GEOS 3.3.8

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geos::operation::overlay::OverlayOp Class Reference

Computes the overlay of two Geometry. More...

`#include <OverlayOp.h>`

Inheritance diagram for geos::operation::overlay::OverlayOp:

## Public Types

enum | OpCode { opINTERSECTION =1, opUNION, opDIFFERENCE, opSYMDIFFERENCE }
| The spatial functions supported by this class. More...

## Public Member Functions

| OverlayOp (const geom::Geometry *g0, const geom::Geometry *g1)
| Construct an OverlayOp with the given Geometry args.
geom::Geometry * | getResultGeometry (OpCode funcCode)
geomgraph::PlanarGraph & | getGraph ()
bool | isCoveredByLA (const geom::Coordinate &coord)
| This method is used to decide if a point node should be included in the result or not.
bool | isCoveredByA (const geom::Coordinate &coord)
| This method is used to decide if an L edge should be included in the result or not.
Public Member Functions inherited from geos::operation::GeometryGraphOperation
| GeometryGraphOperation (const geom::Geometry *g0, const geom::Geometry *g1)
| GeometryGraphOperation (const geom::Geometry *g0, const geom::Geometry *g1, const algorithm::BoundaryNodeRule &boundaryNodeRule)
| GeometryGraphOperation (const geom::Geometry *g0)
const geom::Geometry * | getArgGeometry (unsigned int i) const

## Static Public Member Functions

static geom::Geometry * | overlayOp (const geom::Geometry *geom0, const geom::Geometry *geom1, OpCode opCode)
static bool | isResultOfOp (geomgraph::Label *label, OpCode opCode)
static bool | isResultOfOp (int loc0, int loc1, OpCode opCode)
| This method will handle arguments of Location.NULL correctly.

## Protected Member Functions

void | insertUniqueEdge (geomgraph::Edge *e)
| Insert an edge from one of the noded input graphs.
Protected Member Functions inherited from geos::operation::GeometryGraphOperation
void | setComputationPrecision (const geom::PrecisionModel *pm)

## Additional Inherited Members

Protected Attributes inherited from geos::operation::GeometryGraphOperation
algorithm::LineIntersector | li
const geom::PrecisionModel * | resultPrecisionModel
std::vector < geomgraph::GeometryGraph * > | arg
| The operation args into an array so they can be accessed by index.

## Detailed Description

Computes the overlay of two Geometry.

The overlay can be used to determine any boolean combination of the geometries.

## Member Enumeration Documentation

enum geos::operation::overlay::OverlayOp::OpCode

The spatial functions supported by this class.

These operations implement various boolean combinations of the resultants of the overlay.

## Constructor & Destructor Documentation

geos::operation::overlay::OverlayOp::OverlayOp | ( | const geom::Geometry * | g0,
|  | const geom::Geometry * | g1
| ) |  |

Construct an OverlayOp with the given Geometry args.

Ownership of passed args will remain to caller, and the OverlayOp won't change them in any way.

## Member Function Documentation

void geos::operation::overlay::OverlayOp::insertUniqueEdge | ( | geomgraph::Edge * | e | ) |

protected

Insert an edge from one of the noded input graphs.

Checks edges that are inserted to see if an identical edge already exists. If so, the edge is not inserted, but its label is merged with the existing edge.

bool geos::operation::overlay::OverlayOp::isCoveredByA | ( | const geom::Coordinate & | coord | ) |

This method is used to decide if an L edge should be included in the result or not.

Returns
  true if the coord point is covered by a result Area geometry

bool geos::operation::overlay::OverlayOp::isCoveredByLA | ( | const geom::Coordinate & | coord | ) |

This method is used to decide if a point node should be included in the result or not.

Returns
  true if the coord point is covered by a result Line or Area geometry

static bool geos::operation::overlay::OverlayOp::isResultOfOp | ( | int | loc0,
|  | int | loc1,
|  | OpCode | opCode
| ) |  |

static

This method will handle arguments of Location.NULL correctly.

Returns
  true if the locations correspond to the opCode

The documentation for this class was generated from the following file:

- OverlayOp.h