com.vividsolutions.jts.simplify
Class DouglasPeuckerSimplifier
java.lang.Object
com.vividsolutions.jts.simplify.DouglasPeuckerSimplifier
public class DouglasPeuckerSimplifier
- extends java.lang.Object
Simplifies a Geometry
using the standard Douglas-Peucker algorithm.
Ensures that any polygonal geometries returned are valid.
Simple lines are not guaranteed to remain simple after simplification.
All geometry types are handled.
Empty and point geometries are returned unchanged.
Note that in general D-P does not preserve topology -
e.g. polygons can be split, collapse to lines or disappear
holes can be created or disappear,
and lines can cross.
To simplify geometry while preserving topology use TopologyPreservingSimplifier
.
(However, using D-P is significantly faster).
- Version:
- 1.7
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
DouglasPeuckerSimplifier
public DouglasPeuckerSimplifier(Geometry inputGeom)
simplify
public static Geometry simplify(Geometry geom,
double distanceTolerance)
setDistanceTolerance
public void setDistanceTolerance(double distanceTolerance)
- Sets the distance tolerance for the simplification.
All vertices in the simplified geometry will be within this
distance of the original geometry.
The tolerance value must be non-negative.
- Parameters:
distanceTolerance
- the approximation tolerance to use
setEnsureValid
public void setEnsureValid(boolean isEnsureValidTopology)
- Controls whether simplified polygons will be "fixed"
to have valid topology.
The caller may choose to disable this because:
- valid topology is not required
- fixing topology is a relative expensive operation
- in some pathological cases the topology fixing operation may either fail or run for too long
The default is to fix polygon topology.
- Parameters:
isEnsureValidTopology
-
getResultGeometry
public Geometry getResultGeometry()