Curves.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2022 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_CURVES_H
#define GF_CURVES_H
 
#include <vector>
 
#include "Curve.h"
#include "GraphicsApi.h"
#include "Polyline.h"
 
namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif
 
  class GF_GRAPHICS_API Line : public Curve {
  public:
    Line(Vector2f p0, Vector2f p1);
 
    std::size_t getPointCount() const override;
 
    Vector2f getPoint(std::size_t index) const override;
 
  private:
    Vector2f m_p0;
    Vector2f m_p1;
  };
 
  class GF_GRAPHICS_API QuadraticBezierCurve : public Curve {
  public:
    QuadraticBezierCurve(Vector2f p0, Vector2f p1, Vector2f p2, std::size_t pointCount = 20);
 
    std::size_t getPointCount() const override;
 
    Vector2f getPoint(std::size_t index) const override;
 
  private:
    std::size_t m_pointCount;
    Vector2f m_p0;
    Vector2f m_p1;
    Vector2f m_p2;
  };
 
  class GF_GRAPHICS_API CubicBezierCurve : public Curve {
  public:
    CubicBezierCurve(Vector2f p0, Vector2f p1, Vector2f p2, Vector2f p3, std::size_t pointCount = 30);
 
    std::size_t getPointCount() const override;
 
    Vector2f getPoint(std::size_t index) const override;
 
  private:
    std::size_t m_pointCount;
    Vector2f m_p0;
    Vector2f m_p1;
    Vector2f m_p2;
    Vector2f m_p3;
  };
 
  class GF_GRAPHICS_API SplineCurve : public Curve {
  public:
    enum Type {
      Uniform, 
      Chordal, 
      Centripetal, 
    };
 
    SplineCurve(Type type = Centripetal, std::size_t pointCount = 30);
 
    void setControlPoints(const Polyline& line);
 
    std::size_t getPointCount() const override;
 
    Vector2f getPoint(std::size_t index) const override;
 
  private:
    Type m_type;
    std::size_t m_pointCount;
    std::vector<Vector2f> m_points;
  };
 
  class GF_GRAPHICS_API CompoundCurve : public Curve {
  public:
    CompoundCurve(Vector2f origin = Vector2f(0, 0));
 
    CompoundCurve& setOrigin(Vector2f origin);
 
    CompoundCurve& lineTo(Vector2f p1);
 
    CompoundCurve& quadraticCurveTo(Vector2f p1, Vector2f p2, std::size_t pointCount = 20);
 
    CompoundCurve& cubicCurveTo(Vector2f p1, Vector2f p2, Vector2f p3, std::size_t pointCount = 30);
 
    void close();
 
    CompoundCurve& clear(Vector2f origin = Vector2f(0, 0));
 
    std::size_t getPointCount() const override;
 
    Vector2f getPoint(std::size_t index) const override;
 
  private:
    std::vector<Vector2f> m_points;
  };
 
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}
 
#endif // GF_CURVES_H