Ball.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2019 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.
 *
 * Part of this file comes from SFML, with the same license:
 * Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
 */
#ifndef GF_BALL_H
#define GF_BALL_H

#include "Portability.h"
#include "Vector.h"
#include "VectorOps.h"

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

  template<typename T, std::size_t N>
  struct Ball {
    Vector<T, N> center; 
    T radius; 

    constexpr Ball() noexcept
    : center(gf::Zero)
    , radius(T(0))
    {
    }

    constexpr Ball(const Vector<T, N>& ballCenter, T ballRadius) noexcept
    : center(ballCenter)
    , radius(ballRadius)
    {

    }

    constexpr Vector<T, N> getCenter() const noexcept {
      return center;
    }

    constexpr T getRadius() const noexcept {
      return radius;
    }

    constexpr bool isEmpty() const noexcept {
      return radius == T(0);
    }

    inline bool contains(const Vector<T, N>& point) const noexcept {
      return gf::squareDistance(center, point) <= gf::square(radius);
    }

    inline bool intersects(const Ball<T, N>& other) const noexcept {
      return gf::squareDistance(center, other.center) <= gf::square(radius + other.radius);
    }

  };

  template<typename T, std::size_t N>
  constexpr
  bool operator==(const Ball<T, N>& lhs, const Ball<T, N>& rhs) {
    return lhs.center == rhs.center && lhs.radius == rhs.radius;
  }

  template<typename T, std::size_t N>
  constexpr
  bool operator!=(const Ball<T, N>& lhs, const Ball<T, N>& rhs) {
    return lhs.center != rhs.center || lhs.radius != rhs.radius;
  }

  template<typename Archive, typename T, std::size_t N>
  Archive& operator|(Archive& ar, Ball<T, N>& ball) {
    return ar | ball.center | ball.radius;
  }

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}


#endif // GF_BALL_H