Add Qt3 development HEAD version

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diff --git a/src/kernel/qpoint.cpp b/src/kernel/qpoint.cpp
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+/****************************************************************************
+**
+** Implementation of QPoint class
+**
+** Created : 931028
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the kernel module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file.  Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qpoint.h"
+#include "qdatastream.h"
+
+
+/*!
+    \class QPoint qpoint.h
+    \brief The QPoint class defines a point in the plane.
+
+    \ingroup images
+    \ingroup graphics
+    \mainclass
+
+    A point is specified by an x coordinate and a y coordinate.
+
+    The coordinate type is \c QCOORD (a 32-bit integer). The minimum
+    value of \c QCOORD is \c QCOORD_MIN (-2147483648) and the maximum
+    value is  \c QCOORD_MAX (2147483647).
+
+    The coordinates are accessed by the functions x() and y(); they
+    can be set by setX() and setY() or by the reference functions rx()
+    and ry().
+
+    Given a point \e p, the following statements are all equivalent:
+    \code
+	p.setX( p.x() + 1 );
+	p += QPoint( 1, 0 );
+	p.rx()++;
+    \endcode
+
+    A QPoint can also be used as a vector. Addition and subtraction
+    of QPoints are defined as for vectors (each component is added
+    separately). You can divide or multiply a QPoint by an \c int or a
+    \c double. The function manhattanLength() gives an inexpensive
+    approximation of the length of the QPoint interpreted as a vector.
+
+    Example:
+    \code
+	//QPoint oldPos is defined somewhere else
+	MyWidget::mouseMoveEvent( QMouseEvent *e )
+	{
+	    QPoint vector = e->pos() - oldPos;
+	    if ( vector.manhattanLength() > 3 )
+	    ... //mouse has moved more than 3 pixels since oldPos
+	}
+    \endcode
+
+    QPoints can be compared for equality or inequality, and they can
+    be written to and read from a QStream.
+
+    \sa QPointArray QSize, QRect
+*/
+
+
+/*****************************************************************************
+  QPoint member functions
+ *****************************************************************************/
+
+/*!
+    \fn QPoint::QPoint()
+
+    Constructs a point with coordinates (0, 0) (isNull() returns TRUE).
+*/
+
+/*!
+    \fn QPoint::QPoint( int xpos, int ypos )
+
+    Constructs a point with x value \a xpos and y value \a ypos.
+*/
+
+/*!
+    \fn bool QPoint::isNull() const
+
+    Returns TRUE if both the x value and the y value are 0; otherwise
+    returns FALSE.
+*/
+
+/*!
+    \fn int QPoint::x() const
+
+    Returns the x coordinate of the point.
+
+    \sa setX() y()
+*/
+
+/*!
+    \fn int QPoint::y() const
+
+    Returns the y coordinate of the point.
+
+    \sa setY() x()
+*/
+
+/*!
+    \fn void QPoint::setX( int x )
+
+    Sets the x coordinate of the point to \a x.
+
+    \sa x() setY()
+*/
+
+/*!
+    \fn void QPoint::setY( int y )
+
+    Sets the y coordinate of the point to \a y.
+
+    \sa y() setX()
+*/
+
+
+/*!
+    \fn QCOORD &QPoint::rx()
+
+    Returns a reference to the x coordinate of the point.
+
+    Using a reference makes it possible to directly manipulate x.
+
+    Example:
+    \code
+	QPoint p( 1, 2 );
+	p.rx()--;         // p becomes (0, 2)
+    \endcode
+
+    \sa ry()
+*/
+
+/*!
+    \fn QCOORD &QPoint::ry()
+
+    Returns a reference to the y coordinate of the point.
+
+    Using a reference makes it possible to directly manipulate y.
+
+    Example:
+    \code
+	QPoint p( 1, 2 );
+	p.ry()++;         // p becomes (1, 3)
+    \endcode
+
+    \sa rx()
+*/
+
+
+/*!
+    \fn QPoint &QPoint::operator+=( const QPoint &p )
+
+    Adds point \a p to this point and returns a reference to this
+    point.
+
+    Example:
+    \code
+	QPoint p(  3, 7 );
+	QPoint q( -1, 4 );
+	p += q;            // p becomes (2,11)
+    \endcode
+*/
+
+/*!
+    \fn QPoint &QPoint::operator-=( const QPoint &p )
+
+    Subtracts point \a p from this point and returns a reference to
+    this point.
+
+    Example:
+    \code
+	QPoint p(  3, 7 );
+	QPoint q( -1, 4 );
+	p -= q;            // p becomes (4,3)
+    \endcode
+*/
+
+/*!
+    \fn QPoint &QPoint::operator*=( int c )
+
+    Multiplies this point's x and y by \a c, and returns a reference
+    to this point.
+
+    Example:
+    \code
+	QPoint p( -1, 4 );
+	p *= 2;            // p becomes (-2,8)
+    \endcode
+*/
+
+/*!
+    \overload QPoint &QPoint::operator*=( double c )
+
+    Multiplies this point's x and y by \a c, and returns a reference
+    to this point.
+
+    Example:
+    \code
+	QPoint p( -1, 4 );
+	p *= 2.5;          // p becomes (-3,10)
+    \endcode
+
+    Note that the result is truncated because points are held as
+    integers.
+*/
+
+
+/*!
+    \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 the sum of \a p1 and \a p2; each component is added separately.
+*/
+
+/*!
+    \fn const QPoint operator-( const QPoint &p1, const QPoint &p2 )
+
+    \relates QPoint
+
+    Returns \a p2 subtracted from \a p1; each component is subtracted
+    separately.
+*/
+
+/*!
+    \fn const QPoint operator*( const QPoint &p, int c )
+
+    \relates QPoint
+
+    Returns the QPoint formed by multiplying both components of \a p
+    by \a c.
+*/
+
+/*!
+    \overload const QPoint operator*( int c, const QPoint &p )
+
+    \relates QPoint
+
+    Returns the QPoint formed by multiplying both components of \a p
+    by \a c.
+*/
+
+/*!
+    \overload const QPoint operator*( const QPoint &p, double c )
+
+    \relates QPoint
+
+    Returns the QPoint formed by multiplying both components of \a p
+    by \a c.
+
+    Note that the result is truncated because points are held as
+    integers.
+*/
+
+/*!
+    \overload const QPoint operator*( double c, const QPoint &p )
+
+    \relates QPoint
+
+    Returns the QPoint formed by multiplying both components of \a p
+    by \a c.
+
+    Note that the result is truncated because points are held as
+    integers.
+*/
+
+/*!
+    \overload const QPoint operator-( const QPoint &p )
+
+    \relates QPoint
+
+    Returns the QPoint formed by changing the sign of both components
+    of \a p, equivalent to \c{QPoint(0,0) - p}.
+*/
+
+/*!
+    \fn QPoint &QPoint::operator/=( int c )
+
+    Divides both x and y by \a c, and returns a reference to this
+    point.
+
+    Example:
+    \code
+	QPoint p( -2, 8 );
+	p /= 2;            // p becomes (-1,4)
+    \endcode
+*/
+
+/*!
+    \overload QPoint &QPoint::operator/=( double c )
+
+    Divides both x and y by \a c, and returns a reference to this
+    point.
+
+    Example:
+    \code
+	QPoint p( -3, 10 );
+	p /= 2.5;           // p becomes (-1,4)
+    \endcode
+
+    Note that the result is truncated because points are held as
+    integers.
+*/
+
+/*!
+    \fn const QPoint operator/( const QPoint &p, int c )
+
+    \relates QPoint
+
+    Returns the QPoint formed by dividing both components of \a p by
+    \a c.
+*/
+
+/*!
+    \overload const QPoint operator/( const QPoint &p, double c )
+
+    \relates QPoint
+
+    Returns the QPoint formed by dividing both components of \a p
+    by \a c.
+
+    Note that the result is truncated because points are held as
+    integers.
+*/
+
+
+void QPoint::warningDivByZero()
+{
+#if defined(QT_CHECK_MATH)
+    qWarning( "QPoint: Division by zero error" );
+#endif
+}
+
+
+/*****************************************************************************
+  QPoint stream functions
+ *****************************************************************************/
+#ifndef QT_NO_DATASTREAM
+/*!
+    \relates QPoint
+
+    Writes point \a p to the stream \a s and returns a reference to
+    the stream.
+
+    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator<<( QDataStream &s, const QPoint &p )
+{
+    if ( s.version() == 1 )
+	s << (Q_INT16)p.x() << (Q_INT16)p.y();
+    else
+	s << (Q_INT32)p.x() << (Q_INT32)p.y();
+    return s;
+}
+
+/*!
+    \relates QPoint
+
+    Reads a QPoint from the stream \a s into point \a p and returns a
+    reference to the stream.
+
+    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator>>( QDataStream &s, QPoint &p )
+{
+    if ( s.version() == 1 ) {
+	Q_INT16 x, y;
+	s >> x;  p.rx() = x;
+	s >> y;  p.ry() = y;
+    }
+    else {
+	Q_INT32 x, y;
+	s >> x;  p.rx() = x;
+	s >> y;  p.ry() = y;
+    }
+    return s;
+}
+#endif // QT_NO_DATASTREAM
+/*!
+    Returns the sum of the absolute values of x() and y(),
+    traditionally known as the "Manhattan length" of the vector from
+    the origin to the point. The tradition arises because such
+    distances apply to travelers who can only travel on a rectangular
+    grid, like the streets of Manhattan.
+
+    This is a useful, and quick to calculate, approximation to the
+    true length: sqrt(pow(x(),2)+pow(y(),2)).
+*/
+int QPoint::manhattanLength() const
+{
+    return QABS(x())+QABS(y());
+}