cyphesis/physics/Vector3D.cpp

// Cyphesis Online RPG Server and AI Engine
// Copyright (C) 2000,2001 Alistair Riddoch
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

// $Id$

// Remember kids, it takes 7 times longer to call mag() than to call relMag(),
// so if you are comparing vector magnitudes, always use relMag().

#include "Vector3D.h"

#include <wfmath/vector.h>
#include <wfmath/point.h>

static inline float sqr(float x)
{
    return x * x;
}

float squareDistance(const Point3D & u, const Point3D & v)
{
    return (sqr(u.x() - v.x()) + sqr(u.y() - v.y()) + sqr(u.z() - v.z()));
}

void addToEntity(const Point3D & p, std::vector<double> & vd)
{
    vd.resize(3);
    vd[0] = p[0];
    vd[1] = p[1];
    vd[2] = p[2];
}

void addToEntity(const Vector3D & v, std::vector<double> & vd)
{
    vd.resize(3);
    vd[0] = v[0];
    vd[1] = v[1];
    vd[2] = v[2];
}

template <typename FloatT>
int fromStdVector(Point3D & p, const std::vector<FloatT> & vf)
{
    if (vf.size() != 3) {
        return -1;
    }
    p[0] = vf[0];
    p[1] = vf[1];
    p[2] = vf[2];
    p.setValid();
    return 0;
}

template
int fromStdVector<double>(Point3D & p, const std::vector<double> & vf);

template <typename FloatT>
int fromStdVector(Vector3D & v, const std::vector<FloatT> & vf)
{
    if (vf.size() != 3) {
        return -1;
    }
    v[0] = vf[0];
    v[1] = vf[1];
    v[2] = vf[2];
    v.setValid();
    return 0;
}

template
int fromStdVector<double>(Vector3D & v, const std::vector<double> & vf);

float sqrMag(const Point3D & p)
{
    return p.x() * p.x() + p.y() * p.y() + p.z() * p.z();
}