Fawkes API Fawkes Development Version
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00001 00002 /*************************************************************************** 00003 * bezier.h - Bezier curve 00004 * 00005 * Created: Mon Oct 06 14:52:57 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_BEZIER_H_ 00025 #define __GEOMETRY_BEZIER_H_ 00026 00027 #include <geometry/transformable.h> 00028 #include <vector> 00029 00030 namespace fawkes { 00031 class HomPoint; 00032 class HomVector; 00033 00034 class Bezier : public Transformable 00035 { 00036 public: 00037 Bezier(); 00038 Bezier(const std::vector<HomPoint>& control_points); 00039 Bezier(const Bezier& b); 00040 ~Bezier(); 00041 00042 void set_control_points(const std::vector<HomPoint>& control_points); 00043 void set_control_point(unsigned int index, const HomPoint& control_point); 00044 00045 std::vector<HomPoint> get_control_points() const; 00046 HomPoint get_control_point(unsigned int i) const; 00047 00048 unsigned int degree() const; 00049 00050 HomPoint eval(float t); 00051 HomVector tangent_at_t(float t); 00052 HomVector tangent_at_point(unsigned int index); 00053 void subdivide(float t, Bezier& c, Bezier& d); 00054 const 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 init_dclj_array(); 00063 unsigned int get_dclj_array_index(unsigned int k, unsigned int i) const; 00064 00065 std::vector<HomPoint> m_control_points; 00066 std::vector<HomPoint> m_approximation; 00067 unsigned int m_num_subdivisions; 00068 00069 HomPoint de_casteljau(unsigned int k, unsigned int i, float t); 00070 00071 std::pair<HomPoint*, bool>* m_de_casteljau_points; 00072 unsigned int m_dclj_array_size; 00073 00074 unsigned int m_num_control_points; 00075 00076 float m_last_t; 00077 }; 00078 00079 } // end namespace fawkes 00080 00081 #endif /* __GEOMETRY_BEZIER_H_ */