT DATA --------------------------------------------------------------

    if (gp.FitThisFrame && (gp.VisibleItemCount > 0 || plot.Queried)) {
        if (gp.FitX && !HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_LockMin) && !NanOrInf(gp.ExtentsX.Min)) {
            plot.XAxis.Range.Min = gp.ExtentsX.Min;
        }
        if (gp.FitX && !HasFlag(plot.XAxis.Flags, ImPlotAxisFlags_LockMax) && !NanOrInf(gp.ExtentsX.Max)) {
            plot.XAxis.Range.Max = gp.ExtentsX.Max;
        }
        for (int i = 0; i < MAX_Y_AXES; i++) {
            if (gp.FitY[i] && !HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_LockMin) && !NanOrInf(gp.ExtentsY[i].Min)) {
                plot.YAxis[i].Range.Min = gp.ExtentsY[i].Min;
            }
            if (gp.FitY[i] && !HasFlag(plot.YAxis[i].Flags, ImPlotAxisFlags_LockMax) && !NanOrInf(gp.ExtentsY[i].Max)) {
                plot.YAxis[i].Range.Max = gp.ExtentsY[i].Max;
            }
        }
    }

    // CONTEXT MENU -----------------------------------------------------------

    if (HasFlag(plot.Flags, ImPlotFlags_ContextMenu) && gp.Hov_Frame && gp.Hov_Grid && IO.MouseDoubleClicked[1] && !hov_legend)
        ImGui::OpenPopup("##Context");
    if (ImGui::BeginPopup("##Context")) {
        PlotContextMenu(plot);
        ImGui::EndPopup();
    }
    // CLEANUP ----------------------------------------------------------------

    // Reset legend items
    gp.LegendIndices.shrink(0);
    // Null current plot/data
    gp.CurrentPlot = NULL;
    // Reset next plot data
    gp.NextPlotData = ImNextPlotData();
    // Pop ImGui::PushID at the end of BeginPlot
    ImGui::PopID();
    // End child window
    if (!HasFlag(plot.Flags, ImPlotFlags_NoChild))
        ImGui::EndChild();
}

//-----------------------------------------------------------------------------
// MISC API
//-----------------------------------------------------------------------------

void SetNextPlotLimits(float x_min, float x_max, float y_min, float y_max, ImGuiCond cond) {
    SetNextPlotLimitsX(x_min, x_max, cond);
    SetNextPlotLimitsY(y_min, y_max, cond);
}

void SetNextPlotLimitsX(float x_min, float x_max, ImGuiCond cond) {
    IM_ASSERT(cond == 0 || ImIsPowerOfTwo(cond)); // Make sure the user doesn't attempt to combine multiple condition flags.
    gp.NextPlotData.HasXRange = true;
    gp.NextPlotData.XRangeCond = cond;
    gp.NextPlotData.X.Min = x_min;
    gp.NextPlotData.X.Max = x_max;
}

void SetNextPlotLimitsY(float y_min, float y_max, ImGuiCond cond, int y_axis) {
    IM_ASSERT_USER_ERROR(y_axis >= 0 && y_axis < MAX_Y_AXES, "y_axis Needs to be between 0 and MAX_Y_AXES");
    IM_ASSERT(cond == 0 || ImIsPowerOfTwo(cond)); // Make sure the user doesn't attempt to combine multiple condition flags.
    gp.NextPlotData.HasYRange[y_axis] = true;
    gp.NextPlotData.YRangeCond[y_axis] = cond;
    gp.NextPlotData.Y[y_axis].Min = y_min;
    gp.NextPlotData.Y[y_axis].Max = y_max;
}

void SetPlotYAxis(int y_axis) {
    IM_ASSERT_USER_ERROR(y_axis >= 0 && y_axis < MAX_Y_AXES, "y_axis Needs to be between 0 and MAX_Y_AXES");
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "SetPlotYAxis() Needs to be called between BeginPlot() and EndPlot()!");
    gp.CurrentPlot->CurrentYAxis = y_axis;
}

ImVec2 GetPlotPos() {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "GetPlotPos() Needs to be called between BeginPlot() and EndPlot()!");
    return gp.BB_Grid.Min;
}

ImVec2 GetPlotSize() {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "GetPlotSize() Needs to be called between BeginPlot() and EndPlot()!");
    return gp.BB_Grid.GetSize();
}

void PushPlotClipRect() {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PushPlotClipRect() Needs to be called between BeginPlot() and EndPlot()!");
    ImGui::PushClipRect(gp.BB_Grid.Min, gp.BB_Grid.Max, true);
}

void PopPlotClipRect() {
    ImGui::PopClipRect();
}

bool IsPlotHovered() {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "IsPlotHovered() Needs to be called between BeginPlot() and EndPlot()!");
    return gp.Hov_Grid;
}
ImVec2 GetPlotMousePos(int y_axis_in) {
    IM_ASSERT_USER_ERROR(y_axis_in >= -1 && y_axis_in < MAX_Y_AXES, "y_axis needs to between -1 and MAX_Y_AXES");
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "GetPlotMousePos() Needs to be called between BeginPlot() and EndPlot()!");
    const int y_axis = y_axis_in >= 0 ? y_axis_in : gp.CurrentPlot->CurrentYAxis;
    return gp.LastMousePos[y_axis];
}


ImPlotLimits GetPlotLimits(int y_axis_in) {
    IM_ASSERT_USER_ERROR(y_axis_in >= -1 && y_axis_in < MAX_Y_AXES, "y_axis needs to between -1 and MAX_Y_AXES");
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "GetPlotLimits() Needs to be called between BeginPlot() and EndPlot()!");
    const int y_axis = y_axis_in >= 0 ? y_axis_in : gp.CurrentPlot->CurrentYAxis;

    ImPlotState& plot = *gp.CurrentPlot;
    ImPlotLimits limits;
    limits.X = plot.XAxis.Range;
    limits.Y = plot.YAxis[y_axis].Range;
    return limits;
}

bool IsPlotQueried() {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "IsPlotQueried() Needs to be called between BeginPlot() and EndPlot()!");
    return gp.CurrentPlot->Queried;
}

ImPlotLimits GetPlotQuery(int y_axis_in) {
    IM_ASSERT_USER_ERROR(y_axis_in >= -1 && y_axis_in < MAX_Y_AXES, "y_axis needs to between -1 and MAX_Y_AXES");
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "GetPlotQuery() Needs to be called between BeginPlot() and EndPlot()!");
    ImPlotState& plot = *gp.CurrentPlot;
    const int y_axis = y_axis_in >= 0 ? y_axis_in : gp.CurrentPlot->CurrentYAxis;

    UpdateTransformCache();
    ImVec2 p1 = PixelsToPlot(plot.QueryRect.Min + gp.BB_Grid.Min, y_axis);
    ImVec2 p2 = PixelsToPlot(plot.QueryRect.Max + gp.BB_Grid.Min, y_axis);

    ImPlotLimits result;
    result.X.Min = ImMin(p1.x, p2.x);
    result.X.Max = ImMax(p1.x, p2.x);
    result.Y.Min = ImMin(p1.y, p2.y);
    result.Y.Max = ImMax(p1.y, p2.y);
    return result;
}

//-----------------------------------------------------------------------------
// STYLING
//-----------------------------------------------------------------------------

struct ImPlotStyleVarInfo {
    ImGuiDataType   Type;
    ImU32           Count;
    ImU32           Offset;
    void*           GetVarPtr(ImPlotStyle* style) const { return (void*)((unsigned char*)style + Offset); }
};

static const ImPlotStyleVarInfo GPlotStyleVarInfo[] =
{
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, LineWeight)         }, // ImPlotStyleVar_LineWeight
    { ImGuiDataType_S32,   1, (ImU32)IM_OFFSETOF(ImPlotStyle, Marker)             }, // ImPlotStyleVar_Marker
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, MarkerSize)         }, // ImPlotStyleVar_MarkerSize
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, MarkerWeight)       }, // ImPlotStyleVar_MarkerWeight
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, ErrorBarSize)       }, // ImPlotStyleVar_ErrorBarSize
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, ErrorBarWeight)     }, // ImPlotStyleVar_ErrorBarWeight
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, DigitalBitHeight)   }, // ImPlotStyleVar_DigitalBitHeight
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImPlotStyle, DigitalBitGap)      }  // ImPlotStyleVar_DigitalBitGap
};

static const ImPlotStyleVarInfo* GetPlotStyleVarInfo(ImPlotStyleVar idx)
{
    IM_ASSERT(idx >= 0 && idx < ImPlotStyleVar_COUNT);
    IM_ASSERT(IM_ARRAYSIZE(GPlotStyleVarInfo) == ImPlotStyleVar_COUNT);
    return &GPlotStyleVarInfo[idx];
}

ImPlotStyle& GetStyle() {
    return gp.Style;
}

void SetPalette(const ImVec4* colors, int num_colors) {
    gp.ColorMap.shrink(0);
    gp.ColorMap.reserve(num_colors);
    for (int i = 0; i < num_colors; ++i) {
        gp.ColorMap.push_back(colors[i]);
    }
}

/// Returns the next unused default plot color
void RestorePalette() {
    static ImVec4 default_colors[10] = {
        ImVec4((0.0F), (0.7490196228F), (1.0F), (1.0F)),                    // Blues::DeepSkyBlue,
        ImVec4((1.0F), (0.0F), (0.0F), (1.0F)),                             // Reds::Red,
        ImVec4((0.4980392158F), (1.0F), (0.0F), (1.0F)),                    // Greens::Chartreuse,
        ImVec4((1.0F), (1.0F), (0.0F), (1.0F)),                             // Yellows::Yellow,
        ImVec4((0.0F), (1.0F), (1.0F), (1.0F)),                             // Cyans::Cyan,
        ImVec4((1.0F), (0.6470588446F), (0.0F), (1.0F)),                    // Oranges::Orange,
        ImVec4((1.0F), (0.0F), (1.0F), (1.0F)),                             // Purples::Magenta,
        ImVec4((0.5411764979F), (0.1686274558F), (0.8862745166F), (1.0F)),  // Purples::BlueViolet,
        ImVec4((0.5f), (0.5f), (0.5f), (1.0F)),                             // Grays::Gray50,
        ImVec4((0.8235294223F), (0.7058823705F), (0.5490196347F), (1.0F))   // Browns::Tan
    };
    SetPalette(default_colors, 10);
}

void PushStyleColor(ImPlotCol idx, ImU32 col) {
    ImGuiColorMod backup;
    backup.Col = idx;
    backup.BackupValue = gp.Style.Colors[idx];
    gp.ColorModifiers.push_back(backup);
    gp.Style.Colors[idx] = ImGui::ColorConvertU32ToFloat4(col);
}

void PushStyleColor(ImPlotCol idx, const ImVec4& col) {
    ImGuiColorMod backup;
    backup.Col = idx;
    backup.BackupValue = gp.Style.Colors[idx];
    gp.ColorModifiers.push_back(backup);
    gp.Style.Colors[idx] = col;
}

void PopStyleColor(int count) {
    while (count > 0)
    {
        ImGuiColorMod& backup = gp.ColorModifiers.back();
        gp.Style.Colors[backup.Col] = backup.BackupValue;
        gp.ColorModifiers.pop_back();
        count--;
    }
}

void PushStyleVar(ImPlotStyleVar idx, float val) {
    const ImPlotStyleVarInfo* var_info = GetPlotStyleVarInfo(idx);
    if (var_info->Type == ImGuiDataType_Float && var_info->Count == 1) {
        float* pvar = (float*)var_info->GetVarPtr(&gp.Style);
        gp.StyleModifiers.push_back(ImGuiStyleMod(idx, *pvar));
        *pvar = val;
        return;
    }
    IM_ASSERT(0 && "Called PushStyleVar() float variant but variable is not a float!");
}

void PushStyleVar(ImPlotStyleVar idx, int val) {
    const ImPlotStyleVarInfo* var_info = GetPlotStyleVarInfo(idx);
    if (var_info->Type == ImGuiDataType_S32 && var_info->Count == 1) {
        int* pvar = (int*)var_info->GetVarPtr(&gp.Style);
        gp.StyleModifiers.push_back(ImGuiStyleMod(idx, *pvar));
        *pvar = val;
        return;
    }
    else if (var_info->Type == ImGuiDataType_Float && var_info->Count == 1) {
        float* pvar = (float*)var_info->GetVarPtr(&gp.Style);
        gp.StyleModifiers.push_back(ImGuiStyleMod(idx, *pvar));
        *pvar = (float)val;
        return;
    }
    IM_ASSERT(0 && "Called PushStyleVar() int variant but variable is not a int!");
}

void PopStyleVar(int count) {
    while (count > 0) {
        ImGuiStyleMod& backup = gp.StyleModifiers.back();
        const ImPlotStyleVarInfo* info = GetPlotStyleVarInfo(backup.VarIdx);
        void* data = info->GetVarPtr(&gp.Style);
        if (info->Type == ImGuiDataType_Float && info->Count == 1) {
            ((float*)data)[0] = backup.BackupFloat[0];
        }
        else if (info->Type == ImGuiDataType_Float && info->Count == 2) {
             ((float*)data)[0] = backup.BackupFloat[0];
             ((float*)data)[1] = backup.BackupFloat[1];
        }
        else if (info->Type == ImGuiDataType_S32 && info->Count == 1) {
            ((int*)data)[0] = backup.BackupInt[0];
        }
        gp.StyleModifiers.pop_back();
        count--;
    }
}

//-----------------------------------------------------------------------------
// RENDERING FUNCTIONS
//-----------------------------------------------------------------------------

#define SQRT_1_2 0.70710678118f
#define SQRT_3_2 0.86602540378f

inline void TransformMarker(ImVec2* points, int n, const ImVec2& c, float s) {
    for (int i = 0; i < n; ++i) {
        points[i].x = c.x + points[i].x * s;
        points[i].y = c.y + points[i].y * s;
    }
}

inline void MarkerGeneral(ImDrawList& DrawList, ImVec2* points, int n, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    TransformMarker(points, n, c, s);
    if (fill)
        DrawList.AddConvexPolyFilled(points, n, col_fill);
    if (outline && !(fill && col_outline == col_fill)) {
        for (int i = 0; i < n; ++i)
            DrawList.AddLine(points[i], points[(i+1)%n], col_outline, weight);
    }
}

inline void MarkerCircle(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[10] = {ImVec2(1.0f, 0.0f),
                         ImVec2(0.809017f, 0.58778524f),
                         ImVec2(0.30901697f, 0.95105654f),
                         ImVec2(-0.30901703f, 0.9510565f),
                         ImVec2(-0.80901706f, 0.5877852f),
                         ImVec2(-1.0f, 0.0f),
                         ImVec2(-0.80901694f, -0.58778536f),
                         ImVec2(-0.3090171f, -0.9510565f),
                         ImVec2(0.30901712f, -0.9510565f),
                         ImVec2(0.80901694f, -0.5877853f)};
    MarkerGeneral(DrawList, marker, 10, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerDiamond(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[4] = {ImVec2(1, 0), ImVec2(0, -1), ImVec2(-1, 0), ImVec2(0, 1)};
    MarkerGeneral(DrawList, marker, 4, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerSquare(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[4] = {ImVec2(SQRT_1_2,SQRT_1_2),ImVec2(SQRT_1_2,-SQRT_1_2),ImVec2(-SQRT_1_2,-SQRT_1_2),ImVec2(-SQRT_1_2,SQRT_1_2)};
    MarkerGeneral(DrawList, marker, 4, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerUp(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[3] = {ImVec2(SQRT_3_2,0.5f),ImVec2(0,-1),ImVec2(-SQRT_3_2,0.5f)};
    MarkerGeneral(DrawList, marker, 3, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerDown(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[3] = {ImVec2(SQRT_3_2,-0.5f),ImVec2(0,1),ImVec2(-SQRT_3_2,-0.5f)};
    MarkerGeneral(DrawList, marker, 3, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerLeft(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[3] = {ImVec2(-1,0), ImVec2(0.5, SQRT_3_2), ImVec2(0.5, -SQRT_3_2)};
    MarkerGeneral(DrawList, marker, 3, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerRight(ImDrawList& DrawList, const ImVec2& c, float s, bool outline, ImU32 col_outline, bool fill, ImU32 col_fill, float weight) {
    ImVec2 marker[3] = {ImVec2(1,0), ImVec2(-0.5, SQRT_3_2), ImVec2(-0.5, -SQRT_3_2)};
    MarkerGeneral(DrawList, marker, 3, c, s, outline, col_outline, fill, col_fill, weight);
}

inline void MarkerAsterisk(ImDrawList& DrawList, const ImVec2& c, float s, bool /*outline*/, ImU32 col_outline, bool /*fill*/, ImU32 /*col_fill*/, float weight) {
    ImVec2 marker[6] = {{SQRT_3_2, 0.5f}, {0, -1}, {-SQRT_3_2, 0.5f}, {SQRT_3_2, -0.5f}, {0, 1},  {-SQRT_3_2, -0.5f}};
    TransformMarker(marker, 6, c, s);
    DrawList.AddLine(marker[0], marker[5], col_outline, weight);
    DrawList.AddLine(marker[1], marker[4], col_outline, weight);
    DrawList.AddLine(marker[2], marker[3], col_outline, weight);
}

inline void MarkerPlus(ImDrawList& DrawList, const ImVec2& c, float s, bool /*outline*/, ImU32 col_outline, bool /*fill*/, ImU32 /*col_fill*/, float weight) {
    ImVec2 marker[4] = {{1, 0}, {0, -1}, {-1, 0}, {0, 1}};
    TransformMarker(marker, 4, c, s);
    DrawList.AddLine(marker[0], marker[2], col_outline, weight);
    DrawList.AddLine(marker[1], marker[3], col_outline, weight);
}

inline void MarkerCross(ImDrawList& DrawList, const ImVec2& c, float s, bool /*outline*/, ImU32 col_outline, bool /*fill*/, ImU32 /*col_fill*/, float weight) {
    ImVec2 marker[4] = {{SQRT_1_2,SQRT_1_2},{SQRT_1_2,-SQRT_1_2},{-SQRT_1_2,-SQRT_1_2},{-SQRT_1_2,SQRT_1_2}};
    TransformMarker(marker, 4, c, s);
    DrawList.AddLine(marker[0], marker[2], col_outline, weight);
    DrawList.AddLine(marker[1], marker[3], col_outline, weight);
}

template <typename Transformer, typename Getter>
inline void RenderMarkers(Transformer transformer, ImDrawList& DrawList, Getter getter, int count, int offset, bool rend_mk_line, ImU32 col_mk_line, bool rend_mk_fill, ImU32 col_mk_fill, bool cull) {
int idx = offset;
    for (int i = 0; i < count; ++i) {
        ImVec2 c;
        c = transformer(getter(idx));
        idx = (idx + 1) % count;
        if (!cull || gp.BB_Grid.Contains(c)) {
            // TODO: Optimize the loop and if statements, this is atrocious
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Circle))
                MarkerCircle(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Square))
                MarkerSquare(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Diamond))
                MarkerDiamond(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Up))
                MarkerUp(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Down))
                MarkerDown(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Left))
                MarkerLeft(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Right))
                MarkerRight(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Cross))
                MarkerCross(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Plus))
                MarkerPlus(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
            if (HasFlag(gp.Style.Marker, ImPlotMarker_Asterisk))
                MarkerAsterisk(DrawList, c, gp.Style.MarkerSize, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, gp.Style.MarkerWeight);
        }
    }
}

inline void RenderLine(ImDrawList& DrawList, const ImVec2& p1, const ImVec2& p2, float line_weight, ImU32 col_line, ImVec2 uv) {
    // http://assemblyrequired.crashworks.org/timing-square-root/
    float dx = p2.x - p1.x;
    float dy = p2.y - p1.y;
    IM_NORMALIZE2F_OVER_ZERO(dx, dy);
    dx *= (line_weight * 0.5f);
    dy *= (line_weight * 0.5f);
    DrawList._VtxWritePtr[0].pos.x = p1.x + dy;
    DrawList._VtxWritePtr[0].pos.y = p1.y - dx;
    DrawList._VtxWritePtr[0].uv    = uv;
    DrawList._VtxWritePtr[0].col   = col_line;
    DrawList._VtxWritePtr[1].pos.x = p2.x + dy;
    DrawList._VtxWritePtr[1].pos.y = p2.y - dx;
    DrawList._VtxWritePtr[1].uv    = uv;
    DrawList._VtxWritePtr[1].col   = col_line;
    DrawList._VtxWritePtr[2].pos.x = p2.x - dy;
    DrawList._VtxWritePtr[2].pos.y = p2.y + dx;
    DrawList._VtxWritePtr[2].uv    = uv;
    DrawList._VtxWritePtr[2].col   = col_line;
    DrawList._VtxWritePtr[3].pos.x = p1.x - dy;
    DrawList._VtxWritePtr[3].pos.y = p1.y + dx;
    DrawList._VtxWritePtr[3].uv    = uv;
    DrawList._VtxWritePtr[3].col   = col_line;
    DrawList._VtxWritePtr += 4;
    DrawList._IdxWritePtr[0] = (ImDrawIdx)(DrawList._VtxCurrentIdx);
    DrawList._IdxWritePtr[1] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 1);
    DrawList._IdxWritePtr[2] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 2);
    DrawList._IdxWritePtr[3] = (ImDrawIdx)(DrawList._VtxCurrentIdx);
    DrawList._IdxWritePtr[4] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 2);
    DrawList._IdxWritePtr[5] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 3);
    DrawList._IdxWritePtr += 6;
    DrawList._VtxCurrentIdx += 4;
}

inline void RenderLineAA(ImDrawList& DrawList, const ImVec2& p1, const ImVec2& p2, float line_weight, ImU32 col_line) {
    DrawList.AddLine(p1, p2, col_line, line_weight);
}

template <typename Transformer, typename Getter>
inline void RenderLineStrip(Transformer transformer, ImDrawList& DrawList, Getter getter, int count, int offset, float line_weight, ImU32 col_line, bool cull) {
// render line segments
   offset %= count;
   if (offset < 0) offset += count; // shift negative offset to positive range
   int i_start = offset + 1;
   if (i_start >= count ) i_start -= count;
   int i_end = offset + count;
   if (i_end >= count) i_end -= count;
   
   const int    segments  = count - 1;
   ImVec2 p1 = transformer(getter(offset));    
   if (HasFlag(gp.CurrentPlot->Flags, ImPlotFlags_AntiAliased)) {
      for (int i1 = i_start; i1 != i_end; i1 = i1 + 1 < count ? i1 + 1 : i1 + 1 - count) {
         ImVec2 p2 = transformer(getter(i1));

         if (!cull || gp.BB_Grid.Overlaps(ImRect(ImMin(p1,p2), ImMax(p1,p2))))
               RenderLineAA(DrawList, p1, p2, line_weight, col_line);
         p1 = p2;            
      }
   }
   else {
      const ImVec2 uv = DrawList._Data->TexUvWhitePixel;
      DrawList.PrimReserve(segments * 6, segments * 4);
      int segments_culled = 0;
      for (int i1 = i_start; i1 != i_end; i1 = i1 + 1 < count ? i1 + 1 : i1 + 1 - count) {
         ImVec2 p2 = transformer(getter(i1));           

         if (!cull || gp.BB_Grid.Overlaps(ImRect(ImMin(p1, p2), ImMax(p1, p2))))
            RenderLine(DrawList, p1, p2, line_weight, col_line, uv);
         else
            segments_culled++;
         p1 = p2;
      }
      if (segments_culled > 0)
         DrawList.PrimUnreserve(segments_culled * 6, segments_culled * 4);
   }
}

//-----------------------------------------------------------------------------
// DATA GETTERS
//-----------------------------------------------------------------------------

inline float StrideIndex(const float* data, int idx, int stride) {
    return *(const float*)(const void*)((const unsigned char*)data + (size_t)idx * stride);
}

struct GetterYs {
    GetterYs(const float* ys, int stride) {  Ys = ys; Stride = stride; }
    const float* Ys;
    int Stride;
    inline ImVec2 operator()(int idx) {
        return ImVec2((float)idx, StrideIndex(Ys, idx, Stride));
    }
};

struct Getter2D {
    Getter2D(const float* xs, const float* ys, int stride) { Xs = xs; Ys = ys; Stride = stride; }
    const float* Xs;
    const float* Ys;
    int Stride;
    inline ImVec2 operator()(int idx) {
        return ImVec2(StrideIndex(Xs, idx, Stride), StrideIndex(Ys, idx, Stride));
    }
};

struct GetterImVec2 {
    GetterImVec2(const ImVec2* data) { Data = data; }
    inline ImVec2 operator()(int idx) { return Data[idx]; }
    const ImVec2* Data;
};

struct GetterFuncPtrImVec2 {
    GetterFuncPtrImVec2(ImVec2 (*g)(void* data, int idx), void* d) { getter = g; data = d;}
    ImVec2 operator()(int idx) { return getter(data, idx); }
    ImVec2 (*getter)(void* data, int idx);
    void* data;
};

struct GetterFuncPtrImVec4 {
    GetterFuncPtrImVec4(ImVec4 (*g)(void* data, int idx), void* d) { getter = g; data = d;}
    ImVec4 operator()(int idx) { return getter(data, idx); }
    ImVec4 (*getter)(void* data, int idx);
    void* data;
};

//-----------------------------------------------------------------------------
// PLOT
//-----------------------------------------------------------------------------

template <typename Getter>
inline void PlotEx(const char* label_id, Getter getter, int count, int offset)
{
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "Plot() Needs to be called between BeginPlot() and EndPlot()!");

    ImPlotState* plot = gp.CurrentPlot;
    const int y_axis = plot->CurrentYAxis;
    ImPlotItem* item = RegisterItem(label_id);
    if (!item->Show)
        return;

    ImDrawList & DrawList = *ImGui::GetWindowDrawList();

    const bool rend_line    = gp.Style.Colors[ImPlotCol_Line].w != 0          && gp.Style.LineWeight > 0;
    const bool rend_mk_line = gp.Style.Colors[ImPlotCol_MarkerOutline].w != 0 && gp.Style.MarkerWeight > 0;
    const bool rend_mk_fill = gp.Style.Colors[ImPlotCol_MarkerFill].w != 0;

    ImU32 col_line    = gp.Style.Colors[ImPlotCol_Line].w == -1 ? ImGui::GetColorU32(item->Color) : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Line]);
    ImU32 col_mk_line = gp.Style.Colors[ImPlotCol_MarkerOutline].w == -1 ? col_line        : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_MarkerOutline]);
    ImU32 col_mk_fill = gp.Style.Colors[ImPlotCol_MarkerFill].w == -1 ?    col_line        : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_MarkerFill]);

    const float line_weight = item->Highlight ? gp.Style.LineWeight * 2 : gp.Style.LineWeight;

    if (gp.Style.Colors[ImPlotCol_Line].w != -1)
        item->Color = gp.Style.Colors[ImPlotCol_Line];

    bool cull = HasFlag(plot->Flags, ImPlotFlags_CullData);

    // find data extents
    if (gp.FitThisFrame) {
        for (int i = 0; i < count; ++i) {
            ImVec2 p = getter(i);
            FitPoint(p);
        }
    }
    PushPlotClipRect();
    if (count > 1 && rend_line) {
        if (HasFlag(plot->XAxis.Flags, ImPlotAxisFlags_LogScale) && HasFlag(plot->YAxis[y_axis].Flags, ImPlotAxisFlags_LogScale))
            RenderLineStrip(Plt2PixLogLog(y_axis), DrawList, getter, count, offset, line_weight, col_line, cull);
        else if (HasFlag(plot->XAxis.Flags, ImPlotAxisFlags_LogScale))
            RenderLineStrip(Plt2PixLogLin(y_axis), DrawList, getter, count, offset, line_weight, col_line, cull);
        else if (HasFlag(plot->YAxis[y_axis].Flags, ImPlotAxisFlags_LogScale))
            RenderLineStrip(Plt2PixLinLog(y_axis), DrawList, getter, count, offset, line_weight, col_line, cull);
        else
            RenderLineStrip(Plt2PixLinLin(y_axis), DrawList, getter, count, offset, line_weight, col_line, cull);
    }
    // render markers
    if (gp.Style.Marker != ImPlotMarker_None) {
        if (HasFlag(plot->XAxis.Flags, ImPlotAxisFlags_LogScale) && HasFlag(plot->YAxis[y_axis].Flags, ImPlotAxisFlags_LogScale))
            RenderMarkers(Plt2PixLogLog(y_axis), DrawList, getter, count, offset, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, cull);
        else if (HasFlag(plot->XAxis.Flags, ImPlotAxisFlags_LogScale))
            RenderMarkers(Plt2PixLogLin(y_axis), DrawList, getter, count, offset, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, cull);
        else if (HasFlag(plot->YAxis[y_axis].Flags, ImPlotAxisFlags_LogScale))
            RenderMarkers(Plt2PixLinLog(y_axis), DrawList, getter, count, offset, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, cull);
        else
            RenderMarkers(Plt2PixLinLin(y_axis), DrawList, getter, count, offset, rend_mk_line, col_mk_line, rend_mk_fill, col_mk_fill, cull);
    }
    PopPlotClipRect();
}

void PlotLine(const char* label_id, const float* values, int count, int offset, int stride) {
    GetterYs getter(values,stride);
    PlotEx(label_id, getter, count, offset);
}

void PlotLine(const char* label_id, const float* xs, const float* ys, int count, int offset, int stride) {
    Getter2D getter(xs,ys,stride);
    return PlotEx(label_id, getter, count, offset);
}

void PlotLine(const char* label_id, const ImVec2* data, int count, int offset) {
    GetterImVec2 getter(data);
    return PlotEx(label_id, getter, count, offset);
}

void PlotLine(const char* label_id, ImVec2 (*getter_func)(void* data, int idx), void* data, int count, int offset) {
    GetterFuncPtrImVec2 getter(getter_func,data);
    return PlotEx(label_id, getter, count, offset);
}

//-----------------------------------------------------------------------------
// PLOT SCATTER
//-----------------------------------------------------------------------------

void PlotScatter(const char* label_id, const float* values, int count, int offset, int stride) {
    int pops = 1;
    PushStyleVar(ImPlotStyleVar_LineWeight, 0);
    if (GetStyle().Marker == ImPlotMarker_None) {
        PushStyleVar(ImPlotStyleVar_Marker, ImPlotMarker_Circle);
        pops++;
    }
    PlotLine(label_id, values, count, offset, stride);
    PopStyleVar(pops);
}

void PlotScatter(const char* label_id, const float* xs, const float* ys, int count, int offset, int stride) {
    int pops = 1;
    PushStyleVar(ImPlotStyleVar_LineWeight, 0);
    if (GetStyle().Marker == ImPlotMarker_None) {
        PushStyleVar(ImPlotStyleVar_Marker, ImPlotMarker_Circle);
        pops++;
    }
    PlotLine(label_id, xs, ys, count, offset, stride);
    PopStyleVar(pops);
}

void PlotScatter(const char* label_id, const ImVec2* data, int count, int offset) {
        int pops = 1;
    PushStyleVar(ImPlotStyleVar_LineWeight, 0);
    if (GetStyle().Marker == ImPlotMarker_None) {
        PushStyleVar(ImPlotStyleVar_Marker, ImPlotMarker_Circle);
        pops++;
    }
    PlotLine(label_id, data, count, offset);
    PopStyleVar(pops);
}

void PlotScatter(const char* label_id, ImVec2 (*getter)(void* data, int idx), void* data, int count, int offset) {
    int pops = 1;
    PushStyleVar(ImPlotStyleVar_LineWeight, 0);
    if (GetStyle().Marker == ImPlotMarker_None) {
        PushStyleVar(ImPlotStyleVar_Marker, ImPlotMarker_Circle);
        pops++;
    }
    PlotLine(label_id, getter, data, count, offset);
    PopStyleVar(pops);
}

//-----------------------------------------------------------------------------
// PLOT BAR
//-----------------------------------------------------------------------------

struct GetterBarV {
    const float* Ys; float XShift; int Stride;
    GetterBarV(const float* ys, float xshift, int stride) { Ys = ys; XShift = xshift; Stride = stride; }
    inline ImVec2 operator()(int idx) { return ImVec2((float)idx + XShift, StrideIndex(Ys, idx, Stride)); }
};

struct GetterBarH {
    const float* Xs; float YShift; int Stride;
    GetterBarH(const float* xs, float yshift, int stride) { Xs = xs; YShift = yshift; Stride = stride; }
    inline ImVec2 operator()(int idx) { return ImVec2(StrideIndex(Xs, idx, Stride), (float)idx + YShift); }
};


template <typename Getter>
void PlotBarEx(const char* label_id, Getter getter, int count, float width, int offset) {

    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "Bar() Needs to be called between BeginPlot() and EndPlot()!");

    ImPlotItem* item = RegisterItem(label_id);
    if (!item->Show)
        return;

    ImDrawList & DrawList = *ImGui::GetWindowDrawList();

    bool rend_line = gp.Style.Colors[ImPlotCol_Line].w != 0 && gp.Style.LineWeight > 0;
    bool rend_fill = gp.Style.Colors[ImPlotCol_Fill].w != 0;

    ImU32 col_line = gp.Style.Colors[ImPlotCol_Line].w == -1 ? ImGui::GetColorU32(item->Color) : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Line]);
    ImU32 col_fill = gp.Style.Colors[ImPlotCol_Fill].w == -1 ? col_line                 : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Fill]);

    if (rend_fill && col_line == col_fill)
        rend_line = false;

    if (gp.Style.Colors[ImPlotCol_Line].w != -1)
        item->Color = gp.Style.Colors[ImPlotCol_Line];

    PushPlotClipRect();

    float half_width = width * 0.5f;

    // find data extents
    if (gp.FitThisFrame) {
        for (int i = 0; i < count; ++i) {
            ImVec2 p = getter(i);
            FitPoint(ImVec2(p.x - half_width, p.y));
            FitPoint(ImVec2(p.x + half_width, 0));
        }
    }

    int idx = offset;
    for (int i = 0; i < count; ++i) {
        ImVec2 p;
        p = getter(idx);
        idx = (idx + 1) % count;
        if (p.y == 0)
            continue;
        ImVec2 a = PlotToPixels(p.x - half_width, p.y);
        ImVec2 b = PlotToPixels(p.x + half_width, 0);
        if (rend_fill)
            DrawList.AddRectFilled(a, b, col_fill);
        if (rend_line)
            DrawList.AddRect(a, b, col_line);
    }
    PopPlotClipRect();
}

void PlotBar(const char* label_id, const float* values, int count, float width, float shift, int offset, int stride) {
    GetterBarV getter(values,shift,stride);
    PlotBarEx(label_id, getter, count, width, offset);
}

void PlotBar(const char* label_id, const float* xs, const float* ys, int count, float width, int offset, int stride) {
    Getter2D getter(xs,ys,stride);
    PlotBarEx(label_id, getter, count, width, offset);
}

void PlotBar(const char* label_id, ImVec2 (*getter_func)(void* data, int idx), void* data, int count, float width, int offset) {
    GetterFuncPtrImVec2 getter(getter_func, data);
    PlotBarEx(label_id, getter, count, width, offset);
}

//-----------------------------------------------------------------------------

template <typename Getter>
void PlotBarHEx(const char* label_id, Getter getter, int count, float height,  int offset) {

    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "BarH() Needs to be called between BeginPlot() and EndPlot()!");

    ImPlotItem* item = RegisterItem(label_id);
    if (!item->Show)
        return;

    ImDrawList & DrawList = *ImGui::GetWindowDrawList();

    bool rend_line = gp.Style.Colors[ImPlotCol_Line].w != 0 && gp.Style.LineWeight > 0;
    bool rend_fill = gp.Style.Colors[ImPlotCol_Fill].w != 0;

    ImU32 col_line = gp.Style.Colors[ImPlotCol_Line].w == -1 ? ImGui::GetColorU32(item->Color) : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Line]);
    ImU32 col_fill = gp.Style.Colors[ImPlotCol_Fill].w == -1 ? col_line                 : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_Fill]);

    if (rend_fill && col_line == col_fill)
        rend_line = false;

    if (gp.Style.Colors[ImPlotCol_Line].w != -1)
        item->Color = gp.Style.Colors[ImPlotCol_Line];

    PushPlotClipRect();

    float half_height = height * 0.5f;

    // find data extents
    if (gp.FitThisFrame) {
        for (int i = 0; i < count; ++i) {
            ImVec2 p = getter(i);
            FitPoint(ImVec2(0, p.y - half_height));
            FitPoint(ImVec2(p.x, p.y + half_height));
        }
    }

    int idx = offset;
    for (int i = 0; i < count; ++i) {
        ImVec2 p;
        p = getter(idx);
        idx = (idx + 1) % count;
        if (p.x == 0)
            continue;
        ImVec2 a = PlotToPixels(0, p.y - half_height);
        ImVec2 b = PlotToPixels(p.x, p.y + half_height);
        if (rend_fill)
            DrawList.AddRectFilled(a, b, col_fill);
        if (rend_line)
            DrawList.AddRect(a, b, col_line);
    }
    PopPlotClipRect();
}

void PlotBarH(const char* label_id, const float* values, int count, float height, float shift, int offset, int stride) {
    GetterBarH getter(values,shift,stride);
    PlotBarHEx(label_id, getter, count, height, offset);
}

void PlotBarH(const char* label_id, const float* xs, const float* ys, int count, float height,  int offset, int stride) {
    Getter2D getter(xs,ys,stride);
    PlotBarHEx(label_id, getter, count, height, offset);
}

void PlotBarH(const char* label_id, ImVec2 (*getter_func)(void* data, int idx), void* data, int count, float height,  int offset) {
    GetterFuncPtrImVec2 getter(getter_func, data);
    PlotBarHEx(label_id, getter, count, height, offset);
}

//-----------------------------------------------------------------------------
// PLOT ERROR BARS
//-----------------------------------------------------------------------------

struct GetterError {
    const float* Xs; const float* Ys; const float* Neg; const float* Pos; int Stride;
    GetterError(const float* xs, const float* ys, const float* neg, const float* pos, int stride) {
        Xs = xs; Ys = ys; Neg = neg; Pos = pos; Stride = stride;
    }
    ImVec4 operator()(int idx) {
        return ImVec4(StrideIndex(Xs,  idx, Stride),
                      StrideIndex(Ys,  idx, Stride),
                      StrideIndex(Neg, idx, Stride),
                      StrideIndex(Pos, idx, Stride));
    }
};

template <typename Getter>
void PlotErrorBarsEx(const char* label_id, Getter getter, int count, int offset) {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "ErrorBars() Needs to be called between BeginPlot() and EndPlot()!");

    ImGuiID id = ImGui::GetID(label_id);
    ImPlotItem* item = gp.CurrentPlot->Items.GetByKey(id);
    if (item != NULL && item->Show == false)
        return;

    ImDrawList & DrawList = *ImGui::GetWindowDrawList();

    PushPlotClipRect();

    const ImU32 col = gp.Style.Colors[ImPlotCol_ErrorBar].w == -1 ? ImGui::GetColorU32(ImGuiCol_Text) : ImGui::GetColorU32(gp.Style.Colors[ImPlotCol_ErrorBar]);
    const bool rend_whisker = gp.Style.ErrorBarSize > 0;

    const float half_whisker = gp.Style.ErrorBarSize * 0.5f;

    // find data extents
    if (gp.FitThisFrame) {
        for (int i = 0; i < count; ++i) {
            ImVec4 e = getter(i);
            FitPoint(ImVec2(e.x , e.y - e.z));
            FitPoint(ImVec2(e.x , e.y + e.w ));
        }
    }

    int idx = offset;
    for (int i = 0; i < count; ++i) {
        ImVec4 e;
        e = getter(idx);
        idx = (idx + 1) % count;
        ImVec2 p1 = PlotToPixels(e.x, e.y - e.z);
        ImVec2 p2 = PlotToPixels(e.x, e.y + e.w);
        DrawList.AddLine(p1,p2,col, gp.Style.ErrorBarWeight);
        if (rend_whisker) {
            DrawList.AddLine(p1 - ImVec2(half_whisker, 0), p1 + ImVec2(half_whisker, 0), col, gp.Style.ErrorBarWeight);
            DrawList.AddLine(p2 - ImVec2(half_whisker, 0), p2 + ImVec2(half_whisker, 0), col, gp.Style.ErrorBarWeight);
        }
    }
    PopPlotClipRect();
}

void PlotErrorBars(const char* label_id, const float* xs, const float* ys, const float* err, int count, int offset, int stride) {
    GetterError getter(xs, ys, err, err, stride);
    PlotErrorBarsEx(label_id, getter, count, offset);
}

void PlotErrorBars(const char* label_id, const float* xs, const float* ys, const float* neg, const float* pos, int count, int offset, int stride) {
    GetterError getter(xs, ys, neg, pos, stride);
    PlotErrorBarsEx(label_id, getter, count, offset);
}

void PlotErrorBars(const char* label_id, ImVec4 (*getter_func)(void* data, int idx), void* data, int count, int offset) {
    GetterFuncPtrImVec4 getter(getter_func, data);
    PlotErrorBarsEx(label_id, getter, count, offset);
}

//-----------------------------------------------------------------------------
// PLOT MISC
//-----------------------------------------------------------------------------

inline void DrawPieSlice(ImDrawList& DrawList, const ImVec2& center, float radius, float a0, float a1, ImU32 col) {
    static const float resolution = 50 / (2 * IM_PI);
    static ImVec2 buffer[50];
    buffer[0] = PlotToPixels(center);
    int n = ImMax(3, (int)((a1 - a0) * resolution));
    float da = (a1 - a0) / (n - 1);
    for (int i = 0; i < n; ++i) {
        float a = a0 + i * da;
        buffer[i + 1] = PlotToPixels(center.x + radius * cos(a), center.y + radius * sin(a));
    }
    DrawList.AddConvexPolyFilled(buffer, n + 1, col);
}


void PlotPieChart(const char** label_ids, float* values, int count, const ImVec2& center, float radius, bool show_percents, float angle0) {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PieChart() Needs to be called between BeginPlot() and EndPlot()!");
    ImDrawList & DrawList = *ImGui::GetWindowDrawList();

    float sum = 0;
    for (int i = 0; i < count; ++i)
        sum += values[i];

    const bool normalize = sum > 1.0f;

    PushPlotClipRect();
    float a0 = angle0 * 2 * IM_PI / 360.0f;
    float a1 = angle0 * 2 * IM_PI / 360.0f;
    for (int i = 0; i < count; ++i) {
        ImPlotItem* item = RegisterItem(label_ids[i]);
        ImU32 col = ImGui::GetColorU32(item->Color);
        float percent = normalize ? values[i] / sum : values[i];
        a1 = a0 + 2 * IM_PI * percent;
        if (item->Show) {
            if (percent < 0.5) {
                DrawPieSlice(DrawList, center, radius, a0, a1, col);
            }
            else  {
                DrawPieSlice(DrawList, center, radius, a0, a0 + (a1 - a0) * 0.5f, col);
                DrawPieSlice(DrawList, center, radius, a0 + (a1 - a0) * 0.5f, a1, col);
            }
            if (show_percents) {
                char buffer[8];
                sprintf(buffer, "%.0f%%", percent * 100);
                ImVec2 size = ImGui::CalcTextSize(buffer);
                float angle = a0 + (a1 - a0) * 0.5f;
                ImVec2 pos = PlotToPixels(center.x + 0.5f * radius * cos(angle), center.y + 0.5f * radius * sin(angle));
                DrawList.AddText(pos - size * 0.5f + ImVec2(1,1), IM_COL32(0,0,0,255), buffer);
                DrawList.AddText(pos - size * 0.5f, IM_COL32(255,255,255,255), buffer);
            }
        }
        a0 = a1;
    }
    PopPlotClipRect();
}

void PlotText(const char* text, float x, float y, bool vertical, const ImVec2& pixel_offset) {
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "Text() Needs to be called between BeginPlot() and EndPlot()!");
    ImDrawList & DrawList = *ImGui::GetWindowDrawList();
    PushPlotClipRect();
    ImVec2 pos = PlotToPixels(ImVec2(x,y)) + pixel_offset;
    if (vertical)
        AddTextVertical(&DrawList, text, pos, gp.Col_Txt);
    else
        DrawList.AddText(pos, gp.Col_Txt, text);
    PopPlotClipRect();
}

template <typename Getter>
inline void PlotDigitalEx(const char* label_id, Getter getter, int count, int offset)
{
    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "Plot() Needs to be called between BeginPlot() and EndPlot()!");

    ImPlotItem* item = RegisterItem(label_id);
    if (!item->Show)
        return;

    ImDrawList & DrawList = *ImGui::GetWindowDrawList();

    const bool rend_line = gp.Style.Colors[ImPlotCol_Line].w != 0 && gp.Style.LineWeight > 0;

    if (gp.Style.Colors[ImPlotCol_Line].w != -1)
        item->Color = gp.Style.Colors[ImPlotCol_Line];
    
  // find data extents
    if (gp.FitThisFrame) {
        for (int i = 0; i < count; ++i) {
            ImVec2 p = getter(i);
            FitPoint(ImVec2(p.x, 0));
        }
    }

    ImGui::PushClipRect(gp.BB_Grid.Min, gp.BB_Grid.Max, true);
    bool cull = HasFlag(gp.CurrentPlot->Flags, ImPlotFlags_CullData);

    const float line_weight = item->Highlight ? gp.Style.LineWeight * 2 : gp.Style.LineWeight;

    const int ax = gp.CurrentPlot->CurrentYAxis;

    // render digital signals as "pixel bases" rectangles
    if (count > 1 && rend_line) {
        //
        const float mx = (gp.PixelRange[ax].Max.x - gp.PixelRange[ax].Min.x) / gp.CurrentPlot->XAxis.Range.Size();
        const int    segments  = count - 1;
        int    i1 = offset;
        int pixYMax = 0;
        for (int s = 0; s < segments; ++s) {
            const int i2 = (i1 + 1) % count;
            ImVec2 itemData1 = getter(i1);
            ImVec2 itemData2 = getter(i2);
            i1 = i2;
            int pixY_0 = (int)(line_weight);
            float pixY_1_float = gp.Style.DigitalBitHeight * ImMax(0.0f, itemData1.y);
            int pixY_1 = (int)(pixY_1_float); //allow only positive values
            int pixY_chPosOffset = (int)(ImMax(gp.Style.DigitalBitHeight, pixY_1_float) + gp.Style.DigitalBitGap);
            pixYMax = ImMax(pixYMax, pixY_chPosOffset);
            ImVec2 pMin, pMax;
            pMin.x = gp.PixelRange[ax].Min.x + mx * (itemData1.x - gp.CurrentPlot->XAxis.Range.Min);
            pMax.x = gp.PixelRange[ax].Min.x + mx * (itemData2.x - gp.CurrentPlot->XAxis.Range.Min);
            int pixY_Offset = 20;//20 pixel from bottom due to mouse cursor label
            pMin.y = (gp.PixelRange[ax].Min.y) + ((-gp.DigitalPlotOffset)                   - pixY_Offset);
            pMax.y = (gp.PixelRange[ax].Min.y) + ((-gp.DigitalPlotOffset) - pixY_0 - pixY_1 - pixY_Offset);
            //plot only one rectangle for same digital state
            while (((s+2) < segments) && (itemData1.y == itemData2.y)) {
                const int i3 = (i1 + 1) % count;
                itemData2 = getter(i3);
                pMax.x = gp.PixelRange[ax].Min.x + mx * (itemData2.x - gp.CurrentPlot->XAxis.Range.Min);
                i1 = i3;
                s++;
            }
            //do not extend plot outside plot range
            if (pMin.x < gp.PixelRange[ax].Min.x) pMin.x = gp.PixelRange[ax].Min.x;
            if (pMax.x < gp.PixelRange[ax].Min.x) pMax.x = gp.PixelRange[ax].Min.x;
            if (pMin.x > gp.PixelRange[ax].Max.x) pMin.x = gp.PixelRange[ax].Max.x;
            if (pMax.x > gp.PixelRange[ax].Max.x) pMax.x = gp.PixelRange[ax].Max.x;
            //plot a rectangle that extends up to x2 with y1 height
            if ((pMax.x > pMin.x) && (!cull || gp.BB_Grid.Contains(pMin) || gp.BB_Grid.Contains(pMax))) {
                ImVec4 colAlpha = item->Color;
                colAlpha.w = item->Highlight ? 1.0f : 0.9f;
                DrawList.AddRectFilled(pMin, pMax, ImGui::GetColorU32(colAlpha));
            }
        }
        gp.DigitalPlotItemCnt++;
        gp.DigitalPlotOffset += pixYMax;
    }

    ImGui::PopClipRect();
}

void PlotDigital(const char* label_id, const float* xs, const float* ys, int count, int offset, int stride) {
    Getter2D getter(xs,ys,stride);
    return PlotDigitalEx(label_id, getter, count, offset);
}

void PlotDigital(const char* label_id, ImVec2 (*getter_func)(void* data, int idx), void* data, int count, int offset) {
    GetterFuncPtrImVec2 getter(getter_func,data);
    return PlotDigitalEx(label_id, getter, count, offset);
}

}  // namespace ImPlot