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151 lines
7.3 KiB
151 lines
7.3 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qpaintdevicemetrics.cpp:40 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QPaintDeviceMetrics Class</title>
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<font color="#004faf">All Classes</font></a>
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<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>
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<p>The QPaintDeviceMetrics class provides information about a
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paint device.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>></tt>
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<p><a href="qpaintdevicemetrics-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QPaintDeviceMetrics"><b>QPaintDeviceMetrics</b></a> ( const QPaintDevice * pd )</li>
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<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
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<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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<li class=fn>int <a href="#widthMM"><b>widthMM</b></a> () const</li>
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<li class=fn>int <a href="#heightMM"><b>heightMM</b></a> () const</li>
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<li class=fn>int <a href="#logicalDpiX"><b>logicalDpiX</b></a> () const</li>
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<li class=fn>int <a href="#logicalDpiY"><b>logicalDpiY</b></a> () const</li>
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<li class=fn>int <a href="#numColors"><b>numColors</b></a> () const</li>
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<li class=fn>int <a href="#depth"><b>depth</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPaintDeviceMetrics class provides information about a
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paint device.
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<p>
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<p> Sometimes when drawing graphics it is necessary to obtain
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information about the physical characteristics of a paint device.
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This class provides the information. For example, to compute the
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aspect ratio of a paint device:
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<p> <pre>
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QPaintDeviceMetrics pdm( myWidget );
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double aspect = (double)pdm.<a href="#widthMM">widthMM</a>() / (double)pdm.<a href="#heightMM">heightMM</a>();
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</pre>
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<p> QPaintDeviceMetrics contains methods to provide the width and
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height of a device in both pixels (<a href="#width">width</a>() and <a href="#height">height</a>()) and
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millimeters (<a href="#widthMM">widthMM</a>() and <a href="#heightMM">heightMM</a>()), the number of colors the
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device supports (<a href="#numColors">numColors</a>()), the number of bit planes (<a href="#depth">depth</a>()),
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and the resolution of the device (<a href="#logicalDpiX">logicalDpiX</a>() and
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<a href="#logicalDpiY">logicalDpiY</a>()).
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<p> It is not always possible for QPaintDeviceMetrics to compute the
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values you ask for, particularly for external devices. The
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ultimate example is asking for the resolution of of a <a href="qprinter.html">QPrinter</a>
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that is set to "print to file": who knows what printer that file
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will end up on?
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<p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPaintDeviceMetrics"></a>QPaintDeviceMetrics::QPaintDeviceMetrics ( const <a href="qpaintdevice.html">QPaintDevice</a> * pd )
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</h3>
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Constructs a metric for the paint device <em>pd</em>.
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<h3 class=fn>int <a name="depth"></a>QPaintDeviceMetrics::depth () const
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</h3>
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<p> Returns the bit depth (number of bit planes) of the paint device.
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<h3 class=fn>int <a name="height"></a>QPaintDeviceMetrics::height () const
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</h3>
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<p> Returns the height of the paint device in default coordinate
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system units (e.g. pixels for <a href="qpixmap.html">QPixmap</a> and <a href="qwidget.html">QWidget</a>).
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<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>.
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<h3 class=fn>int <a name="heightMM"></a>QPaintDeviceMetrics::heightMM () const
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</h3>
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<p> Returns the height of the paint device, measured in millimeters.
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<h3 class=fn>int <a name="logicalDpiX"></a>QPaintDeviceMetrics::logicalDpiX () const
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</h3>
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<p> Returns the horizontal resolution of the device in dots per inch,
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which is used when computing font sizes. For X, this is usually
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the same as could be computed from <a href="#widthMM">widthMM</a>(), but it varies on
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Windows.
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<p>Example: <a href="qwerty-example.html#x379">qwerty/qwerty.cpp</a>.
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<h3 class=fn>int <a name="logicalDpiY"></a>QPaintDeviceMetrics::logicalDpiY () const
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</h3>
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<p> Returns the vertical resolution of the device in dots per inch,
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which is used when computing font sizes. For X, this is usually
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the same as could be computed from <a href="#heightMM">heightMM</a>(), but it varies on
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Windows.
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<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>.
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<h3 class=fn>int <a name="numColors"></a>QPaintDeviceMetrics::numColors () const
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</h3>
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<p> Returns the number of different colors available for the paint
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device. Since this value is an int will not be sufficient to represent
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the number of colors on 32 bit displays, in which case INT_MAX is
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returned instead.
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<h3 class=fn>int <a name="width"></a>QPaintDeviceMetrics::width () const
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</h3>
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<p> Returns the width of the paint device in default coordinate system
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units (e.g. pixels for <a href="qpixmap.html">QPixmap</a> and <a href="qwidget.html">QWidget</a>).
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<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>.
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<h3 class=fn>int <a name="widthMM"></a>QPaintDeviceMetrics::widthMM () const
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</h3>
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<p> Returns the width of the paint device, measured in millimeters.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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