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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
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treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /src/qt3support/painting/q3paintdevicemetrics.cpp
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Long live Qt 4.5!
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Qt3Support module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "q3paintdevicemetrics.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class Q3PaintDeviceMetrics
+ \brief The Q3PaintDeviceMetrics class provides information about a
+ paint device.
+
+ \compat
+
+ 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:
+
+ \snippet doc/src/snippets/code/src_qt3support_painting_q3paintdevicemetrics.cpp 0
+
+ Q3PaintDeviceMetrics 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 Q3PaintDeviceMetrics 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?
+*/
+
+/*!
+ \fn Q3PaintDeviceMetrics::Q3PaintDeviceMetrics(const QPaintDevice *pd)
+
+ Constructs a metric for the paint device \a pd.
+*/
+
+
+/*!
+ \fn int Q3PaintDeviceMetrics::width() const
+
+ Returns the width of the paint device in default coordinate system
+ units (e.g. pixels for QPixmap and QWidget).
+*/
+
+/*!
+ \fn int Q3PaintDeviceMetrics::height() const
+
+ Returns the height of the paint device in default coordinate
+ system units (e.g. pixels for QPixmap and QWidget).
+*/
+
+/*!
+ \fn int Q3PaintDeviceMetrics::widthMM() const
+
+ Returns the width of the paint device, measured in millimeters.
+*/
+
+/*!
+ \fn int Q3PaintDeviceMetrics::heightMM() const
+
+ Returns the height of the paint device, measured in millimeters.
+*/
+
+/*!
+ \fn int Q3PaintDeviceMetrics::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 Q3PaintDeviceMetrics::depth() const
+
+ Returns the bit depth (number of bit planes) of the paint device.
+*/
+
+/*!
+ \fn int Q3PaintDeviceMetrics::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 Q3PaintDeviceMetrics::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 Q3PaintDeviceMetrics::physicalDpiX() const
+ \internal
+*/
+/*!
+ \fn int Q3PaintDeviceMetrics::physicalDpiY() const
+ \internal
+*/
+
+QT_END_NAMESPACE