#include <CoordinateSequenceFilter.h>
Inherited by geos::algorithm::distance::DiscreteHausdorffDistance::MaxDensifiedByFractionDistanceFilter.
Public Member Functions | |
virtual void | filter_rw (CoordinateSequence &, size_t) |
virtual void | filter_ro (const CoordinateSequence &, size_t) |
virtual bool | isDone () const =0 |
virtual bool | isGeometryChanged () const =0 |
Interface for classes which provide operations that can be applied to the coordinates in a CoordinateSequence. A CoordinateSequence filter can either record information about each coordinate or change the coordinate in some way. CoordinateSequence filters can be used to implement such things as coordinate transformations, centroid and envelope computation, and many other functions. For maximum efficiency, the execution of filters can be short-circuited. Geometry classes support the concept of applying a CoordinateSequenceFilter
to each CoordinateSequences they contain.
CoordinateSequenceFilter
is an example of the Gang-of-Four Visitor pattern.
virtual void geos::geom::CoordinateSequenceFilter::filter_ro | ( | const CoordinateSequence & | , | |
size_t | ||||
) | [inline, virtual] |
Performs an operation on a coordinate in a CoordinateSequence.
seq | the CoordinateSequence to which the filter is applied | |
i | the index of the coordinate to apply the filter to |
virtual void geos::geom::CoordinateSequenceFilter::filter_rw | ( | CoordinateSequence & | , | |
size_t | ||||
) | [inline, virtual] |
Performs an operation on a coordinate in a CoordinateSequence.
seq | the CoordinateSequence to which the filter is applied | |
i | the index of the coordinate to apply the filter to |
virtual bool geos::geom::CoordinateSequenceFilter::isDone | ( | ) | const [pure virtual] |
Reports whether the application of this filter can be terminated. Once this method returns false
, it should continue to return false
on every subsequent call.
virtual bool geos::geom::CoordinateSequenceFilter::isGeometryChanged | ( | ) | const [pure virtual] |
Reports whether the execution of this filter has modified the coordinates of the geometry. If so, Geometry#geometryChanged will be executed after this filter has finished being executed.
Most filters can simply return a constant value reflecting whether they are able to change the coordinates.