Arcgis处理拓扑

　　子多边形增加方向，符合拓扑规则：

 

　　private void shp要素ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {

 

                ILayer pLayer = m_mapControl.get_Layer(0);
                IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer;
                IFeature tmpFea = pFeatureLayer.FeatureClass.CreateFeature();
                IPolygon pPolygon = new PolygonClass();
                pPolygon = fun() as IPolygon;

　　　　　　//图形增加方向

                ITopologicalOperator pTopo = pPolygon as ITopologicalOperator;
                pTopo.Simplify();
                if (pPolygon == null) return;

 

                tmpFea.Shape = pPolygon;
                tmpFea.Store();
            }
            catch (Exception err)
            {

            }    
        }
        IGeometry fun()
        {

            //创建一个Ring对象

            ISegmentCollection pSegCollection = new RingClass();

            IPoint pt1 = new PointClass();
            pt1.X = 0;
            pt1.Y = 0;

            IPoint pt2 = new PointClass();
            pt2.X = 1;
            pt2.Y = 0;
            IPoint pt3 = new PointClass();
            pt3.X = 1;
            pt3.Y = 1;

            IPoint pt4 = new PointClass();
            pt4.X = -2;
            pt4.Y = -1;
            IPoint pt5 = new PointClass();
            pt5.X = 2;
            pt5.Y = -1;
            IPoint pt6 = new PointClass();
            pt6.X = 2;
            pt6.Y = 2;
            object o = Type.Missing;

            IPointCollection ptC1 = new RingClass() as IPointCollection;
            ptC1.AddPoint(pt1,ref o ,ref o);
            ptC1.AddPoint(pt2, ref o, ref o);
            ptC1.AddPoint(pt3, ref o, ref o);
            ptC1.AddPoint(pt1, ref o, ref o);

            IPointCollection ptC2 = new RingClass() as IPointCollection;
            ptC2.AddPoint(pt4, ref o, ref o);
            ptC2.AddPoint(pt5, ref o, ref o);
            ptC2.AddPoint(pt6, ref o, ref o);
            ptC2.AddPoint(pt4, ref o, ref o);

            (ptC1 as IRing).Close();
            (ptC2 as IRing).Close();

            IGeometryCollection pGeometryColl = new PolygonClass();
            pGeometryColl.AddGeometry(ptC1 as IRing, ref o, ref o);

            pGeometryColl.AddGeometry(ptC2 as IRing, ref o, ref o);

            return pGeometryColl as IGeometry;
        }