pieColor function
Implementation
int pieColor(Pointer<SdlRenderer> renderer, int x, int y, int rad, int start,
int end, int color) {
var co = Uint32List.fromList([color]).buffer.asUint8List();
return _pieRgba(
renderer, x, y, rad, start, end, co[0], co[1], co[2], co[3], 0);
}