GEOS 3.4.2

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geos::geom::prep::AbstractPreparedPolygonContains Class Referenceabstract

A base class containing the logic for computes the `contains` and `covers` spatial relationship predicates for a PreparedPolygon relative to all other Geometry classes. More...

`#include <AbstractPreparedPolygonContains.h>`

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

## Public Member Functions
| AbstractPreparedPolygonContains (const PreparedPolygon *const prepPoly)
| AbstractPreparedPolygonContains (const PreparedPolygon *const prepPoly, bool requireSomePointInInterior)
Public Member Functions inherited from geos::geom::prep::PreparedPolygonPredicate
| PreparedPolygonPredicate (const PreparedPolygon *const prepPoly)

## Protected Member Functions
bool | eval (const geom::Geometry *geom)
virtual bool | fullTopologicalPredicate (const geom::Geometry *geom)=0
Protected Member Functions inherited from geos::geom::prep::PreparedPolygonPredicate
bool | isAllTestComponentsInTarget (const geom::Geometry *testGeom) const
| Tests whether all components of the test Geometry are contained in the target geometry.
bool | isAllTestComponentsInTargetInterior (const geom::Geometry *testGeom) const
| Tests whether all components of the test Geometry are contained in the interior of the target geometry.
bool | isAnyTestComponentInTarget (const geom::Geometry *testGeom) const
| Tests whether any component of the test Geometry intersects the area of the target geometry.
bool | isAnyTestComponentInTargetInterior (const geom::Geometry *testGeom) const
| Tests whether any component of the test Geometry intersects the interior of the target geometry.
bool | isAnyTargetComponentInAreaTest (const geom::Geometry *testGeom, const geom::Coordinate::ConstVect *targetRepPts) const

## Protected Attributes
bool | requireSomePointInInterior
Protected Attributes inherited from geos::geom::prep::PreparedPolygonPredicate
const PreparedPolygon *const | prepPoly

## Detailed Description

A base class containing the logic for computes the `contains` and `covers` spatial relationship predicates for a PreparedPolygon relative to all other Geometry classes.

Uses short-circuit tests and indexing to improve performance.

Contains and covers are very similar, and differ only in how certain cases along the boundary are handled. These cases require full topological evaluation to handle, so all the code in this class is common to both predicates.

It is not possible to short-circuit in all cases, in particular in the case where line segments of the test geometry touches the polygon linework. In this case full topology must be computed. (However, if the test geometry consists of only points, this can be evaluated in an optimized fashion.

Author
  Martin Davis

## Member Function Documentation

bool geos::geom::prep::AbstractPreparedPolygonContains::eval | ( | const geom::Geometry * | geom | ) |
| protected

Evaluate the `contains` or `covers` relationship for the given geometry.

Parameters

  geom | the test geometry

Returns
  true if the test geometry is contained

Referenced by geos::geom::prep::PreparedPolygonContains::contains(), and geos::geom::prep::PreparedPolygonCovers::covers().

virtual bool geos::geom::prep::AbstractPreparedPolygonContains::fullTopologicalPredicate | ( | const geom::Geometry * | geom | ) |
| protected pure virtual

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

Parameters

  geom | the test geometry

Returns
  true if this prepared polygon has the relationship with the test geometry

Implemented in geos::geom::prep::PreparedPolygonContains, and geos::geom::prep::PreparedPolygonCovers.

## Member Data Documentation

bool geos::geom::prep::AbstractPreparedPolygonContains::requireSomePointInInterior
| protected

This flag controls a difference between contains and covers.

For contains the value is true. For covers the value is false.

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

- AbstractPreparedPolygonContains.h