Feat: Per-Index Color/Size Support with ImPlotSpec

implot.h

@@ -138,13 +138,18 @@ enum ImAxis_ {
 // Plotting properties. These provide syntactic sugar for creating ImPlotSpecs from (ImPlotProp,value) pairs. See ImPlotSpec documentation.
 enum ImPlotProp_ {
     ImPlotProp_LineColor,       // line color (applies to lines, bar edges); IMPLOT_AUTO_COL will use next Colormap color or current item color
+    ImPlotProp_LineColors,      // array of colors for each line; if nullptr, use LineColor for all lines
     ImPlotProp_LineWeight,      // line weight in pixels (applies to lines, bar edges, marker edges)
     ImPlotProp_FillColor,       // fill color (applies to shaded regions, bar faces); IMPLOT_AUTO_COL will use next Colormap color or current item color
-    ImPlotProp_FillAlpha,       // alpha multiplier (applies to FillColor and MarkerFillColor)
+    ImPlotProp_FillColors,      // array of colors for each fill; if nullptr, use FillColor for all fills
+    ImPlotProp_FillAlpha,       // alpha multiplier (applies to FillColor, FillColors, MarkerFillColor, and MarkerFillColors)
     ImPlotProp_Marker,          // marker type; specify ImPlotMarker_Auto to use the next unused marker
     ImPlotProp_MarkerSize,      // size of markers (radius) *in pixels*
+    ImPlotProp_MarkerSizes,     // array of sizes for each marker; if nullptr, use MarkerSize for all markers
     ImPlotProp_MarkerLineColor, // marker edge color; IMPLOT_AUTO_COL will use LineColor
+    ImPlotProp_MarkerLineColors, // array of colors for each marker edge; if nullptr, use MarkerLineColor for all markers
     ImPlotProp_MarkerFillColor, // marker face color; IMPLOT_AUTO_COL will use LineColor
+    ImPlotProp_MarkerFillColors, // array of colors for each marker face; if nullptr, use MarkerFillColor for all markers
     ImPlotProp_Size,            // size of error bar whiskers (width or height), and digital bars (height) *in pixels*
     ImPlotProp_Offset,          // data index offset
     ImPlotProp_Stride,          // data stride in bytes; IMPLOT_AUTO will result in sizeof(T) where T is the type passed to PlotX
@@ -509,13 +514,18 @@ enum ImPlotBin_ {
 //    });
 struct ImPlotSpec {
     ImVec4          LineColor       = IMPLOT_AUTO_COL;       // line color (applies to lines, bar edges); IMPLOT_AUTO_COL will use next Colormap color or current item color
+    ImU32*          LineColors      = nullptr;               // array of colors for each line; if nullptr, use LineColor for all lines
     float           LineWeight      = 1.0f;                  // line weight in pixels (applies to lines, bar edges, marker edges)
     ImVec4          FillColor       = IMPLOT_AUTO_COL;       // fill color (applies to shaded regions, bar faces); IMPLOT_AUTO_COL will use next Colormap color or current item color
-    float           FillAlpha       = 1.0f;                  // alpha multiplier (applies to FillColor and MarkerFillColor)
+    ImU32*          FillColors      = nullptr;               // array of colors for each fill; if nullptr, use FillColor for all fills
+    float           FillAlpha       = 1.0f;                  // alpha multiplier (applies to FillColor, FillColors, MarkerFillColor, and MarkerFillColors)
     ImPlotMarker    Marker          = ImPlotMarker_None;     // marker type; specify ImPlotMarker_Auto to use the next unused marker
     float           MarkerSize      = 4;                     // size of markers (radius) *in pixels*
+    float*          MarkerSizes     = nullptr;               // array of sizes for each marker; if nullptr, use MarkerSize for all markers
     ImVec4          MarkerLineColor = IMPLOT_AUTO_COL;       // marker edge color; IMPLOT_AUTO_COL will use LineColor
+    ImU32*          MarkerLineColors = nullptr;              // array of colors for each marker edge; if nullptr, use MarkerLineColor for all markers
     ImVec4          MarkerFillColor = IMPLOT_AUTO_COL;       // marker face color; IMPLOT_AUTO_COL will use LineColor
+    ImU32*          MarkerFillColors = nullptr;              // array of colors for each marker face; if nullptr, use MarkerFillColor for all markers
     float           Size            = 4;                     // size of error bar whiskers (width or height), and digital bars (height) *in pixels*
     int             Offset          = 0;                     // data index offset
     int             Stride          = IMPLOT_AUTO;           // data stride in bytes; IMPLOT_AUTO will result in sizeof(T) where T is the type passed to PlotX
@@ -559,6 +569,27 @@ struct ImPlotSpec {
         IM_ASSERT(0 && "User provided an ImPlotProp which cannot be set from scalar value!");
     }
 
+    // Set a property from a pointer value.
+    void SetProp(ImPlotProp prop, ImU32* v) {
+        switch (prop) {
+        case ImPlotProp_LineColors       : LineColors       = v;  return;
+        case ImPlotProp_FillColors       : FillColors       = v;  return;
+        case ImPlotProp_MarkerLineColors : MarkerLineColors = v;  return;
+        case ImPlotProp_MarkerFillColors : MarkerFillColors = v;  return;
+        default: break;
+        }
+        IM_ASSERT(0 && "User provided an ImPlotProp which cannot be set from pointer value!");
+    }
+
+    // Set a property from a float pointer value.
+    void SetProp(ImPlotProp prop, float* v) {
+        switch (prop) {
+        case ImPlotProp_MarkerSizes : MarkerSizes = v; return;
+        default: break;
+        }
+        IM_ASSERT(0 && "User provided an ImPlotProp which cannot be set from float pointer value!");
+    }
+
     // Set a property from an ImVec4 value.
     void SetProp(ImPlotProp prop, const ImVec4& v) {
         switch (prop) {