<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /tmp/qt-3.0-reggie-28534/qt-x11-free-3.0.2/src/kernel/qpaintdevicemetrics.cpp:40 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>QPaintDeviceMetrics Class</title>
<style type="text/css"><!--
h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
<a href="index.html">
<font color="#004faf">Home</font></a>
| <a href="classes.html">
<font color="#004faf">All Classes</font></a>
| <a href="mainclasses.html">
<font color="#004faf">Main Classes</font></a>
| <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
| <a href="groups.html">
<font color="#004faf">Grouped Classes</font></a>
| <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPaintDeviceMetrics Class Reference</h1>
<p>The QPaintDeviceMetrics class provides information about a
paint device.
<a href="#details">More...</a>
<p><tt>#include <<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>></tt>
<p><a href="qpaintdevicemetrics-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class=fn><a href="#QPaintDeviceMetrics"><b>QPaintDeviceMetrics</b></a> ( const QPaintDevice * pd )</div></li>
<li><div class=fn>int <a href="#width"><b>width</b></a> () const</div></li>
<li><div class=fn>int <a href="#height"><b>height</b></a> () const</div></li>
<li><div class=fn>int <a href="#widthMM"><b>widthMM</b></a> () const</div></li>
<li><div class=fn>int <a href="#heightMM"><b>heightMM</b></a> () const</div></li>
<li><div class=fn>int <a href="#logicalDpiX"><b>logicalDpiX</b></a> () const</div></li>
<li><div class=fn>int <a href="#logicalDpiY"><b>logicalDpiY</b></a> () const</div></li>
<li><div class=fn>int <a href="#numColors"><b>numColors</b></a> () const</div></li>
<li><div class=fn>int <a href="#depth"><b>depth</b></a> () const</div></li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QPaintDeviceMetrics 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 this information. For example, to compute the
aspect ratio of a paint device:
<p> <pre>
QPaintDeviceMetrics pdm( myWidget );
double aspect = (double)pdm.<a href="#widthMM">widthMM</a>() / (double)pdm.<a href="#heightMM">heightMM</a>();
</pre>
<p> QPaintDeviceMetrics contains methods to provide the width and height
of a device in both pixels (<a href="#width">width</a>() and <a href="#height">height</a>()) and millimeters
(<a href="#widthMM">widthMM</a>() and <a href="#heightMM">heightMM</a>()), the number of colors the device supports
(<a href="#numColors">numColors</a>()), the number of bit planes (<a href="#depth">depth</a>()), and the
resolution of the device (<a href="#logicalDpiX">logicalDpiX</a>() and <a href="#logicalDpiY">logicalDpiY</a>()).
<p> 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 <a href="qprinter.html">QPrinter</a> that is set to
"print to file": who knows what printer that file will end up on?
<p> <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QPaintDeviceMetrics"></a>QPaintDeviceMetrics::QPaintDeviceMetrics ( const <a href="qpaintdevice.html">QPaintDevice</a> * pd )
</h3>
Constructs a metric for the paint device <em>pd</em>.
<h3 class=fn>int <a name="depth"></a>QPaintDeviceMetrics::depth () const
</h3>
Returns the bit depth (number of bit planes) of the paint device.
<h3 class=fn>int <a name="height"></a>QPaintDeviceMetrics::height () 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>Examples: <a href="qaction-application-example.html#x2029">action/application.cpp</a>, <a href="simple-application-example.html#x1927">application/application.cpp</a>, <a href="helpviewer-example.html#x1402">helpviewer/helpwindow.cpp</a>, <a href="mdi-example.html#x1159">mdi/application.cpp</a> and <a href="qwerty-example.html#x640">qwerty/qwerty.cpp</a>.
<h3 class=fn>int <a name="heightMM"></a>QPaintDeviceMetrics::heightMM () const
</h3>
Returns the height of the paint device, measured in millimeters.
<h3 class=fn>int <a name="logicalDpiX"></a>QPaintDeviceMetrics::logicalDpiX () 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="#widthMM">widthMM</a>(), but it varies on Windows.
<p>Examples: <a href="helpviewer-example.html#x1403">helpviewer/helpwindow.cpp</a> and <a href="qwerty-example.html#x641">qwerty/qwerty.cpp</a>.
<h3 class=fn>int <a name="logicalDpiY"></a>QPaintDeviceMetrics::logicalDpiY () 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="#heightMM">heightMM</a>(), but it varies on Windows.
<p>Example: <a href="helpviewer-example.html#x1404">helpviewer/helpwindow.cpp</a>.
<h3 class=fn>int <a name="numColors"></a>QPaintDeviceMetrics::numColors () const
</h3>
Returns the number of different colors available for the paint device.
<h3 class=fn>int <a name="width"></a>QPaintDeviceMetrics::width () 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>Examples: <a href="qaction-application-example.html#x2030">action/application.cpp</a>, <a href="simple-application-example.html#x1928">application/application.cpp</a>, <a href="helpviewer-example.html#x1405">helpviewer/helpwindow.cpp</a>, <a href="mdi-example.html#x1160">mdi/application.cpp</a> and <a href="qwerty-example.html#x642">qwerty/qwerty.cpp</a>.
<h3 class=fn>int <a name="widthMM"></a>QPaintDeviceMetrics::widthMM () const
</h3>
Returns the width of the paint device, measured in millimeters.
<!-- eof -->
<hr><p>
This file is part of the <a href="index.html">Qt toolkit</a>.
Copyright © 1995-2001
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright © 2001
<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.2</div>
</table></div></address></body>
</html>
distrib
>
Mandriva
>
8.2
>
i586
>
media
>
contrib
>
by-pkgid
>
112b0974ad288f6cd55bf971ee6026a9
>
files
>
1601
