private Polygon EditPolygon(Polygon polygon, IGeometryEdit operation)
{
Polygon newPolygon = (Polygon)operation.Edit(polygon, m_objFactory);
if (newPolygon.IsEmpty)
{
//RemoveSelectedPlugIn relies on this behaviour. [Jon Aquino]
return(newPolygon);
}
LinearRing shell = (LinearRing)Edit(newPolygon.ExteriorRing, operation);
if (shell.IsEmpty)
{
//RemoveSelectedPlugIn relies on this behaviour. [Jon Aquino]
return(m_objFactory.CreatePolygon(null, null));
}
GeometryList holes = new GeometryList();
for (int i = 0; i < newPolygon.NumInteriorRings; i++)
{
LinearRing hole = (LinearRing)Edit(newPolygon.InteriorRing(i), operation);
if (hole.IsEmpty)
{
continue;
}
holes.Add(hole);
}
return(m_objFactory.CreatePolygon(shell, holes.ToLinearRingArray()));
}
/// <summary>
/// Edit the input <see cref="Geometry"/> with the given edit operation.
/// Clients will create subclasses of <see cref="IGeometryEdit"/> or
/// <see cref="CoordinateGeometryEdit"/> to perform required modifications.
/// </summary>
/// <param name="geometry">The Geometry to edit</param>
/// <param name="operation">The edit operation to carry out.</param>
/// <returns>A new Geometry which is the result of the editing.</returns>
public virtual Geometry Edit(Geometry geometry, IGeometryEdit operation)
{
if (geometry == null)
{
throw new ArgumentNullException("geometry");
}
if (operation == null)
{
throw new ArgumentNullException("operation");
}
// if client did not supply a GeometryFactory, use the one from the input Geometry
if (m_objFactory == null)
{
m_objFactory = geometry.Factory;
}
GeometryType geomType = geometry.GeometryType;
if (geomType == GeometryType.GeometryCollection)
{
return(EditGeometryCollection((GeometryCollection)geometry, operation));
}
if (geomType == GeometryType.Polygon)
{
return(EditPolygon((Polygon)geometry, operation));
}
if (geomType == GeometryType.Point)
{
return(operation.Edit(geometry, m_objFactory));
}
if (geomType == GeometryType.LineString ||
geomType == GeometryType.LinearRing)
{
return(operation.Edit(geometry, m_objFactory));
}
Debug.Assert(false, "Should never reach here: Unsupported Geometry classes should be caught in the IGeometryEdit.");
return(null);
}
private GeometryCollection EditGeometryCollection(GeometryCollection collection,
IGeometryEdit operation)
{
GeometryCollection newCollection =
(GeometryCollection)operation.Edit(collection, m_objFactory);
GeometryList geometries = new GeometryList();
for (int i = 0; i < newCollection.NumGeometries; i++)
{
Geometry geometry = Edit(newCollection.GetGeometry(i), operation);
if (geometry.IsEmpty)
{
continue;
}
geometries.Add(geometry);
}
GeometryType geomType = newCollection.GeometryType;
if (geomType == GeometryType.MultiPoint)
{
return(m_objFactory.CreateMultiPoint(geometries.ToPointArray()));
}
if (geomType == GeometryType.MultiLineString)
{
return(m_objFactory.CreateMultiLineString(
geometries.ToLineStringArray()));
}
if (geomType == GeometryType.MultiPolygon)
{
return(m_objFactory.CreateMultiPolygon(geometries.ToPolygonArray()));
}
return(m_objFactory.CreateGeometryCollection(geometries.ToArray()));
}
