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Custom per-item colors for line and scatter plot #608

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fbbb499
adding per-item colors with ColorGetterFuncPtr
mihaly-sisak Jan 18, 2025
2ca07e9
add custom colors demo
mihaly-sisak Jan 18, 2025
857ee7f
add custom color scatter plot
mihaly-sisak Jan 18, 2025
48b93b5
cache u32 colors[5]
mihaly-sisak Jan 18, 2025
669b25e
Merge remote-tracking branch 'upstream/master'
mihaly-sisak Jan 25, 2025
44fb8bd
more consistent naming
mihaly-sisak Jan 25, 2025
31ed777
Drag functions parameter: held -> out_held in header
mihaly-sisak Oct 11, 2025
244030d
Merge pull request #1 from mihaly-sisak/patch-1
mihaly-sisak Oct 11, 2025
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13 changes: 9 additions & 4 deletions implot.h
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Original file line number Diff line number Diff line change
Expand Up @@ -589,6 +589,9 @@ typedef int (*ImPlotFormatter)(double value, char* buff, int size, void* user_da
// Callback signature for data getter.
typedef ImPlotPoint (*ImPlotGetter)(int idx, void* user_data);

// Callback signature for color getter.
typedef ImU32 (*ImPlotColorGetter)(ImPlotCol col, int idx, void* user_data);

// Callback signature for axis transform.
typedef double (*ImPlotTransform)(double value, void* user_data);

Expand Down Expand Up @@ -858,11 +861,13 @@ IMPLOT_API void SetNextAxesToFit();
IMPLOT_TMP void PlotLine(const char* label_id, const T* values, int count, double xscale=1, double xstart=0, ImPlotLineFlags flags=0, int offset=0, int stride=sizeof(T));
IMPLOT_TMP void PlotLine(const char* label_id, const T* xs, const T* ys, int count, ImPlotLineFlags flags=0, int offset=0, int stride=sizeof(T));
IMPLOT_API void PlotLineG(const char* label_id, ImPlotGetter getter, void* data, int count, ImPlotLineFlags flags=0);
IMPLOT_API void PlotLineCG(const char* label_id, ImPlotGetter getter_func, void* data, int count, ImPlotColorGetter color_func, void* color_data, ImPlotLineFlags flags=0);

// Plots a standard 2D scatter plot. Default marker is ImPlotMarker_Circle.
IMPLOT_TMP void PlotScatter(const char* label_id, const T* values, int count, double xscale=1, double xstart=0, ImPlotScatterFlags flags=0, int offset=0, int stride=sizeof(T));
IMPLOT_TMP void PlotScatter(const char* label_id, const T* xs, const T* ys, int count, ImPlotScatterFlags flags=0, int offset=0, int stride=sizeof(T));
IMPLOT_API void PlotScatterG(const char* label_id, ImPlotGetter getter, void* data, int count, ImPlotScatterFlags flags=0);
IMPLOT_API void PlotScatterCG(const char* label_id, ImPlotGetter getter, void* data, int count, ImPlotColorGetter color_func, void* color_data, ImPlotScatterFlags flags=0);

// Plots a a stairstep graph. The y value is continued constantly to the right from every x position, i.e. the interval [x[i], x[i+1]) has the value y[i]
IMPLOT_TMP void PlotStairs(const char* label_id, const T* values, int count, double xscale=1, double xstart=0, ImPlotStairsFlags flags=0, int offset=0, int stride=sizeof(T));
Expand Down Expand Up @@ -937,13 +942,13 @@ IMPLOT_API void PlotDummy(const char* label_id, ImPlotDummyFlags flags=0);
// user interactions can be retrieved through the optional output parameters.

// Shows a draggable point at x,y. #col defaults to ImGuiCol_Text.
IMPLOT_API bool DragPoint(int id, double* x, double* y, const ImVec4& col, float size = 4, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* held = nullptr);
IMPLOT_API bool DragPoint(int id, double* x, double* y, const ImVec4& col, float size = 4, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* out_held = nullptr);
// Shows a draggable vertical guide line at an x-value. #col defaults to ImGuiCol_Text.
IMPLOT_API bool DragLineX(int id, double* x, const ImVec4& col, float thickness = 1, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* held = nullptr);
IMPLOT_API bool DragLineX(int id, double* x, const ImVec4& col, float thickness = 1, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* out_held = nullptr);
// Shows a draggable horizontal guide line at a y-value. #col defaults to ImGuiCol_Text.
IMPLOT_API bool DragLineY(int id, double* y, const ImVec4& col, float thickness = 1, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* held = nullptr);
IMPLOT_API bool DragLineY(int id, double* y, const ImVec4& col, float thickness = 1, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* out_held = nullptr);
// Shows a draggable and resizeable rectangle.
IMPLOT_API bool DragRect(int id, double* x1, double* y1, double* x2, double* y2, const ImVec4& col, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* held = nullptr);
IMPLOT_API bool DragRect(int id, double* x1, double* y1, double* x2, double* y2, const ImVec4& col, ImPlotDragToolFlags flags = 0, bool* out_clicked = nullptr, bool* out_hovered = nullptr, bool* out_held = nullptr);

// Shows an annotation callout at a chosen point. Clamping keeps annotations in the plot area. Annotations are always rendered on top.
IMPLOT_API void Annotation(double x, double y, const ImVec4& col, const ImVec2& pix_offset, bool clamp, bool round = false);
Expand Down
33 changes: 33 additions & 0 deletions implot_demo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2165,7 +2165,39 @@ void Demo_CustomPlottersAndTooltips() {
MyImPlot::PlotCandlestick("GOOGL",dates, opens, closes, lows, highs, 218, tooltip, 0.25f, bullCol, bearCol);
ImPlot::EndPlot();
}
}

void Demo_CustomColors() {

if (ImPlot::BeginPlot("Custom Colors")){
ImPlot::PlotLineCG("Line Plot",
[](int idx, void* user_data){
return ImPlotPoint(0.1*idx, sin(0.1*idx));
}, nullptr, 100,
[](ImPlotCol col, int idx, void* user_data){
switch (idx % 3){
case 0 : return 0xFF0000FFu;
case 1 : return 0xFF00FF00u;
case 2 : return 0xFFFF0000u;
default: return 0u;
}
}, nullptr);
ImPlot::PlotScatterCG("Scatter Plot",
[](int idx, void* user_data){
srand(idx);
return ImPlotPoint(10.0*float(rand())/float(RAND_MAX), -1.0+2.0*float(rand())/float(RAND_MAX));
}, nullptr, 20,
[](ImPlotCol col, int idx, void* user_data){
switch (idx % 3){
case 0 : return 0xFF0000FFu;
case 1 : return 0xFF00FF00u;
case 2 : return 0xFFFF0000u;
default: return 0u;
}
}, nullptr);
ImPlot::EndPlot();
}
}

//-----------------------------------------------------------------------------
// DEMO WINDOW
Expand Down Expand Up @@ -2254,6 +2286,7 @@ void ShowDemoWindow(bool* p_open) {
DemoHeader("Images", Demo_Images);
DemoHeader("Markers and Text", Demo_MarkersAndText);
DemoHeader("NaN Values", Demo_NaNValues);
DemoHeader("Custom Colors", Demo_CustomColors);
ImGui::EndTabItem();
}
if (ImGui::BeginTabItem("Subplots")) {
Expand Down
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