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);

         }

     }

 }