circleRgba function
Implementation
bool circleRgba(
  Pointer<SdlRenderer> renderer,
  double x,
  double y,
  double rad,
  int r,
  int g,
  int b,
  int a, {
  int blendMode = SDL_BLENDMODE_BLEND,
}) => ellipseRgba(renderer, x, y, rad, rad, r, g, b, a, blendMode: blendMode);