Vector3D.cpp

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/* Copyright (C) 2010 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Provides an interface for a vector in R3 and allows vector and
 * scalar operations on it
 */

#include "precompiled.h"

#include "Vector3D.h"

#include <math.h>
#include <float.h>
#include "MathUtil.h"
#include "FixedVector3D.h"

CVector3D::CVector3D(const CFixedVector3D& v) :
    X(v.X.ToFloat()), Y(v.Y.ToFloat()), Z(v.Z.ToFloat())
{
}

int CVector3D::operator ! () const 
{
    if (X != 0.0f ||
        Y != 0.0f ||
        Z != 0.0f)
        
        return 0;
    
    return 1;
}

float CVector3D::Dot (const CVector3D &vector) const 
{
    return ( X * vector.X +
             Y * vector.Y +
             Z * vector.Z );
}

CVector3D CVector3D::Cross (const CVector3D &vector) const 
{
    CVector3D Temp;

    Temp.X = (Y * vector.Z) - (Z * vector.Y);
    Temp.Y = (Z * vector.X) - (X * vector.Z);
    Temp.Z = (X * vector.Y) - (Y * vector.X);

    return Temp;
}


float CVector3D::LengthSquared () const 
{
    return ( SQR(X) + SQR(Y) + SQR(Z) );
}

float CVector3D::Length () const 
{
    return sqrtf ( LengthSquared() );
}

void CVector3D::Normalize ()
{
    float scale = 1.0f/Length ();

    X *= scale;
    Y *= scale;
    Z *= scale;
}

CVector3D CVector3D::Normalized () const
{
    float scale = 1.0f/Length ();

    return CVector3D(X * scale, Y * scale, Z * scale);
}


//-----------------------------------------------------------------------------

float MaxComponent(const CVector3D& v)
{
    float max = -FLT_MAX;
    for(int i = 0; i < 3; i++)
        max = std::max(max, v[i]);
    return max;
}