果实不能显示,没有报错

来源:2-5 果实绘制(果实上浮)

mo小莫

2016-03-08 16:23

var fruitObj=function(){
    this.alive=[];
    this.x=[];
    this.y=[];
    this.l=[];
    this.spd=[];
    this.orange=new Image();
    this.blue=new Image();
}

fruitObj.prototype.num=30;//bool

fruitObj.prototype.init=function(){
    for(var i=0;i<this.num;i++)
    {
        this.alive[i]=true;
        this.x[i]=0;
        this.y[i]=0;
        this.spd[i]=Math.random()*0.01+0.005;
        this.born(i);
    }
    this.orange.src="./src/fruit.png";
    this.blue.src="./src/blue.png";
}

fruitObj.prototype.draw=function(){
    for (var i=0;i<this.num;i++){
        //draw
        //find an ane,grow,fly up
        if(this.alive[i]){
            if(this.l[i]<=14)
            {
                this.l[i]+=this.spd[i]*deltaTime;
            }
            else
            {
                this.l[i]-=this.spd[i]*7*deltaTime;
            }
            ctx2.drawImage(this.orange,this.x[i] - this.l[i]*0.5,this.y[i]-this.l[i]*0.5,this.l[i],this.l[i]);
            if(this.y[i]<10)
            {
                this.alive[i]=false;
            }
        }
    }
}

fruitObj.prototype.born=function(i){
    var aneID=Math.floor(Math.random() *ane.num);
    this.x[i]=ane.x[aneID];
    this.y[i]=canHeight-ane.len[aneID];
    this.l[i]=0;
}


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5回答

  • mmotiy
    2016-03-09 12:06:03
    已采纳
    fruitObj.prototype.draw=function(){
        for (var i=0;i<this.num;i++){
            //draw
            //find an ane,grow,fly up
            if(this.alive[i]){//as alive before
                if(this.l[i]<=14)
                {
                    this.l[i]+=this.spd[i]*deltaTime;
                }
                else
                {
                    this.l[i]-=this.spd[i]*7*deltaTime;
                }
                ctx2.drawImage(this.orange,this.x[i] - this.l[i]*0.5,this.y[i]-this.l[i]*0.5,this.l[i],this.l[i]);
                if(this.y[i]<10)
                {
                    this.alive[i]=false;//as alive before
                }
            }
        }
    }


    mo小莫

    错误是在deltaTime那里

    2016-03-09 16:09:54

    共 3 条回复 >

  • xixi65
    2017-05-20 17:12:33

    想问下果实为什么出不来,请问是怎么解决的

  • 慕UI1547199
    2016-11-30 08:50:51

    我也是怎么,请问是怎么解决的

    慕UI154... 回复mo小莫

    好的,谢谢

    2016-12-05 08:24:58

    共 3 条回复 >

  • qq_皮儿_0
    2016-04-12 11:54:54

    /**
    * Created by lina.zheng on 2016/4/12.
    */
    var fruitObj=function () {
       this.alive=[]
       this.x=[];
       this.y=[];
       this.l=[];
       this.spd=[];
       this.orange=new Image();
       this.blue=new Image();

    }
    fruitObj.prototype.num=30;
    fruitObj.prototype.init=function () {
       for (var i=0;i<this.num;i++){
           this.alive=true;
           this.x[i]=0;
           this.y[i]=0;
           this.l[i]=0;
           this.spd[i]=Math.random()*0.01+0.005;//从0.005-0.015
           this.bron(i);//所有果实出身
       }
       this.orange.src="./src/fruit.png"
       this.orange.src="./src/blue.png"
    }
    fruitObj.prototype.draw=function () {
       for(var i=0;i<this.num;i++) {
           //画果实
           if (this.alive[i]) {
               if (this.l[i] <= 14) {
                   this.l[i] += this.spd[i] * deltaTime;
               }
               else {
                   this.y[i] -= this.spd[i] * 7 * deltaTime;
               }
               ctx2.drawImage(this.orange, this.x[i] - this.l[i] * 0.5, this.y[i] - this.l[i] * 0.5, this.l[i], this.l[i]);
               if (this.y[i] < 10) {
                   this.alive[i] = false;
               }
           }

       }
       }
    //随机寻找海葵
    fruitObj.prototype.bron=function (i) {
       var aneid=Math.floor(Math.random()*ane.num);
       this.x[i]=ane.x[aneid];
       this.y[i]=canHeight-ane.len[aneid];
       this.l[i]=0;
    }


    // fruitObj.prototype.update=function () {
    //     var num=0;
    //     for(var i=0;i<this.num;i++){
    //         if (this.alive[i])num++;
    //     }
    // }


    可以看出我哪边错了么   我找了好久   if (this.alive[i]) {}这个一加进去就泡泡就出不来了

  • 默小柒
    2016-03-09 13:40:01

    先打印一下this.l[i]和deltaTime结果是否是正确的

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