ellipseColor function
Implementation
bool ellipseColor(Pointer<SdlRenderer> renderer, double x, double y, double rx,
double ry, int color) {
var co = Uint32List.fromList([color]).buffer.asUint8List();
return _ellipseRgba(renderer, x, y, rx, ry, co[0], co[1], co[2], co[3], 0);
}