/usr/include/tulip/GlOpenUniformCubicBSpline.h is in libtulip-dev 4.6.0dfsg-2+b5.
This file is owned by root:root, with mode 0o644.
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*
* This file is part of Tulip (www.tulip-software.org)
*
* Authors: David Auber and the Tulip development Team
* from LaBRI, University of Bordeaux
*
* Tulip is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Tulip is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
*/
#ifndef GLUNIFORMCUBICBSPLINE_H_
#define GLUNIFORMCUBICBSPLINE_H_
#include <tulip/AbstractGlCurve.h>
namespace tlp {
/**
* @ingroup OpenGL
* @brief A class to draw open uniform cubic B-splines
*
* A B-spline is a convenient form for representing complicated, smooth curves. A cubic uniform B-spline is a
* 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.
* B-splines have local control : parameters of a B-spline only affect a small part of the entire spline.
* A B-spline is qualified as open when it passes through its first and last control points.
*
*/
class TLP_GL_SCOPE GlOpenUniformCubicBSpline : public AbstractGlCurve {
public:
/**
* @brief Constructor
* @warning Don't use it, see other construstor
*/
GlOpenUniformCubicBSpline();
/**
* @brief GlOpenUniformCubicBSpline constructor
*
* @param controlPoints a vector of control points (size must be greater or equal to 4)
* @param startColor the color at the start of the curve
* @param endColor the color at the end of the curve
* @param startSize the width at the start of the curve
* @param endSize the width at the end of the curve
* @param nbCurvePoints the number of curve points to generate
*/
GlOpenUniformCubicBSpline(const std::vector<Coord> &controlPoints, const Color &startColor, const Color &endColor,
const float startSize, const float endSize, const unsigned int nbCurvePoints = 200);
~GlOpenUniformCubicBSpline();
void drawCurve(std::vector<Coord> &controlPoints, const Color &startColor, const Color &endColor, const float startSize, const float endSize, const unsigned int nbCurvePoints=200);
protected :
void setCurveVertexShaderRenderingSpecificParameters();
Coord computeCurvePointOnCPU(const std::vector<Coord> &controlPoints, float t);
void computeCurvePointsOnCPU(const std::vector<Coord> &controlPoints, std::vector<Coord> &curvePoints, unsigned int nbCurvePoints);
private:
unsigned nbKnots;
float stepKnots;
};
}
#endif
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