libcruft-util/geom/aabb.cpp

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/*
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* 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
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* 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.
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*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
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#include "./aabb.hpp"
#include "./iostream.hpp"
#include "../coord/iostream.hpp"
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#include "../debug.hpp"
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using util::geom::AABB;
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//-----------------------------------------------------------------------------
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);
}
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
T
AABB<S,T>::diameter (void) const
{
return magnitude ().diameter ();
}
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//-----------------------------------------------------------------------------
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;
}
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//-----------------------------------------------------------------------------
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;
}
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//-----------------------------------------------------------------------------
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;
}
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///////////////////////////////////////////////////////////////////////////////
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template <size_t S, typename T>
AABB<S,T>&
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AABB<S,T>::expand (util::vector<S,T> mag)
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{
p0 -= mag / T{2};
p1 += mag / T{2};
return *this;
}
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>&
AABB<S,T>::expand (T t)
{
return expand (vector<S,T> {t});
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
AABB<S,T>::expanded (vector<S,T> mag)
{
auto ret = *this;
ret.expand (mag);
return ret;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
AABB<S,T>::expanded (T t)
{
return expanded (vector<S,T> {t});
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
AABB<S,T>&
AABB<S,T>::contract (util::vector<S,T> mag)
{
// Avoid contracting magnitudes larger than our extent
auto diff = p1 - p0;
auto delta = min (diff, mag);
p0 += delta / T{2};
p1 -= delta / T{2};
return *this;
}
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>&
AABB<S,T>::contract (T mag)
{
return contract (util::vector<S,T> {mag});
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
AABB<S,T>::contracted (util::vector<S,T> mag) const
{
AABB<S,T> res = *this;
res.contract (mag);
return res;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
AABB<S,T>
AABB<S,T>::contracted (T mag) const
{
return contracted (vector<S,T> {mag});
}
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
void
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AABB<S,T>::cover (point<S,T> p)
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{
p0 = min (p, p0);
p1 = max (p, p1);
}
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///////////////////////////////////////////////////////////////////////////////
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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 };
}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
bool
AABB<S,T>::operator== (const AABB<S,T> rhs) const
{
return rhs.p0 == p0 && rhs.p1 == p1;
}
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//-----------------------------------------------------------------------------
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namespace util::debug {
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template <size_t S, typename T>
struct validator<AABB<S,T>> {
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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;
}
};
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}
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
std::ostream&
util::geom::operator<< (std::ostream &os, util::geom::AABB<S,T> b)
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{
os << "AABB(" << b.p0 << ", " << b.p1 << ")";
return os;
}
//-----------------------------------------------------------------------------
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#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>);
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#define INSTANTIATE(T) \
INSTANTIATE_S_T(2,T) \
INSTANTIATE_S_T(3,T)
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INSTANTIATE( int32_t)
INSTANTIATE( int64_t)
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INSTANTIATE(uint32_t)
INSTANTIATE(uint64_t)
INSTANTIATE(float)
INSTANTIATE(double)