/usr/include/tulip/GlBezierCurve.h is in libtulip-dev 4.8.0dfsg-2+b7.
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 GLBEZIERCURVE_H_
#define GLBEZIERCURVE_H_
#include <tulip/AbstractGlCurve.h>
namespace tlp {
/**
* @ingroup OpenGL
* @brief A class to draw Bezier curves
*
* This class allows to draw Bezier curves defined by an arbitrary number of control points.
* Bezier curves are named after their inventor, Dr. Pierre Bezier. He was an engineer with the
* Renault car company and set out in the early 1960's to develop a curve formulation which would
* lend itself to shape design.
* Bezier curves are widely used in computer graphics to model smooth curves. A Bezier curve is
* completely contained in the convex hull of its control points and passes through its first and
* last control points. The curve is also always tangent to the first and last convex hull polygon segments.
* In addition, the curve shape tends to follow the polygon shape.
*
*/
class TLP_GL_SCOPE GlBezierCurve : public AbstractGlCurve {
public:
GlBezierCurve();
/**
* @brief GlBezierCurve constructor
*
* @param controlPoints a vector of control points (size must be greater or equal to 2)
* @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
*/
GlBezierCurve(const std::vector<Coord> &controlPoints, const Color &startColor, const Color &endColor,
const float &startSize, const float &endSize, const unsigned int nbCurvePoints = 200);
~GlBezierCurve();
void drawCurve(std::vector<Coord> &controlPoints, const Color &startColor, const Color &endColor, const float startSize, const float endSize, const unsigned int nbCurvePoints=200);
protected :
Coord computeCurvePointOnCPU(const std::vector<Coord> &controlPoints, float t);
void computeCurvePointsOnCPU(const std::vector<Coord> &controlPoints, std::vector<Coord> &curvePoints, unsigned int nbCurvePoints);
std::string genCurveVertexShaderSpecificCode();
};
}
#endif /* GLBEZIERCURVE_H_ */
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