Tulip
4.6.0
Better Visualization Through Research
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00001 /* 00002 * 00003 * This file is part of Tulip (www.tulip-software.org) 00004 * 00005 * Authors: David Auber and the Tulip development Team 00006 * from LaBRI, University of Bordeaux 00007 * 00008 * Tulip is free software; you can redistribute it and/or modify 00009 * it under the terms of the GNU Lesser General Public License 00010 * as published by the Free Software Foundation, either version 3 00011 * of the License, or (at your option) any later version. 00012 * 00013 * Tulip is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 00016 * See the GNU General Public License for more details. 00017 * 00018 */ 00019 00020 00021 #ifndef GLBEZIERCURVE_H_ 00022 #define GLBEZIERCURVE_H_ 00023 00024 #include <tulip/AbstractGlCurve.h> 00025 00026 namespace tlp { 00027 00028 /** 00029 * @ingroup OpenGL 00030 * @brief A class to draw Bezier curves 00031 * 00032 * This class allows to draw Bezier curves defined by an arbitrary number of control points. 00033 * Bezier curves are named after their inventor, Dr. Pierre Bezier. He was an engineer with the 00034 * Renault car company and set out in the early 1960's to develop a curve formulation which would 00035 * lend itself to shape design. 00036 * Bezier curves are widely used in computer graphics to model smooth curves. A Bezier curve is 00037 * completely contained in the convex hull of its control points and passes through its first and 00038 * last control points. The curve is also always tangent to the first and last convex hull polygon segments. 00039 * In addition, the curve shape tends to follow the polygon shape. 00040 * 00041 */ 00042 class TLP_GL_SCOPE GlBezierCurve : public AbstractGlCurve { 00043 00044 public: 00045 00046 GlBezierCurve(); 00047 00048 /** 00049 * @brief GlBezierCurve constructor 00050 * 00051 * @param controlPoints a vector of control points (size must be greater or equal to 2) 00052 * @param startColor the color at the start of the curve 00053 * @param endColor the color at the end of the curve 00054 * @param startSize the width at the start of the curve 00055 * @param endSize the width at the end of the curve 00056 * @param nbCurvePoints the number of curve points to generate 00057 */ 00058 GlBezierCurve(const std::vector<Coord> &controlPoints, const Color &startColor, const Color &endColor, 00059 const float &startSize, const float &endSize, const unsigned int nbCurvePoints = 200); 00060 00061 ~GlBezierCurve(); 00062 00063 void drawCurve(std::vector<Coord> &controlPoints, const Color &startColor, const Color &endColor, const float startSize, const float endSize, const unsigned int nbCurvePoints=200); 00064 00065 protected : 00066 00067 Coord computeCurvePointOnCPU(const std::vector<Coord> &controlPoints, float t); 00068 00069 void computeCurvePointsOnCPU(const std::vector<Coord> &controlPoints, std::vector<Coord> &curvePoints, unsigned int nbCurvePoints); 00070 00071 std::string genCurveVertexShaderSpecificCode(); 00072 00073 }; 00074 00075 } 00076 #endif /* GLBEZIERCURVE_H_ */