Source
GraphicsCommandBezierCurveTo( num controlX1, num controlY1, num controlX2, num controlY2, num endX, num endY) : _controlX1 = controlX1.toDouble(), _controlY1 = controlY1.toDouble(), _controlX2 = controlX2.toDouble(), _controlY2 = controlY2.toDouble(), _endX = endX.toDouble(), _endY = endY.toDouble();