libcruft-util/geom/aabb.hpp

85 lines
2.4 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2015-2017 Danny Robson <danny@nerdcruft.net>
*/
#ifndef CRUFT_UTIL_GEOM_AABB_HPP
#define CRUFT_UTIL_GEOM_AABB_HPP
#include "../point.hpp"
#include "../extent.hpp"
#include <cstdint>
namespace util::geom {
///////////////////////////////////////////////////////////////////////////
/// represents an axis-aligned bounding-box through two opposing corners.
///
/// p0 must be less-than-or-equal to p1. equality is allowed so that we
/// can represent zero sized bounding-boxes.
template <size_t S, typename T>
struct aabb {
aabb () = default;
aabb (point<S,T>, point<S,T>);
extent<S,T> magnitude (void) const;
T diameter (void) const;
/// tests whether a point lies within the region, inclusive of borders
constexpr bool
inclusive (point<S,T> p) const noexcept
{ return all (p0 <= p && p1 >= p); }
point<S,T> closest (point<S,T>) const;
aabb<S,T> expand (util::vector<S,T>) const noexcept;
aabb<S,T> expand (T) const noexcept;
aabb<S,T> contract (util::vector<S,T>) const noexcept;
aabb<S,T> contract (T) const noexcept;
void cover (point<S,T>);
aabb<S,T> operator+ (vector<S,T>) const;
aabb<S,T> operator- (vector<S,T>) const;
point<S,T> p0;
point<S,T> p1;
};
///////////////////////////////////////////////////////////////////////////
template <std::size_t S, typename T>
constexpr bool
operator== (const aabb<S,T> &a, const aabb<S,T> &b) noexcept
{
return a.p0 == b.p0 && a.p1 == b.p1;
}
///////////////////////////////////////////////////////////////////////////
typedef aabb<2,float> aabb2f;
typedef aabb<2,unsigned> aabb2u;
typedef aabb<2,int> aabb2i;
typedef aabb<3,float> aabb3f;
typedef aabb<3,unsigned> aabb3u;
typedef aabb<3,int> aabb3i;
}
#include "aabb.ipp"
#endif