libcruft-util/vector.cpp

/*
 * 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 2011 Danny Robson <danny@nerdcruft.net>
 */

#include "vector.hpp"

#include "debug/assert.hpp"
#include "std.hpp"

#include <cmath>

using cruft::vector;
using cruft::vector3f;
using cruft::vector3d;


///////////////////////////////////////////////////////////////////////////////
template <typename T>
vector<2,T>
cruft::polar_to_cartesian (vector<2,T> v)
{
    return cruft::vector<2,T> {
        v[0] * std::cos (v[1]),
        v[0] * std::sin (v[1])
    };
}


//-----------------------------------------------------------------------------
template <typename T>
vector<2,T>
cruft::cartesian_to_polar (vector<2,T> v)
{
    return cruft::vector<2,T> {
        std::hypot (v.x, v.y),
        std::atan2 (v.y, v.x)
    };
}


///////////////////////////////////////////////////////////////////////////////
template <typename T>
vector<3,T>
cruft::from_euler (vector<2,T> euler)
{
    return normalised (cruft::vector<3,T> {
         std::sin (euler.x) * std::cos (euler.y),
         std::cos (euler.x),
        -std::sin (euler.x) * std::sin (euler.y),
    });
}

template cruft::vector3f cruft::from_euler (cruft::vector2f);
template cruft::vector3d cruft::from_euler (cruft::vector2d);


//-----------------------------------------------------------------------------
template <typename T>
vector<2,T>
cruft::to_euler (vector<3,T> vec)
{
    CHECK (is_normalised (vec));

    return {
         std::acos  (vec.y),
        -std::atan2 (vec.z, vec.x),
    };
}

template cruft::vector2f cruft::to_euler (cruft::vector3f);
template cruft::vector2d cruft::to_euler (cruft::vector3d);


///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
struct cruft::debug::validator<vector<S,T>> {
    static bool
    is_valid (vector<S,T> const& val)
    {
       return std::all_of (
           std::begin (val.data),
           std::end   (val.data),
           [] (auto v) { return !std::isnan (v); }
        );
    }
};


///////////////////////////////////////////////////////////////////////////////
#define INSTANTIATE_S_T(S,T)       \
template struct cruft::vector<(S),T>; \
template struct cruft::debug::validator<vector<(S),T>>;

MAP_CRUFT_COORD_PARAMS(INSTANTIATE_S_T)

//-----------------------------------------------------------------------------
template vector<2,float> cruft::polar_to_cartesian (cruft::vector<2,float>);
template vector<2,float> cruft::cartesian_to_polar (cruft::vector<2,float>);