Fawkes API  Fawkes Development Version
spline.h
00001 
00002 /***************************************************************************
00003  *  spline.h - Cubic spline curve
00004  *
00005  *  Created: Tue Oct 07 18:57:42 2008
00006  *  Copyright  2008  Daniel Beck
00007  *
00008  ****************************************************************************/
00009 
00010 /*  This program is free software; you can redistribute it and/or modify
00011  *  it under the terms of the GNU General Public License as published by
00012  *  the Free Software Foundation; either version 2 of the License, or
00013  *  (at your option) any later version. A runtime exception applies to
00014  *  this software (see LICENSE.GPL_WRE file mentioned below for details).
00015  *
00016  *  This program is distributed in the hope that it will be useful,
00017  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  *  GNU Library General Public License for more details.
00020  *
00021  *  Read the full text in the LICENSE.GPL_WRE file in the doc directory.
00022  */
00023 
00024 #ifndef __GEOMETRY_SPLINE_H_
00025 #define __GEOMETRY_SPLINE_H_
00026 
00027 #include <geometry/transformable.h>
00028 #include <geometry/hom_point.h>
00029 #include <geometry/bezier.h>
00030 #include <vector>
00031 
00032 namespace fawkes {
00033 
00034 class SplineDrawer;
00035 
00036 class Spline : public Transformable
00037 {
00038   friend class fawkes::SplineDrawer;
00039   
00040  public:
00041   Spline();
00042   Spline(const std::vector<HomPoint>& control_points);
00043   virtual ~Spline();
00044 
00045   void set_control_points(const std::vector<HomPoint>& control_points);
00046   void set_control_point(unsigned int i, const HomPoint& p);
00047 
00048   const std::vector<HomPoint>& get_control_points() const;
00049   const std::vector<Bezier>&   get_bezier_curves() const;
00050 
00051   HomPoint  eval(unsigned int bezier_index, float t);
00052   HomVector tangent(unsigned int bezier_index, float t);
00053   HomVector tangent(unsigned int point_index);
00054   std::vector<HomPoint> approximate(unsigned int num_subdivisions = 4);
00055 
00056  protected:
00057   // transformable
00058   virtual void register_primitives();
00059   virtual void post_transform();
00060 
00061  private:
00062   void construct_bezier_curves();
00063 
00064   std::vector<HomPoint> m_control_points;
00065   std::vector<Bezier>   m_bezier_curves;
00066 
00067   unsigned int m_num_subdivisions;
00068 };
00069 
00070 }
00071 
00072 #endif /* __GEOMETRY_SPLINE_H_ */