code: public void invertArc(final Rectangle2D pRectangle, int pStartAngle, int pArcAngle) {
          invertShape(toArc(pRectangle, pStartAngle, pArcAngle, true));
      }
docs: InvertArc(r,int,int) // reverses the color of all pixels in the arc
  
  @param pRectangle  the rectangle to invert
  @param pStartAngle start angle in degrees (starting from 12'o clock, this differs from Java)
  @param pArcAngle   rotation angle in degrees (starting from {@code pStartAngle}, this differs from Java arcs)