QPicture man page on Peanut

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QPicture(3qt)							 QPicture(3qt)

NAME
       QPicture - Paint device that records and replays QPainter commands

SYNOPSIS
       #include <qpicture.h>

       Inherits QPaintDevice.

   Public Members
       QPicture ( int formatVersion = -1 )
       QPicture ( const QPicture & pic )
       ~QPicture ()
       bool isNull () const
       uint size () const
       const char * data () const
       virtual void setData ( const char * data, uint size )
       bool play ( QPainter * painter )
       bool load ( QIODevice * dev, const char * format = 0 )
       bool load ( const QString & fileName, const char * format = 0 )
       bool save ( QIODevice * dev, const char * format = 0 )
       bool save ( const QString & fileName, const char * format = 0 )
       QRect boundingRect () const
       void setBoundingRect ( const QRect & r )
       QPicture & operator= ( const QPicture & p )

   Protected Members
       virtual int metric ( int m ) const
       void detach ()
       QPicture copy () const

RELATED FUNCTION DOCUMENTATION
       QDataStream & operator<< ( QDataStream & s, const QPicture & r )
       QDataStream & operator>> ( QDataStream & s, QPicture & r )

DESCRIPTION
       The QPicture class is a paint device that records and replays QPainter
       commands.

       A picture serializes painter commands to an IO device in a platform-
       independent format. For example, a picture created under Windows can be
       read on a Sun SPARC.

       Pictures are called meta-files on some platforms.

       Qt pictures use a proprietary binary format. Unlike native picture
       (meta-file) formats on many window systems, Qt pictures have no
       limitations regarding their contents. Everything that can be painted
       can also be stored in a picture, e.g. fonts, pixmaps, regions,
       transformed graphics, etc.

       QPicture is an implicitly shared class.

       Example of how to record a picture:

	   QPicture  pic;
	   QPainter  p;
	   p.begin( &pic );		  // paint in picture
	   p.drawEllipse( 10,20, 80,70 ); // draw an ellipse
	   p.end();			  // painting done
	   pic.save( "drawing.pic" );	  // save picture

       Example of how to replay a picture:

	   QPicture  pic;
	   pic.load( "drawing.pic" );	  // load picture
	   QPainter  p;
	   p.begin( &myWidget );	  // paint in myWidget
	   p.drawPicture( pic );	  // draw the picture
	   p.end();			  // painting done

       Pictures can also be drawn using play(). Some basic data about a
       picture is available, for example, size(), isNull() and boundingRect().

       See also Graphics Classes, Image Processing Classes, and Implicitly and
       Explicitly Shared Classes.

MEMBER FUNCTION DOCUMENTATION
QPicture::QPicture ( int formatVersion = -1 )
       Constructs an empty picture.

       The formatVersion parameter may be used to create a QPicture that can
       be read by applications that are compiled with earlier versions of Qt.

       formatVersion == 1 is binary compatible with Qt 1.x and later.

       formatVersion == 2 is binary compatible with Qt 2.0.x and later.

       formatVersion == 3 is binary compatible with Qt 2.1.x and later.

       formatVersion == 4 is binary compatible with Qt 3.0.x and later.

       formatVersion == 5 is binary compatible with Qt 3.1.

       Note that the default formatVersion is -1 which signifies the current
       release, i.e. for Qt 3.1 a formatVersion of 5 is the same as the
       default formatVersion of -1.

       Reading pictures generated by earlier versions of Qt is supported and
       needs no special coding; the format is automatically detected.

QPicture::QPicture ( const QPicture & pic )
       Constructs a shallow copy of pic.

QPicture::~QPicture ()
       Destroys the picture.

QRect QPicture::boundingRect () const
       Returns the picture's bounding rectangle or an invalid rectangle if the
       picture contains no data.

QPicture QPicture::copy () const [protected]
       Returns a deep copy of the picture.

const char * QPicture::data () const
       Returns a pointer to the picture data. The pointer is only valid until
       the next non-const function is called on this picture. The returned
       pointer is 0 if the picture contains no data.

       See also size() and isNull().

void QPicture::detach () [protected]
       Detaches from shared picture data and makes sure that this picture is
       the only one referring to the data.

       If multiple pictures share common data, this picture makes a copy of
       the data and detaches itself from the sharing mechanism. Nothing is
       done if there is just a single reference.

bool QPicture::isNull () const
       Returns TRUE if the picture contains no data; otherwise returns FALSE.

bool QPicture::load ( const QString & fileName, const char * format = 0 )
       Loads a picture from the file specified by fileName and returns TRUE if
       successful; otherwise returns FALSE.

       By default, the file will be interpreted as being in the native
       QPicture format. Specifying the format string is optional and is only
       needed for importing picture data stored in a different format.

       Currently, the only external format supported is the W3C SVG format
       which requires the Qt XML module. The corresponding format string is
       "svg".

       See also save().

       Examples:

bool QPicture::load ( QIODevice * dev, const char * format = 0 )
       This is an overloaded member function, provided for convenience. It
       behaves essentially like the above function.

       dev is the device to use for loading.

int QPicture::metric ( int m ) const [virtual protected]
       Internal implementation of the virtual QPaintDevice::metric() function.

       Use the QPaintDeviceMetrics class instead.

       A picture has the following hard-coded values: dpi=72,
       numcolors=16777216 and depth=24.

       m is the metric to get.

QPicture & QPicture::operator= ( const QPicture & p )
       Assigns a shallow copy of p to this picture and returns a reference to
       this picture.

bool QPicture::play ( QPainter * painter )
       Replays the picture using painter, and returns TRUE if successful;
       otherwise returns FALSE.

       This function does exactly the same as QPainter::drawPicture() with (x,
       y) = (0, 0).

bool QPicture::save ( const QString & fileName, const char * format = 0 )
       Saves a picture to the file specified by fileName and returns TRUE if
       successful; otherwise returns FALSE.

       Specifying the file format string is optional. It's not recommended
       unless you intend to export the picture data for use by a third party
       reader. By default the data will be saved in the native QPicture file
       format.

       Currently, the only external format supported is the W3C SVG format
       which requires the Qt XML module. The corresponding format string is
       "svg".

       See also load().

       Example: picture/picture.cpp.

bool QPicture::save ( QIODevice * dev, const char * format = 0 )
       This is an overloaded member function, provided for convenience. It
       behaves essentially like the above function.

       dev is the device to use for saving.

void QPicture::setBoundingRect ( const QRect & r )
       Sets the picture's bounding rectangle to r. The automatically
       calculated value is overriden.

void QPicture::setData ( const char * data, uint size ) [virtual]
       Sets the picture data directly from data and size. This function copies
       the input data.

       See also data() and size().

uint QPicture::size () const
       Returns the size of the picture data.

       See also data().

RELATED FUNCTION DOCUMENTATION
QDataStream & operator<;< ( QDataStream & s, const QPicture & r )
       Writes picture r to the stream s and returns a reference to the stream.

QDataStream & operator>> ( QDataStream & s, QPicture & r )
       Reads a picture from the stream s into picture r and returns a
       reference to the stream.

SEE ALSO
       http://doc.trolltech.com/qpicture.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
       (qpicture.3qt) and the Qt version (3.3.8).

Trolltech AS			2 February 2007			 QPicture(3qt)
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