TGIS_Topology.Combine(TGIS_Shape; TGIS_Shape; TGIS_TopologyCombineType; Boolean) method

DK11 for Delphi | GisTopology.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: .NET | Java | ActiveX | Python.

// Delphi
public
  function Combine(
    const _shpA : TGIS_Shape;
    const _shpB : TGIS_Shape;
    const _operation : TGIS_TopologyCombineType;
    const _fixshape : Boolean
  ) : TGIS_Shape; overload;

// C++ Builder
public:
  TGIS_Shape* Combine(
    TGIS_Shape* const _shpA,
    TGIS_Shape* const _shpB,
    TGIS_TopologyCombineType* const _operation,
    const bool _fixshape
  ) /* overload */;

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