libcruft-util/geom/aabb.cpp

226 lines
5.2 KiB
C++
Raw Normal View History

2015-03-07 03:16:57 +11:00
/*
2015-04-13 18:05:28 +10:00
* 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
2015-03-07 03:16:57 +11:00
*
2015-04-13 18:05:28 +10:00
* http://www.apache.org/licenses/LICENSE-2.0
2015-03-07 03:16:57 +11:00
*
2015-04-13 18:05:28 +10:00
* 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.
2015-03-07 03:16:57 +11:00
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
2016-04-05 11:06:01 +10:00
#include "./aabb.hpp"
#include "./iostream.hpp"
#include "../coord/iostream.hpp"
2016-04-05 11:06:01 +10:00
#include "../debug.hpp"
2015-03-07 03:16:57 +11:00
using util::geom::AABB;
2015-03-07 03:16:57 +11:00
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>::AABB (point<S,T> _p0, point<S,T> _p1):
p0 (_p0),
p1 (_p1)
{
debug::sanity (*this);
}
2015-04-15 17:16:34 +10:00
//-----------------------------------------------------------------------------
template <size_t S, typename T>
T
AABB<S,T>::diameter (void) const
{
return magnitude ().diameter ();
}
2015-03-07 03:16:57 +11:00
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::extent<S,T>
AABB<S,T>::magnitude (void) const
{
extent<S,T> out;
for (size_t i = 0; i < S; ++i)
out[i] = p1[i] - p0[i];
return out;
}
2015-04-07 23:10:31 +10:00
//-----------------------------------------------------------------------------
template <size_t S, typename T>
bool
AABB<S,T>::overlaps (point<S,T> p) const
{
for (size_t i = 0; i < S; ++i)
if (p0[i] > p[i] || p1[i] < p[i])
return false;
return true;
}
2015-04-08 19:00:17 +10:00
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::point<S,T>
AABB<S,T>::closest (point<S,T> q) const
{
point<S,T> res;
for (size_t i = 0; i < S; ++i)
res[i] = q[i] < p0[i] ? p0[i] :
q[i] > p1[i] ? p1[i] :
q[i];
return res;
}
2015-04-09 14:05:01 +10:00
///////////////////////////////////////////////////////////////////////////////
2015-04-08 19:00:17 +10:00
template <size_t S, typename T>
2017-08-24 16:25:57 +10:00
AABB<S,T>
AABB<S,T>::expanded (vector<S,T> mag) const noexcept
2015-04-08 19:00:17 +10:00
{
2017-08-24 16:25:57 +10:00
CHECK (all (mag >= T{0}));
CHECK (all (mag < p1 - p0));
2015-04-08 19:00:17 +10:00
2017-08-24 16:25:57 +10:00
return {
p0 - mag / T{2},
p1 + mag / T{2}
};
2015-04-09 14:05:01 +10:00
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
2017-08-24 16:25:57 +10:00
AABB<S,T>::expanded (T t) const noexcept
2015-04-09 14:05:01 +10:00
{
2017-08-24 16:25:57 +10:00
CHECK_GE (t, T{0});
CHECK (all (t < p1 - p0));
2015-04-09 14:05:01 +10:00
2017-08-24 16:25:57 +10:00
return {
p0 - t / T{2},
p1 + t / T{2}
};
2015-04-09 14:05:01 +10:00
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
2017-08-24 16:25:57 +10:00
AABB<S,T>
AABB<S,T>::contracted (util::vector<S,T> mag) const noexcept
2015-04-09 14:05:01 +10:00
{
2017-08-24 16:25:57 +10:00
CHECK (all (mag > T{0}));
CHECK (all (mag <= p1 - p0));
2015-04-09 14:05:01 +10:00
2017-08-24 16:25:57 +10:00
return {
p0 + mag / T{2},
p1 - mag / T{2}
};
2015-04-08 19:00:17 +10:00
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
2017-08-24 16:25:57 +10:00
AABB<S,T>::contracted (T mag) const noexcept
2015-04-08 19:00:17 +10:00
{
2017-08-24 16:25:57 +10:00
CHECK_GE (mag, T{0});
CHECK (all (mag <= p1 - p0));
2015-04-08 19:00:17 +10:00
2017-08-24 16:25:57 +10:00
return {
p0 + mag / T{2},
p1 - mag / T{2}
};
2015-04-08 19:00:17 +10:00
}
2017-08-24 16:25:57 +10:00
///////////////////////////////////////////////////////////////////////////////
2015-03-12 01:05:47 +11:00
template <size_t S, typename T>
void
2015-04-08 18:59:45 +10:00
AABB<S,T>::cover (point<S,T> p)
2015-03-12 01:05:47 +11:00
{
p0 = min (p, p0);
p1 = max (p, p1);
}
2015-04-13 16:44:30 +10:00
///////////////////////////////////////////////////////////////////////////////
2015-03-07 03:16:57 +11:00
template <size_t S, typename T>
AABB<S,T>
AABB<S,T>::operator+ (vector<S,T> v) const
{
return { p0 + v, p1 + v };
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
AABB<S,T>::operator- (vector<S,T> v) const
{
return { p0 - v, p1 - v };
}
2015-04-13 16:44:30 +10:00
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
bool
AABB<S,T>::operator== (const AABB<S,T> rhs) const
{
return rhs.p0 == p0 && rhs.p1 == p1;
}
2015-03-07 03:16:57 +11:00
//-----------------------------------------------------------------------------
2017-01-05 15:06:49 +11:00
namespace util::debug {
2015-03-07 03:16:57 +11:00
template <size_t S, typename T>
struct validator<AABB<S,T>> {
2015-03-07 03:16:57 +11:00
static bool is_valid (const AABB<S,T> &b)
{
for (size_t i = 0; i < S; ++i)
if (b.p1[i] < b.p0[i])
return false;
return true;
}
};
2017-01-05 15:06:49 +11:00
}
2015-03-07 03:16:57 +11:00
//-----------------------------------------------------------------------------
template <size_t S, typename T>
std::ostream&
util::geom::operator<< (std::ostream &os, util::geom::AABB<S,T> b)
2015-03-07 03:16:57 +11:00
{
os << "AABB(" << b.p0 << ", " << b.p1 << ")";
return os;
}
//-----------------------------------------------------------------------------
2017-01-05 15:06:49 +11:00
#define INSTANTIATE_S_T(S,T) \
namespace util::geom { template struct AABB<S,T>; } \
template bool util::debug::is_valid (const AABB<S,T>&); \
template std::ostream& util::geom::operator<< (std::ostream&, AABB<S,T>);
2015-03-07 03:16:57 +11:00
#define INSTANTIATE(T) \
INSTANTIATE_S_T(2,T) \
INSTANTIATE_S_T(3,T)
2016-10-25 17:47:08 +11:00
INSTANTIATE( int32_t)
INSTANTIATE( int64_t)
2015-03-07 03:16:57 +11:00
INSTANTIATE(uint32_t)
INSTANTIATE(uint64_t)
INSTANTIATE(float)
INSTANTIATE(double)