网页游戏map移动显示原理学习系列二

网页游戏地图移动显示原理学习系列二

? 现在我们接着上一次游戏地图继续分析地图吧，我把部分源码贴出来一一分析。其主线是先加载我们地图编辑器编好的地图XML文件，然后根据XML初始化地图，最后初始化游戏中行走的人物：

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

?

???? ?/**

????? * @DescAuthor: luodongfu

??????* @Desc:通过http请求文件地图文件，下载完成由initMap初始化。很简单，没有好说的

???? **/

??? 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:初始化地图完成并开始通过Http请求下载人物图片，我们的重点是分析地图如何初始化的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:人物图片下载完成，开始在地图上初始化人物显示

? **/

? 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，我们的重点来了。我们说说如何初始化地图吧，可以重点分析类GameMap（它是即成自自定义类BaseDisplayObject）,? 这里我先贴出该类的变量，这样下面代码就好理解了：

???

???private var _player:HeptaFishCharacter;//人物
??private var _mapWidth:Number;//地图宽度
??private var _mapHeight:Number;//地图高度
??private var _cellWidth:Number;//地图单元格宽度
??private var _cellHeight:Number;//地图单元格高度
??private var _itemArr:Array;//地图元件数组
??private var _mapArr:Array;//地图信息数组
??private var _mapDArr:Array;//地图直角坐标数组
??private var _mapXML:XML;//地图信息XMl
??private var _row:int;//纵向节点数
??private var _col:int;//横向节点数
??private var _pathIndex:int;//可以行走的路径
??private var _mapLayer:MapLayer;//地图层
??private var _buildLayer:BuildingLayer;//建筑层
??private var _gridLayer:GridLayer;//网格层
??private var _roadPointLayer:RoadPointLayer;//路点层
??private var _initPlayerPoint:Point;//初始时人物坐标

?

? OK,我们再来看看地图XML文件内容：

生成的xml地图数据参数说明：
item节点：地图元件
id：标示
file：显示图片
type：元件类型
xoffset：横向偏移量
yoffset：纵向偏移量
px：像素坐标X
py：像素坐标Y
ix：逻辑索引坐标X
iy：逻辑索引坐标Y
walkable：可移动区域
map节点：整个地图的root节点
filename：显示图片
name：地图名称
mapwidth：地图宽度
mapheight：地图高度
loadType：加载类型（整块、栅格）
roadType：空白区域方式（路点、障碍）

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

这是一个110行*61列的地图，1表示要在地图背景上放东西（各个建筑点），0表示无东西
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? <items>
??? <item id="0" file="images/城市建筑/发型店.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/城市建筑/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:读取XML文件，初始化地图各个属性

? **/

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;;//地图宽度
???_mapHeight = _mapXML.@mapheight; //地图高度
???_cellWidth = _mapXML.floor.@tileWidth??;//每个地图小单元的宽度

?_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:开始真正的初始化了这里

? **/
??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，这次我们就说到这里吧。下次继续