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vtkKochanekSpline Class Reference

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

#include <vtkKochanekSpline.h>

Inheritance diagram for vtkKochanekSpline:

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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

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)


Member Function Documentation

void vtkKochanekSpline::Compute   [virtual]
 

Compute Kochanek Spline coefficients.

Implements vtkSpline.

float vtkKochanekSpline::Evaluate float    t
 

Evaluate a 1D Kochanek spline.

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.

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.

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.

vtkKochanekSpline* vtkKochanekSpline::New   [static]
 

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

Reimplemented from vtkObject.

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::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.

virtual void vtkKochanekSpline::SetDefaultBias float    [virtual]
 

Set the bias for all points. Default is 0.

virtual void vtkKochanekSpline::SetDefaultContinuity float    [virtual]
 

Set the continuity for all points. Default is 0.

virtual void vtkKochanekSpline::SetDefaultTension float    [virtual]
 

Set the tension for all points. Default is 0.


The documentation for this class was generated from the following file:
Generated on Tue Mar 19 13:28:26 2002 for VTK by doxygen1.2.14 written by Dimitri van Heesch, © 1997-2002