jvx.geom

Class PgVertexStar

java.lang.Object

jv.object.PsObject

jvx.geom.PgVertexStar

All Implemented Interfaces:

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

public class PgVertexStar
extends PsObject

Vertex star of a vertex describes all elements which join a single vertex. The class contains information about

        element indices   of all elements around central vertex in counter-clockwise orientation.
        vertex indices    of all vertices in link in counter-clockwise orientation.
        local indices     of central vertex in each element.
 

See Also:

Serialized Form

Field Summary

Fields inherited from class jv.object.PsObject

HAS_BOUNDARY_PANEL, 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

Constructors

Constructor and Description
PgVertexStar()

Method Summary

Methods

Modifier and Type	Method and Description
void	copy(PsObject object) Copy a given vertex star into this object.
int	findEdge(PgElementSet geom, int locInd) Find index of edge connecting the vertex with an vertex in the link.
PiVector	findEdges(PgElementSet elemSet, PiVector edge) Get indices of the edges connecting the central vertices with its link vertices.
PiVector	getElement() Get list of element indices of vertex star.
boolean	getElementOrientation(PgElementSet geom, int locInd) Returns true, if the adjacent element is positive oriented relative to the orientation of the vertex star.
static PiVector	getElementPerVertex(PgElementSet elemSet) Generate a PiVector elements, such that elements.m_data[i] references either an element incident to vertex i, or elements.m_data[i]=-1 in case vertex i is isolated.
int	getFirstElemInd() Get the index of first elemInd in m_element array of vertex star.
PiVector	getLink() Get list of vertex indices of vertex star.
int	getSize() Get number of elements in vertex star.
PiVector	getVertexLocInd() Get list of local indices of central vertex in adjacent elements.
void	init() If instance has missing name then assign default name 'Object_NUMBER' where number is the total number of already created instances.
boolean	isClosed() Returns whether vertex star around a point is closed.
static PiVector[]	makeVertexNeighbours(PgElementSet geom) Generate a PiVector[] which contains a list of adjacent vertices for each vertex of the geometry.
void	makeVertexStar(PgElementSet elemSet, int vertexInd, int elemInd) Create the vertex star of a vertex of an element set.
void	reverse() Reverses the pass through the vertex star, e.g. the order of the neighbour elements and vertices will change between counterclockwise and clockwise.
void	setSize(int size, boolean closed) Set number of elements in vertex star.
java.lang.String	toString() Create a multi-line string representation with detailed information about all instance variables.

Methods inherited from class jv.object.PsObject

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

Methods inherited from class java.lang.Object

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

Constructor Detail

PgVertexStar

public PgVertexStar()

Method Detail

init

public void init()

Description copied from class: PsObject

If instance has missing name then assign default name 'Object_NUMBER' where number is the total number of already created instances.

Overrides:

init in class PsObject

toString

public java.lang.String toString()

Create a multi-line string representation with detailed information about all instance variables.

Overrides:

toString in class PsObject

copy

public void copy(PsObject object)

Copy a given vertex star into this object.

Overrides:

copy in class PsObject

See Also:

PsObject.clone()

getElement

public PiVector getElement()

Get list of element indices of vertex star.

getLink

public PiVector getLink()

Get list of vertex indices of vertex star. Vertices i and (i+1) in this list belong to element i of getElement().

getVertexLocInd

public PiVector getVertexLocInd()

Get list of local indices of central vertex in adjacent elements.

isClosed

public boolean isClosed()

Returns whether vertex star around a point is closed. Vertex star is closed if and only if point lies in the interior of a surface. If point lies on the surface boundary then the vertex star is not closed.

getFirstElemInd

public int getFirstElemInd()

Get the index of first elemInd in m_element array of vertex star. If no first elemInd is supplied by user, then, if star is closed the m_firstElemInd is the first element of the surface referencing the central vertex, or, if star is not closed, the element on the boundary is taken such that one walks through the star counter-clockwise.

getSize

public int getSize()

Get number of elements in vertex star.

setSize

public void setSize(int size,
           boolean closed)

Set number of elements in vertex star.

getElementPerVertex

public static PiVector getElementPerVertex(PgElementSet elemSet)

Generate a PiVector elements, such that elements.m_data[i] references either an element incident to vertex i, or elements.m_data[i]=-1 in case vertex i is isolated. If vertex i is a boundary vertex, then elements.m_data[i] references a boundary element.

Parameters:

elemSet - PgElementSet

Returns:

A PiVector elements, such that elements.m_data[i] is either an element incident to vertex i, or -1, if vertex i is isolated.

makeVertexNeighbours

public static PiVector[] makeVertexNeighbours(PgElementSet geom)

Generate a PiVector[] which contains a list of adjacent vertices for each vertex of the geometry.

findEdges

public PiVector findEdges(PgElementSet elemSet,
                 PiVector edge)

Get indices of the edges connecting the central vertices with its link vertices. The provided vertex star must have been made with the same underlying element set.

Parameters:

elemSet - The element set, which was used to create the vertex star.

edge - The output PiVector which is filled with edge indices. May be null.

Returns:

PiVector of indices of the edges incident to the central vertex.

See Also:

makeVertexStar(PgElementSet, int, int)

findEdge

public int findEdge(PgElementSet geom,
           int locInd)

Find index of edge connecting the vertex with an vertex in the link.

Parameters:

geom - Base geometry.

locInd - Local index of neighbour vertex in link.

Returns:

Global index of edge connecting the two vertices or -1 in case of error.

getElementOrientation

public boolean getElementOrientation(PgElementSet geom,
                            int locInd)

Returns true, if the adjacent element is positive oriented relative to the orientation of the vertex star.

Parameters:

locInd - Local element index.

makeVertexStar

public void makeVertexStar(PgElementSet elemSet,
                  int vertexInd,
                  int elemInd)

Create the vertex star of a vertex of an element set.

If elemInd!=-1, then, if star is closed, elemInd is the first element referencing the central vertex, or, if star is not closed, the element on those boundary is taken such that one walks through the star counter-clockwise.

For efficiency applications are advised to supply the index of an element in the argument list. This avoids an initial run through the set of elements.

If neighbourhood is incorrect then warnings are issued.

Parameters:

elemSet - PgElementSet

vertexInd - Index of vertex in global vertex array of elemSet

elemInd - Index of element in global element array which references the vertex, might be -1.

reverse

public void reverse()

Reverses the pass through the vertex star, e.g. the order of the neighbour elements and vertices will change between counterclockwise and clockwise.