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Diffstat (limited to 'tqtinterface/qt4/src/kernel/tqpoint.cpp')
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diff --git a/tqtinterface/qt4/src/kernel/tqpoint.cpp b/tqtinterface/qt4/src/kernel/tqpoint.cpp new file mode 100644 index 0000000..cf8422e --- /dev/null +++ b/tqtinterface/qt4/src/kernel/tqpoint.cpp @@ -0,0 +1,448 @@ +/**************************************************************************** +** +** 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
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