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121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkKochanekSpline.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkKochanekSpline
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* @brief computes an interpolating spline using a Kochanek basis.
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*
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* Implements the Kochanek interpolating spline described in: Kochanek, D.,
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* Bartels, R., "Interpolating Splines with Local Tension, Continuity, and
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* Bias Control," Computer Graphics, vol. 18, no. 3, pp. 33-41, July 1984.
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* These splines give the user more control over the shape of the curve than
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* the cardinal splines implemented in vtkCardinalSpline. Three parameters
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* can be specified. All have a range from -1 to 1.
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*
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* Tension controls how sharply the curve bends at an input point. A
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* value of -1 produces more slack in the curve. A value of 1 tightens
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* the curve.
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*
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* Continuity controls the continuity of the first derivative at input
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* points.
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*
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* Bias controls the direction of the curve at it passes through an input
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* point. A value of -1 undershoots the point while a value of 1
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* overshoots the point.
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*
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* These three parameters give the user broad control over the shape of
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* the interpolating spline. The original Kochanek paper describes the
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* effects nicely and is recommended reading.
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*
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* @sa
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* vtkSpline vtkCardinalSpline
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*/
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#ifndef vtkKochanekSpline_h
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#define vtkKochanekSpline_h
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#include "vtkCommonComputationalGeometryModule.h" // For export macro
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#include "vtkSpline.h"
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class VTKCOMMONCOMPUTATIONALGEOMETRY_EXPORT vtkKochanekSpline : public vtkSpline
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{
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public:
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vtkTypeMacro(vtkKochanekSpline,vtkSpline);
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void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
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/**
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* Construct a KochanekSpline with the following defaults: DefaultBias = 0,
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* DefaultTension = 0, DefaultContinuity = 0.
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*/
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static vtkKochanekSpline *New();
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/**
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* Compute Kochanek Spline coefficients.
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*/
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void Compute () VTK_OVERRIDE;
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/**
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* Evaluate a 1D Kochanek spline.
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*/
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double Evaluate (double t) VTK_OVERRIDE;
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//@{
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/**
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* Set the bias for all points. Default is 0.
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*/
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vtkSetMacro(DefaultBias,double);
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vtkGetMacro(DefaultBias,double);
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//@}
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//@{
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/**
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* Set the tension for all points. Default is 0.
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*/
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vtkSetMacro(DefaultTension,double);
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vtkGetMacro(DefaultTension,double);
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//@}
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//@{
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/**
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* Set the continuity for all points. Default is 0.
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*/
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vtkSetMacro(DefaultContinuity,double);
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vtkGetMacro(DefaultContinuity,double);
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//@}
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/**
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* Deep copy of cardinal spline data.
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*/
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void DeepCopy(vtkSpline *s) VTK_OVERRIDE;
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protected:
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vtkKochanekSpline();
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~vtkKochanekSpline() VTK_OVERRIDE {}
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void Fit1D (int n, double *x, double *y, double tension, double bias,
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double continuity, double coefficients[][4], int leftConstraint,
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double leftValue, int rightConstraint, double rightValue);
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double DefaultBias;
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double DefaultTension;
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double DefaultContinuity;
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private:
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vtkKochanekSpline(const vtkKochanekSpline&) VTK_DELETE_FUNCTION;
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void operator=(const vtkKochanekSpline&) VTK_DELETE_FUNCTION;
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};
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#endif
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