GEOS
3.9.0dev

Interface for classes which provide operations that can be applied to the coordinates in a CoordinateSequence. More...
#include <CoordinateSequenceFilter.h>
Inherited by geos::algorithm::distance::DiscreteHausdorffDistance::MaxDensifiedByFractionDistanceFilter.
Public Member Functions  
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 shortcircuited. Geometry classes support the concept of applying a CoordinateSequenceFilter to each CoordinateSequences they contain.
CoordinateSequenceFilter is an example of the GangofFour Visitor pattern.

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

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

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.

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