/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 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 GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include "qpoint.h"#include "qdatastream.h"#include "qdebug.h"/*!    \class QPoint    \ingroup multimedia    \brief The QPoint class defines a point in the plane using integer    precision.    A point is specified by a x coordinate and an y coordinate which    can be accessed using the x() and y() functions. The isNull()    function returns true if both x and y are set to 0. The    coordinates can be set (or altered) using the setX() and setY()    functions, or alternatively the rx() and ry() functions which    return references to the coordinates (allowing direct    manipulation).    Given a point \e p, the following statements are all equivalent:    \code        QPoint p;        p.setX(p.x() + 1);        p += QPoint(1, 0);        p.rx()++;    \endcode    A QPoint object can also be used as a vector: Addition and    subtraction are defined as for vectors (each component is added    separately). A QPoint object can also be divided or multiplied by    an \c int or a \c qreal.    In addition, the QPoint class provides the manhattanLength()    function which gives an inexpensive approximation of the length of    the QPoint object interpreted as a vector. Finally, QPoint objects    can be streamed as well as compared.    \sa QPointF, QPolygon*//*****************************************************************************  QPoint member functions *****************************************************************************//*!    \fn QPoint::QPoint()    Constructs a null point, i.e. with coordinates (0, 0)    \sa isNull()*//*!    \fn QPoint::QPoint(int x, int y)    Constructs a point with the given coordinates (\a x, \a  y).    \sa setX(), setY()*//*!    \fn bool QPoint::isNull() const    Returns true if both the x and y coordinates are set to 0,    otherwise returns false.*//*!    \fn int QPoint::x() const    Returns the x coordinate of this point.    \sa setX(), rx()*//*!    \fn int QPoint::y() const    Returns the y coordinate of this point.    \sa setY(), ry()*//*!    \fn void QPoint::setX(int x)    Sets the x coordinate of this point to the given \a x coordinate.    \sa x() setY()*//*!    \fn void QPoint::setY(int y)    Sets the y coordinate of this point to the given \a y coordinate.    \sa y() setX()*//*!    \fn int &QPoint::rx()    Returns a reference to the x coordinate of this point.    Using a reference makes it possible to directly manipulate x. For example:    \code        QPoint p(1, 2);        p.rx()--;   // p becomes (0, 2)    \endcode    \sa x() setX()*//*!    \fn int &QPoint::ry()    Returns a reference to the y coordinate of this point.    Using a reference makes it possible to directly manipulate y. For    example:    \code        QPoint p(1, 2);        p.ry()++;   // p becomes (1, 3)    \endcode    \sa y(), setY()*//*!    \fn QPoint &QPoint::operator+=(const QPoint &point)    Adds the given \a point to this point and returns a reference to    this point. For example:    \code        QPoint p( 3, 7);        QPoint q(-1, 4);        p += q;    // p becomes (2, 11)    \endcode    \sa operator-=()*//*!    \fn QPoint &QPoint::operator-=(const QPoint &point)    Subtracts the given \a point from this point and returns a    reference to this point. For example:    \code        QPoint p( 3, 7);        QPoint q(-1, 4);        p -= q;    // p becomes (4, 3)    \endcode    \sa operator+=()*//*!    \fn QPoint &QPoint::operator*=(qreal factor)    Multiplies this point's coordinates by the given \a factor, and    returns a reference to this point. For example:    \code        QPoint p(-1, 4);        p *= 2.5;    // p becomes (-3, 10)    \endcode    Note that the result is rounded to the nearest integer as points are held as    integers. Use QPointF for floating point accuracy.    \sa operator/=()*//*!    \fn bool operator==(const QPoint &p1, const QPoint &p2)    \relates QPoint    Returns true if \a p1 and \a p2 are equal; otherwise returns    false.*//*!    \fn bool operator!=(const QPoint &p1, const QPoint &p2)    \relates QPoint    Returns true if \a p1 and \a p2 are not equal; otherwise returns false.*//*!    \fn const QPoint operator+(const QPoint &p1, const QPoint &p2)    \relates QPoint    Returns a QPoint object that is the sum of the given points, \a p1    and \a p2; each component is added separately.    \sa QPoint::operator+=()*//*!    \fn const QPoint operator-(const QPoint &p1, const QPoint &p2)    \relates QPoint    Returns a QPoint object that is formed by subtracting \a p2 from    \a p1; each component is subtracted separately.    \sa QPoint::operator-=()*//*!    \fn const QPoint operator*(const QPoint &point, qreal factor)    \relates QPoint    Returns a copy of the given \a point multiplied by the given \a factor.    Note that the result is rounded to the nearest integer as points    are held as integers. Use QPointF for floating point accuracy.    \sa QPoint::operator*=()*//*!    \fn const QPoint operator*(qreal factor, const QPoint &point)    \overload    \relates QPoint    Returns a copy of the given \a point multiplied by the given \a factor.*//*!    \fn const QPoint operator-(const QPoint &point)    \overload    \relates QPoint    Returns a QPoint object that is formed by changing the sign of    both components of the given \a point.    Equivalent to \c{QPoint(0,0) - point}.*//*!    \fn QPoint &QPoint::operator/=(qreal divisor)    \overload    Divides both x and y by the given \a divisor, and returns a reference to this    point. For example:    \code        QPoint p(-3, 10);        p /= 2.5;           // p becomes (-1, 4)    \endcode    Note that the result is rounded to the nearest integer as points are held as    integers. Use QPointF for floating point accuracy.    \sa operator*=()*//*!    \fn const QPoint operator/(const QPoint &point, qreal divisor)    \relates QPoint    Returns the QPoint formed by dividing both components of the given \a point    by the given \a divisor.    Note that the result is rounded to the nearest integer as points are held as    integers. Use QPointF for floating point accuracy.    \sa QPoint::operator/=()*//*****************************************************************************  QPoint stream functions *****************************************************************************/#ifndef QT_NO_DATASTREAM/*!    \fn QDataStream &operator<<(QDataStream &stream, const QPoint &point)    \relates QPoint    Writes the given \a point to the given \a stream and returns a    reference to the stream.    \sa {Format of the QDataStream Operators}*/QDataStream &operator<<(QDataStream &s, const QPoint &p){    if (s.version() == 1)        s << (qint16)p.x() << (qint16)p.y();    else        s << (qint32)p.x() << (qint32)p.y();    return s;}/*!    \fn QDataStream &operator>>(QDataStream &stream, QPoint &point)    \relates QPoint    Reads a point from the given \a stream into the given \a point    and returns a reference to the stream.    \sa {Format of the QDataStream Operators}*/QDataStream &operator>>(QDataStream &s, QPoint &p){    if (s.version() == 1) {        qint16 x, y;        s >> x;  p.rx() = x;        s >> y;  p.ry() = y;    }    else {        qint32 x, y;        s >> x;  p.rx() = x;        s >> y;  p.ry() = y;    }    return s;}#endif // QT_NO_DATASTREAM/*!