sphere.hpp

// SPDX-License-Identifier: MIT
#ifndef LIBSBX_MATH_SPHERE_HPP_
#define LIBSBX_MATH_SPHERE_HPP_
 
#include <libsbx/math/concepts.hpp>
#include <libsbx/math/vector3.hpp>
 
namespace sbx::math {
 
template<scalar Type>
class basic_sphere {
 
public:
 
  using value_type = Type;
  using vector_type = basic_vector3<value_type>;
 
  basic_sphere() noexcept = default;
 
  basic_sphere(const vector_type& center, const value_type radius) noexcept
  : _center{center}, 
    _radius{radius} { }
 
  static auto transformed(const basic_sphere& sphere, const math::matrix4x4& matrix) -> basic_sphere {
    // [NOTE] KAJ 2025-04-28 : We may need to add a scale factor to the radius here.
    const auto transformed_center = math::vector3{matrix * math::vector4{sphere._center, 1.0f}};
    return basic_sphere{transformed_center, sphere._radius};
  }
 
  auto center() const noexcept -> const vector_type& {
    return _center;
  }
 
  auto radius() const noexcept -> value_type {
    return _radius;
  }
 
private:
 
  vector_type _center;
  value_type _radius;
 
}; // class basic_sphere
 
using spheref = basic_sphere<std::float_t>;
 
using sphere = spheref;
 
} // namespace sbx::math
 
#endif // LIBSBX_MATH_SPHERE_HPP_