<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- q3paintdevicemetrics.cpp -->
<title>Qt 4.8: Q3PaintDeviceMetrics Class Reference</title>
<link rel="stylesheet" type="text/css" href="style/style.css" />
<script src="scripts/jquery.js" type="text/javascript"></script>
<script src="scripts/functions.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="style/superfish.css" />
<link rel="stylesheet" type="text/css" href="style/narrow.css" />
<!--[if IE]>
<meta name="MSSmartTagsPreventParsing" content="true">
<meta http-equiv="imagetoolbar" content="no">
<![endif]-->
<!--[if lt IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie6.css">
<![endif]-->
<!--[if IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie7.css">
<![endif]-->
<!--[if IE 8]>
<link rel="stylesheet" type="text/css" href="style/style_ie8.css">
<![endif]-->
<script src="scripts/superfish.js" type="text/javascript"></script>
<script src="scripts/narrow.js" type="text/javascript"></script>
</head>
<body class="" onload="CheckEmptyAndLoadList();">
<div class="header" id="qtdocheader">
<div class="content">
<div id="nav-logo">
<a href="index.html">Home</a></div>
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
<div id="narrowsearch"></div>
<div id="nav-topright">
<ul>
<li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li>
<li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li>
<li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/">
DOC</a></li>
<li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li>
</ul>
</div>
<div id="shortCut">
<ul>
<li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li>
<li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li>
</ul>
</div>
<ul class="sf-menu" id="narrowmenu">
<li><a href="#">API Lookup</a>
<ul>
<li><a href="classes.html">Class index</a></li>
<li><a href="functions.html">Function index</a></li>
<li><a href="modules.html">Modules</a></li>
<li><a href="namespaces.html">Namespaces</a></li>
<li><a href="qtglobal.html">Global Declarations</a></li>
<li><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</li>
<li><a href="#">Qt Topics</a>
<ul>
<li><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li><a href="qtquick.html">Device UIs & Qt Quick</a></li>
<li><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li><a href="supported-platforms.html">Supported Platforms</a></li>
<li><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</li>
<li><a href="#">Examples</a>
<ul>
<li><a href="all-examples.html">Examples</a></li>
<li><a href="tutorials.html">Tutorials</a></li>
<li><a href="demos.html">Demos</a></li>
<li><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="wrapper">
<div class="hd">
<span></span>
</div>
<div class="bd group">
<div class="sidebar">
<div class="searchlabel">
Search index:</div>
<div class="search" id="sidebarsearch">
<form id="qtdocsearch" action="" onsubmit="return false;">
<fieldset>
<input type="text" name="searchstring" id="pageType" value="" />
<div id="resultdialog">
<a href="#" id="resultclose">Close</a>
<p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p>
<p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span> results:</p>
<ul id="resultlist" class="all">
</ul>
</div>
</fieldset>
</form>
</div>
<div class="box first bottombar" id="lookup">
<h2 title="API Lookup"><span></span>
API Lookup</h2>
<div id="list001" class="list">
<ul id="ul001" >
<li class="defaultLink"><a href="classes.html">Class index</a></li>
<li class="defaultLink"><a href="functions.html">Function index</a></li>
<li class="defaultLink"><a href="modules.html">Modules</a></li>
<li class="defaultLink"><a href="namespaces.html">Namespaces</a></li>
<li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li>
<li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</div>
</div>
<div class="box bottombar" id="topics">
<h2 title="Qt Topics"><span></span>
Qt Topics</h2>
<div id="list002" class="list">
<ul id="ul002" >
<li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li class="defaultLink"><a href="qtquick.html">Device UIs & Qt Quick</a></li>
<li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li>
<li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</div>
</div>
<div class="box" id="examples">
<h2 title="Examples"><span></span>
Examples</h2>
<div id="list003" class="list">
<ul id="ul003">
<li class="defaultLink"><a href="all-examples.html">Examples</a></li>
<li class="defaultLink"><a href="tutorials.html">Tutorials</a></li>
<li class="defaultLink"><a href="demos.html">Demos</a></li>
<li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</div>
</div>
</div>
<div class="wrap">
<div class="toolbar">
<div class="breadcrumb toolblock">
<ul>
<li class="first"><a href="index.html">Home</a></li>
<!-- Breadcrumbs go here -->
<li><a href="modules.html">Modules</a></li>
<li>Qt3SupportLight</li>
<li>Q3PaintDeviceMetrics</li>
</ul>
</div>
<div class="toolbuttons toolblock">
<ul>
<li id="smallA" class="t_button">A</li>
<li id="medA" class="t_button active">A</li>
<li id="bigA" class="t_button">A</li>
<li id="print" class="t_button"><a href="javascript:this.print();">
<span>Print</span></a></li>
</ul>
</div>
</div>
<div class="content mainContent">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
</div>
<h1 class="title">Q3PaintDeviceMetrics Class Reference</h1>
<!-- $$$Q3PaintDeviceMetrics-brief -->
<p>The Q3PaintDeviceMetrics class provides information about a paint device. <a href="#details">More...</a></p>
<!-- @@@Q3PaintDeviceMetrics -->
<pre class="cpp"> <span class="preprocessor">#include <Q3PaintDeviceMetrics></span></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html#qpaintdevicemetrics">Porting to Qt 4</a> for more information.</p>
<ul>
<li><a href="q3paintdevicemetrics-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#Q3PaintDeviceMetrics">Q3PaintDeviceMetrics</a></b> ( const QPaintDevice * <i>pd</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#depth">depth</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#height">height</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#heightMM">heightMM</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#logicalDpiX">logicalDpiX</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#logicalDpiY">logicalDpiY</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#numColors">numColors</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#width">width</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="q3paintdevicemetrics.html#widthMM">widthMM</a></b> () const</td></tr>
</table>
<a name="details"></a>
<!-- $$$Q3PaintDeviceMetrics-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The Q3PaintDeviceMetrics class provides information about a paint device.</p>
<p>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:</p>
<pre class="cpp"> <span class="type">Q3PaintDeviceMetrics</span> pdm(myWidget);
<span class="type">double</span> aspect <span class="operator">=</span> (<span class="type">double</span>)pdm<span class="operator">.</span><a href="q3paintdevicemetrics.html#widthMM">widthMM</a>() <span class="operator">/</span> (<span class="type">double</span>)pdm<span class="operator">.</span><a href="q3paintdevicemetrics.html#heightMM">heightMM</a>();</pre>
<p>Q3PaintDeviceMetrics contains methods to provide the width and height of a device in both pixels (<a href="q3paintdevicemetrics.html#width">width</a>() and <a href="q3paintdevicemetrics.html#height">height</a>()) and millimeters (<a href="q3paintdevicemetrics.html#widthMM">widthMM</a>() and <a href="q3paintdevicemetrics.html#heightMM">heightMM</a>()), the number of colors the device supports (<a href="q3paintdevicemetrics.html#numColors">numColors</a>()), the number of bit planes (<a href="q3paintdevicemetrics.html#depth">depth</a>()), and the resolution of the device (<a href="q3paintdevicemetrics.html#logicalDpiX">logicalDpiX</a>() and <a href="q3paintdevicemetrics.html#logicalDpiY">logicalDpiY</a>()).</p>
<p>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 <a href="qprinter.html">QPrinter</a> that is set to "print to file": who knows what printer that file will end up on?</p>
</div>
<!-- @@@Q3PaintDeviceMetrics -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$Q3PaintDeviceMetrics[overload1]$$$Q3PaintDeviceMetricsconstQPaintDevice* -->
<h3 class="fn"><a name="Q3PaintDeviceMetrics"></a>Q3PaintDeviceMetrics::<span class="name">Q3PaintDeviceMetrics</span> ( const <span class="type"><a href="qpaintdevice.html">QPaintDevice</a></span> * <i>pd</i> )</h3>
<p>Constructs a metric for the paint device <i>pd</i>.</p>
<!-- @@@Q3PaintDeviceMetrics -->
<!-- $$$depth[overload1]$$$depth -->
<h3 class="fn"><a name="depth"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">depth</span> () const</h3>
<p>Returns the bit depth (number of bit planes) of the paint device.</p>
<!-- @@@depth -->
<!-- $$$height[overload1]$$$height -->
<h3 class="fn"><a name="height"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">height</span> () const</h3>
<p>Returns the height of the paint device in default coordinate system units (e.g. pixels for <a href="qpixmap.html">QPixmap</a> and <a href="qwidget.html">QWidget</a>).</p>
<!-- @@@height -->
<!-- $$$heightMM[overload1]$$$heightMM -->
<h3 class="fn"><a name="heightMM"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">heightMM</span> () const</h3>
<p>Returns the height of the paint device, measured in millimeters.</p>
<!-- @@@heightMM -->
<!-- $$$logicalDpiX[overload1]$$$logicalDpiX -->
<h3 class="fn"><a name="logicalDpiX"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">logicalDpiX</span> () const</h3>
<p>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 <a href="q3paintdevicemetrics.html#widthMM">widthMM</a>(), but it varies on Windows.</p>
<!-- @@@logicalDpiX -->
<!-- $$$logicalDpiY[overload1]$$$logicalDpiY -->
<h3 class="fn"><a name="logicalDpiY"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">logicalDpiY</span> () const</h3>
<p>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 <a href="q3paintdevicemetrics.html#heightMM">heightMM</a>(), but it varies on Windows.</p>
<!-- @@@logicalDpiY -->
<!-- $$$numColors[overload1]$$$numColors -->
<h3 class="fn"><a name="numColors"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">numColors</span> () const</h3>
<p>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.</p>
<!-- @@@numColors -->
<!-- $$$width[overload1]$$$width -->
<h3 class="fn"><a name="width"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">width</span> () const</h3>
<p>Returns the width of the paint device in default coordinate system units (e.g. pixels for <a href="qpixmap.html">QPixmap</a> and <a href="qwidget.html">QWidget</a>).</p>
<!-- @@@width -->
<!-- $$$widthMM[overload1]$$$widthMM -->
<h3 class="fn"><a name="widthMM"></a><span class="type">int</span> Q3PaintDeviceMetrics::<span class="name">widthMM</span> () const</h3>
<p>Returns the width of the paint device, measured in millimeters.</p>
<!-- @@@widthMM -->
</div>
</div>
</div>
</div>
<div class="ft">
<span></span>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.</p>
<br />
<p>
The documentation provided herein is licensed under the terms of the
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
License version 1.3</a> as published by the Free Software Foundation.</p>
<p>
Documentation sources may be obtained from <a href="http://www.qt-project.org">
www.qt-project.org</a>.</p>
<br />
<p>
Qt and respective logos are trademarks of The Qt Company Ltd
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. <a title="Privacy Policy"
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
</div>
<script src="scripts/functions.js" type="text/javascript"></script>
</body>
</html>
