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Diffstat (limited to 'src/kernel/qpaintdevicemetrics.cpp')
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diff --git a/src/kernel/qpaintdevicemetrics.cpp b/src/kernel/qpaintdevicemetrics.cpp new file mode 100644 index 000000000..a154af118 --- /dev/null +++ b/src/kernel/qpaintdevicemetrics.cpp @@ -0,0 +1,151 @@ +/**************************************************************************** +** +** Implementation of TQPaintDeviceMetrics class +** +** Created : 941109 +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** 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 retquirements 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.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 "qpaintdevicemetrics.h" + +/*! + \class TQPaintDeviceMetrics qpaintdevicemetrics.h + \brief The TQPaintDeviceMetrics 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 + TQPaintDeviceMetrics pdm( myWidget ); + double aspect = (double)pdm.widthMM() / (double)pdm.heightMM(); + \endcode + + TQPaintDeviceMetrics 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 TQPaintDeviceMetrics to compute the + values you ask for, particularly for external devices. The + ultimate example is asking for the resolution of of a TQPrinter + 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. +*/ +TQPaintDeviceMetrics::TQPaintDeviceMetrics( const TQPaintDevice *pd ) +{ + pdev = (TQPaintDevice *)pd; +} + + +/*! + \fn int TQPaintDeviceMetrics::width() const + + Returns the width of the paint device in default coordinate system + units (e.g. pixels for TQPixmap and TQWidget). +*/ + +/*! + \fn int TQPaintDeviceMetrics::height() const + + Returns the height of the paint device in default coordinate + system units (e.g. pixels for TQPixmap and TQWidget). +*/ + +/*! + \fn int TQPaintDeviceMetrics::widthMM() const + + Returns the width of the paint device, measured in millimeters. +*/ + +/*! + \fn int TQPaintDeviceMetrics::heightMM() const + + Returns the height of the paint device, measured in millimeters. +*/ + +/*! + \fn int TQPaintDeviceMetrics::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 TQPaintDeviceMetrics::depth() const + + Returns the bit depth (number of bit planes) of the paint device. +*/ + +/*! + \fn int TQPaintDeviceMetrics::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 TQPaintDeviceMetrics::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 TQPaintDeviceMetrics::physicalDpiX() const + \internal +*/ +/*! + \fn int TQPaintDeviceMetrics::physicalDpiY() const + \internal +*/ + |