Flex 加载dxf

因为已经写过加载dwg了，dxf应该不陌生，dxf是个开源格式，所以加载比较简单这里直接附上as的代码，但是真正使用场景还是比较少，dwg文件比较多

 package widgetscadastre.SZ_ImportCAD
 {
     /**
      * ...
      * @author haibalai
      */
     import com.esri.ags.Graphic;
     import com.esri.ags.geometry.Extent;
     import com.esri.ags.geometry.MapPoint;
     import com.esri.ags.geometry.Polygon;
     import com.esri.ags.geometry.Polyline;
     import com.szpl.extension.base.impl.AccessPoint;
     import flash.events.Event;
     import flash.net.FileFilter;
     import flash.net.FileReference;
     import flash.utils.Dictionary;

     import mx.collections.ArrayCollection;
     import mx.controls.Alert;
     import mx.utils.ObjectUtil;
     import mx.utils.StringUtil;

     public class DxfTool
     {

         public function DxfTool()
         {

         }

         [Bindable]
         private var layerList:ArrayCollection = null;

         private var coorArray:Array = null;
         private var initExtent:Extent = null;

         private var _callFun:Function;
         public function dxfLoad(bytedata:String,callFun:Function = null)
         {
             _callFun = callFun;
             dxfHandle(bytedata);

         }

         private function dxfHandle(coorStr:String):void
         {

                 layerList = new ArrayCollection;
                 try
                 {

                     coorArray = StringUtil.trim(coorStr).split("\r\n");

                     var i:int=0;  //当前读取的行数
                     var entitiesRowNum:int = 0; //实体所在行数
                     initExtent = new Extent;

                     while(i<coorArray.length)
                     {
                         if(StringUtil.trim(coorArray[i]).toUpperCase()=="$LIMMIN")   //读取地图范围
                         {
                             i = i + 2;
                             initExtent.xmin = Number(StringUtil.trim(coorArray[i]));  //最小x
                             i = i + 2;
                             initExtent.ymin = Number(StringUtil.trim(coorArray[i]));  //最小y
                         }
                         else if(StringUtil.trim(coorArray[i]).toUpperCase()=="$LIMMAX")
                         {
                             i = i + 2;
                             initExtent.xmax = Number(StringUtil.trim(coorArray[i]));  //最大x
                             i = i + 2;
                             initExtent.ymax = Number(StringUtil.trim(coorArray[i]));  //最大y
                         }
                         else if(StringUtil.trim(coorArray[i]).toUpperCase()=="ENTITIES")
                         {
                             entitiesRowNum=i;  //记录实体所在行位置
                             i++;
                             break;
                         }
                         i++;
                     }

                     var dictionary:Dictionary = new Dictionary;
                     //加载图层
                     while(i<coorArray.length)
                     {
                         if(StringUtil.trim(coorArray[i])=="8") //读取到图层
                         {
                             i++;
                             if (dictionary[StringUtil.trim(coorArray[i])]==null) //判断图层是否存在
                             {
                                 var obj:Object = {name:StringUtil.trim(coorArray[i]), RowNum:i};  //图层名及图层所在行数
                                 dictionary[StringUtil.trim(coorArray[i])]=obj;
                                 this.layerList.addItem(obj);
                             }

                             i++;
                         }
                         if(StringUtil.trim(coorArray[i])=="")  //遇到空行则终止循环
                         {
                             i++;
                             break;
                         }
                         i++;
                     }
                 }
                 catch(e:Error)
                 {
                     Alert.show("读取有误:"+e.message.toString());
                 }
                 loadLayer()

         }

         private function loadLayer():void
         {
             var coord:String = "";
             var graphicArr:Array = new Array();
             if(layerList!=null)
             {
                 for (var j:int = 0; j < layerList.length; j++ )
                 {

                     var layerObj:Object = layerList[j];
                     var i:Number = layerObj.RowNum; //当前图层所在行数
                     while(i < coorArray.length)
                     {
                         if(StringUtil.trim(coorArray[i]) == layerObj.name)  //找到对应图层
                         {
                             i++;
                             while(i<coorArray.length)
                             {
                                 if(StringUtil.trim(coorArray[i])=="100")
                                 {
                                     i++;
                                     break;
                                 }
                                 i++;
                             }

                             switch(StringUtil.trim(coorArray[i]))
                             {
                                 case "AcDbPolyline":
                                 {
                                     i = i + 2;
                                     var iNodeCount:Number = Number(StringUtil.trim(coorArray[i]));  //顶点个数
                                     i = i + 2;
                                     var geomeryType:String = StringUtil.trim(coorArray[i]); //图形类型

                                     i = i + 2;
                                     var pointArray:Array = new Array;

                                     while(pointArray.length < iNodeCount)
                                     {
                                         var mapPoint:MapPoint = new MapPoint;
                                         i = i + 2;

                                         mapPoint.x = Number(StringUtil.trim(coorArray[i]));   //x坐标
                                         i = i + 2;

                                         mapPoint.y = Number(StringUtil.trim(coorArray[i]));   //y坐标

                                         pointArray.push(mapPoint);

                                     }
                                     if(geomeryType == "0")   //  0代表折线
                                     {
                                         //var paths:Array = new Array;
                                         //paths.push(pointArray);
                                         //
                                         //var polyline:Polyline = new Polyline;
                                         //polyline.paths = paths;
                                         //
                                         //var gra:Graphic = new Graphic;
                                         //gra.geometry = polyline;

                                     }
                                     else if(geomeryType == "1")  //  1代表折线闭合为多边形
                                     {
                                         var rings:Array = new Array;
                                         rings.push(pointArray);

                                         var polygon:Polygon = new Polygon;
                                         polygon.rings = rings;

                                         var graphic:Graphic = new Graphic;
                                         graphic.geometry = polygon;
                                         graphicArr.push(graphic);

                                     }
                                     break;
                                 }
                                 case "AcDbLine":
                                     break;
                                 case "AcDbPoint":
                                     break;
                                 case "AcDbSpline":

                                     break;
                             }
                             i++;
                         }
                         else
                         {
                             i++;
                         }
                     }

                 }

             }
             if (graphicArr.length > 0)
             {
                 for each(var graphic:Graphic  in graphicArr)
                 {
                     coord += AccessPoint.exchange.polygon_to_CoordText(graphic.geometry as Polygon) + "*";
                 }
                 coord = coord.substring(0,coord.length - 1)

             }

             _callFun.call(null, coord);
         }

     }

 }