vtkKochanekSpline Class Reference

#include <vtkKochanekSpline.h>

Inheritance diagram for vtkKochanekSpline:

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Collaboration diagram for vtkKochanekSpline:

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List of all members.

Detailed Description

computes an interpolating spline using a Kochanek basis.

Implements the Kochenek interpolating spline described in: Kochanek, D., Bartels, R., "Interpolating Splines with Local Tension, Continuity, and Bias Control," Computer Graphics, vol. 18, no. 3, pp. 33-41, July 1984. These splines give the user more control over the shape of the curve than the cardinal splines implemented in vtkCardinalSpline. Three parameters can be specified. All have a range from -1 to 1.

Tension controls how sharply the curve bends at an input point. A value of -1 produces more slack in the curve. A value of 1 tightens the curve.

Continuity controls the continuity of the first derivative at input points.

Bias controls the direction of the curve at it passes through an input point. A value of -1 undershoots the point while a value of 1 overshoots the point.

These three parameters give the user broad control over the shape of the interpolating spline. The original Kochanek paper describes the effects nicely and is recommended reading.

See also:: vtkSpline vtkCardinalSpline

Tests:: vtkKochanekSpline (Tests)

Definition at line 52 of file vtkKochanekSpline.h.


Public Types
typedef vtkSpline	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	Compute ()
double	Evaluate (double t)
virtual void	DeepCopy (vtkSpline *s)

virtual void	SetDefaultBias (double)
virtual double	GetDefaultBias ()

virtual void	SetDefaultTension (double)
virtual double	GetDefaultTension ()

virtual void	SetDefaultContinuity (double)
virtual double	GetDefaultContinuity ()
Static Public Member Functions
static int	IsTypeOf (const char *type)
static vtkKochanekSpline *	SafeDownCast (vtkObject *o)
static vtkKochanekSpline *	New ()
Protected Member Functions
	vtkKochanekSpline ()
	~vtkKochanekSpline ()
void	Fit1D (int n, double x, double y, double tension, double bias, double continuity, double coefficients[][4], int leftConstraint, double leftValue, int rightConstraint, double rightValue)
Protected Attributes
double	DefaultBias
double	DefaultTension
double	DefaultContinuity

Member Typedef Documentation

typedef vtkSpline vtkKochanekSpline::Superclass

Reimplemented from vtkSpline.

Definition at line 55 of file vtkKochanekSpline.h.

Constructor & Destructor Documentation

vtkKochanekSpline::vtkKochanekSpline ( ) [protected]

vtkKochanekSpline::~vtkKochanekSpline ( ) [inline, protected]

Definition at line 91 of file vtkKochanekSpline.h.

Member Function Documentation

virtual const char* vtkKochanekSpline::GetClassName ( ) [virtual]

Reimplemented from vtkSpline.

static int vtkKochanekSpline::IsTypeOf ( const char * name ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkSpline.

virtual int vtkKochanekSpline::IsA ( const char * name ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkSpline.

static vtkKochanekSpline* vtkKochanekSpline::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkSpline.

void vtkKochanekSpline::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			`[virtual]`

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkSpline.

static vtkKochanekSpline* vtkKochanekSpline::New ( ) [static]

Construct a KochanekSpline with the following defaults: DefaultBias = 0, DefaultTension = 0, DefaultContinuity = 0.

Reimplemented from vtkObject.

void vtkKochanekSpline::Compute ( ) [virtual]

Compute Kochanek Spline coefficients.

Implements vtkSpline.

double vtkKochanekSpline::Evaluate ( double t ) [virtual]

Evaluate a 1D Kochanek spline.

Implements vtkSpline.

virtual void vtkKochanekSpline::SetDefaultBias ( double ) [virtual]

Set the bias for all points. Default is 0.

virtual double vtkKochanekSpline::GetDefaultBias ( ) [virtual]

Set the bias for all points. Default is 0.

virtual void vtkKochanekSpline::SetDefaultTension ( double ) [virtual]

Set the tension for all points. Default is 0.

virtual double vtkKochanekSpline::GetDefaultTension ( ) [virtual]

Set the tension for all points. Default is 0.

virtual void vtkKochanekSpline::SetDefaultContinuity ( double ) [virtual]

Set the continuity for all points. Default is 0.

virtual double vtkKochanekSpline::GetDefaultContinuity ( ) [virtual]

Set the continuity for all points. Default is 0.

virtual void vtkKochanekSpline::DeepCopy ( vtkSpline * s ) [virtual]

Deep copy of cardinal spline data.

Reimplemented from vtkSpline.

void vtkKochanekSpline::Fit1D	(	int	n,
		double *	x,
		double *	y,
		double	tension,
		double	bias,
		double	continuity,
		double	coefficients[][4],
		int	leftConstraint,
		double	leftValue,
		int	rightConstraint,
		double	rightValue
	)			`[protected]`