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/****************************************************************************
**
** 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 "qdoublevector2d_p.h"
#include "qdoublevector3d_p.h"
#include <QtCore/qdatastream.h>
#include <QtCore/qdebug.h>
#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE
QDoubleVector2D::QDoubleVector2D(const QDoubleVector3D &vector)
{
xp = vector.xp;
yp = vector.yp;
}
double QDoubleVector2D::length() const
{
return qSqrt(xp * xp + yp * yp);
}
double QDoubleVector2D::lengthSquared() const
{
return xp * xp + yp * yp;
}
QDoubleVector2D QDoubleVector2D::normalized() const
{
// Need some extra precision if the length is very small.
double len = double(xp) * double(xp) +
double(yp) * double(yp);
if (qFuzzyIsNull(len - 1.0))
return *this;
else if (!qFuzzyIsNull(len))
return *this / (double)qSqrt(len);
else
return QDoubleVector2D();
}
void QDoubleVector2D::normalize()
{
// Need some extra precision if the length is very small.
double len = double(xp) * double(xp) +
double(yp) * double(yp);
if (qFuzzyIsNull(len - 1.0) || qFuzzyIsNull(len))
return;
len = qSqrt(len);
xp /= len;
yp /= len;
}
double QDoubleVector2D::dotProduct(const QDoubleVector2D &v1, const QDoubleVector2D &v2)
{
return v1.xp * v2.xp + v1.yp * v2.yp;
}
QDoubleVector3D QDoubleVector2D::toVector3D() const
{
return QDoubleVector3D(xp, yp, 0.0);
}
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QDoubleVector2D &vector)
{
dbg.nospace() << "QDoubleVector2D(" << vector.x() << ", " << vector.y() << ')';
return dbg.space();
}
#endif
#ifndef QT_NO_DATASTREAM
QDataStream &operator<<(QDataStream &stream, const QDoubleVector2D &vector)
{
stream << double(vector.x()) << double(vector.y());
return stream;
}
QDataStream &operator>>(QDataStream &stream, QDoubleVector2D &vector)
{
double x, y;
stream >> x;
stream >> y;
vector.setX(double(x));
vector.setY(double(y));
return stream;
}
#endif // QT_NO_DATASTREAM
QT_END_NAMESPACE
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