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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