4参数坐标转换算法（面要素）

public void Polygon_Trans4(IFeatureClass pFeatureCls, string strPath, string strFilename, ProgressBar pBar) { if (pFeatureCls == null || strPath == "" || strFilename == "") return; createNewShape(strPath, strFilename, pFeatureCls); IFeatureCursor pFeat Cursor = pFeatureCls.Search(null, false); IFeature pFeature = pFeatCursor.NextFeature(); //打开目标图层 IWorkspaceFactory pWSF = new ShapefileWorkspaceFactoryClass(); IWorkspace pWS = pWSF.OpenFromFile(strPath, 0); IFeatureWorkspace pFWS = (IFeatureWorkspace)pWS; IFeatureClass pTargetFClass = pFWS.OpenFeatureClass(strFilename); IWorkspaceEdit pWSEdit = pWS as IWorkspaceEdit; pWSEdit.StartEditOperation(); pWSEdit.StartEditing(false); ITable pTble = (ITable)pFeatureCls; int lCunt = pTble.RowCount(null); pBar.Visible = true; pBar.Minimum = 0; pBar.Maximum = lCunt; pBar.Step = 1; IFeature pNewFeature; IPolygon pOutPolygon; IGeometryCollection pOutGeos; IPolygon pInPolygon; IGeometryCollection pInGeos; IPoint pOutPnt = new PointClass(); IPointCollection pOutPnts; while (pFeature != null) { pBar.PerformStep(); pNewFeature = pTargetFClass.CreateFeature(); pOutPolygon = new PolygonClass(); pOutGeos = pOutPolygon as IGeometryCollection; //获取原图形 pInPolygon = pFeature.Shape as IPolygon; pInGeos = pInPolygon as IGeometryCollection; for (int m = 0; m < pInGeos.GeometryCount; m++) { IGeometry pInGeo = pInGeos.get_Geometry(m); IPointCollection pInPnts = pInGeo as IPointCollection; pOutPnts = new PolygonClass(); object missing = Type.Missing; for (int n = 0; n < pInPnts.PointCount; n++) { IPoint pInPnt = pInPnts.get_Point(n); //转换点坐标 pOutPnt.X = ClsParas4.m_OffY + pInPnt.Y * ClsParas4.m_vb + pInPnt.X * ClsParas4.m_va; pOutPnt.Y = ClsParas4.m_OffX + pInPnt.Y * ClsParas4.m_va - pInPnt.X * ClsParas4.m_vb; pOutPnts.AddPoint(pOutPnt, ref missing, ref missing); } ISegmentCollection pSegmentCols = new RingClass(); pSegmentCols.AddSegmentCollection(pOutPnts as ISegmentCollection); pOutGeos.AddGeometry(pSegmentCols as IGeometry, ref missing, ref missing); } for (int i = 0; i < pFeature.Fields.FieldCount; i++) { if (pNewFeature.Fields.get_Field(i).Name.ToString().Equals("FID", StringComparison.CurrentCultureIgnoreCase) || pNewFeature.Fields.get_Field(i).Name.ToString().Equals("SHAPE", StringComparison.CurrentCultureIgnoreCase)) continue; pNewFeature.set_Value(i, pFeature.get_Value(i)); } pNewFeature.Shape = pOutPolygon as IGeometry; pNewFeature.Store(); pFeature = pFeatCursor.NextFeature(); } pBar.Visible = false; pWSEdit.StopEditOperation(); pWSEdit.StopEditing(true); } Cursor = pFeatureCls.Search(null, false); IFeature pFeature = pFeatCursor.NextFeature(); //打开目标图层 IWorkspaceFactory pWSF = new ShapefileWorkspaceFactoryClass(); IWorkspace pWS = pWSF.OpenFromFile(strPath, 0); IFeatureWorkspace pFWS = (IFeatureWorkspace)pWS; IFeatureClass pTargetFClass = pFWS.OpenFeatureClass(strFilename); IWorkspaceEdit pWSEdit = pWS as IWorkspaceEdit; pWSEdit.StartEditOperation(); pWSEdit.StartEditing(false); ITable pTble = (ITable)pFeatureCls; int lCunt = pTble.RowCount(null); pBar.Visible = true; pBar.Minimum = 0; pBar.Maximum = lCunt; pBar.Step = 1; IFeature pNewFeature; IPolygon pOutPolygon; IGeometryCollection pOutGeos; IPolygon pInPolygon; IGeometryCollection pInGeos; IPoint pOutPnt = new PointClass(); IPointCollection pOutPnts; while (pFeature != null) { pBar.PerformStep(); pNewFeature = pTargetFClass.CreateFeature(); pOutPolygon = new PolygonClass(); pOutGeos = pOutPolygon as IGeometryCollection; //获取原图形 pInPolygon = pFeature.Shape as IPolygon; pInGeos = pInPolygon as IGeometryCollection; for (int m = 0; m < pInGeos.GeometryCount; m++) { IGeometry pInGeo = pInGeos.get_Geometry(m); IPointCollection pInPnts = pInGeo as IPointCollection; pOutPnts = new PolygonClass(); object missing = Type.Missing; for (int n = 0; n < pInPnts.PointCount; n++) { IPoint pInPnt = pInPnts.get_Point(n); //转换点坐标 pOutPnt.X = ClsParas4.m_OffY + pInPnt.Y * ClsParas4.m_vb + pInPnt.X * ClsParas4.m_va; pOutPnt.Y = ClsParas4.m_OffX + pInPnt.Y * ClsParas4.m_va - pInPnt.X * ClsParas4.m_vb; pOutPnts.AddPoint(pOutPnt, ref missing, ref missing); } ISegmentCollection pSegmentCols = new RingClass(); pSegmentCols.AddSegmentCollection(pOutPnts as ISegmentCollection); pOutGeos.AddGeometry(pSegmentCols as IGeometry, ref missing, ref missing); } for (int i = 0; i < pFeature.Fields.FieldCount; i++) { if (pNewFeature.Fields.get_Field(i).Name.ToString().Equals("FID", StringComparison.CurrentCultureIgnoreCase) || pNewFeature.Fields.get_Field(i).Name.ToString().Equals("SHAPE", StringComparison.CurrentCultureIgnoreCase)) continue; pNewFeature.set_Value(i, pFeature.get_Value(i)); } pNewFeature.Shape = pOutPolygon as IGeometry; pNewFeature.Store(); pFeature = pFeatCursor.NextFeature(); } pBar.Visible = false; pWSEdit.StopEditOperation(); pWSEdit.StopEditing(true); }