41 lines
830 B
C++
41 lines
830 B
C++
#pragma once
|
|
|
|
#include <limits>
|
|
#include <cmath>
|
|
|
|
#include "point.hpp"
|
|
|
|
namespace kd {
|
|
namespace math {
|
|
|
|
using byte = unsigned char;
|
|
|
|
// returns the squared distance between two points
|
|
template<class T>
|
|
T distance_sq(const Point<T>& a, const Point<T>& b)
|
|
{
|
|
auto dx = a.longitude - b.longitude;
|
|
auto dy = a.latitude - b.latitude;
|
|
return dx * dx + dy * dy;
|
|
}
|
|
|
|
// returns the distance between two points
|
|
template<class T>
|
|
T distance(const Point<T>& a, const Point<T>& b)
|
|
{
|
|
return std::sqrt(distance_sq(a, b));
|
|
}
|
|
|
|
// returns the distance between two points looking at a specific axis
|
|
// \param axis 0 if abscissa else 1 if ordinate
|
|
template <class T>
|
|
T axial_distance(const Point<T>& a, const Point<T>& b, byte axis)
|
|
{
|
|
return axis == 0 ?
|
|
a.longitude - b.longitude:
|
|
a.latitude - b.latitude;
|
|
}
|
|
|
|
}
|
|
}
|