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CentOS 7.0 - man page for qpaintdevicemetrics (centos section 3qt)

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QPaintDeviceMetrics(3qt)						 QPaintDeviceMetrics(3qt)

NAME
       QPaintDeviceMetrics - Information about a paint device

SYNOPSIS
       #include <qpaintdevicemetrics.h>

   Public Members
       QPaintDeviceMetrics ( const QPaintDevice * pd )
       int width () const
       int height () const
       int widthMM () const
       int heightMM () const
       int logicalDpiX () const
       int logicalDpiY () const
       int numColors () const
       int depth () const

DESCRIPTION
       The QPaintDeviceMetrics class provides information about a paint device.

       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:

	       QPaintDeviceMetrics pdm( myWidget );
	       double aspect = (double)pdm.widthMM() / (double)pdm.heightMM();

       QPaintDeviceMetrics contains methods to provide the width and height of a device in both
       pixels (width() and height()) and millimeters (widthMM() and heightMM()), the number of
       colors the device supports (numColors()), the number of bit planes (depth()), and the
       resolution of the device (logicalDpiX() and logicalDpiY()).

       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 QPrinter that is set to "print to file": who knows what printer that file will end up
       on?

       See also Graphics Classes and Image Processing Classes.

MEMBER FUNCTION DOCUMENTATION
QPaintDeviceMetrics::QPaintDeviceMetrics ( const QPaintDevice * pd )
       Constructs a metric for the paint device pd.

int QPaintDeviceMetrics::depth () const
       Returns the bit depth (number of bit planes) of the paint device.

int QPaintDeviceMetrics::height () const
       Returns the height of the paint device in default coordinate system units (e.g. pixels for
       QPixmap and QWidget).

       Examples:

int QPaintDeviceMetrics::heightMM () const
       Returns the height of the paint device, measured in millimeters.

int QPaintDeviceMetrics::logicalDpiX () const
       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 widthMM(),
       but it varies on Windows.

       Example: qwerty/qwerty.cpp.

int QPaintDeviceMetrics::logicalDpiY () const
       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
       heightMM(), but it varies on Windows.

       Examples:

int QPaintDeviceMetrics::numColors () const
       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.

int QPaintDeviceMetrics::width () const
       Returns the width of the paint device in default coordinate system units (e.g. pixels for
       QPixmap and QWidget).

       Examples:

int QPaintDeviceMetrics::widthMM () const
       Returns the width of the paint device, measured in millimeters.

SEE ALSO
       http://doc.trolltech.com/qpaintdevicemetrics.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the license file
       included in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qpaintdevicemetrics.3qt) and the Qt version
       (3.3.8).

Trolltech AS				 2 February 2007		 QPaintDeviceMetrics(3qt)
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