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("
");
                    
                    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);
        }
        
    }

}