Package cz.fidentis.analyst.engines.sampling.impl

Class UniformSpaceSampling

java.lang.Object

cz.fidentis.analyst.engines.sampling.impl.PointSamplingVisitorImpl

cz.fidentis.analyst.engines.sampling.impl.UniformSpaceSampling

All Implemented Interfaces:

MeshVisitor, PointSamplingVisitor

Direct Known Subclasses:

UniformSurfaceSampling

public class UniformSpaceSampling
extends PointSamplingVisitorImpl

This downsampling algorithm divides the space uniformly using 3D grid. Then, it computes and returns average position (centroid) of points in grid cells. The number of samples is often slightly higher the required number.

Constructor Summary

Constructors

Constructor	Description
UniformSpaceSampling(int max)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected UniformGrid3d<MeshPoint>	createGrid()
protected double	getAvgDist(Collection<MeshPoint> vertices, javax.vecmath.Point3d centroid)	Computes the average distance between vertices and their centroid.
protected List<MeshPoint>	getOrigPoints()
List<MeshPoint>	getSamples()	Returns a list of vertices reduced according to the strategy.
boolean	isBackedByOrigMesh()	If true, then the returned points samples are points from the original mesh.
String	toString()
void	visitMeshFacet(MeshFacet facet)	The inspection method to be implemented by specific visitors.

Methods inherited from class cz.fidentis.analyst.engines.sampling.impl.PointSamplingVisitorImpl

getRequiredSamples, setRealSamples, setRequiredSamples

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface cz.fidentis.analyst.data.mesh.MeshVisitor

dispose, isThreadSafe

Constructor Details

UniformSpaceSampling

public UniformSpaceSampling(int max)

Constructor.

Parameters:

max - Required number of samples. Must be bigger than zero

Throws:

IllegalArgumentException - if the input parameter is wrong

Method Details

isBackedByOrigMesh

public boolean isBackedByOrigMesh()

Description copied from interface: PointSamplingVisitor

If true, then the returned points samples are points from the original mesh. Therefore, the transformation of the original mesh also transform these samples. If false, then new points are returned that are independent on the original mesh.

Specified by:

isBackedByOrigMesh in interface PointSamplingVisitor

Specified by:

isBackedByOrigMesh in class PointSamplingVisitorImpl

Returns:

true if the point samples include points of the original mesh

visitMeshFacet

public void visitMeshFacet(MeshFacet facet)

Description copied from interface: MeshVisitor

The inspection method to be implemented by specific visitors.

Specified by:

visitMeshFacet in interface MeshVisitor

Specified by:

visitMeshFacet in interface PointSamplingVisitor

Specified by:

visitMeshFacet in class PointSamplingVisitorImpl

Parameters:

facet - Mesh facet to be visited.

getSamples

public List<MeshPoint> getSamples()

Description copied from interface: PointSamplingVisitor

Returns a list of vertices reduced according to the strategy. The returned mesh points are backed by original points.

Specified by:

getSamples in interface PointSamplingVisitor

Specified by:

getSamples in class PointSamplingVisitorImpl

Returns:

selected vertices of inspected meshes

toString

public String toString()

Overrides:

toString in class PointSamplingVisitorImpl

getOrigPoints

protected List<MeshPoint> getOrigPoints()

getAvgDist

protected double getAvgDist(Collection<MeshPoint> vertices,
 javax.vecmath.Point3d centroid)

Computes the average distance between vertices and their centroid.

Parameters:

vertices - vertices

centroid - their centroid

Returns:

the average distance between vertices and their centroid.

createGrid

protected UniformGrid3d<MeshPoint> createGrid()