50 lines
1.0 KiB
JavaScript
50 lines
1.0 KiB
JavaScript
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/**
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* 游戏开始菜单
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**/
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var Menu = function(context){
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this.ctx = context;
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this.x = 0;
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this.y = SCREEN_HEIGHT;
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this.selectTank = new SelectTank();
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this.playNum = 1;
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this.times = 0;
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/**
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* 画菜单
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*/
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this.draw = function(){
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this.times ++ ;
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var temp = 0;
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if( parseInt(this.times / 6) % 2 == 0){
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temp = 0;
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}else{
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temp = this.selectTank.size;
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}
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if(this.y <= 0){
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this.y = 0;
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}else{
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this.y -= 5;
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}
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this.ctx.clearRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
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this.ctx.save();
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//画背景
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this.ctx.drawImage(MENU_IMAGE, this.x, this.y);
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//画选择坦克
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this.ctx.drawImage(RESOURCE_IMAGE,POS["selectTank"][0],POS["selectTank"][1] + temp,this.selectTank.size,this.selectTank.size,
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this.selectTank.x,this.y + this.selectTank.ys[this.playNum-1],this.selectTank.size,this.selectTank.size);
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this.ctx.restore();
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};
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/**
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* 选择坦克上下移动
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*/
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this.next = function(n){
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this.playNum += n;
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if(this.playNum > 2){
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this.playNum = 1;
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}else if(this.playNum < 1){
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this.playNum = 2;
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}
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};
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};
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