jvx.numeric
Class PnSpringEnergy

java.lang.Object
  jv.object.PsObject
      jvx.numeric.PnFunction
          jvx.numeric.PnEnergy
              jvx.numeric.PnSpringEnergy

All Implemented Interfaces:

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

public class PnSpringEnergy

extends PnEnergy

Spring energy including gradient computation.

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

PnSpringEnergy()

Method Summary

double	eval(PdVector coord) Compute conformal energy of a coord vector using newly initialized stiffness matrix.
PdVector	evalGradient(PdVector coord, PdVector gradient) Evaluate gradient of a coord vector using the stiffness matrix.
void	init() If instance has missing name then assign default name 'Object_NUMBER' where number is the total number of already created instances.
void	initSurface(PgElementSet domain, PgElementSet surface) Method called from energyMinimizer.minimizeStep() to update the stiffness matrix after conjugate gradient method has returned.
boolean	setSurface(PgElementSet domain, PgElementSet surface) Set domain and surface, and initialize energy structure.

Methods inherited from class jvx.numeric.PnEnergy

evalHessian, getNumOfVariables, getSpectrum, getZeroGradientAtBounds, isEnabledConstrainMatrix, setEnabledConstrainMatrix, setZeroGradientAtBounds, testEigenvalues

Methods inherited from class jvx.numeric.PnFunction

enableEvaluation, isEvaluable

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, update, updatePanels

Methods inherited from class java.lang.Object

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

Constructor Detail

PnSpringEnergy

public PnSpringEnergy()

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 PnEnergy

initSurface

public void initSurface(PgElementSet domain,
                        PgElementSet surface)

Method called from energyMinimizer.minimizeStep() to update the stiffness matrix after conjugate gradient method has returned. E.g. PnSpringEnergy should copy surface into domain if in iteration mode i.e. if dimension of domain and surface are equal.

Overrides:

initSurface in class PnEnergy

setSurface

public boolean setSurface(PgElementSet domain,
                          PgElementSet surface)

Set domain and surface, and initialize energy structure. Method is called from outside whenever domain or surface has been updated.

Overrides:

setSurface in class PnEnergy

Parameters:

domain - additional geometry used to specify maps

surface - geometry which is usually optimized

eval

public double eval(PdVector coord)

Compute conformal energy of a coord vector using newly initialized stiffness matrix. Method uses the array m_store for intermediate storage and modifies its entries.

Overrides:

eval in class PnEnergy

Parameters:

coord - Coordinate vector with list of doubles

Returns:

double Energy of coordinate vector

See Also:

PnEnergy

evalGradient

public PdVector evalGradient(PdVector coord,
                             PdVector gradient)

Evaluate gradient of a coord vector using the stiffness matrix.

Overrides:

evalGradient in class PnEnergy

Parameters:

coord - Coordinate vector with list of doubles

gradient - Gradient vector to be modified

See Also:

PnEnergy