sbguicubicspline.h

学习 open inventor 的例子

#ifndef SOGUIEXAMPLES_SBGUICUBICSPLINE_H
#define SOGUIEXAMPLES_SBGUICUBICSPLINE_H

/**************************************************************************\
 *
 *  This file is part of the SmallChange extension library for Coin.
 *  Copyright (C) 1998-2002 by Systems in Motion.  All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  version 2 as published by the Free Software Foundation.  See the
 *  file LICENSE.GPL at the root directory of this source distribution
 *  for more details.
 *
 *  If you desire to use SmallChange with software that is incompatible
 *  licensewise with the GPL, and / or you would like to take
 *  advantage of the additional benefits with regard to our support
 *  services, please contact Systems in Motion about acquiring a Coin
 *  Professional Edition License.  See <URL:http://www.coin3d.org> for
 *  more information.
 *
 *  Systems in Motion, Prof Brochs gate 6, 7030 Trondheim, NORWAY
 *  <URL:http://www.sim.no>, <mailto:[e-mail]>
 *
\**************************************************************************/

#include "../qtsupport.h"
#include <Inventor/SbLinear.h>

// *************************************************************************

class SbGuiCubicSpline {
public:
  SbGuiCubicSpline(const int approxcount = 256);
  ~SbGuiCubicSpline();

  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;

  QValueVector<SbVec4f> ctrlpts;
  QValueVector<float> segstarttimes;
  QValueVector<float> segdurations;
  QValueVector<float> seglens;

  SbBool needinit;
  SbBool loop;
  int approxcount;
  int currsegment;
  SbMatrix currmatrix;
  SbMatrix basismatrix;
};

// *************************************************************************

#endif // !SOGUIEXAMPLES_SBGUICUBICSPLINE_H