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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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