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/****************************************************************************
**
** Implementation of QPaintDeviceMetrics class
**
** Created : 941109
**
** 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 [email protected].
**
** 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 "qpaintdevicemetrics.h"
/*!
\class QPaintDeviceMetrics qpaintdevicemetrics.h
\brief The QPaintDeviceMetrics class provides information about a
paint device.
\ingroup graphics
\ingroup images
Sometimes when drawing graphics it is necessary to obtain
information about the physical characteristics of a paint device.
This class provides the information. For example, to compute the
aspect ratio of a paint device:
\code
QPaintDeviceMetrics pdm( myWidget );
double aspect = (double)pdm.widthMM() / (double)pdm.heightMM();
\endcode
QPaintDeviceMetrics contains methods to provide the width and
height of a device in both pixels (width() and height()) and
millimeters (widthMM() and heightMM()), the number of colors the
device supports (numColors()), the number of bit planes (depth()),
and the resolution of the device (logicalDpiX() and
logicalDpiY()).
It is not always possible for QPaintDeviceMetrics to compute the
values you ask for, particularly for external devices. The
ultimate example is asking for the resolution of of a QPrinter
that is set to "print to file": who knows what printer that file
will end up on?
*/
/*!
Constructs a metric for the paint device \a pd.
*/
QPaintDeviceMetrics::QPaintDeviceMetrics( const QPaintDevice *pd )
{
pdev = (QPaintDevice *)pd;
}
/*!
\fn int QPaintDeviceMetrics::width() const
Returns the width of the paint device in default coordinate system
units (e.g. pixels for QPixmap and QWidget).
*/
/*!
\fn int QPaintDeviceMetrics::height() const
Returns the height of the paint device in default coordinate
system units (e.g. pixels for QPixmap and QWidget).
*/
/*!
\fn int QPaintDeviceMetrics::widthMM() const
Returns the width of the paint device, measured in millimeters.
*/
/*!
\fn int QPaintDeviceMetrics::heightMM() const
Returns the height of the paint device, measured in millimeters.
*/
/*!
\fn int QPaintDeviceMetrics::numColors() const
Returns the number of different colors available for the paint
device. Since this value is an int will not be sufficient to represent
the number of colors on 32 bit displays, in which case INT_MAX is
returned instead.
*/
/*!
\fn int QPaintDeviceMetrics::depth() const
Returns the bit depth (number of bit planes) of the paint device.
*/
/*!
\fn int QPaintDeviceMetrics::logicalDpiX() const
Returns the horizontal resolution of the device in dots per inch,
which is used when computing font sizes. For X, this is usually
the same as could be computed from widthMM(), but it varies on
Windows.
*/
/*!
\fn int QPaintDeviceMetrics::logicalDpiY() const
Returns the vertical resolution of the device in dots per inch,
which is used when computing font sizes. For X, this is usually
the same as could be computed from heightMM(), but it varies on
Windows.
*/
/*!
\fn int QPaintDeviceMetrics::physicalDpiX() const
\internal
*/
/*!
\fn int QPaintDeviceMetrics::physicalDpiY() const
\internal
*/
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