Ellipse Motion^{v 0.1}

A sample ellipse motion
实现简单的椭圆轨迹运动

function ellipseMove(mc:MovieClip, x1:Number, y1:Number, a:Number, b:Number, deltaAng:Number, t:Number) {
	var deltaX:Number;
	var deltaY:Number;
	!mc.ang ? mc.ang=0 : mc.ang=mc.ang;
	deltaAng = deltaAng*Math.PI/180;
	ang = deltaAng+mc.ang;
	angTween = new Tween(mc, "ang", mx.transitions.easing.Strong.easeOut, mc.ang, ang, t, true);
	angTween.onMotionChanged = function() {
		mc.enabled = false;
		deltaY = b*Math.sin(mc.ang);
		deltaX = a*Math.cos(mc.ang);
		posX = deltaX+x1;
		posY = deltaY+y1;
		mc._x = posX;
		mc._y = posY;
		mc.swapDepths(this._y);
	};
	angTween.onMotionFinished = function() {
		mc.enabled = true;
	};
}