var momObj = function(){
this.x ;//坐标
this.y ;
this.bigEye = new Image();//鱼的眼睛
this.bigBody = new Image();//鱼的身体
this.bigTail = new Image();//鱼的尾巴
}
momObj.prototype.init = function(){
this.x = canWidth * 0.5;
this.y = canHeight * 0.5;
this.bigEye.src = "./src/bigEye0.png";
this.bigBody.src = "./src/bigSwim0.png";
this.bigTail.src = "./src/bigTail0.png";
}
momObj.prototype.draw = function(){
ctx1.save();
ctx1.translate(this.x,this.y);/*方法转换画布的用户坐标系统。平移，将画布的坐标原点向左右方向移动x，向上下方向移动y.canvas的默认位置是在（0,0）*/
ctx1.drawImage(this.bigEye,-this.bigEye.width*0.5,-this.bigEye.height*0.5);
ctx1.drawImage(this.bigBody,-this.bigBody.width*0.5,-this.bigBody.height*0.5);
ctx1.drawImage(this.bigTail,-this.bigTail.width*0.5+30,-this.bigTail.height*0.5);
ctx1.restore();
} |
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