libcruft-util/geom/ops.hpp

123 lines
2.8 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2015-2018 Danny Robson <danny@nerdcruft.net>
*/
#pragma once
#include "./fwd.hpp"
#include "../point.hpp"
#include <type_traits>
///////////////////////////////////////////////////////////////////////////////
namespace cruft::geom {
/// Tests whether any part of two shapes overlap.
///
/// Returns true even if the the edges of the shapes are co-linear.
template <
size_t S,
typename T,
template <size_t,typename> class A,
template <size_t,typename> class B
>
bool
intersects (A<S,T>, B<S,T>);
/// Tests whether the entirety of shape `B` is inclusively contained
/// within the shape `A`.
template <
size_t S,
typename T,
template<size_t,typename> class A,
template<size_t,typename> class B
>
bool covers (A<S,T> const&, B<S,T> const&);
/// Returns a minimum squared distance between two shapes.
template <
size_t S,
typename T,
template <size_t,typename> class A,
template <size_t,typename> class B
>
T
distance2 (A<S,T>, B<S,T>);
// disable distance for point-point arguments given it's already
// explicitly specified in the point header.
template <
size_t S,
typename T,
template <size_t,typename> class A,
template <size_t,typename> class B,
typename = std::enable_if_t<
!std::is_same_v<cruft::point<S,T>, A> &&
!std::is_same_v<cruft::point<S,T>, B>
>
>
T
distance (A<S,T>, B<S,T>);
/// Returns an AABB for the supplied shape.
template <
size_t S,
typename T,
template <size_t,typename> class K
>
aabb<S,T>
bounds (K<S,T>);
/// Returns a bounding AABB for all supplied items
template <typename... Args>
auto
bounds (Args &&...args)
{
return (bounds (args) | ...);
}
/// Returns a maximum distance across a shape.
template <
size_t S,
typename T,
template <size_t,typename> class K
>
T
diameter (K<S,T>);
/// Returns the closest point on a shape to the supplied point.
template <
size_t S,
typename T,
template <size_t,typename> class K
>
point<S,T>
closest (K<S,T>, point<S,T>);
template <
size_t S,
typename T,
template <size_t,typename> class K
>
vector<S,T>
magnitude (K<S,T>);
template <
size_t S,
typename T,
template <size_t,typename> class K
>
K<S,T>
scale (K<S,T>, T);
}