GEOS
3.9.1dev
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Interface for classes which provide operations that can be applied to the coordinates in a CoordinateSequence. More...
#include <CoordinateSequenceFilter.h>
Public Member Functions | |
virtual | ~CoordinateSequenceFilter () |
virtual void | filter_rw (CoordinateSequence &, std::size_t) |
Performs an operation on a coordinate in a CoordinateSequence. More... | |
virtual void | filter_ro (const CoordinateSequence &, std::size_t) |
Performs an operation on a coordinate in a CoordinateSequence. More... | |
virtual bool | isDone () const =0 |
Reports whether the application of this filter can be terminated. More... | |
virtual bool | isGeometryChanged () const =0 |
Reports whether the execution of this filter has modified the coordinates of the geometry. More... | |
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.
Definition at line 57 of file CoordinateSequenceFilter.h.
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inlinevirtual |
Definition at line 62 of file CoordinateSequenceFilter.h.
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inlinevirtual |
Performs an operation on a coordinate in a CoordinateSequence.
param seq
the CoordinateSequence to which the filter is applied param i
the index of the coordinate to apply the filter to
Reimplemented in geos::algorithm::distance::DiscreteHausdorffDistance::MaxDensifiedByFractionDistanceFilter.
Definition at line 83 of file CoordinateSequenceFilter.h.
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inlinevirtual |
Performs an operation on a coordinate in a CoordinateSequence.
param seq
the CoordinateSequence to which the filter is applied param i
the index of the coordinate to apply the filter to
Definition at line 71 of file CoordinateSequenceFilter.h.
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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.
true
if the application of this filter can be terminated. Implemented in geos::algorithm::distance::DiscreteHausdorffDistance::MaxDensifiedByFractionDistanceFilter.
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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.
true
if this filter has changed the coordinates of the geometry Implemented in geos::algorithm::distance::DiscreteHausdorffDistance::MaxDensifiedByFractionDistanceFilter.