海葵不是从无到有逐渐变大而是突然出现向左移动?怎么回事?
var fruitObj=function(){
this.alive=[];//bool
this.x=[];
this.y=[];
this.l=[];
this.orange=new Image();
this.blue=new Image();
}
fruitObj.prototype.num=30;//fruit num
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.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 ang ,graw,fly up
if(this.l[i]<=14){
this.l[i]+=0.01*deltaTime;
}
else{
this.y[i]-=0.07*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];
}
}
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 ;
}