You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
151 lines
7.3 KiB
151 lines
7.3 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/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"><!--
|
|
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 class=fn><a href="#QPaintDeviceMetrics"><b>QPaintDeviceMetrics</b></a> ( const QPaintDevice * pd )</li>
|
|
<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
|
|
<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
|
|
<li class=fn>int <a href="#widthMM"><b>widthMM</b></a> () const</li>
|
|
<li class=fn>int <a href="#heightMM"><b>heightMM</b></a> () const</li>
|
|
<li class=fn>int <a href="#logicalDpiX"><b>logicalDpiX</b></a> () const</li>
|
|
<li class=fn>int <a href="#logicalDpiY"><b>logicalDpiY</b></a> () const</li>
|
|
<li class=fn>int <a href="#numColors"><b>numColors</b></a> () const</li>
|
|
<li class=fn>int <a href="#depth"><b>depth</b></a> () const</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 the 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>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>
|
|
|
|
<p> 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#x1141">action/application.cpp</a>, <a href="simple-application-example.html#x1559">application/application.cpp</a>, <a href="helpviewer-example.html#x996">helpviewer/helpwindow.cpp</a>, <a href="mdi-example.html#x2040">mdi/application.cpp</a>, and <a href="qwerty-example.html#x378">qwerty/qwerty.cpp</a>.
|
|
<h3 class=fn>int <a name="heightMM"></a>QPaintDeviceMetrics::heightMM () const
|
|
</h3>
|
|
|
|
<p> 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>Example: <a href="qwerty-example.html#x379">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>Examples: <a href="qaction-application-example.html#x1142">action/application.cpp</a>, <a href="simple-application-example.html#x1560">application/application.cpp</a>, <a href="helpviewer-example.html#x997">helpviewer/helpwindow.cpp</a>, and <a href="mdi-example.html#x2041">mdi/application.cpp</a>.
|
|
<h3 class=fn>int <a name="numColors"></a>QPaintDeviceMetrics::numColors () 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.
|
|
|
|
<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#x1143">action/application.cpp</a>, <a href="simple-application-example.html#x1561">application/application.cpp</a>, <a href="helpviewer-example.html#x998">helpviewer/helpwindow.cpp</a>, <a href="mdi-example.html#x2042">mdi/application.cpp</a>, and <a href="qwerty-example.html#x380">qwerty/qwerty.cpp</a>.
|
|
<h3 class=fn>int <a name="widthMM"></a>QPaintDeviceMetrics::widthMM () const
|
|
</h3>
|
|
|
|
<p> 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 © 1995-2007
|
|
<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 © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|