ArcGIS 9.0 绘制扇形

我不多写了。。网上现有的代码算法有问题。把代码放上来，需要的同志可以参考。

 IFeatureClass featureClass =GetLayerByName("摄像头").FeatureClass;
                    IFeature featureForDraw;
                       
                    IFeatureCursor tmpcur =Base.QueryElement(featureClass,"");
                                   
                    while(true)
                    {
                        featureForDraw = tmpcur.NextFeature();  //得到对象

                        if(featureForDraw!=null)
                        {
                            ISimpleFillSymbol  pointSymbol = new SimpleFillSymbolClass();
                            pointSymbol.Style = ESRI.ArcGIS.Display.esriSimpleFillStyle.esriSFSNull;
                       
   
                            pointSymbol.Color = Base.GetRGBColor(255,0,0);
                           
                            ILineSymbol linesymbol=new SimpleLineSymbolClass();
                        
                            linesymbol.Width=1.1;
                            linesymbol.Color=Base.GetRGBColor(255,0,0);
                   
                           
                       

                            pointSymbol.Outline=linesymbol;

                           

                            IPoint p=featureForDraw.ShapeCopy as IPoint;
                            //这里用了属性查询，用到前面得到的对象的主字段值。
                            //IRubberBand pRubberBand=new  RubberCircleClass();
                            ESRI.ArcGIS.Geometry.IConstructCircularArc con=new CircularArcClass();

                          
                            double FW=40.0;
                            double  zj=0.01; //直径
                            double  jd=1.414;
                   
                            string _fw=featureForDraw.get_Value(featureForDraw.Fields.FindField("SP_ANGLE")).ToString().Trim();
                            if(_fw!=string.Empty)
                            {
                                FW=double.Parse(_fw);
                            }
                   
                            string  _zj=featureForDraw.get_Value(featureForDraw.Fields.FindField("BOUND")).ToString().Trim();
                            if(_zj!=string.Empty)
                            {
                                zj=double.Parse(_zj);
                            }

                            try
                            {
                              
                                //con.ConstructCircle(p,System.Convert.ToDouble(bound_str)/2000,false);
                           
                                ESRI.ArcGIS.Geometry.ICircularArc cir=new CircularArcClass();
                                cir=con as ICircularArc;
                               
                             
                            //重点
                                 cir.PutCoordsByAngle(p,FW*Math.PI/180,40*Math.PI/180,zj);

                                IPoint 起始点=cir.FromPoint;
                                IPoint 结束点=cir.ToPoint;

                                ILine line=new LineClass();
                                ILine line1=new LineClass();
                                line.PutCoords(p,起始点);
                                line1.PutCoords(结束点,p);

   
                                ISegmentCollection  polygon   = new PolygonClass();

                                object Missing  = Type.Missing;

                                polygon.AddSegment(line as ISegment,ref Missing,ref Missing);
                                polygon.AddSegment(cir as ISegment,ref Missing,ref Missing);
                                polygon.AddSegment(line1 as ISegment,ref Missing,ref Missing);

                                IGeometry geometry   =polygon as IGeometry;
                               
                                       
                                object tmpSymbol=(object)pointSymbol;
                                axMapControl1.DrawShape (geometry,ref tmpSymbol);
                               
                            }
                            catch
                            {
                           
                            }
                           
                        }
                        else
                        {
                            break;
                        }
                    }
                }
                catch(Exception ex)
                {
                    System.Console.WriteLine(ex.Message);
                }

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