打砖块

var app = new PIXI.Application(500,600);
document.body.appendChild(app.view);
var arr = [];
for(var i=0;i<5;i++){
    for(var j=0;j<14;j++){
        var zhuan = new PIXI.Sprite.fromImage("res/lianxi/zhuan/zhuankuai-8-1_41.png");
        app.stage.addChild(zhuan);
        zhuan.width = 32;
        zhuan.height = 32;
        zhuan.x = j*35+5;
        zhuan.y = i*35+5;
        //将方块放入数组
        arr.push(zhuan);
    }
}
var qiu = new PIXI.Sprite.fromImage("res/lianxi/zhuan/qiu_32.png");
app.stage.addChild(qiu);
qiu.x = 270;
qiu.y = 570;
var a1 = 5;
var a2 = 5;
var b = 16+10;
app.ticker.add(aaa);
function aaa(){
    xiao();
    peng();
}
//小球移动
function xiao(){
    qiu.x -= a1;
    qiu.y -= a2;
    if(qiu.x<=0||qiu.x>=500){
        a1 = -a1;
    }
    if(qiu.y<=0||qiu.y>=600){
        a2 = -a2;
    }
}
//碰撞
function peng(){
    for(var i = arr.length-1;i>=0;i--){
        var c1 = arr[i].x-qiu.x;
        var c2 = arr[i].y-qiu.y;
        if(b*b>=(c1*c1+c2*c2)){
            a1 = -a1;
            a2 = -a2;
            app.stage.removeChild(arr[i]);
            arr.splice(i,1);
        }
    }
}