GA_ForwardDifference< T > Class Template Reference

Polynomial forward differencer. More...

#include <GA_ForwardDifference.h>

Public Member Functions
	GA_ForwardDifference (const GA_ROGenericHandleVertex< T > &gah)
	Perform forward differencing. More...
	GA_ForwardDifference (const GA_ROGenericHandleVertex< T > &gah, int uord, fpreal uinc, int vord=1, fpreal vinc=1)
	~GA_ForwardDifference ()
void	initialize (const GA_ROGenericHandleVertex< T > &gah, int uord, fpreal uinc, int vord=1, fpreal vinc=1)
void	walk (const GA_ROGenericHandleVertex< T > &gah, int ucount, int uoff, T *results)
void	walk (const GA_ROGenericHandleVertex< T > &gah, int ucount, int vcount, int uoff, int voff, int ncols, T *results)
int	getUOrder () const
fpreal	getUStep () const
	Return the initialized U integration step size. More...
int	getVOrder () const
	Return the initialized V order. More...
fpreal	getVStep () const
	Return the initialized V integration step size. More...
T &	getDerivative (int u, int v=0)
	Return the offset for the derivative. More...

Detailed Description

template<typename T>
class GA_ForwardDifference< T >

Polynomial forward differencer.

This class performs forward differencing of polynomial functions by forward differencing. To use this class, you need to specify

• The order of the polynomial
• The N derivatives of the polynomial (one for each degree) The forward differencer can then evaluate the polynomial very efficiently.

Definition at line 34 of file GA_ForwardDifference.h.

Constructor & Destructor Documentation

template<typename T >

GA_ForwardDifference< T >::GA_ForwardDifference

(

const GA_ROGenericHandleVertex< T > &

gah

)

Perform forward differencing.

template<typename T >

GA_ForwardDifference< T >::GA_ForwardDifference	(	const GA_ROGenericHandleVertex< T > &	gah,
		int	uord,
		fpreal	uinc,
		int	vord = 1,
		fpreal	vinc = 1
	)

template<typename T >

GA_ForwardDifference< T >::~GA_ForwardDifference

(

)

Member Function Documentation

template<typename T >

T& GA_ForwardDifference< T >::getDerivative ( int  u, int  v = 0  )

inline

Return the offset for the derivative.

Definition at line 63 of file GA_ForwardDifference.h.

template<typename T >

int GA_ForwardDifference< T >::getUOrder ( ) const

inline

Return the initialized U order

Definition at line 53 of file GA_ForwardDifference.h.

template<typename T >

fpreal GA_ForwardDifference< T >::getUStep ( ) const

inline

Return the initialized U integration step size.

Definition at line 55 of file GA_ForwardDifference.h.

template<typename T >

int GA_ForwardDifference< T >::getVOrder ( ) const

inline

Return the initialized V order.

Definition at line 58 of file GA_ForwardDifference.h.

template<typename T >

fpreal GA_ForwardDifference< T >::getVStep ( ) const

inline

Return the initialized V integration step size.

Definition at line 60 of file GA_ForwardDifference.h.

template<typename T >

void GA_ForwardDifference< T >::initialize	(	const GA_ROGenericHandleVertex< T > &	gah,
		int	uord,
		fpreal	uinc,
		int	vord = 1,
		fpreal	vinc = 1
	)

Initialize the forward differencer with

Parameters

uord	Order of the spline in U
uinc	Stepping increment for integration in U
vord	Order of the spline in V. For 1D curves, this is ignored.
vinc	Stepping increment for integration in V

template<typename T >

void GA_ForwardDifference< T >::walk	(	const GA_ROGenericHandleVertex< T > &	gah,
		int	ucount,
		int	uoff,
		T *	results
	)

1D forward difference a hull into a curve

Parameters

gah	is the set of attributes to evaluate.
ucount	is the number of vertices to fill
uoff	Offset into the results. That is, the results will be stored in results[uoff]-results[uoff+ucount-1]
deriv	Nth Derivatives. When the hull and the results exist in different details, the derivatives are represented by the RHS in the gah (source mapping).
results	List of vertex offsets where the result should be stored. When the hull and results are in different details, the results are the LHS of the gah (destination mapping).

template<typename T >

void GA_ForwardDifference< T >::walk	(	const GA_ROGenericHandleVertex< T > &	gah,
		int	ucount,
		int	vcount,
		int	uoff,
		int	voff,
		int	ncols,
		T *	results
	)

2D forward difference a hull into a mesh

Parameters

gah	is the set of attributes to evaluate.
ucount	is the number of vertices to fill in U (columns)
vcount	is the number of vertices to fill in V (rows)
uoff	Offset into the results (stride).
voff	Offset into the results (stride).
ncols	Number of columns in the full matrix of result vertices. This is used to stride into the offsets/rows.
deriv	Nth Derivatives. When the hull and the results exist in different details, the derivatives are represented by the RHS in the gah (source mapping).
results	List of vertex offsets where the result should be stored. When the hull and results are in different details, the results are the LHS of the gah (destination mapping).

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The documentation for this class was generated from the following file:

• GA/GA_ForwardDifference.h