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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:17:53 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:17:53 -0500
commit37e3f157c7d76f13de807fa66e36df209e1005fb (patch)
tree7a4f131b2ee065337dac341bff34515310efba4f /experimental/tqtinterface/qt4/src/kernel/tqpoint.cpp
parent16630c3eff313238fa8412275555285c9195981b (diff)
downloadtde-37e3f157c7d76f13de807fa66e36df209e1005fb.tar.gz
tde-37e3f157c7d76f13de807fa66e36df209e1005fb.zip
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+/****************************************************************************
+**
+** Implementation of TQPoint class
+**
+** Created : 931028
+**
+** Copyright (C) 2010 Timothy Pearson and (C) 1992-2008 Trolltech ASA.
+**
+** This file is part of the kernel module of the TQt 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 TQt 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.TQPL
+** included in the packaging of this file. Licensees holding valid TQt
+** Commercial licenses may use this file in accordance with the TQt
+** 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 "tqpoint.h"
+#include "tqdatastream.h"
+
+#ifdef USE_QT4
+
+#else // USE_QT4
+
+/*!
+ \class TQPoint tqpoint.h
+ \brief The TQPoint 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 TQCOORD (a 32-bit integer). The minimum
+ value of \c TQCOORD is \c TQCOORD_MIN (-2147483648) and the maximum
+ value is \c TQCOORD_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 += TQPoint( 1, 0 );
+ p.rx()++;
+ \endcode
+
+ A TQPoint can also be used as a vector. Addition and subtraction
+ of TQPoints are defined as for vectors (each component is added
+ separately). You can divide or multiply a TQPoint by an \c int or a
+ \c double. The function manhattanLength() gives an inexpensive
+ approximation of the length of the TQPoint interpreted as a vector.
+
+ Example:
+ \code
+ //TQPoint oldPos is defined somewhere else
+ MyWidget::mouseMoveEvent( TQMouseEvent *e )
+ {
+ TQPoint vector = e->pos() - oldPos;
+ if ( vector.manhattanLength() > 3 )
+ ... //mouse has moved more than 3 pixels since oldPos
+ }
+ \endcode
+
+ TQPoints can be compared for equality or inequality, and they can
+ be written to and read from a TQStream.
+
+ \sa TQPointArray TQSize, TQRect
+*/
+
+
+/*****************************************************************************
+ TQPoint member functions
+ *****************************************************************************/
+
+/*!
+ \fn TQPoint::TQPoint()
+
+ Constructs a point with coordinates (0, 0) (isNull() returns TRUE).
+*/
+
+/*!
+ \fn TQPoint::TQPoint( int xpos, int ypos )
+
+ Constructs a point with x value \a xpos and y value \a ypos.
+*/
+
+/*!
+ \fn bool TQPoint::isNull() const
+
+ Returns TRUE if both the x value and the y value are 0; otherwise
+ returns FALSE.
+*/
+
+/*!
+ \fn int TQPoint::x() const
+
+ Returns the x coordinate of the point.
+
+ \sa setX() y()
+*/
+
+/*!
+ \fn int TQPoint::y() const
+
+ Returns the y coordinate of the point.
+
+ \sa setY() x()
+*/
+
+/*!
+ \fn void TQPoint::setX( int x )
+
+ Sets the x coordinate of the point to \a x.
+
+ \sa x() setY()
+*/
+
+/*!
+ \fn void TQPoint::setY( int y )
+
+ Sets the y coordinate of the point to \a y.
+
+ \sa y() setX()
+*/
+
+
+/*!
+ \fn TQCOORD &TQPoint::rx()
+
+ Returns a reference to the x coordinate of the point.
+
+ Using a reference makes it possible to directly manipulate x.
+
+ Example:
+ \code
+ TQPoint p( 1, 2 );
+ p.rx()--; // p becomes (0, 2)
+ \endcode
+
+ \sa ry()
+*/
+
+/*!
+ \fn TQCOORD &TQPoint::ry()
+
+ Returns a reference to the y coordinate of the point.
+
+ Using a reference makes it possible to directly manipulate y.
+
+ Example:
+ \code
+ TQPoint p( 1, 2 );
+ p.ry()++; // p becomes (1, 3)
+ \endcode
+
+ \sa rx()
+*/
+
+
+/*!
+ \fn TQPoint &TQPoint::operator+=( const TQPoint &p )
+
+ Adds point \a p to this point and returns a reference to this
+ point.
+
+ Example:
+ \code
+ TQPoint p( 3, 7 );
+ TQPoint q( -1, 4 );
+ p += q; // p becomes (2,11)
+ \endcode
+*/
+
+/*!
+ \fn TQPoint &TQPoint::operator-=( const TQPoint &p )
+
+ Subtracts point \a p from this point and returns a reference to
+ this point.
+
+ Example:
+ \code
+ TQPoint p( 3, 7 );
+ TQPoint q( -1, 4 );
+ p -= q; // p becomes (4,3)
+ \endcode
+*/
+
+/*!
+ \fn TQPoint &TQPoint::operator*=( int c )
+
+ Multiplies this point's x and y by \a c, and returns a reference
+ to this point.
+
+ Example:
+ \code
+ TQPoint p( -1, 4 );
+ p *= 2; // p becomes (-2,8)
+ \endcode
+*/
+
+/*!
+ \overload TQPoint &TQPoint::operator*=( double c )
+
+ Multiplies this point's x and y by \a c, and returns a reference
+ to this point.
+
+ Example:
+ \code
+ TQPoint 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 TQPoint &p1, const TQPoint &p2 )
+
+ \relates TQPoint
+
+ Returns TRUE if \a p1 and \a p2 are equal; otherwise returns FALSE.
+*/
+
+/*!
+ \fn bool operator!=( const TQPoint &p1, const TQPoint &p2 )
+
+ \relates TQPoint
+
+ Returns TRUE if \a p1 and \a p2 are not equal; otherwise returns FALSE.
+*/
+
+/*!
+ \fn const TQPoint operator+( const TQPoint &p1, const TQPoint &p2 )
+
+ \relates TQPoint
+
+ Returns the sum of \a p1 and \a p2; each component is added separately.
+*/
+
+/*!
+ \fn const TQPoint operator-( const TQPoint &p1, const TQPoint &p2 )
+
+ \relates TQPoint
+
+ Returns \a p2 subtracted from \a p1; each component is subtracted
+ separately.
+*/
+
+/*!
+ \fn const TQPoint operator*( const TQPoint &p, int c )
+
+ \relates TQPoint
+
+ Returns the TQPoint formed by multiplying both components of \a p
+ by \a c.
+*/
+
+/*!
+ \overload const TQPoint operator*( int c, const TQPoint &p )
+
+ \relates TQPoint
+
+ Returns the TQPoint formed by multiplying both components of \a p
+ by \a c.
+*/
+
+/*!
+ \overload const TQPoint operator*( const TQPoint &p, double c )
+
+ \relates TQPoint
+
+ Returns the TQPoint 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 TQPoint operator*( double c, const TQPoint &p )
+
+ \relates TQPoint
+
+ Returns the TQPoint 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 TQPoint operator-( const TQPoint &p )
+
+ \relates TQPoint
+
+ Returns the TQPoint formed by changing the sign of both components
+ of \a p, equivalent to \c{TQPoint(0,0) - p}.
+*/
+
+/*!
+ \fn TQPoint &TQPoint::operator/=( int c )
+
+ Divides both x and y by \a c, and returns a reference to this
+ point.
+
+ Example:
+ \code
+ TQPoint p( -2, 8 );
+ p /= 2; // p becomes (-1,4)
+ \endcode
+*/
+
+/*!
+ \overload TQPoint &TQPoint::operator/=( double c )
+
+ Divides both x and y by \a c, and returns a reference to this
+ point.
+
+ Example:
+ \code
+ TQPoint 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 TQPoint operator/( const TQPoint &p, int c )
+
+ \relates TQPoint
+
+ Returns the TQPoint formed by dividing both components of \a p by
+ \a c.
+*/
+
+/*!
+ \overload const TQPoint operator/( const TQPoint &p, double c )
+
+ \relates TQPoint
+
+ Returns the TQPoint formed by dividing both components of \a p
+ by \a c.
+
+ Note that the result is truncated because points are held as
+ integers.
+*/
+
+
+void TQPoint::warningDivByZero()
+{
+#if defined(TQT_CHECK_MATH)
+ qWarning( "TQPoint: Division by zero error" );
+#endif
+}
+
+
+/*****************************************************************************
+ TQPoint stream functions
+ *****************************************************************************/
+#ifndef TQT_NO_DATASTREAM
+/*!
+ \relates TQPoint
+
+ Writes point \a p to the stream \a s and returns a reference to
+ the stream.
+
+ \sa \link datastreamformat.html Format of the TQDataStream operators \endlink
+*/
+
+TQDataStream &operator<<( TQDataStream &s, const TQPoint &p )
+{
+ if ( s.version() == 1 )
+ s << (TQ_INT16)p.x() << (TQ_INT16)p.y();
+ else
+ s << (TQ_INT32)p.x() << (TQ_INT32)p.y();
+ return s;
+}
+
+/*!
+ \relates TQPoint
+
+ Reads a TQPoint from the stream \a s into point \a p and returns a
+ reference to the stream.
+
+ \sa \link datastreamformat.html Format of the TQDataStream operators \endlink
+*/
+
+TQDataStream &operator>>( TQDataStream &s, TQPoint &p )
+{
+ if ( s.version() == 1 ) {
+ TQ_INT16 x, y;
+ s >> x; p.rx() = x;
+ s >> y; p.ry() = y;
+ }
+ else {
+ TQ_INT32 x, y;
+ s >> x; p.rx() = x;
+ s >> y; p.ry() = y;
+ }
+ return s;
+}
+#endif // TQT_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 TQPoint::manhattanLength() const
+{
+ return TQABS(x())+TQABS(y());
+}
+
+#endif // USE_QT4 \ No newline at end of file