javascript制作坦克大战全纪录（1）(3)

// 创建玩家坦克,继承自tank对象
SelfTank = function () {
    this.UI = UtilityClass.CreateE("div", "", "itank", document.getElementById("divMap"));
    this.MovingState = false;
    this.Speed = 4;
}
SelfTank.prototype = new Tank();
// 设置坦克的位置
SelfTank.prototype.UpdateUI = function () {
    this.UI.className = "itank";
    // 顶级对象方法，设置坦克的位置
    this.SetPosition(this.XPosition * 40, this.YPosition * 40);
}

现在只创建了玩家坦克，后面我们还会往里添加敌人坦克。

1.2.5    创建游戏装载对象(核心)

复制代码 代码如下:

 // 游戏载入对象 整个游戏的核心对象
 GameLoader = function () {
     this.mapContainer = document.getElementById("divMap");  // 存放游戏地图的div
     this._selfTank = null;  // 玩家坦克
     this._gameListener = null; // 游戏主循环计时器id
 }
 GameLoader.prototype = {
     Begin: function () {
         // 初始化玩家坦克
         var selfT = new SelfTank();
         selfT.XPosition = 4;
         selfT.YPosition = 12;
         selfT.UpdateUI();
         this._selfTank = selfT;
         // 添加按键事件
         var warpper = UtilityClass.BindFunction(this, this.OnKeyDown);
         window.onkeydown = document.body.onkeydown = warpper;
         warpper = UtilityClass.BindFunction(this, this.OnKeyUp);
         window.onkeyup = document.body.onkeyup = warpper;
         // 游戏主循环
         warpper = UtilityClass.BindFunction(this, this.Run);
         /*长定时器监听控制键*/
         this._gameListener = setInterval(warpper, 20);
     }
     // 键盘按下玩家坦克开始移动
     , OnKeyDown: function (e) {
         switch ((window.event || e).keyCode) {
             case 37:
                 this._selfTank.Direction = EnumDirection.Left;
                 this._selfTank.MovingState = true;
                 break;        //左
             case 38:
                 this._selfTank.Direction = EnumDirection.Up;
                 this._selfTank.MovingState = true;
                 break;        //上
             case 39:
                 this._selfTank.Direction = EnumDirection.Right;
                 this._selfTank.MovingState = true;
                 break;        //右
             case 40:
                 this._selfTank.Direction = EnumDirection.Down;
                 this._selfTank.MovingState = true;
                 break;        //下
         }
     }
     // 按键弹起停止移动
     , OnKeyUp: function (e) {
         switch ((window.event || e).keyCode) {
             case 37:
             case 38:
             case 39:
             case 40:
                 this._selfTank.MovingState = false;
                 break;
         }
     }
     /*游戏主循环运行函数，游戏的心脏，枢纽*/
     , Run: function () {
         if (this._selfTank.MovingState) {
             this._selfTank.Move();
         }
     }
 };