/// <summary>
/// Converts grid to a shapefile, removing any existing shapefile.
/// Assumed to be an integer grid. Adds attribute headed id with the grid values, and
/// attribute headed "Area" with the area for each polygon.
/// </summary>
/// <param name="gridName">Path of input grid</param>
/// <param name="shapeName">Path of output shapefile</param>
/// <param name="id">String to use for name of grid values attribute</param>
/// <param name="cb">Callback for reporting errors</param>
/// <returns>null if any errors, else shapefile</returns>
public static MapWinGIS.Shapefile GridToShapeManhattan(string gridName, string shapeName,
string id, MapWinGIS.ICallback cb)
{
if (!System.IO.File.Exists(gridName))
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.nogrid + gridName);
}
return(null);
}
MapWinGIS.Grid grid = new MapWinGIS.GridClass();
if (!grid.Open(gridName, GridDataType.UnknownDataType, true, GridFileType.UseExtension, null))
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noopengrid + gridName);
}
return(null);
}
MapWinGIS.GridHeader header = grid.Header;
int numRows = header.NumberRows;
int numCols = header.NumberCols;
MapWinGeoProc.DataManagement.DeleteShapefile(ref shapeName);
string oldProj = System.IO.Path.ChangeExtension(gridName, ".prj");
string newProj = System.IO.Path.ChangeExtension(shapeName, ".prj");
if (System.IO.File.Exists(oldProj) && !oldProj.Equals(newProj))
{
System.IO.File.Copy(oldProj, newProj);
}
MapWinGIS.Shapefile shapeFile = new MapWinGIS.Shapefile();
bool success = shapeFile.CreateNew(shapeName, ShpfileType.SHP_POLYGON);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.nocreateshapefile + shapeName);
}
return(null);
}
success = shapeFile.StartEditingShapes(true, null);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noeditshapefile + shapeName);
}
return(null);
}
ManhattanShapes shapes = new ManhattanShapes(header);
for (int i = 0; i < numRows; i++)
{
shapes.addGridRow(grid, i, numCols);
}
if (!shapes.lastError.Equals(""))
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", shapes.lastError);
}
return(null);
}
grid.Close();
shapes.FinishShapes();
MapWinGIS.Field idField = new MapWinGIS.Field();
idField.Name = id;
idField.Type = FieldType.INTEGER_FIELD;
int idIndex = 0;
success = shapeFile.EditInsertField(idField, ref idIndex, null);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noaddfield + shapeName);
}
shapeFile.Close();
return(null);
}
MapWinGIS.Field areaField = new MapWinGIS.Field();
areaField.Name = "Area";
areaField.Type = FieldType.DOUBLE_FIELD;
int areaIndex = 1;
success = shapeFile.EditInsertField(areaField, ref areaIndex, null);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noaddfield + shapeName);
}
shapeFile.Close();
return(null);
}
int shapeIndex = 0;
foreach (int k in shapes.ShapesTable.Keys)
{
success = shapes.InsertShape(shapeFile, k, ref shapeIndex);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noaddshape + shapeName);
}
shapeFile.Close();
return(null);
}
success = shapeFile.EditCellValue(idIndex, shapeIndex, k);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noeditcell + shapeName);
}
shapeFile.Close();
return(null);
}
double area = shapes.Area(k);
success = shapeFile.EditCellValue(areaIndex, shapeIndex, area);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noeditcell + shapeName);
}
shapeFile.Close();
return(null);
}
}
success = shapeFile.StopEditingShapes(true, true, null);
if (!success)
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.noeditshapefile + shapeName);
}
shapeFile.Close();
return(null);
}
if (!shapeFile.Close())
{
if (cb != null)
{
cb.Error("GridToShapeManhattan", clsUtils.ManhattanShapes.nocloseshapefile + shapeName);
}
return(null);
}
return(shapeFile);
}