SbCubicSpline.h

#ifndef COIN_SBCUBICSPLINE_H
#define COIN_SBCUBICSPLINE_H
 
/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * this software without specific prior written permission.
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\**************************************************************************/
 
#include <Inventor/lists/SbList.h>
#include <Inventor/SbMatrix.h>
#include <Inventor/SbVec3f.h>
#include <Inventor/SbVec4f.h>
 
#include <SmallChange/basic.h>
 
 
class SMALLCHANGE_DLL_API SbCubicSpline {
public:
  SbCubicSpline(const int approxcount = 256);
  ~SbCubicSpline();
 
  enum Type {
    CATMULL_ROM = 0,
    B_SPLINE,
    BEZIER
  };
  
  void setBasisMatrix(const Type type);
  void setBasisMatrix(const SbMatrix & m);
  const SbMatrix & getBasisMatrix(void) const;
  void setLoop(const SbBool loop);
  void setControlPoints(const SbVec3f * ptr, const int num);
  void setControlPoints(const SbVec4f * pts, const int num);
 
  // runtime
 
  SbVec3f getPoint(const float t);
  SbVec3f getTangent(const float t);
  int getSegmentInfo(const float t, float & segt) const;
  float getSegmentLength(const int idx);
 
private:
 
  int getSegdata(const float t, float & segt);
  SbVec3f getPoint(const SbMatrix & m, const float t);
  SbVec3f getTangent(const SbMatrix & m, const float t);
  void initMatrix(const int seg, SbMatrix & m);
  void initialize(void);
  int getSegnum(const float time) const;
  int clampSegnum(const int q) const;
 
  SbList <SbVec4f> ctrlpts;
  SbList <float> segstarttimes;
  SbList <float> segdurations;
  SbList <float> seglens;
 
  SbBool needinit;
  SbBool loop;
  int approxcount;
  int currsegment;
  SbMatrix currmatrix;
  SbMatrix basismatrix;
};
 
 
#endif // COIN_SBCUBICSPLINE_H