TGIS_Topology.Combine(TGIS_Shape, TGIS_Shape, TGIS_TopologyCombineType, bool) method

DK11 for .NET | TatukGIS.NDK.TGIS_Topology.Combine | Overloads | Constructors | Methods | Properties | Events

Compute a new shape from the two shapes provided, based on a given operation.

Available also on: Delphi | Java | ActiveX | Python.

// C#
public TGIS_Shape Combine(
  TGIS_Shape _shpA,
  TGIS_Shape _shpB,
  TGIS_TopologyCombineType _operation,
  bool _fixshape
);

' VisualBasic
Public Function Combine(
  ByVal _shpA As TGIS_Shape,
  ByVal _shpB As TGIS_Shape,
  ByVal _operation As TGIS_TopologyCombineType,
  ByVal _fixshape As Boolean
) As TGIS_Shape

// Oxygene
public
  function Combine(
    _shpA : TGIS_Shape;
    _shpB : TGIS_Shape;
    _operation : TGIS_TopologyCombineType;
    _fixshape : Boolean
  ) : TGIS_Shape;

See TGIS_Shape.Combine for example.

Tip for Intersection operation

When using with many shapes e.g. in loop, check input shapes extents before to improve performance.

// pseudocode:
if GisIsCommonExtent(_shpA, _shpB)
  out = TGIS_Topology.Combine(_shpA, _shpB, TGIS_TopologyCombineType.Intersection) ;

• Topology sample