網頁遊戲地圖移動顯示原理學習系列二

  現在我們接着上一次遊戲地圖繼續分析地圖吧，我把部分源碼貼出來一一分析。其主線是先加載我們地圖編輯器編好的地圖XML文件，然後根據XML初始化地圖，最後初始化遊戲中行走的人物：

      createHandler---->initMap---->manLoaded。

 

      /**

      * @DescAuthor: luodongfu

      * @Desc:通過http請求文件地圖文件，下載完成由initMap初始化。很簡單，沒有好說的

     **/

    private function createHandler(evet:Event):void{
    _mapXmlSrc = "data/maps/demo1.xml";
    var loader:URLLoader = new URLLoader(new URLRequest(_mapXmlSrc));
    loader.addEventListener(Event.COMPLETE,initMap);
   }

 

   /**

  *DescAuthor: luodongfu

  *Desc:初始化地圖完成並開始通過Http請求下載人物圖片，我們的重點是分析地圖如何初始化的GameMap。

  **/

   private function initMap(evet:Event):void{
        var mapXml:XML = new XML(evet.target.data);
       _map = new GameMap(mapXml,this);
       mapCanvs.addChild(_map);
       _plaerLoader = new ImageLoader();
      _plaerLoader.load("images/woman.png");
       _plaerLoader.addEventListener(Event.COMPLETE,manLoaded);
    }

 

/**

  *DescAuthor: luodongfu

  *Desc:人物圖片下載完成，開始在地圖上初始化人物顯示

  **/

  private function manLoaded(evet:Event):void{
    var _bitMap:Bitmap = new Bitmap(_plaerLoader._data);
    _player = new HeptaFishCharacter(_bitMap,true,10,5,2,0,0,1,0);
    _player.name = "player";
    _map.addPlayer(_player);
    _map.addEventListener(MouseEvent.CLICK,_map.onClick);
   }

 

      好了，我們的重點來了。我們說說如何初始化地圖吧，可以重點分析類GameMap（它是即成自自定義類BaseDisplayObject）,  這裏我先貼出該類的變量，這樣下面代碼就好理解了：

   

   private var _player:HeptaFishCharacter;//人物
  private var _mapWidth:Number;//地圖寬度
  private var _mapHeight:Number;//地圖高度
  private var _cellWidth:Number;//地圖單元格寬度
  private var _cellHeight:Number;//地圖單元格高度
  private var _itemArr:Array;//地圖元件數組
  private var _mapArr:Array;//地圖信息數組
  private var _mapDArr:Array;//地圖直角座標數組
  private var _mapXML:XML;//地圖信息XMl
  private var _row:int;//縱向節點數
  private var _col:int;//橫向節點數
  private var _pathIndex:int;//可以行走的路徑
  private var _mapLayer:MapLayer;//地圖層
  private var _buildLayer:BuildingLayer;//建築層
  private var _gridLayer:GridLayer;//網格層
  private var _roadPointLayer:RoadPointLayer;//路點層
  private var _initPlayerPoint:Point;//初始時人物座標

 

  OK,我們再來看看地圖XML文件內容：

生成的xml地圖數據參數說明：
item節點：地圖元件
id：標示
file：顯示圖片
type：元件類型
xoffset：橫向偏移量
yoffset：縱向偏移量
px：像素座標X
py：像素座標Y
ix：邏輯索引座標X
iy：邏輯索引座標Y
walkable：可移動區域
map節點：整個地圖的root節點
filename：顯示圖片
name：地圖名稱
mapwidth：地圖寬度
mapheight：地圖高度
loadType：加載類型（整塊、柵格）
roadType：空白區域方式（路點、障礙）

<map filename="images/maps/bk.jpg" name="demo1" mapwidth="3660" mapheight="1658" loadType="0" roadType="0">

這是一個110行*61列的地圖，1表示要在地圖背景上放東西（各個建築點），0表示無東西
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  <items>
    <item id="0" file="images/城市建築/髮型店.png" type="building" xoffset="-13" yoffset="22" px="317" py="-23" ix="9" iy="8">
      <walkable>210,165,180,180,240,180,150,195,210,195,270,195,120,210,180,210,240,210,300,210,90,225,150,225,210,225,270,225,330,225,60,240,120,240,180,240,240,240,300,240,360,240,90,255,150,255,210,255,270,255,330,255,390,255,120,270,180,270,240,270,300,270,360,270,420,270,150,285,210,285,270,285,330,285,390,285,450,285,180,300,240,300,300,300,360,300,420,300,480,300,210,315,270,315,330,315,390,315,450,315,510,315,240,330,300,330,360,330,420,330,480,330,540,330,270,345,330,345,390,345,450,345,510,345,570,345,300,360,360,360,420,360,480,360,540,360,330,375,390,375,450,375,510,375,360,390,420,390,480,390,390,405,450,405,420,420</walkable>
    </item>
    <item id="1" file="images/城市建築/民房1.png" type="building" xoffset="55" yoffset="24" px="-65" py="144" ix="1" iy="20">
      <walkable>180,180,150,195,210,195,180,210,240,210,210,225</walkable>
    </item>

 </items>
</map>

 

/**

  *DescAuthor: luodongfu

  *Desc:讀取XML文件，初始化地圖各個屬性

  **/

public function GameMap(mapXML:XML,app:Application,playerPoint:Point = null)
  {
   this._app = app;
   _mapXML = mapXML;
   this.name = _mapXML.@name;
   _initPlayerPoint = playerPoint||new Point(30,80);
   _mapWidth = _mapXML.@mapwidth;地圖寬度
   _mapHeight = _mapXML.@mapheight; //地圖高度
   _cellWidth = _mapXML.floor.@tileWidth  ;//每個地圖小單元的寬度

 _cellHeight = _mapXML.floor.@tileHeight;
   _mapArr = GameMapUtils.getArrByStr(_mapXML.floor,_mapXML.floor.@col,_mapXML.floor.@row);
   _row = _mapArr.length;
   _col = _mapArr[0].length;
   _mapDArr = GameMapUtils.getDArrayByArr(_mapArr,_row,_col,_roadMap);
   _roadSeeker = new RoadSeeker(_mapDArr,_cellWidth,_cellHeight*2);
   initMap();
  }

 

/**

  *DescAuthor: luodongfu

  *Desc:開始真正的初始化了這裏

  **/
  private function initMap():void{
   _mapLayer = new MapLayer(this);
   addChild(_mapLayer);
   _buildLayer = new BuildingLayer(this);
   addChild(_buildLayer);
   _mapLayer.addEventListener(Event.COMPLETE,mapLayerLoaded);
   _mapLayer.load();
   _buildLayer.drawByXml(_mapXML);
  }

 

好了，這次我們就說到這裏吧。下次繼續