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 GLUNIFORMCUBICBSPLINE_H_ 00022 #define GLUNIFORMCUBICBSPLINE_H_ 00023 00024 #include <tulip/AbstractGlCurve.h> 00025 00026 namespace tlp { 00027 00028 /** 00029 * @ingroup OpenGL 00030 * @brief A class to draw open uniform cubic B-splines 00031 * 00032 * A B-spline is a convenient form for representing complicated, smooth curves. A cubic uniform B-spline is a 00033 * piecewise collection of cubic Bezier curves, connected end to end. A cubic B-spline is C^2 continuous, meaning there is no discontinuities in curvature. 00034 * B-splines have local control : parameters of a B-spline only affect a small part of the entire spline. 00035 * A B-spline is qualified as open when it passes through its first and last control points. 00036 * 00037 */ 00038 class TLP_GL_SCOPE GlOpenUniformCubicBSpline : public AbstractGlCurve { 00039 00040 public: 00041 00042 /** 00043 * @brief Constructor 00044 * @warning Don't use it, see other construstor 00045 */ 00046 GlOpenUniformCubicBSpline(); 00047 00048 /** 00049 * @brief GlOpenUniformCubicBSpline constructor 00050 * 00051 * @param controlPoints a vector of control points (size must be greater or equal to 4) 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 GlOpenUniformCubicBSpline(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 ~GlOpenUniformCubicBSpline(); 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 void setCurveVertexShaderRenderingSpecificParameters(); 00068 00069 Coord computeCurvePointOnCPU(const std::vector<Coord> &controlPoints, float t); 00070 00071 void computeCurvePointsOnCPU(const std::vector<Coord> &controlPoints, std::vector<Coord> &curvePoints, unsigned int nbCurvePoints); 00072 00073 private: 00074 00075 unsigned nbKnots; 00076 float stepKnots; 00077 00078 }; 00079 00080 } 00081 00082 #endif