var
ShuffLayer = cc.Layer.extend({
_turnImg1:
null
,
_turnImg2:
null
,
init:
function
(){
var
bRef =
false
;
if
(
this
._super()){
this
.steupView(sRes.backgroud);
bRef =
true
;
}
return
bRef;
},
steupView:
function
(fileName){
this
._turnImg1 =
new
cc.Sprite(fileName);
this
._turnImg1.setPosition(cc.p(
this
._turnImg1.getContentSize().width/2,
this
._turnImg1.getContentSize().height/2));
this
.addChild(
this
._turnImg1);
this
._turnImg2 =
new
cc.Sprite(fileName);
this
._turnImg2.setPosition(cc.p(
this
._turnImg2.getContentSize().width * 1.5,
this
._turnImg2.getContentSize().height /2));
this
.addChild(
this
._turnImg2);
},
onEnter:
function
(){
this
._super();
this
.scheduleUpdate();
},
update:
function
(dt){
if
(
this
._turnImg1.getPositionX()<=-
this
._turnImg1.getContentSize().width/2) {
this
._turnImg1.setPosition(cc.p(
this
._turnImg1.getContentSize().width * 1.5 -1,
this
._turnImg1.getContentSize().height/2));
}
else
{
//如果还没需要换位置就让他向下移动一个像素
this
._turnImg1.setPosition(cc.pAdd(
this
._turnImg1.getPosition(),cc.p(-1,0)));
}
//如果第二张背景图移出屏幕最下方则重新设置他的位置在屏幕的最上方
if
(
this
._turnImg2.getPositionX() <= -
this
._turnImg2.getContentSize().width / 2) {
this
._turnImg2.setPosition(cc.p(
this
._turnImg2.getContentSize().width * 1.5 -1,
this
._turnImg2.getContentSize().height / 2));
}
else
{
//向下移动
this
._turnImg2.setPosition(cc.pAdd(
this
._turnImg2.getPosition(),0)));
}
}
});
ShuffLayer.create =
function
() {
var
ly =
new
ShuffLayer();
if
(ly && ly.init()){
return
ly;}
return
null
;
};
ShuffLayer.scene =
function
() {
var
sc =
new
cc.Scene();
sc.addChild(ShuffLayer.create());
return
sc;};
returncc.p(v1.x + v2.x,v1.y + v2.y);};
函数源码cc.pSub =function(v1,v2) {
returncc.p(v1.x - v2.x,v1.y - v2.y);};
实战代码练习
ctor:function(){
this._super();
size=cc.winSize;
sprite=newcc.Sprite(res.runbg);
sprite.attr({
x:sprite.getContentSize().width/2,
y:sprite.getContentSize().height/2
});
this.addChild(sprite,1);
sprite2=newcc.Sprite(res.runbg2);
sprite2.attr({
x:sprite2.getContentSize().width*1.5,
y:sprite2.getContentSize().height/2
});
this.addChild(sprite2,0);
this.schedule(this.SpriteMove,0.1);},
SpriteMove:if(sprite.getPositionX()<=-sprite.getContentSize().width/2) {sprite.setPositionX(sprite.getContentSize().width*1.5-18);}
else{
sprite.setPositionX(sprite.getPositionX()-10);}
if(sprite2.getPositionX()<=-sprite2.getContentSize().width/2) {
sprite2.setPositionX(sprite.getContentSize().width*1.5);}else{sprite2.setPositionX(sprite2.getPositionX()-10);}}
