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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qpaintdevicemetrics.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qpaintdevicemetrics.html | 150 |
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diff --git a/doc/html/qpaintdevicemetrics.html b/doc/html/qpaintdevicemetrics.html new file mode 100644 index 0000000..a85ff05 --- /dev/null +++ b/doc/html/qpaintdevicemetrics.html @@ -0,0 +1,150 @@ +<!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>. 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