draw method
Implementation
@override
void draw(Canvas canvas, Color color, [bool drawBoundingBox = false]) {
Shape.paint.style = PaintingStyle.fill;
Shape.paint.color = color;
canvas.drawCircle(Offset(position.x, position.y), radius, Shape.paint);
if (drawBoundingBox) super.draw(canvas, const Color(0xFFFFFFFF));
}