89 lines
2.6 KiB
C++
89 lines
2.6 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 2014-2015 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#include "maths.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
namespace util {
|
|
//-------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
template <typename U>
|
|
typename std::common_type<T,U>::type
|
|
util::point<S,T>::distance (const point<S,U> &rhs) const {
|
|
return std::sqrt (distance2 (rhs));
|
|
}
|
|
|
|
|
|
//-------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
template <typename U>
|
|
typename std::common_type<T,U>::type
|
|
util::point<S,T>::distance2 (const point<S,U> &rhs) const {
|
|
typedef typename std::common_type<T,U>::type result_t;
|
|
|
|
result_t sum { 0 };
|
|
|
|
for (size_t i = 0; i < S; ++i)
|
|
sum += pow2 (this->data[i] - rhs.data[i]);
|
|
|
|
return sum;
|
|
}
|
|
|
|
|
|
//-------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
template <typename U>
|
|
typename std::common_type<T,U>::type
|
|
util::point<S,T>::manhattan (const point<S,U> &rhs) const {
|
|
typedef typename std::common_type<T,U>::type result_t;
|
|
|
|
result_t sum { 0 };
|
|
|
|
for (size_t i = 0; i < S; ++i)
|
|
sum += std::abs (this->data[i] - rhs.data[i]);
|
|
|
|
return sum;
|
|
}
|
|
|
|
|
|
///------------------------------------------------------------------------
|
|
/// expand point to use homogenous coordinates of a higher dimension.
|
|
/// ie, fill with (0,..,0,1)
|
|
template <size_t S, typename T>
|
|
template <size_t D>
|
|
point<D,T>
|
|
point<S,T>::homog (void) const
|
|
{
|
|
static_assert (D > S, "homog will not overwrite data");
|
|
|
|
point<D,T> out;
|
|
|
|
// Copy the existing data
|
|
auto c = std::copy (this->begin (),
|
|
this->end (),
|
|
out.begin ());
|
|
|
|
// Fill until the second last element with zeros
|
|
auto f = std::fill_n (c, D - S - 1, T{0});
|
|
|
|
// Last element should be one
|
|
*f = T{1};
|
|
|
|
return out;
|
|
}
|
|
}
|