Package WildMagic.LibFoundation.Curves

Class BSplineBasisDiscretef

java.lang.Object

WildMagic.LibFoundation.Curves.BSplineBasisf

WildMagic.LibFoundation.Curves.BSplineBasisDiscretef

All Implemented Interfaces:

java.io.Serializable

public class BSplineBasisDiscretef
extends BSplineBasisf
implements java.io.Serializable

This class is an implementation of an open uniform B-Spline with equally spaced samples taken over the input [0,1] interval. The basis function evaluations are pre-computed at each sample and for each control point so that getting the position for an input value is simply a table lookup and does not involve any calculations.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected float[][]	m_aafSampleD0	Position
protected float[][]	m_aafSampleD1	First derivative
protected float[][]	m_aafSampleD2	Second derivative
protected int[]	m_aiControlPointSampleIndexMax	sample max
protected int[]	m_aiControlPointSampleIndexMin	sample min
protected int	m_iNumSamples	num samples
private static long	serialVersionUID

Fields inherited from class WildMagic.LibFoundation.Curves.BSplineBasisf

m_aafBD0, m_aafBD1, m_aafBD2, m_aafBD3, m_afKnot, m_bOpen, m_bUniform, m_iDegree, m_iNumCtrlPoints, m_iNumKnots

Constructor Summary

Constructors

Constructor	Description
BSplineBasisDiscretef(int iNumCtrlPoints, int iDegree, int iNumSamples)	Create a set of B-Spline uniform open basis functions for the given number of control points and degree of the basis functions.

Method Summary

Modifier and Type	Method	Description
void	dispose()	Cleanup memory.
int	GetControlPointSampleIndexMax(int iControl)	Return the maximum index of the range of samples affected by the specified control point.
int	GetControlPointSampleIndexMin(int iControl)	Return the minimum index of the range of samples affected by the specified control point.
float	GetD0(int iControl, int iSample)	Return the position basis function evaluation which determines how much the specified control point affects the specified sample.
float	GetD1(int iControl, int iSample)	Return the first derivative basis function evaluation which determines how much the specified control point affects the specified sample.
float	GetD2(int iControl, int iSample)	Return the second derivative basis function evaluation which determines how much the specified control point affects the specified sample.
int	GetNumSamples()	Return the number of samples specified in the constructor.

Methods inherited from class WildMagic.LibFoundation.Curves.BSplineBasisf

Compute, Compute, Create, Create, GetD0, GetD1, GetD2, GetD3, GetDegree, GetKey, GetKnot, GetKnotIndex, GetMinNumControlPoints, GetNumCtrlPoints, IsOpen, IsSameAs, IsUniform, SetKnot

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

m_aafSampleD0

protected float[][] m_aafSampleD0

Position

m_aafSampleD1

protected float[][] m_aafSampleD1

First derivative

m_aafSampleD2

protected float[][] m_aafSampleD2

Second derivative

m_aiControlPointSampleIndexMax

protected int[] m_aiControlPointSampleIndexMax

sample max

m_aiControlPointSampleIndexMin

protected int[] m_aiControlPointSampleIndexMin

sample min

m_iNumSamples

protected int m_iNumSamples

num samples

Constructor Detail

BSplineBasisDiscretef

public BSplineBasisDiscretef(int iNumCtrlPoints,
                             int iDegree,
                             int iNumSamples)

Create a set of B-Spline uniform open basis functions for the given number of control points and degree of the basis functions. These basis functions have been sampled equally over the [0,1] input interval.

Parameters:

iNumCtrlPoints - Number of control points.

iDegree - B-Spline degree of basis functions.

iNumSamples - Number of equally spaced samples.

Throws:

java.lang.IllegalArgumentException - if iNumSamples > iNumCtrlPoints

Method Detail

dispose

public void dispose()

Cleanup memory.

Overrides:

dispose in class BSplineBasisf

Throws:

java.lang.Throwable - DOCUMENT ME!

GetControlPointSampleIndexMax

public int GetControlPointSampleIndexMax(int iControl)

Return the maximum index of the range of samples affected by the specified control point.

Parameters:

iControl - Index of a specified control point.

Returns:

Maximum index of affected sample range.

GetControlPointSampleIndexMin

public int GetControlPointSampleIndexMin(int iControl)

Return the minimum index of the range of samples affected by the specified control point.

Parameters:

iControl - Index of a specified control point.

Returns:

Minimum index of affected sample range.

GetD0

public float GetD0(int iControl,
                   int iSample)

Return the position basis function evaluation which determines how much the specified control point affects the specified sample.

Parameters:

iControl - Index of a specified control point.

iSample - Index of a specified sample.

Returns:

Associated position basis function evaluation.

GetD1

public float GetD1(int iControl,
                   int iSample)

Return the first derivative basis function evaluation which determines how much the specified control point affects the specified sample.

Parameters:

iControl - Index of a specified control point.

iSample - Index of a specified sample.

Returns:

float Associated first derivative basis function evaluation.

GetD2

public float GetD2(int iControl,
                   int iSample)

Return the second derivative basis function evaluation which determines how much the specified control point affects the specified sample.

Parameters:

iControl - Index of a specified control point.

iSample - Index of a specified sample.

Returns:

float Associated second derivative basis function evaluation.

GetNumSamples

public int GetNumSamples()

Return the number of samples specified in the constructor.

Returns:

Number of samples.