docs: plot polygon method description

Author: brenocq

implot.h

@@ -967,7 +967,7 @@ IMPLOT_API void PlotScatterG(const char* label_id, ImPlotGetter getter, void* da
 IMPLOT_TMP void PlotBubbles(const char* label_id, const T* values, const T* szs, int count, double xscale=1, double xstart=0, const ImPlotSpec& spec=ImPlotSpec());
 IMPLOT_TMP void PlotBubbles(const char* label_id, const T* xs, const T* ys, const T* szs, int count, const ImPlotSpec& spec=ImPlotSpec());
 
-// Plots a polygon. Points are specified as separate x and y arrays. Supports both convex and concave polygons.
+// Plots a polygon. Points are specified in counter-clockwise order. If concave, make sure to set the Concave flag.
 IMPLOT_TMP void PlotPolygon(const char* label_id, const T* xs, const T* ys, int count, const ImPlotSpec& spec=ImPlotSpec());
 
 // 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_items.cpp

@@ -1959,7 +1959,7 @@ void PlotPolygonEx(const char* label_id, const Getter& getter, const ImPlotSpec&
         const ImPlotAxis& y_axis = GetCurrentPlot()->Axes[GetCurrentPlot()->CurrentY];
         Transformer2 transformer(x_axis, y_axis);
 
-        // Flip points to make sure they are in clockwise order for correct filling when one axis is inverted
+        // Flip points to make sure they are in counter-clockwise order for correct filling when one axis is inverted
         bool x_inv = ImHasFlag(x_axis.Flags, ImPlotAxisFlags_Invert);
         bool y_inv = ImHasFlag(y_axis.Flags, ImPlotAxisFlags_Invert);
         bool flip = !((x_inv ? 1 : 0) ^ (y_inv ? 1 : 0));