SuperMap二次开发：C#实现空间量算

 private void toolStripButton5_Click(object sender, EventArgs e)
        {
            axSuperMap1.TrackingLayer.ClearEvents();
           
            axSuperMap1.selection.RemoveAll();
            axSuperMap1.TrackingLayer.Refresh();
            this.axSuperMap1.Action = seAction.scaTrackPolyline;
        }

        private void axSuperMap1_Tracked(object sender, EventArgs e)
        {
            soGeometry objSearchGeo = axSuperMap1.TrackedGeometry;
            soDatasetVector objDtv;//矢量数据集
            if (objSearchGeo == null)
            {
                MessageBox.Show("未获得用于搜索的对象", "提示");
                return;
            }
            soStyle objStyle = new soStyleClass();
            objStyle.PenColor = (uint)ColorTranslator.ToOle(Color.Red);
            axSuperMap1.TrackingLayer.AddEvent(objSearchGeo, objStyle, "");

            objDtv = (SuperMapLib.soDatasetVector)axSuperWorkspace1.Datasources["World"].Datasets["Countries"];
            soRecordset objSearchRd;
           
           objSearchRd = objDtv.QueryEx(objSearchGeo, seSpatialQueryMode.scsLineCross, "");

                

            if (objSearchRd.RecordCount == 0)