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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
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+<title>QPaintDeviceMetrics Class</title>
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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>
+
+<p>The QPaintDeviceMetrics class provides information about a
+paint device.
+<a href="#details">More...</a>
+<p><tt>#include &lt;<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>&gt;</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&nbsp;QPaintDevice&nbsp;*&nbsp;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&nbsp;<a href="qpaintdevice.html">QPaintDevice</a>&nbsp;*&nbsp;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 -->
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