/*

 * Copyright (C) 2010 Google Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

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 */

#ifndef Vector3_h

#define Vector3_h

#include <math.h>

namespace WebCore {

class Vector3 {

public:

    Vector3()

        : m_x(0.0)

        , m_y(0.0)

        , m_z(0.0)

    {

    }

    Vector3(double x, double y, double z)

        : m_x(x)

        , m_y(y)

        , m_z(z)

    {

    }

    Vector3(const float p[3])

        : m_x(p[0])

        , m_y(p[1])

        , m_z(p[2])

    {

    }

    Vector3(const double p[3])

        : m_x(p[0])

        , m_y(p[1])

        , m_z(p[2])

    {

    }

    double abs() const

    {

        return sqrt(m_x * m_x + m_y * m_y + m_z * m_z);

    }

    bool isZero() const

    {

        return !m_x && !m_y && !m_z;

    }

    void normalize()

    {

        double absValue = abs();

        if (!absValue)

            return;

        double k = 1.0 / absValue;

        m_x *= k;

        m_y *= k;

        m_z *= k;

    }

    double x() const { return m_x; }

    double y() const { return m_y; }

    double z() const { return m_z; }

private:

    double m_x;

    double m_y;

    double m_z;

};

inline Vector3 operator+(const Vector3& v1, const Vector3& v2)

{

    return Vector3(v1.x() + v2.x(), v1.y() + v2.y(), v1.z() + v2.z());

}

inline Vector3 operator-(const Vector3& v1, const Vector3& v2)

{

    return Vector3(v1.x() - v2.x(), v1.y() - v2.y(), v1.z() - v2.z());

}

inline Vector3 operator*(double k, const Vector3& v)

{

    return Vector3(k * v.x(), k * v.y(), k * v.z());

}

inline Vector3 operator*(const Vector3& v, double k)

{

    return Vector3(k * v.x(), k * v.y(), k * v.z());

}

inline double dot(const Vector3& v1, const Vector3& v2)

{

    return v1.x() * v2.x() + v1.y() * v2.y() + v1.z() * v2.z();

}

inline Vector3 cross(const Vector3& v1, const Vector3& v2)

{

    double x3 = v1.y() * v2.z() - v1.z() * v2.y();

    double y3 = v1.z() * v2.x() - v1.x() * v2.z();

    double z3 = v1.x() * v2.y() - v1.y() * v2.x();

    return Vector3(x3, y3, z3);

}

inline double distance(const Vector3& v1, const Vector3& v2)

{

    return (v1 - v2).abs();

}

} // WebCore

#endif // Vector3_h