Geometry.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_GEOMETRY_H
#define GF_GEOMETRY_H

#include <vector>

#include "CoreApi.h"
#include "GeometryTypes.h"
#include "Heightmap.h"
#include "Polygon.h"
#include "Polyline.h"
#include "Random.h"
#include "Span.h"
#include "Vector.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class GF_CORE_API Bresenham {
  public:
    Bresenham(Vector2i p0, Vector2i p1);

    bool step(Vector2i& res);

  private:
    Vector2i m_p0;
    Vector2i m_p1;
    Vector2i m_delta;
    Vector2i m_step;
    int m_error;
  };

  GF_CORE_API std::vector<Vector2i> generateLine(Vector2i p0, Vector2i p1);

  GF_CORE_API std::vector<Vector2f> midpointDisplacement1D(Vector2f p0, Vector2f p1, Random& random, unsigned iterations, Vector2f direction, float initialFactor = 1.0f, float reductionFactor = 0.5f);

  GF_CORE_API std::vector<Vector2f> midpointDisplacement1D(Vector2f p0, Vector2f p1, Random& random, unsigned iterations, float initialFactor = 1.0f, float reductionFactor = 0.5f);


  GF_CORE_API Heightmap midpointDisplacement2D(Vector2i size, Random& random, Span<const double> initialValues = nullptr);


  GF_CORE_API Heightmap diamondSquare2D(Vector2i size, Random& random, Span<const double> initialValues = nullptr);


  GF_CORE_API Polygon convexHull(Span<const Vector2f> points);


  GF_CORE_API std::vector<Vector2f> simplifyPoints(Span<const Vector2f> points, float distance = Epsilon);


  GF_CORE_API std::vector<Polyline> buildLines(Span<const SegmentI> segments);


#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_GEOMETRY_H