/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdoublevector3d_p.h"
#include "qdoublevector2d_p.h"
#include <QtCore/qdatastream.h>
#include <QtCore/qmath.h>
#include <QtCore/qdebug.h>

QT_BEGIN_NAMESPACE

QDoubleVector3D::QDoubleVector3D(const QDoubleVector2D &vector)
{
    xp = vector.xp;
    yp = vector.yp;
    zp = 0.0;
}

QDoubleVector3D::QDoubleVector3D(const QDoubleVector2D &vector, double zpos)
{
    xp = vector.xp;
    yp = vector.yp;
    zp = zpos;
}

QDoubleVector3D QDoubleVector3D::normalized() const
{
    // Need some extra precision if the length is very small.
    double len = double(xp) * double(xp) +
                 double(yp) * double(yp) +
                 double(zp) * double(zp);
    if (qFuzzyIsNull(len - 1.0))
        return *this;
    else if (!qFuzzyIsNull(len))
        return *this / (double)qSqrt(len);
    else
        return QDoubleVector3D();
}

void QDoubleVector3D::normalize()
{
    // Need some extra precision if the length is very small.
    double len = double(xp) * double(xp) +
                 double(yp) * double(yp) +
                 double(zp) * double(zp);
    if (qFuzzyIsNull(len - 1.0) || qFuzzyIsNull(len))
        return;

    len = qSqrt(len);

    xp /= len;
    yp /= len;
    zp /= len;
}

double QDoubleVector3D::dotProduct(const QDoubleVector3D &v1, const QDoubleVector3D &v2)
{
    return v1.xp * v2.xp + v1.yp * v2.yp + v1.zp * v2.zp;
}

QDoubleVector3D QDoubleVector3D::crossProduct(const QDoubleVector3D &v1, const QDoubleVector3D &v2)
{
    return QDoubleVector3D(v1.yp * v2.zp - v1.zp * v2.yp,
                    v1.zp * v2.xp - v1.xp * v2.zp,
                    v1.xp * v2.yp - v1.yp * v2.xp);
}

QDoubleVector3D QDoubleVector3D::normal(const QDoubleVector3D &v1, const QDoubleVector3D &v2)
{
    return crossProduct(v1, v2).normalized();
}

QDoubleVector3D QDoubleVector3D::normal
        (const QDoubleVector3D &v1, const QDoubleVector3D &v2, const QDoubleVector3D &v3)
{
    return crossProduct((v2 - v1), (v3 - v1)).normalized();
}

double QDoubleVector3D::distanceToPlane
        (const QDoubleVector3D &plane, const QDoubleVector3D &normal) const
{
    return dotProduct(*this - plane, normal);
}

double QDoubleVector3D::distanceToPlane
    (const QDoubleVector3D &plane1, const QDoubleVector3D &plane2, const QDoubleVector3D &plane3) const
{
    QDoubleVector3D n = normal(plane2 - plane1, plane3 - plane1);
    return dotProduct(*this - plane1, n);
}

double QDoubleVector3D::distanceToLine
        (const QDoubleVector3D &point, const QDoubleVector3D &direction) const
{
    if (direction.isNull())
        return (*this - point).length();
    QDoubleVector3D p = point + dotProduct(*this - point, direction) * direction;
    return (*this - p).length();
}

QDoubleVector2D QDoubleVector3D::toVector2D() const
{
    return QDoubleVector2D(xp, yp);
}

double QDoubleVector3D::length() const
{
    return qSqrt(xp * xp + yp * yp + zp * zp);
}

double QDoubleVector3D::lengthSquared() const
{
    return xp * xp + yp * yp + zp * zp;
}

#ifndef QT_NO_DEBUG_STREAM

QDebug operator<<(QDebug dbg, const QDoubleVector3D &vector)
{
    dbg.nospace() << "QDoubleVector3D("
        << vector.x() << ", " << vector.y() << ", " << vector.z() << ')';
    return dbg.space();
}

#endif

#ifndef QT_NO_DATASTREAM

QDataStream &operator<<(QDataStream &stream, const QDoubleVector3D &vector)
{
    stream << double(vector.x()) << double(vector.y())
           << double(vector.z());
    return stream;
}

QDataStream &operator>>(QDataStream &stream, QDoubleVector3D &vector)
{
    double x, y, z;
    stream >> x;
    stream >> y;
    stream >> z;
    vector.setX(double(x));
    vector.setY(double(y));
    vector.setZ(double(z));
    return stream;
}

#endif // QT_NO_DATASTREAM

QT_END_NAMESPACE