/// <summary>
/// Removes portions of the input line shapefile that fall within the polygons of the erase polygon shapefile.
/// </summary>
/// <param name="inputSF">The line shapefile to erase.</param>
/// <param name="eraseSF">The polygon shapefile that will be used to erase portions of the line shapefile.</param>
/// <param name="resultSF">The result shapefile.</param>
/// <returns>False if an error was encountered, true otherwise.</returns>
public static bool EraseLineSFWithPolySF(ref MapWinGIS.Shapefile inputSF, ref MapWinGIS.Shapefile eraseSF, ref MapWinGIS.Shapefile resultSF)
{
MapWinUtility.Logger.Dbg("EraseLineSFWithPolySF(inputSF: " + Macro.ParamName(inputSF) + "\n" +
" eraseSF: " + Macro.ParamName(eraseSF) + "\n" +
" resultSF: " + Macro.ParamName(resultSF) + ")");
if (inputSF == null || eraseSF == null || resultSF == null)
{
gErrorMsg = "One of the input parameters is null.";
Error.SetErrorMsg(gErrorMsg);
Debug.WriteLine(gErrorMsg);
MapWinUtility.Logger.Dbg(gErrorMsg);
return(false);
}
bool status = true;
MapWinGIS.Shapefile tempInput = new MapWinGIS.ShapefileClass();
string tempFile = System.IO.Path.GetTempPath() + "tempLineResult.shp";
//CDM 8/4/2006 tempInput.CreateNew(tempFile, inputSF.ShapefileType);
Globals.PrepareResultSF(ref tempFile, ref tempInput, inputSF.ShapefileType);
tempInput.StartEditingShapes(true, null);
int shpIndex = 0;
int numInputs = inputSF.NumShapes;
for (int i = 0; i <= numInputs - 1; i++)
{
tempInput.EditInsertShape(inputSF.get_Shape(i), ref shpIndex);
shpIndex++;
}
int numErase = eraseSF.NumShapes;
for (int i = 0; i <= numErase - 1; i++)
{
Debug.WriteLine("Num shapes in tempInput = " + tempInput.NumShapes);
MapWinGIS.Shape eraseShp = new MapWinGIS.ShapeClass();
eraseShp = eraseSF.get_Shape(i);
resultSF.EditClear();
status = EraseLineSFWithPoly(ref tempInput, ref eraseShp, ref resultSF, false);
if (i != numErase - 1)
{
int numResults = resultSF.NumShapes;
if (numResults > 0)
{
tempInput.EditClear();
shpIndex = 0;
for (int j = 0; j <= numResults - 1; j++)
{
tempInput.EditInsertShape(resultSF.get_Shape(j), ref shpIndex);
shpIndex++;
}
}
}
}
MapWinUtility.Logger.Dbg("Finished EraseLineSFWithPolySF");
return(status);
}