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vtkKochanekSpline Class Reference

computes an interpolating spline using a Kochanek basis. More...

#include <vtkKochanekSpline.h>

Inheritance diagram for vtkKochanekSpline:

[legend]Collaboration diagram for vtkKochanekSpline:

[legend]List of all members.

Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	Compute ()
float	Evaluate (float t)
virtual void	SetDefaultBias (float)
virtual float	GetDefaultBias ()
virtual void	SetDefaultTension (float)
virtual float	GetDefaultTension ()
virtual void	SetDefaultContinuity (float)
virtual float	GetDefaultContinuity ()
Static Public Methods
int	IsTypeOf (const char *type)
vtkKochanekSpline *	SafeDownCast (vtkObject *o)
vtkKochanekSpline *	New ()
Protected Methods
	vtkKochanekSpline ()
	~vtkKochanekSpline ()
	vtkKochanekSpline (const vtkKochanekSpline &)
void	operator= (const vtkKochanekSpline &)
void	Fit1D (int n, float *x, float *y, float tension, float bias, float continuity, float coefficients[][4], int leftConstraint, float leftValue, int rightConstraint, float rightValue)
Protected Attributes
float	DefaultBias
float	DefaultTension
float	DefaultContinuity

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Detailed Description

computes an interpolating spline using a Kochanek basis.

Date:

2000/12/10 20:08:41

Revision:

1.16

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

Examples:

vtkKochanekSpline (examples)

Definition at line 80 of file vtkKochanekSpline.h.

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Constructor & Destructor Documentation

vtkKochanekSpline::vtkKochanekSpline (    )  [protected]

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

Definition at line 110 of file vtkKochanekSpline.h.

vtkKochanekSpline::vtkKochanekSpline (  const vtkKochanekSpline &    )  [inline, protected]

Definition at line 111 of file vtkKochanekSpline.h.

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Member Function Documentation

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

Return the class name as a string. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkSpline.

int vtkKochanekSpline::IsTypeOf (  const char *    type )  [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 vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkSpline.

virtual int vtkKochanekSpline::IsA (  const char *    type )  [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 vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkSpline.

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

Will cast the supplied object to vtkObject* is this is a safe operation (i.e., a safe downcast); otherwise NULL is returned. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h. 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.

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. Reimplemented from vtkSpline.

float vtkKochanekSpline::Evaluate (  float    t )

Evaluate a 1D Kochanek spline.

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

Set the bias for all points. Default is 0.

virtual float vtkKochanekSpline::GetDefaultBias (    )  [virtual]

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

Set the tension for all points. Default is 0.

virtual float vtkKochanekSpline::GetDefaultTension (    )  [virtual]

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

Set the continuity for all points. Default is 0.

virtual float vtkKochanekSpline::GetDefaultContinuity (    )  [virtual]

void vtkKochanekSpline::operator= (  const vtkKochanekSpline &    )  [inline, protected]

Definition at line 112 of file vtkKochanekSpline.h.

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

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Member Data Documentation

float vtkKochanekSpline::DefaultBias [protected]

Definition at line 118 of file vtkKochanekSpline.h.

float vtkKochanekSpline::DefaultTension [protected]

Definition at line 119 of file vtkKochanekSpline.h.

float vtkKochanekSpline::DefaultContinuity [protected]

Definition at line 120 of file vtkKochanekSpline.h.

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

• graphics/vtkKochanekSpline.h

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