libcruft-util/extent.cpp

177 lines
4.8 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 2010-2015 Danny Robson <danny@nerdcruft.net>
*/
#include "extent.hpp"
#include "debug.hpp"
#include "maths.hpp"
#include <cmath>
using util::extent;
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent<S,T>::extent (vector<S,T> _v)
{
std::transform (std::begin (_v),
std::end (_v),
this->begin (),
[] (auto i) {
// using std::abs gives unsigned abs warnings under clang. this tricks
// it sufficiently to quiet the warnings.
return i < 0 ? -i : i;
});
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
T
extent<S,T>::diameter (void) const
{
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; })
)
);
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
T
extent<S,T>::area (void) const
{
return std::accumulate (std::begin (this->data),
std::end (this->data),
T {1},
std::multiplies<T> ());
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent<S,T>
extent<S,T>::expanded (util::vector<S,T> mag) const
{
return *this + mag;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::expanded (T t) const
{
return *this + util::vector<S,T> {t};
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::contracted (vector<S,T> t) const
{
return *this - t;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::contracted (T t) const
{
return *this - vector<S,T> {t};
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
bool
extent<S,T>::empty (void) const
{
return almost_equal (area(), 0);
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
const extent<S,T> extent<S,T>::MIN { 0 };
//-----------------------------------------------------------------------------
template <size_t S, typename T>
const extent<S,T> extent<S,T>::MAX {
std::numeric_limits<T>::max ()
};
///////////////////////////////////////////////////////////////////////////////
namespace debug {
template <size_t S, typename T>
struct validator<extent,S,T> {
static bool is_valid (const extent<S,T> &e)
{
return std::all_of (std::begin (e.data),
std::end (e.data),
[] (auto i) { return i >= 0; });
}
};
}
template bool debug::valid (const extent<2,float>&);
template bool debug::valid (const extent<2,double>&);
template bool debug::valid (const extent<2,uint16_t>&);
template bool debug::valid (const extent<2,uint32_t>&);
template bool debug::valid (const extent<2,uint64_t>&);
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
std::ostream&
util::operator<< (std::ostream &os, extent<S,T> e)
{
os << "[";
std::copy (std::begin (e.data),
std::end (e.data),
std::ostream_iterator<T> (os, ", "));
os << "]";
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(uint16_t)
INSTANTIATE(uint32_t)
INSTANTIATE(uint64_t)
INSTANTIATE(float)
INSTANTIATE(double)
}