add custom rendering utils

implot.cpp

@@ -1295,6 +1295,35 @@ void SetNextPlotRangeY(float y_min, float y_max, ImGuiCond cond) {
     gp.NextPlotData.YMax = y_max;
 }
 
+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();
+}
+
+ImVec2 PixelsToPlot(const ImVec2& pix) {
+    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PixelsToPlot() Needs to be called between BeginPlot() and EndPlot()!");
+    return gp.FromPixels(pix);
+}
+
+ImVec2 PlotToPixels(const ImVec2& plt) {
+    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PlotToPixels() Needs to be called between BeginPlot() and EndPlot()!");
+    return gp.ToPixels(plt);
+}
+
+void PushPlotClipRect() {
+    IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "PushPlotClipRect() Needs to be called between BeginPlot() and EndPlot()!");
+    PushClipRect(gp.BB_Grid.Min, gp.BB_Grid.Max, true);
+}
+
+void PopPlotClipRect() {
+    PopClipRect();
+}
+
 bool IsPlotHovered() { 
     IM_ASSERT_USER_ERROR(gp.CurrentPlot != NULL, "IsPlotHovered() Needs to be called between BeginPlot() and EndPlot()!");
     return gp.Hov_Grid; 

implot.h

@@ -147,28 +147,6 @@ bool BeginPlot(const char* title_id,
 // of an if statement conditioned on BeginPlot().
 void EndPlot();
 
-/// Set the axes ranges of the next plot. Call right before BeginPlot(). If ImGuiCond_Always is used, the axes will be locked.
-void SetNextPlotRange(float x_min, float x_max, float y_min, float y_max, ImGuiCond cond = ImGuiCond_Once);
-/// Set the X axis range of the next plot. Call right before BeginPlot(). If ImGuiCond_Always is used, the axis will be locked.
-void SetNextPlotRangeX(float x_min, float x_max, ImGuiCond cond = ImGuiCond_Once);
-/// Set the X axis range of the next plot. Call right before BeginPlot(). If ImGuiCond_Always is used, the axis will be locked.
-void SetNextPlotRangeY(float y_min, float y_max, ImGuiCond cond = ImGuiCond_Once);
-
-//-----------------------------------------------------------------------------
-// Plot Queries
-//-----------------------------------------------------------------------------
-
-/// Returns true if the plot area in the current or most recent plot is hovered.
-bool IsPlotHovered();
-/// Returns the mouse position in x,y coordinates of the current or most recent plot.
-ImVec2 GetPlotMousePos();
-/// Returns the current or most recent plot axis range.
-ImPlotRange GetPlotRange();
-/// Returns true if the current or most recent plot is being queried.
-bool IsPlotQueried();
-/// Returns the current or most recent plot querey range.
-ImPlotRange GetPlotQuery();
-
 //-----------------------------------------------------------------------------
 // Plot Items
 //-----------------------------------------------------------------------------
@@ -192,6 +170,21 @@ void PlotErrorBars(const char* label_id, ImVec4 (*getter)(void* data, int idx),
 // Plots a text label at point x,y.
 void PlotLabel(const char* text, float x, float y, bool vertical = false, const ImVec2& pixel_offset = ImVec2(0,0));
 
+//-----------------------------------------------------------------------------
+// Plot Queries
+//-----------------------------------------------------------------------------
+
+/// Returns true if the plot area in the current or most recent plot is hovered.
+bool IsPlotHovered();
+/// Returns the mouse position in x,y coordinates of the current or most recent plot.
+ImVec2 GetPlotMousePos();
+/// Returns the current or most recent plot axis range.
+ImPlotRange GetPlotRange();
+/// Returns true if the current or most recent plot is being queried.
+bool IsPlotQueried();
+/// Returns the current or most recent plot querey range.
+ImPlotRange GetPlotQuery();
+
 //-----------------------------------------------------------------------------
 // Plot Styling
 //-----------------------------------------------------------------------------
@@ -218,6 +211,32 @@ void PushPlotStyleVar(ImPlotStyleVar idx, int val);
 // Undo temporary style modification.
 void PopPlotStyleVar(int count = 1);
 
+//-----------------------------------------------------------------------------
+// Plot Utils
+//-----------------------------------------------------------------------------
+
+/// Set the axes ranges of the next plot. Call right before BeginPlot(). If ImGuiCond_Always is used, the axes will be locked.
+void SetNextPlotRange(float x_min, float x_max, float y_min, float y_max, ImGuiCond cond = ImGuiCond_Once);
+/// Set the X axis range of the next plot. Call right before BeginPlot(). If ImGuiCond_Always is used, the axis will be locked.
+void SetNextPlotRangeX(float x_min, float x_max, ImGuiCond cond = ImGuiCond_Once);
+/// Set the X axis range of the next plot. Call right before BeginPlot(). If ImGuiCond_Always is used, the axis will be locked.
+void SetNextPlotRangeY(float y_min, float y_max, ImGuiCond cond = ImGuiCond_Once);
+
+// Get the current Plot position (top-left) in pixels.
+ImVec2 GetPlotPos();
+// Get the curent Plot size in pixels.
+ImVec2 GetPlotSize();
+
+// Convert pixels to a position in the current plot's coordinate system.
+ImVec2 PixelsToPlot(const ImVec2& pix);
+// Convert a position in the current plot's coordinate system to pixels.
+ImVec2 PlotToPixels(const ImVec2& plt);
+
+// Push clip rect for rendering to current plot area
+void PushPlotClipRect();
+// Pop plot clip rect
+void PopPlotClipRect();
+
 //-----------------------------------------------------------------------------
 // Demo
 //-----------------------------------------------------------------------------

implot_demo.cpp

@@ -23,7 +23,6 @@
 // ImPlot v0.1 WIP
 
 #include <implot.h>
-#include <imgui_internal.h>
 #include <iostream>
 
 namespace {
@@ -48,7 +47,7 @@ struct RollingData {
     ImVector<ImVec2> Data;
     RollingData() { Data.reserve(1000); }
     void AddPoint(float x, float y) {
-        float xmod = ImFmod(x, Span);
+        float xmod = fmodf(x, Span);
         if (!Data.empty() && xmod < Data.back().x)
             Data.shrink(0);
         Data.push_back(ImVec2(xmod, y));
@@ -493,6 +492,18 @@ void ShowImPlotDemoWindow(bool* p_open) {
         ImGui::PopPlotStyleVar();
         ImGui::RestorePlotPalette();
     }
+    if (ImGui::CollapsingHeader("Custom Rendering")) {
+        if (ImGui::BeginPlot("##CustomRend",NULL,NULL,{-1,300})) {
+            ImVec2 cntr = ImGui::PlotToPixels({0.5f,  0.5f});
+            ImVec2 rmin = ImGui::PlotToPixels({0.25f, 0.75f});
+            ImVec2 rmax = ImGui::PlotToPixels({0.75f, 0.25f});
+            ImGui::PushPlotClipRect();
+            ImGui::GetWindowDrawList()->AddCircleFilled(cntr,20,IM_COL32(255,255,0,255),20);
+            ImGui::GetWindowDrawList()->AddRect(rmin, rmax, IM_COL32(128,0,255,255));
+            ImGui::PopPlotClipRect();
+            ImGui::EndPlot();
+        }
+    }
     //-------------------------------------------------------------------------
     // if (ImGui::CollapsingHeader("Benchmark")) {