bezierCurveTo method
From the current point in the path, draw a bezier curve to endX
and endY
Implementation
GraphicsCommandBezierCurveTo bezierCurveTo(num controlX1, num controlY1,
num controlX2, num controlY2, num endX, num endY) {
final command = GraphicsCommandBezierCurveTo(
controlX1, controlY1, controlX2, controlY2, endX, endY);
addCommand(command);
return command;
}