creator 橡皮檫

废话不逼逼 直接上代码

拆分一下 ，四个状态 ，手指触屏开始，手指移动擦除，手指离开屏幕，手指离开屏幕到canvas外面

this.node.on(cc.Node.EventType.TOUCH_START, this._onTouchBegin, this);
this.node.on(cc.Node.EventType.TOUCH_MOVE, this._onTouchMoved, this);
this.node.on(cc.Node.EventType.TOUCH_END, this._onTouchEnd, this);
this.node.on(cc.Node.EventType.TOUCH_CANCEL, this._onTouchCancel, this);

定义好四个状态后 开始写逻辑

_onTouch_onTouchBegin:function (event) {

cc.log('touchBegin');

var point = event.touch.getLocation();
point = this.node.convertToNodeSpaceAR(point);
this._addCircle(point);
},

_addCircle:function (point) {
var stencil = this.mask._clippingStencil;
var color = cc.color(255, 255, 255, 0);
stencil.drawPoly(this.mask._calculateCircle(point,cc.p(50,50), 64), color, 0, color);
if (!CC_JSB) {
cc.renderer.childrenOrderDirty = true;
}
},