复制graphic

for each (var curGra:Graphic in graphicslayer.graphicProvider)
                        {
                            clearBtnVisible=true;
                            var temGra:Graphic=null;
                            switch (curGra.geometry.type)
                            {
                                case Geometry.EXTENT:
                                {
                                    var tgeom:Geometry=curGra.geometry;
                                    var points:Array=new Array();
                                    var temppoint:MapPoint=new MapPoint(tgeom.extent.xmin, tgeom.extent.ymin);
                                    points.push(temppoint);
                                    temppoint=new MapPoint(tgeom.extent.xmin, tgeom.extent.ymax);
                                    points.push(temppoint);
                                    temppoint=new MapPoint(tgeom.extent.xmax, tgeom.extent.ymax);
                                    points.push(temppoint);
                                    temppoint=new MapPoint(tgeom.extent.xmax, tgeom.extent.ymin);
                                    points.push(temppoint);
                                    temppoint=new MapPoint(tgeom.extent.xmin, tgeom.extent.ymin);
                                    points.push(temppoint);

                                    var polygeo_ext:Polygon=new Polygon();
                                    polygeo_ext.addRing(points);
                                    temGra=new Graphic(polygeo_ext, curGra.symbol);
                                    break;
                                }
                                case Geometry.POLYGON:
                                {
                                    var polygeo_poly:Polygon=new Polygon();
                                    var polygeo:Polygon=curGra.geometry as Polygon;
                                    for each (var ring:Array in polygeo.rings)
                                    {
                                        var temring:Array=[];
                                        for (var i:int=0; i < ring.length; i++)
                                        {
                                            var tempt_ring:MapPoint=ring[i] as MapPoint;
                                            temring.push(new MapPoint(tempt_ring.x, tempt_ring.y));
                                        }
                                        polygeo_poly.addRing(temring);
                                    }
                                    temGra=new Graphic(polygeo_poly, curGra.symbol);
                                    break;
                                }
                                case Geometry.MAPPOINT:
                                {
                                    var mpt_tem:MapPoint=curGra.geometry as MapPoint;
                                    temGra=new Graphic(new MapPoint(mpt_tem.x, mpt_tem.y), curGra.symbol, curGra.attributes);
                                    break;
                                }
                                case Geometry.POLYLINE:
                                {
                                    var polylinegeo_poly:Polyline=new Polyline();
                                    var polylinegeo:Polyline=curGra.geometry as Polyline;
                                    for each (var path:Array in polylinegeo.paths)
                                    {
                                        var tempath:Array=[];
                                        for (var j:int=0; j < path.length; j++)
                                        {
                                            var tempt_path:MapPoint=path[j] as MapPoint;
                                            tempath.push(new MapPoint(tempt_path.x, tempt_path.y));
                                        }
                                        polylinegeo_poly.addPath(tempath);
                                    }
                                    temGra=new Graphic(polylinegeo_poly, curGra.symbol);
                                    break;
                                }
                            }

                            temGra.autoMoveToTop=false;
                            graLyr.add(temGra);
                        }