NurbsBasisVector Class Reference

This encapsulates a series of matrices that are used to represent the sequential segments of a NurbsCurveEvaluator. More...

#include "nurbsBasisVector.h"

Public Member Functions
void	append_segment (int vertex_index, const PN_stdfloat knots[])
	Computes a NURBS basis for one segment of the curve and appends it to the set of basis matrices. More...
void	clear (int order)
	Removes all the segments from the curve. More...
const LMatrix4 &	get_basis (int segment) const
	Returns the basis matrix associated with the nth segment. More...
PN_stdfloat	get_end_t () const
	Returns the last legal value of t on the curve. More...
PN_stdfloat	get_from (int segment) const
	Returns the t value of the beginning of this segment. More...
int	get_num_segments () const
	Returns the number of piecewise continuous segments in the curve. More...
int	get_order () const
	Returns the order of the segments in the curve. More...
PN_stdfloat	get_start_t () const
	Returns the first legal value of t on the curve. More...
PN_stdfloat	get_to (int segment) const
	Returns the t value of the end of this segment. More...
int	get_vertex_index (int segment) const
	Returns the vertex index of the nth segment. More...
PN_stdfloat	scale_t (int segment, PN_stdfloat t) const
	Scales the value of t into the range [0, 1] corresponding to [from, to]. More...
void	transpose ()
	Transposes the basis matrices stored in the vector. More...

Detailed Description

This encapsulates a series of matrices that are used to represent the sequential segments of a NurbsCurveEvaluator.

This is not related to NurbsCurve, CubicCurveseg or any of the ParametricCurve-derived objects in this module. It is a completely parallel implementation of NURBS curves, and will probably eventually replace the whole ParametricCurve class hierarchy.

Definition at line 33 of file nurbsBasisVector.h.

Member Function Documentation

append_segment()

void NurbsBasisVector::append_segment	(	int	vertex_index,
		const PN_stdfloat	knots[]
	)

Computes a NURBS basis for one segment of the curve and appends it to the set of basis matrices.

Definition at line 30 of file nurbsBasisVector.cxx.

clear()

void NurbsBasisVector::clear

(

int

order

)

Removes all the segments from the curve.

Definition at line 20 of file nurbsBasisVector.cxx.

get_basis()

const LMatrix4 & NurbsBasisVector::get_basis ( int  segment ) const

inline

Returns the basis matrix associated with the nth segment.

This is the pure matrix based on the knot vector over the segment; it does not depend on the control vertices.

Definition at line 98 of file nurbsBasisVector.I.

get_end_t()

PN_stdfloat NurbsBasisVector::get_end_t ( ) const

inline

Returns the last legal value of t on the curve.

Definition at line 58 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::get_end_t(), NurbsSurfaceResult::get_end_u(), and NurbsSurfaceResult::get_end_v().

get_from()

PN_stdfloat NurbsBasisVector::get_from ( int  segment ) const

inline

Returns the t value of the beginning of this segment.

Definition at line 78 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::adaptive_sample(), NurbsCurveResult::get_segment_t(), and NurbsSurfaceResult::get_segment_u().

get_num_segments()

int NurbsBasisVector::get_num_segments ( ) const

inline

Returns the number of piecewise continuous segments in the curve.

Definition at line 41 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::adaptive_sample(), NurbsCurveResult::get_num_segments(), NurbsCurveEvaluator::get_num_segments(), NurbsSurfaceResult::get_num_u_segments(), NurbsSurfaceEvaluator::get_num_u_segments(), NurbsSurfaceResult::get_num_v_segments(), NurbsSurfaceEvaluator::get_num_v_segments(), and NurbsCurveResult::NurbsCurveResult().

get_order()

int NurbsBasisVector::get_order ( ) const

inline

Returns the order of the segments in the curve.

Definition at line 33 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::NurbsCurveResult().

get_start_t()

PN_stdfloat NurbsBasisVector::get_start_t ( ) const

inline

Returns the first legal value of t on the curve.

Usually this is 0.0.

Definition at line 49 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::get_start_t(), NurbsSurfaceResult::get_start_u(), and NurbsSurfaceResult::get_start_v().

get_to()

PN_stdfloat NurbsBasisVector::get_to ( int  segment ) const

inline

Returns the t value of the end of this segment.

Definition at line 87 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::get_segment_t(), and NurbsSurfaceResult::get_segment_u().

get_vertex_index()

int NurbsBasisVector::get_vertex_index ( int  segment ) const

inline

Returns the vertex index of the nth segment.

This is the index number of the first associated control vertex within the source NurbsCurveEvaluator object.

Definition at line 69 of file nurbsBasisVector.I.

scale_t()

PN_stdfloat NurbsBasisVector::scale_t ( int  segment, PN_stdfloat  t  ) const

inline

Scales the value of t into the range [0, 1] corresponding to [from, to].

Returns the scaled value.

Definition at line 108 of file nurbsBasisVector.I.

Referenced by NurbsCurveResult::eval_extended_point(), NurbsCurveResult::eval_extended_points(), NurbsCurveResult::eval_point(), and NurbsCurveResult::eval_tangent().

transpose()

void NurbsBasisVector::transpose

(

)

Transposes the basis matrices stored in the vector.

Definition at line 64 of file nurbsBasisVector.cxx.

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

• panda/src/parametrics/nurbsBasisVector.h
• panda/src/parametrics/nurbsBasisVector.cxx
• panda/src/parametrics/nurbsBasisVector.I