Egret学习笔记 (Egret打飞机-6.实现敌机飞起来)

class EnemyPlane extends egret.DisplayObjectContainer {
  _enemy: egret.Bitmap;
  _timer: egret.Timer;
  _speed: number = 2;
  _tyle: EnemyType = EnemyType.SMALL;
  /**
   * 是否使用
   */
  public IsUse: boolean = false;
  _main: Main;
  public constructor(main: Main, type: EnemyType) {
    super();
    this._main = main;
    this._tyle = type;
    this._enemy = new egret.Bitmap();
    this.addChild(this._enemy);
    this.addEventListener(egret.Event.ADDED_TO_STAGE, () => {
    }, this)
  }
  /**
   * 使用
   */
  public Use() {
    this.IsUse = true;
    //判断类型
    this.y = -this.height; //初始化飞机的位置为屏幕外
    this._main.addChildAt(this, 10)
    this.addEventListener(egret.Event.ENTER_FRAME, this.frame, this)
  }
  /**
   * 回收
   */
  public Recycle() {
    console.log("敌机回收-----")
    this.IsUse = false;
    this._main.removeChild(this);
    this.removeEventListener(egret.Event.ENTER_FRAME, this.frame, this)
  }
  frame() {
    console.log("EnemyPlane Frame")
    if (this.IsUse) {
      this.y += this._speed;
      if (this.y >= GameConfig.SceneH) {
        //从父节点中移除
        if (this.parent) {
          this.parent.removeChild(this);
          this.Recycle();
        }
      }
    }
  }
}
/**
 * 敌机类型
 */
enum EnemyType {
  /**
   * 大飞机
   */
  BIG = 1,
  /**
   * 小飞机
   */
  SMALL = 0,
        /**
   * 特别小的飞机
   */
  VERSCHWINDENDSMALL = 2
}

class SmallEnemyPlane extends EnemyPlane {
  public constructor(main: Main) {
    super(main, EnemyType.SMALL);
    this.width = 69;
    this.height = 89;
    this._enemy.texture = RES.getRes("enemy2_png");
    this.addEventListener(egret.Event.ADDED_TO_STAGE, () => {
    }, this)
  }
}

var small = new SmallEnemyPlane(this)
small.Use();