Danny Robson
f6056153e3
This places, at long last, the core library code into the same namespace as the extended library code.
51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
/*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*
|
|
* Copyright 2018 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "../point.hpp"
|
|
|
|
|
|
namespace cruft::geom {
|
|
template <size_t S, typename T>
|
|
struct segment {
|
|
cruft::point<S,T> a;
|
|
cruft::point<S,T> b;
|
|
};
|
|
|
|
|
|
using segment2f = segment<2,float>;
|
|
using segment3f = segment<3,float>;
|
|
|
|
|
|
template <size_t S, typename T>
|
|
T
|
|
distance2 (segment<S,T> s, point<S,T> p)
|
|
{
|
|
const auto dir = s.b - s.a;
|
|
const auto t1 = dot (p - s.a, dir);
|
|
if (t1 < 0)
|
|
return distance2 (p, s.a);
|
|
|
|
const auto t2 = dot (dir, dir);
|
|
if (t2 < t1)
|
|
return distance2 (p, s.b);
|
|
|
|
auto t = t1 / t2;
|
|
return distance2 (p, s.a + t * dir);
|
|
}
|
|
|
|
|
|
template <size_t S, typename T>
|
|
T
|
|
distance (segment<S,T> s, point<S,T> p)
|
|
{
|
|
return std::sqrt (distance2 (s, p));
|
|
}
|
|
};
|