//大魚 API translate();rotate()旋轉.angle指旋轉的角度，順時針旋轉;Math.atan2(y,x);

var momObj = function(){

this.x ;//坐標

this.y ;

this.bigEye = new Image();//魚的眼睛

this.bigBody = new Image();//魚的身體

this.bigTail = new Image();//魚的尾巴

}

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);/*方法轉換畫布的用戶坐標系統。平移，將畫布的坐標原點向左右方向移動x，向上下方向移動y.canvas的默認位置是在（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();

}