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433 lines
10 KiB
433 lines
10 KiB
/****************************************************************************
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**
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** Implementation of QSize class
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**
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** Created : 931028
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the kernel module of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#include "qsize.h"
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#include "qdatastream.h"
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/*!
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\class QSize
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\brief The QSize class defines the size of a two-dimensional object.
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\ingroup images
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\ingroup graphics
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A size is specified by a width and a height.
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The coordinate type is QCOORD (defined in \c <qwindowdefs.h> as \c int).
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The minimum value of QCOORD is QCOORD_MIN (-2147483648) and the maximum
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value is QCOORD_MAX (2147483647).
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The size can be set in the constructor and changed with setWidth()
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and setHeight(), or using operator+=(), operator-=(), operator*=()
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and operator/=(), etc. You can swap the width and height with
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transpose(). You can get a size which holds the maximum height and
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width of two sizes using expandedTo(), and the minimum height and
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width of two sizes using boundedTo().
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\sa QPoint, QRect
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*/
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/*****************************************************************************
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QSize member functions
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*****************************************************************************/
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/*!
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\fn QSize::QSize()
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Constructs a size with invalid (negative) width and height.
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*/
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/*!
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\fn QSize::QSize( int w, int h )
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Constructs a size with width \a w and height \a h.
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*/
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/*!
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\fn bool QSize::isNull() const
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Returns TRUE if the width is 0 and the height is 0; otherwise
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returns FALSE.
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*/
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/*!
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\fn bool QSize::isEmpty() const
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Returns TRUE if the width is less than or equal to 0, or the height is
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less than or equal to 0; otherwise returns FALSE.
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*/
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/*!
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\fn bool QSize::isValid() const
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Returns TRUE if the width is equal to or greater than 0 and the height is
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equal to or greater than 0; otherwise returns FALSE.
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*/
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/*!
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\fn int QSize::width() const
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Returns the width.
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\sa height()
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*/
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/*!
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\fn int QSize::height() const
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Returns the height.
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\sa width()
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*/
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/*!
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\fn void QSize::setWidth( int w )
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Sets the width to \a w.
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\sa width(), setHeight()
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*/
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/*!
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\fn void QSize::setHeight( int h )
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Sets the height to \a h.
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\sa height(), setWidth()
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*/
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/*!
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Swaps the values of width and height.
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*/
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void QSize::transpose()
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{
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QCOORD tmp = wd;
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wd = ht;
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ht = tmp;
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}
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/*! \enum QSize::ScaleMode
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This enum type defines the different ways of scaling a size.
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\img scaling.png
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\value ScaleFree The size is scaled freely. The ratio is not preserved.
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\value ScaleMin The size is scaled to a rectangle as large as possible
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inside a given rectangle, preserving the aspect ratio.
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\value ScaleMax The size is scaled to a rectangle as small as possible
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outside a given rectangle, preserving the aspect ratio.
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\sa QSize::scale(), QImage::scale(), QImage::smoothScale()
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*/
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/*!
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Scales the size to a rectangle of width \a w and height \a h according
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to the ScaleMode \a mode.
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\list
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\i If \a mode is \c ScaleFree, the size is set to (\a w, \a h).
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\i If \a mode is \c ScaleMin, the current size is scaled to a rectangle
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as large as possible inside (\a w, \a h), preserving the aspect ratio.
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\i If \a mode is \c ScaleMax, the current size is scaled to a rectangle
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as small as possible outside (\a w, \a h), preserving the aspect ratio.
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\endlist
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Example:
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\code
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QSize t1( 10, 12 );
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t1.scale( 60, 60, QSize::ScaleFree );
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// t1 is (60, 60)
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QSize t2( 10, 12 );
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t2.scale( 60, 60, QSize::ScaleMin );
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// t2 is (50, 60)
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QSize t3( 10, 12 );
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t3.scale( 60, 60, QSize::ScaleMax );
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// t3 is (60, 72)
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\endcode
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*/
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void QSize::scale( int w, int h, ScaleMode mode )
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{
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if ( mode == ScaleFree ) {
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wd = (QCOORD)w;
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ht = (QCOORD)h;
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} else {
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bool useHeight = TRUE;
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int w0 = width();
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int h0 = height();
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int rw = h * w0 / h0;
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if ( mode == ScaleMin ) {
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useHeight = ( rw <= w );
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} else { // mode == ScaleMax
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useHeight = ( rw >= w );
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}
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if ( useHeight ) {
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wd = (QCOORD)rw;
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ht = (QCOORD)h;
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} else {
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wd = (QCOORD)w;
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ht = (QCOORD)( w * h0 / w0 );
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}
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}
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}
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/*!
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\overload
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Equivalent to scale(\a{s}.width(), \a{s}.height(), \a mode).
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*/
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void QSize::scale( const QSize &s, ScaleMode mode )
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{
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scale( s.width(), s.height(), mode );
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}
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/*!
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\fn QCOORD &QSize::rwidth()
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Returns a reference to the width.
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Using a reference makes it possible to directly manipulate the width.
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Example:
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\code
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QSize s( 100, 10 );
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s.rwidth() += 20; // s becomes (120,10)
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\endcode
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\sa rheight()
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*/
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/*!
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\fn QCOORD &QSize::rheight()
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Returns a reference to the height.
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Using a reference makes it possible to directly manipulate the height.
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Example:
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\code
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QSize s( 100, 10 );
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s.rheight() += 5; // s becomes (100,15)
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\endcode
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\sa rwidth()
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*/
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/*!
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\fn QSize &QSize::operator+=( const QSize &s )
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Adds \a s to the size and returns a reference to this size.
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Example:
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\code
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QSize s( 3, 7 );
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QSize r( -1, 4 );
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s += r; // s becomes (2,11)
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\endcode
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*/
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/*!
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\fn QSize &QSize::operator-=( const QSize &s )
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Subtracts \a s from the size and returns a reference to this size.
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Example:
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\code
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QSize s( 3, 7 );
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QSize r( -1, 4 );
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s -= r; // s becomes (4,3)
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\endcode
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*/
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/*!
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\fn QSize &QSize::operator*=( int c )
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Multiplies both the width and height by \a c and returns a reference to
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the size.
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*/
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/*!
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\overload QSize &QSize::operator*=( double c )
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Multiplies both the width and height by \a c and returns a reference to
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the size.
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Note that the result is truncated.
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*/
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/*!
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\fn bool operator==( const QSize &s1, const QSize &s2 )
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\relates QSize
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Returns TRUE if \a s1 and \a s2 are equal; otherwise returns FALSE.
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*/
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/*!
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\fn bool operator!=( const QSize &s1, const QSize &s2 )
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\relates QSize
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Returns TRUE if \a s1 and \a s2 are different; otherwise returns FALSE.
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*/
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/*!
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\fn const QSize operator+( const QSize &s1, const QSize &s2 )
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\relates QSize
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Returns the sum of \a s1 and \a s2; each component is added separately.
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*/
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/*!
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\fn const QSize operator-( const QSize &s1, const QSize &s2 )
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\relates QSize
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Returns \a s2 subtracted from \a s1; each component is
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subtracted separately.
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*/
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/*!
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\fn const QSize operator*( const QSize &s, int c )
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\relates QSize
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Multiplies \a s by \a c and returns the result.
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*/
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/*!
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\overload const QSize operator*( int c, const QSize &s )
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\relates QSize
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Multiplies \a s by \a c and returns the result.
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*/
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/*!
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\overload const QSize operator*( const QSize &s, double c )
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\relates QSize
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Multiplies \a s by \a c and returns the result.
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*/
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/*!
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\overload const QSize operator*( double c, const QSize &s )
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\relates QSize
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Multiplies \a s by \a c and returns the result.
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*/
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/*!
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\fn QSize &QSize::operator/=( int c )
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Divides both the width and height by \a c and returns a reference to the
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size.
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*/
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/*!
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\fn QSize &QSize::operator/=( double c )
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\overload
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Divides both the width and height by \a c and returns a reference to the
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size.
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Note that the result is truncated.
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*/
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/*!
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\fn const QSize operator/( const QSize &s, int c )
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\relates QSize
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Divides \a s by \a c and returns the result.
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*/
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/*!
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\fn const QSize operator/( const QSize &s, double c )
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\relates QSize
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\overload
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Divides \a s by \a c and returns the result.
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Note that the result is truncated.
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*/
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/*!
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\fn QSize QSize::expandedTo( const QSize & otherSize ) const
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Returns a size with the maximum width and height of this size and
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\a otherSize.
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*/
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/*!
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\fn QSize QSize::boundedTo( const QSize & otherSize ) const
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Returns a size with the minimum width and height of this size and
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\a otherSize.
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*/
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void QSize::warningDivByZero()
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{
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#if defined(QT_CHECK_MATH)
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qWarning( "QSize: Division by zero error" );
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#endif
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}
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/*****************************************************************************
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QSize stream functions
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*****************************************************************************/
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#ifndef QT_NO_DATASTREAM
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/*!
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\relates QSize
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Writes the size \a sz to the stream \a s and returns a reference to
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the stream.
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\sa \link datastreamformat.html Format of the QDataStream operators \endlink
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*/
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QDataStream &operator<<( QDataStream &s, const QSize &sz )
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{
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if ( s.version() == 1 )
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s << (Q_INT16)sz.width() << (Q_INT16)sz.height();
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else
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s << (Q_INT32)sz.width() << (Q_INT32)sz.height();
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return s;
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}
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/*!
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\relates QSize
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Reads the size from the stream \a s into size \a sz and returns a
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reference to the stream.
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\sa \link datastreamformat.html Format of the QDataStream operators \endlink
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*/
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QDataStream &operator>>( QDataStream &s, QSize &sz )
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{
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if ( s.version() == 1 ) {
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Q_INT16 w, h;
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s >> w; sz.rwidth() = w;
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s >> h; sz.rheight() = h;
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}
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else {
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Q_INT32 w, h;
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s >> w; sz.rwidth() = w;
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s >> h; sz.rheight() = h;
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}
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return s;
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}
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#endif // QT_NO_DATASTREAM
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