libcruft-util/extent.cpp

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/*
* This file is part of libgim.
*
* libgim is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2010-2015 Danny Robson <danny@nerdcruft.net>
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*/
#include "extent.hpp"
#include "debug.hpp"
#include "maths.hpp"
#include <cmath>
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
util::extent<S,T>::extent (vector<S,T> _v)
{
std::copy (std::begin (_v.data),
std::end (_v.data),
std::begin (this->data));
}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
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T
util::extent<S,T>::diameter (void) const
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{
return static_cast<T> (
std::sqrt (
std::accumulate (std::begin (this->data),
std::end (this->data),
T {0},
[] (auto a, auto b) { return a + b * b; })
)
);
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}
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
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T
util::extent<S,T>::area (void) const
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{
return std::accumulate (std::begin (this->data),
std::end (this->data),
T {1},
std::multiplies<T> ());
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}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
util::extent<S,T>
util::extent<S,T>::expanded (util::vector<S,T> mag) const
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{
return *this + mag;
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}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::extent<S,T>
util::extent<S,T>::expanded (T t) const
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{
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return *this + util::vector<S,T> {t};
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::extent<S,T>
util::extent<S,T>::contracted (vector<S,T> t) const
{
return *this - t;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::extent<S,T>
util::extent<S,T>::contracted (T t) const
{
return *this - vector<S,T> {-t};
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}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
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bool
util::extent<S,T>::empty (void) const
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{
return almost_equal (area(), 0);
}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
const util::extent<S,T> util::extent<S,T>::MIN { 0 };
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//-----------------------------------------------------------------------------
template <size_t S, typename T>
const util::extent<S,T> util::extent<S,T>::MAX {
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std::numeric_limits<T>::max ()
};
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///////////////////////////////////////////////////////////////////////////////
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namespace debug {
template <size_t S, typename T>
struct validator<util::extent,S,T> {
static bool is_valid (const util::extent<S,T> &e)
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{
return std::all_of (std::begin (e.data),
std::end (e.data),
[] (auto i) { return i >= 0; });
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}
};
}
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template bool debug::valid (const util::extent<2,float>&);
template bool debug::valid (const util::extent<2,double>&);
template bool debug::valid (const util::extent<2,uint16_t>&);
template bool debug::valid (const util::extent<2,uint32_t>&);
template bool debug::valid (const util::extent<2,uint64_t>&);
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
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std::ostream&
util::operator<< (std::ostream &os, util::extent<S,T> e)
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{
os << "[";
std::copy (std::begin (e.data),
std::end (e.data),
std::ostream_iterator<T> (os, ", "));
os << "]";
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return os;
}
//-----------------------------------------------------------------------------
namespace util {
#define INSTANTIATE_S_T(S,T) \
template struct extent<S,T>; \
template std::ostream& operator<< (std::ostream&, extent<S,T>);
#define INSTANTIATE(T) \
INSTANTIATE_S_T(2,T) \
INSTANTIATE_S_T(3,T)
INSTANTIATE(uint32_t)
INSTANTIATE(uint64_t)
INSTANTIATE(float)
INSTANTIATE(double)
}