gwm17/implot
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working prototype for shaded plots

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This commit is contained in:
Evan Pezent 2020-06-12 22:02:43 -05:00
parent 218e7bc5f1
commit 61bc4d1426
3 changed files with 145 additions and 7 deletions
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127
implot.cpp
View File

@ -318,6 +318,7 @@ struct ImPlotAxisColor {
struct ImPlotItem {
ImPlotItem() {
Show = true;
SeenThisFrame = false;
Highlight = false;
Color = NextColor();
NameOffset = -1;
@ -325,6 +326,7 @@ struct ImPlotItem {
}
~ImPlotItem() { ID = 0; }
bool Show;
bool SeenThisFrame;
bool Highlight;
ImVec4 Color;
int NameOffset;
@ -637,6 +639,9 @@ struct TransformerLogLog {
ImPlotItem* RegisterItem(const char* label_id) {
ImGuiID id = ImGui::GetID(label_id);
ImPlotItem* item = gp.CurrentPlot->Items.GetOrAddByKey(id);
if (item->SeenThisFrame)
return item;
item->SeenThisFrame = true;
int idx = gp.CurrentPlot->Items.GetIndex(item);
item->ID = id;
gp.LegendIndices.push_back(idx);
@ -1807,6 +1812,11 @@ void EndPlot() {
}
// CLEANUP ----------------------------------------------------------------
// reset the plot items for the next frame
for (int i = 0; i < gp.CurrentPlot->Items.GetSize(); ++i) {
gp.CurrentPlot->Items.GetByIndex(i)->SeenThisFrame = false;
}
// Pop ImGui::PushID at the end of BeginPlot
ImGui::PopID();
// Reset context for next plot
@ -1958,6 +1968,7 @@ static const ImPlotStyleVarInfo GPlotStyleVarInfo[] =
{ 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, FillAlpha) }, // ImPlotStyleVar_FillAlpha
{ 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
@ -2231,14 +2242,17 @@ struct LineRenderer {
template <typename Getter, typename Transformer>
struct LineFillRenderer {
LineFillRenderer(Getter _getter, Transformer _transformer, ImU32 col, float zero) {
getter = _getter;
transformer = _transformer;
Col = col;
Zero = zero;
LineFillRenderer(Getter _getter, Transformer _transformer, ImU32 col, float zero) :
getter(_getter),
transformer(_transformer),
Col(col),
Zero(zero)
{
Prims = getter.Count - 1;
p1 = transformer(getter(0));
}
inline void operator()(ImDrawList& DrawList, ImVec2 uv) {
inline bool operator()(ImDrawList& DrawList, ImVec2 uv, int prim) {
ImVec2 p2 = transformer(getter(prim + 1));
const int crosses_zero = (p1.y > Zero && p2.y < Zero) || (p1.y < Zero && p2.y > Zero); // could do y*y < 0 earlier on
const float xmid = p1.x + (p2.x - p1.x) / (p2.y-p1.y) * (Zero - p1.y);
DrawList._VtxWritePtr[0].pos = p1;
@ -2265,7 +2279,11 @@ struct LineFillRenderer {
DrawList._IdxWritePtr[5] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 4);
DrawList._IdxWritePtr += 6;
DrawList._VtxCurrentIdx += 5;
p1 = p2;
return true;
}
Getter getter;
Transformer transformer;
int Prims;
ImU32 Col;
float Zero;
@ -2274,6 +2292,59 @@ struct LineFillRenderer {
static const int VtxConsumed = 5;
};
template <typename Getter1, typename Getter2, typename Transformer>
struct ShadedRenderer {
ShadedRenderer(Getter1 _getter1, Getter2 _getter2, Transformer _transformer, ImU32 col) :
getter1(_getter1),
getter2(_getter2),
transformer(_transformer),
Col(col)
{
Prims = ImMin(getter1.Count, getter2.Count) - 1;
p11 = transformer(getter1(0));
p12 = transformer(getter2(0));
}
inline bool operator()(ImDrawList& DrawList, ImVec2 uv, int prim) {
ImVec2 p21 = transformer(getter1(prim+1));
ImVec2 p22 = transformer(getter2(prim+1));
DrawList._VtxWritePtr[0].pos = p11;
DrawList._VtxWritePtr[0].uv = uv;
DrawList._VtxWritePtr[0].col = Col;
DrawList._VtxWritePtr[1].pos = p12;
DrawList._VtxWritePtr[1].uv = uv;
DrawList._VtxWritePtr[1].col = Col;
DrawList._VtxWritePtr[2].pos = p21;
DrawList._VtxWritePtr[2].uv = uv;
DrawList._VtxWritePtr[2].col = Col;
DrawList._VtxWritePtr[3].pos = p22;
DrawList._VtxWritePtr[3].uv = uv;
DrawList._VtxWritePtr[3].col = Col;
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 + 1);
DrawList._IdxWritePtr[4] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 2);
DrawList._IdxWritePtr[5] = (ImDrawIdx)(DrawList._VtxCurrentIdx + 3);
DrawList._IdxWritePtr += 6;
DrawList._VtxCurrentIdx += 4;
p11 = p21;
p12 = p22;
return true;
}
Getter1 getter1;
Getter2 getter2;
Transformer transformer;
int Prims;
ImU32 Col;
ImVec2 p11, p12;
static const int IdxConsumed = 6;
static const int VtxConsumed = 4;
};
// struct RectRenderer {
// RectRenderer(ImU32 col) { Col = col; }
// inline void operator()(ImDrawList& DrawList, const ImVec2& p1, const ImVec2& p2, ImVec2 uv) {
@ -2310,7 +2381,7 @@ struct LineFillRenderer {
template <typename Renderer>
inline void RenderPrimitives(Renderer renderer, ImDrawList& DrawList, bool cull) {
int prims_remain = renderer.Prims;
int prims = renderer.Prims;
int prims_culled = 0;
int idx = 0;
const ImVec2 uv = DrawList._Data->TexUvWhitePixel;
@ -2365,6 +2436,7 @@ template <typename Getter, typename Transformer>
inline void RenderLineFill(Getter getter, Transformer transformer, ImDrawList& DrawList, ImU32 col_fill) {
// TODO: Culling
float zero = transformer(0,0).y;
RenderPrimitives(LineFillRenderer<Getter,Transformer>(getter,transformer,col_fill,zero), DrawList, false);
// RenderPrimitives(getter, transformer, LineFillRenderer(col_fill, zero), DrawList, false);
}
@ -2583,6 +2655,47 @@ void PlotLine(const char* label_id, ImPlotPoint (*getter_func)(void* data, int i
return PlotEx(label_id, getter);
}
//-----------------------------------------------------------------------------
// PLOT SHADED
//-----------------------------------------------------------------------------
void PlotShaded(const char* label_id, const double* xs, const double* ys1, const double* ys2, int count, int offset, int stride) {
IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PlotShaded() 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;
GetterXsYs<double> getter1(xs, ys1, count, offset, stride);
GetterXsYs<double> getter2(xs, ys2, count, offset, stride);
ImDrawList & DrawList = *ImGui::GetWindowDrawList();
ImVec4 col_fill = gp.Style.Colors[ImPlotCol_Fill].w == -1 ? (item->Color) : (gp.Style.Colors[ImPlotCol_Fill]);
col_fill.w *= gp.Style.FillAlpha;
if (gp.Style.Colors[ImPlotCol_Fill].w != -1)
item->Color = gp.Style.Colors[ImPlotCol_Fill];
bool cull = HasFlag(plot->Flags, ImPlotFlags_CullData);
if (gp.FitThisFrame) {
for (int i = 0; i < count; ++i) {
ImPlotPoint p1 = getter1(i);
ImPlotPoint p2 = getter2(i);
FitPoint(p1);
FitPoint(p2);
}
}
PushPlotClipRect();
RenderPrimitives(ShadedRenderer<GetterXsYs<double>,GetterXsYs<double>,TransformerLinLin>(getter1,getter2,TransformerLinLin(y_axis), ImGui::GetColorU32(col_fill)), DrawList, false);
PopPlotClipRect();
}
//-----------------------------------------------------------------------------
// PLOT SCATTER
//-----------------------------------------------------------------------------

6
implot.h
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@ -93,6 +93,7 @@ enum ImPlotStyleVar_ {
ImPlotStyleVar_Marker, // int, marker specification
ImPlotStyleVar_MarkerSize, // float, marker size in pixels (roughly the marker's "radius")
ImPlotStyleVar_MarkerWeight, // float, outline weight of markers in pixels
ImPlotStyleVar_FillAlpha, // float, alpha modifier applied to plot fills
ImPlotStyleVar_ErrorBarSize, // float, error bar whisker width in pixels
ImPlotStyleVar_ErrorBarWeight, // float, error bar whisker weight in pixels
ImPlotStyleVar_DigitalBitHeight, // float, digital channels bit height (at 1) in pixels
@ -164,6 +165,7 @@ struct ImPlotStyle {
ImPlotMarker Marker; // = ImPlotMarker_None, marker specification
float MarkerSize; // = 4, marker size in pixels (roughly the marker's "radius")
float MarkerWeight; // = 1, outline weight of markers in pixels
float FillAlpha; // = 1, alpha modifier applied to plot fills
float ErrorBarSize; // = 5, error bar whisker width in pixels
float ErrorBarWeight; // = 1.5, error bar whisker weight in pixels
float DigitalBitHeight; // = 8, digital channels bit height (at y = 1.0f) in pixels
@ -209,6 +211,10 @@ void PlotLine(const char* label_id, const ImVec2* data, int count, int offset =
void PlotLine(const char* label_id, const ImPlotPoint* data, int count, int offset = 0);
void PlotLine(const char* label_id, ImPlotPoint (*getter)(void* data, int idx), void* data, int count, int offset = 0);
// Plots a shaded (filled) region between two lines. Intersecting lines are not currently supported.
void PlotShaded(const char* label_id, const double* xs, const double* ys1, const double* ys2, int count, int offset = 0, int stride = sizeof(double));
// Plots a standard 2D scatter plot.
void PlotScatter(const char* label_id, const float* values, int count, int offset = 0, int stride = sizeof(float));
void PlotScatter(const char* label_id, const double* values, int count, int offset = 0, int stride = sizeof(double));

19
implot_demo.cpp
View File

@ -224,6 +224,25 @@ void ShowDemoWindow(bool* p_open) {
ImPlot::EndPlot();
}
}
if (ImGui::CollapsingHeader("Shaded Plots")) {
static double xs[1001], ys[1001], ys1[1001], ys2[1001];
srand(0);
for (int i = 0; i < 1001; ++i) {
xs[i] = i * 0.001f;
ys[i] = 0.5f + 0.25f * Sin(25 * xs[i]) * Sin(5 * xs[i]) + RandomRange(-0.01f, 0.01f);
ys1[i] = ys[i] + RandomRange(0.1f, 0.12f);
ys2[i] = ys[i] - RandomRange(0.1f, 0.12f);
}
static float alpha = 0.25f;
ImGui::DragFloat("Alpha",&alpha,0.01f,0,1);
if (ImPlot::BeginPlot("Shaded Plots")) {
ImPlot::PushStyleVar(ImPlotStyleVar_FillAlpha, alpha);
ImPlot::PlotShaded("Uncertain Data",xs,ys1,ys2,1001);
ImPlot::PlotLine("Uncertain Data", xs, ys, 1001);
ImPlot::PopStyleVar();
ImPlot::EndPlot();
}
}
//-------------------------------------------------------------------------
if (ImGui::CollapsingHeader("Scatter Plots")) {
srand(0);