jvx.geom
Class PwReeb

java.lang.Object
  jv.object.PsObject
      jvx.project.PjWorkshop
          jvx.geom.PwReeb

All Implemented Interfaces:

java.lang.Cloneable, PjWorkshopIf, PsUpdateIf, java.io.Serializable

public class PwReeb

extends PjWorkshop

Workshop to compute and work with the Reeb graph of triangulated surfaces. Includes methods to find and visualize irregular vertices of a pieceweise linear function on a surface.

See Also:

Serialized Form

Field Summary

Fields inherited from class jv.object.PsObject

HAS_CONFIG_PANEL, HAS_INFO_PANEL, HAS_LABEL_PANEL, HAS_MATERIAL_PANEL, HAS_TEXTURE_PANEL, HAS_VECTOR_PANEL, INSPECTOR_INFO, INSPECTOR_INFO_EXT, IS_DELETED, IS_FIXED, IS_FOCUSSED, IS_PICKED, IS_SELECTED, IS_USED, NUM_TAGS

Constructor Summary

PwReeb()
Constructor.

Method Summary

void	cancel() Cancel operation of this workshop by resetting the assigned geometry, and finally close this workshop.
PgPolygonSet	computeReebGraph() Compute the Reeb graph using the actual function.
PdVector	getFunction(PdVector scalar) Get actual function the computation of the Reeb graph will based on.
static PiVector	getIrregularVerticesOfMorseFunction(PgElementSet geom, PdVector scalar) Method returns the irrgeular vertices of geom with respect to the given function scalar.
static int	getVertexIndicesOfMorseFunction(PgElementSet geom, PdVector scalar, PiVector indices) Method computes the discrete index of every vertex of a given geometry and a given scalar function.
static int	getVertexIndicesOfMorseFunction(PgElementSet geom, PiVector scalar, PiVector indices) Method computes the discrete index of every vertex of a given geometry and a given scalar function.
void	init() Method is called after constructors of super classes are called.
static PgPolygonSet	makeIsocurves(PgElementSet geom, PdVector levels, PgPolygonSet isoCurves, PdVector scalar) Computes a set of isoCurves of a scalar field on a triangulated surface.
void	setDijkstraDistanceFunction(PiVector front) Set the function the computation of the Reeb graph will be based on to be the Dijstra distance with respect to the vertices given as a parameter.
void	setFunction(PdVector scalar) Specify function used to compute the Reeb graph.
void	setGeometry(PgElementSet geom) Reeb graph of the given geometry is generated.
void	setHeightFunction() Use the height function with regard to the z-coordinate as the function the computation of the Reeb graph will be based on.
void	setHeightFunction(PdVector dir) Use the height function with regard to the direction given as argument as the function the computation of the Reeb graph will be based on.
boolean	update(java.lang.Object event) Update the class whenever a child has changed.

Methods inherited from class jvx.project.PjWorkshop

close, getDisplay, getDisplays, getGeometry, getSavedGeometry, getViewer, isModal, ok, removeGeometry, reset, setDisplay, setDisplays, setGeometry, setModal, setViewer

Methods inherited from class jv.object.PsObject

addInspector, addUpdateListener, assureInspector, clearTag, clone, clone, clone, copy, getFather, getInfoPanel, getInspector, getName, getNumObjects, getSymbol, hasInspector, hasTag, hasUpdateListener, instanceOf, instanceOf, newInspector, newInspector, removeInspector, removeInspector, removeUpdateListener, setName, setParent, setSymbol, setTag, toString, updatePanels

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface jv.object.PsUpdateIf

getFather, getName, setParent

Constructor Detail

PwReeb

public PwReeb()

Constructor.

Method Detail

init

public void init()

Method is called after constructors of super classes are called.

Overrides:

init in class PjWorkshop

setGeometry

public void setGeometry(PgElementSet geom)

Reeb graph of the given geometry is generated. If geometry is not a triangulation, geometry is triangulated. A copy of geometry is cached, the method cancel() returns the original geometry.

Parameters:

geom - Compute Reeb graph of geom.

cancel

public void cancel()

Cancel operation of this workshop by resetting the assigned geometry, and finally close this workshop.

If necessary, the duplicate of the original geometry is restored into the geometry.

Overrides:

cancel in class PjWorkshop

update

public boolean update(java.lang.Object event)

Update the class whenever a child has changed. Method is usually invoked from the children.

Specified by:

update in interface PsUpdateIf

Overrides:

update in class PjWorkshop

Parameters:

event - sender of this update.

Returns:

true if update was correctly handled by superclass.

getVertexIndicesOfMorseFunction

public static int getVertexIndicesOfMorseFunction(PgElementSet geom,
                                                  PiVector scalar,
                                                  PiVector indices)

Method computes the discrete index of every vertex of a given geometry and a given scalar function. If vertices are mapped on the same value by the given scalar function, these vertices are ordered by their indices in vertex array of geom. If a vertex is on the boundary the number of signum changes is doubled.

Parameters:

scalar - Scalar function on geom as a PdVector, assigning an integer to each vertex.

indices - Method stores the index of each vertex.

Returns:

int Number of irregular Vertices.

getVertexIndicesOfMorseFunction

public static int getVertexIndicesOfMorseFunction(PgElementSet geom,
                                                  PdVector scalar,
                                                  PiVector indices)

Method computes the discrete index of every vertex of a given geometry and a given scalar function. If vertices are mapped on the same value by the given scalar function, these vertices are ordered by their indices in vertex array of geom. If a vertex is on the boundary the number of signum changes is doubled.

Parameters:

scalar - Scalar value at each vertex determines the PL function.

indices - Method stores the index of each vertex.

Returns:

number of irregular vertices

getIrregularVerticesOfMorseFunction

public static PiVector getIrregularVerticesOfMorseFunction(PgElementSet geom,
                                                           PdVector scalar)

Method returns the irrgeular vertices of geom with respect to the given function scalar. Vertices are ordered by ascending value of scalar.

Parameters:

scalar - Scalar function on geom as a PdVector, assigning a double to each vertex.

Returns:

Irregular vertices of geom with respect to scalar, ordered by ascending value of scalar.

setHeightFunction

public void setHeightFunction()

Use the height function with regard to the z-coordinate as the function the computation of the Reeb graph will be based on.

setHeightFunction

public void setHeightFunction(PdVector dir)

Use the height function with regard to the direction given as argument as the function the computation of the Reeb graph will be based on.

Parameters:

dir - direction of the height function

setDijkstraDistanceFunction

public void setDijkstraDistanceFunction(PiVector front)

Set the function the computation of the Reeb graph will be based on to be the Dijstra distance with respect to the vertices given as a parameter.

Parameters:

front - indices of those vertices that will have Dijstra Distance zero.

setFunction

public void setFunction(PdVector scalar)

Specify function used to compute the Reeb graph. Function is specified by a function value for each vertex. We interpolate in the element.

Parameters:

scalar - Vector containing the function values of each vertex. The ordering of the values must be the same as the ordering of the vertices.

getFunction

public PdVector getFunction(PdVector scalar)

Get actual function the computation of the Reeb graph will based on. Function is specified by a function value for each vertex and linear interpoation in the elements. The ordering of the values is be the same as the ordering of the vertices.

computeReebGraph

public PgPolygonSet computeReebGraph()

Compute the Reeb graph using the actual function. The Reeb graph is visualized as a polygon set. This polygon set is shown in the display (associated to the workshop) and returned.

Returns:

PgPolygonSet Visualization of the Reeb Graph as a polygon set

makeIsocurves

public static PgPolygonSet makeIsocurves(PgElementSet geom,
                                         PdVector levels,
                                         PgPolygonSet isoCurves,
                                         PdVector scalar)

Computes a set of isoCurves of a scalar field on a triangulated surface. The function is given as a PdVector. Each double of the vector is regarded as the function value of the vertex of the surface with the corresponding index. In the interior of elements the function is linearly interpolated. The isoCurves are returned as a list of polygons each consisting of only one edge. The isovalue of each polygon is given as a PdVector. To simplify the polygon set see PuCleanMesh.identifyVertices(PgGeometry) and PwCleanMesh.joinPolygons.

Parameters:

geom - Base surface must consist of triangles only.

levels - List of values sorted by increasing value, determines the computed isoCurves.

isoCurves - Isocurves which will be computed.

scalar - Scalar values at each vertex of the base geometry.

Since:

JavaView 2.65.000