/// <summary>
/// Creates a Polygon using the next token in the stream.
/// </summary>
/// <param name="tokenizer">
/// Tokenizer over a stream of text in Well-known Text
/// format. The next tokens must form a <Polygon Text>.
/// </param>
/// <returns>
/// A Polygon specified by the next token in the stream.
/// </returns>
/// <exception cref="GeometryIOException">
/// If the coordinates used to create the Polygon shell and holes do
/// not form closed linestrings, or if an unexpected token was
/// encountered.
/// </exception>
/// <exception cref="IOException">
/// If an I/O error occurs.
/// </exception>
private Polygon ReadPolygon(StreamTokenizer tokenizer)
{
string nextToken = GetNextEmptyOrOpener(tokenizer);
if (nextToken.Equals(WktEmpty))
{
LinearRing objRing = m_objFactory.CreateLinearRing(new Coordinate[] {});
return(m_objFactory.CreatePolygon(objRing, new LinearRing[] {}));
}
GeometryList holes = new GeometryList();
LinearRing shell = ReadLinearRing(tokenizer);
nextToken = GetNextCloserOrComma(tokenizer);
while (nextToken.Equals(TokenComma))
{
LinearRing hole = ReadLinearRing(tokenizer);
holes.Add(hole);
nextToken = GetNextCloserOrComma(tokenizer);
}
return(m_objFactory.CreatePolygon(shell,
holes.ToLinearRingArray()));
}
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()));
}
protected virtual Geometry Transform(Polygon geom, Geometry parent)
{
bool isAllValidLinearRings = true;
Geometry shell = Transform(geom.ExteriorRing, geom);
if (shell == null ||
!(shell.GeometryType == GeometryType.LinearRing) ||
shell.IsEmpty)
{
isAllValidLinearRings = false;
}
GeometryList holes = new GeometryList();
for (int i = 0; i < geom.NumInteriorRings; i++)
{
Geometry hole = Transform(geom.InteriorRing(i), geom);
if (hole == null || hole.IsEmpty)
{
continue;
}
if (!(hole.GeometryType == GeometryType.LinearRing))
{
isAllValidLinearRings = false;
}
holes.Add(hole);
}
if (isAllValidLinearRings)
{
return(geomFactory.CreatePolygon((LinearRing)shell,
holes.ToLinearRingArray()));
}
else
{
GeometryList components = new GeometryList();
if (shell != null)
{
components.Add(shell);
}
components.AddRange(holes);
return(geomFactory.BuildGeometry(components));
}
}