GEOS 3.2.2
Public Member Functions | Static Public Member Functions | Protected Member Functions
geos::geom::prep::PreparedPolygonCovers Class Reference

Computes the covers spatial relationship predicate for a PreparedPolygon relative to all other Geometry classes. More...

#include <PreparedPolygonCovers.h>

Inheritance diagram for geos::geom::prep::PreparedPolygonCovers:
geos::geom::prep::AbstractPreparedPolygonContains geos::geom::prep::PreparedPolygonPredicate

List of all members.

Public Member Functions

 PreparedPolygonCovers (const PreparedPolygon *const prep)
bool covers (const Geometry *geom)

Static Public Member Functions

static bool covers (const PreparedPolygon *const prep, const geom::Geometry *geom)

Protected Member Functions

bool fullTopologicalPredicate (const geom::Geometry *geom)

Detailed Description

Computes the covers spatial relationship predicate for a PreparedPolygon relative to all other Geometry classes.

Uses short-circuit tests and indexing to improve performance.

It is not possible to short-circuit in all cases, in particular in the case where the test geometry touches the polygon linework. In this case full topology must be computed.

Author:
Martin Davis

Constructor & Destructor Documentation

geos::geom::prep::PreparedPolygonCovers::PreparedPolygonCovers ( const PreparedPolygon *const  prep) [inline]

Creates an instance of this operation.

Parameters:
prepPolythe PreparedPolygon to evaluate

Member Function Documentation

static bool geos::geom::prep::PreparedPolygonCovers::covers ( const PreparedPolygon *const  prep,
const geom::Geometry geom 
) [inline, static]

Computes the covers predicate between a PreparedPolygon and a Geometry.

Parameters:
prepthe prepared polygon
geoma test geometry
Returns:
true if the polygon covers the geometry

References covers().

Referenced by covers().

bool geos::geom::prep::PreparedPolygonCovers::covers ( const Geometry geom) [inline]

Tests whether this PreparedPolygon covers a given geometry.

Parameters:
geomthe test geometry
Returns:
true if the test geometry is covered

References geos::geom::prep::AbstractPreparedPolygonContains::eval().

bool geos::geom::prep::PreparedPolygonCovers::fullTopologicalPredicate ( const geom::Geometry geom) [protected, virtual]

Computes the full topological covers predicate. Used when short-circuit tests are not conclusive.

Parameters:
geomthe test geometry
Returns:
true if this prepared polygon covers the test geometry

Implements geos::geom::prep::AbstractPreparedPolygonContains.


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