鼠标点击角度

/*

让图片旋转到鼠标点击的位置

*/

//     创建一个Sprite,并将他显示在屏幕的中间

var mySprite = new cc.Sprite("res/B1.png")
mySprite.setPosition(cc.winSize.width >> 1, cc.winSize.height >> 1)
mySprite.setAnchorPoint(0,0.5)
this.addChild(mySprite)

var that = this;
var listener = cc.EventListener.create({
    event:cc.EventListener.TOUCH_ONE_BY_ONE,
    swallowTouches: true,
    onTouchBegan: function (touch, event) {
        var locationInNode = touch.getLocation()     //  获取鼠标点击屏幕的位置
        var o = listener .x-mySprite.x
        var a = listener.y-mySprite.y
        cc.log(o,a)
        var at = Math.atan(o / a) * 180 / Math.PI
        cc.log(at)
        if (a < 0) {
            if (o < 0)
                at = 180 + Math.abs(at);
            else
                at = 180 - Math.abs(at);
        }
        at-= 90
        cc.log(at)
        var rotate = cc.rotateTo(2,at)
        mySprite.runAction(rotate)

	});
	cc.eventManager.addListener(listener, this);