Curves.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2021 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