flex中在地图上绘制点（遍历数组坐标）

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?? //定义图层
???private var labelGraLayer:GraphicsLayer=new GraphicsLayer();?

在方法中写：

???? var trw:TrWushuikouCols=new TrWushuikouCols()
?????var ss:Array=TrWushuikouCols.rowcol;
?????var c:Number=ss.length;//定义循环次数
?????labelGraLayer.clear();//清空
?????map.addLayer(labelGraLayer);//加载图层
?????for(var i:int=0;i<c;i++)
?????{
??????var obj:Object=ss[i] as Object;????????
??????var point:MapPoint=new MapPoint(obj.row,obj.col);
??????var symbol:PictureMarkerSymbol=new PictureMarkerSymbol("assets/i_pin.png",30,0);
??????var graphic:Graphic=new Graphic(point,symbol);
??????labelGraLayer.add(graphic);
?????}

?????if(map) ??????map.centerAt(point);