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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2013-11-06 16:23:17 -0600
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2013-11-06 16:23:17 -0600
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+'\" t
+.TH QPicture 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
+.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
+.\" license file included in the distribution for a complete license
+.\" statement.
+.\"
+.ad l
+.nh
+.SH NAME
+QPicture \- Paint device that records and replays QPainter commands
+.SH SYNOPSIS
+\fC#include <ntqpicture.h>\fR
+.PP
+Inherits QPaintDevice.
+.PP
+.SS "Public Members"
+.in +1c
+.ti -1c
+.BI "\fBQPicture\fR ( int formatVersion = -1 )"
+.br
+.ti -1c
+.BI "\fBQPicture\fR ( const QPicture & pic )"
+.br
+.ti -1c
+.BI "\fB~QPicture\fR ()"
+.br
+.ti -1c
+.BI "bool \fBisNull\fR () const"
+.br
+.ti -1c
+.BI "uint \fBsize\fR () const"
+.br
+.ti -1c
+.BI "const char * \fBdata\fR () const"
+.br
+.ti -1c
+.BI "virtual void \fBsetData\fR ( const char * data, uint size )"
+.br
+.ti -1c
+.BI "bool \fBplay\fR ( QPainter * painter )"
+.br
+.ti -1c
+.BI "bool \fBload\fR ( QIODevice * dev, const char * format = 0 )"
+.br
+.ti -1c
+.BI "bool \fBload\fR ( const QString & fileName, const char * format = 0 )"
+.br
+.ti -1c
+.BI "bool \fBsave\fR ( QIODevice * dev, const char * format = 0 )"
+.br
+.ti -1c
+.BI "bool \fBsave\fR ( const QString & fileName, const char * format = 0 )"
+.br
+.ti -1c
+.BI "QRect \fBboundingRect\fR () const"
+.br
+.ti -1c
+.BI "void \fBsetBoundingRect\fR ( const QRect & r )"
+.br
+.ti -1c
+.BI "QPicture & \fBoperator=\fR ( const QPicture & p )"
+.br
+.in -1c
+.SS "Protected Members"
+.in +1c
+.ti -1c
+.BI "virtual int \fBmetric\fR ( int m ) const"
+.br
+.ti -1c
+.BI "void \fBdetach\fR ()"
+.br
+.ti -1c
+.BI "QPicture \fBcopy\fR () const"
+.br
+.in -1c
+.SH RELATED FUNCTION DOCUMENTATION
+.in +1c
+.ti -1c
+.BI "QDataStream & \fBoperator<<\fR ( QDataStream & s, const QPicture & r )"
+.br
+.ti -1c
+.BI "QDataStream & \fBoperator>>\fR ( QDataStream & s, QPicture & r )"
+.br
+.in -1c
+.SH DESCRIPTION
+The QPicture class is a paint device that records and replays QPainter commands.
+.PP
+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.
+.PP
+Pictures are called meta-files on some platforms.
+.PP
+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.
+.PP
+QPicture is an implicitly shared class.
+.PP
+Example of how to record a picture:
+.PP
+.nf
+.br
+ QPicture pic;
+.br
+ QPainter p;
+.br
+ p.begin( &pic ); // paint in picture
+.br
+ p.drawEllipse( 10,20, 80,70 ); // draw an ellipse
+.br
+ p.end(); // painting done
+.br
+ pic.save( "drawing.pic" ); // save picture
+.br
+.fi
+.PP
+Example of how to replay a picture:
+.PP
+.nf
+.br
+ QPicture pic;
+.br
+ pic.load( "drawing.pic" ); // load picture
+.br
+ QPainter p;
+.br
+ p.begin( &myWidget ); // paint in myWidget
+.br
+ p.drawPicture( pic ); // draw the picture
+.br
+ p.end(); // painting done
+.br
+.fi
+.PP
+Pictures can also be drawn using play(). Some basic data about a picture is available, for example, size(), isNull() and boundingRect().
+.PP
+See also Graphics Classes, Image Processing Classes, and Implicitly and Explicitly Shared Classes.
+.SH MEMBER FUNCTION DOCUMENTATION
+.SH "QPicture::QPicture ( int formatVersion = -1 )"
+Constructs an empty picture.
+.PP
+The \fIformatVersion\fR parameter may be used to \fIcreate\fR a QPicture that can be read by applications that are compiled with earlier versions of Qt.
+.TP
+\fIformatVersion\fR == 1 is binary compatible with Qt 1.x and later.
+.TP
+\fIformatVersion\fR == 2 is binary compatible with Qt 2.0.x and later.
+.TP
+\fIformatVersion\fR == 3 is binary compatible with Qt 2.1.x and later.
+.TP
+\fIformatVersion\fR == 4 is binary compatible with Qt 3.0.x and later.
+.TP
+\fIformatVersion\fR == 5 is binary compatible with Qt 3.1.
+.PP
+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.
+.PP
+Reading pictures generated by earlier versions of Qt is supported and needs no special coding; the format is automatically detected.
+.SH "QPicture::QPicture ( const QPicture & pic )"
+Constructs a shallow copy of \fIpic\fR.
+.SH "QPicture::~QPicture ()"
+Destroys the picture.
+.SH "QRect QPicture::boundingRect () const"
+Returns the picture's bounding rectangle or an invalid rectangle if the picture contains no data.
+.SH "QPicture QPicture::copy () const\fC [protected]\fR"
+Returns a deep copy of the picture.
+.SH "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.
+.PP
+See also size() and isNull().
+.SH "void QPicture::detach ()\fC [protected]\fR"
+Detaches from shared picture data and makes sure that this picture is the only one referring to the data.
+.PP
+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.
+.SH "bool QPicture::isNull () const"
+Returns TRUE if the picture contains no data; otherwise returns FALSE.
+.SH "bool QPicture::load ( const QString & fileName, const char * format = 0 )"
+Loads a picture from the file specified by \fIfileName\fR and returns TRUE if successful; otherwise returns FALSE.
+.PP
+By default, the file will be interpreted as being in the native QPicture format. Specifying the \fIformat\fR string is optional and is only needed for importing picture data stored in a different format.
+.PP
+Currently, the only external format supported is the W3C SVG format which requires the Qt XML module. The corresponding \fIformat\fR string is "svg".
+.PP
+See also save().
+.PP
+Examples:
+.)l picture/picture.cpp and xform/xform.cpp.
+.SH "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.
+.PP
+\fIdev\fR is the device to use for loading.
+.SH "int QPicture::metric ( int m ) const\fC [virtual protected]\fR"
+Internal implementation of the virtual QPaintDevice::metric() function.
+.PP
+Use the QPaintDeviceMetrics class instead.
+.PP
+A picture has the following hard-coded values: dpi=72, numcolors=16777216 and depth=24.
+.PP
+\fIm\fR is the metric to get.
+.SH "QPicture & QPicture::operator= ( const QPicture & p )"
+Assigns a shallow copy of \fIp\fR to this picture and returns a reference to this picture.
+.SH "bool QPicture::play ( QPainter * painter )"
+Replays the picture using \fIpainter\fR, and returns TRUE if successful; otherwise returns FALSE.
+.PP
+This function does exactly the same as QPainter::drawPicture() with (x, y) = (0, 0).
+.SH "bool QPicture::save ( const QString & fileName, const char * format = 0 )"
+Saves a picture to the file specified by \fIfileName\fR and returns TRUE if successful; otherwise returns FALSE.
+.PP
+Specifying the file \fIformat\fR 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.
+.PP
+Currently, the only external format supported is the W3C SVG format which requires the Qt XML module. The corresponding \fIformat\fR string is "svg".
+.PP
+See also load().
+.PP
+Example: picture/picture.cpp.
+.SH "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.
+.PP
+\fIdev\fR is the device to use for saving.
+.SH "void QPicture::setBoundingRect ( const QRect & r )"
+Sets the picture's bounding rectangle to \fIr\fR. The automatically calculated value is overriden.
+.SH "void QPicture::setData ( const char * data, uint size )\fC [virtual]\fR"
+Sets the picture data directly from \fIdata\fR and \fIsize\fR. This function copies the input data.
+.PP
+See also data() and size().
+.SH "uint QPicture::size () const"
+Returns the size of the picture data.
+.PP
+See also data().
+.SH RELATED FUNCTION DOCUMENTATION
+.SH "QDataStream & operator<< ( QDataStream & s, const QPicture & r )"
+Writes picture \fIr\fR to the stream \fIs\fR and returns a reference to the stream.
+.SH "QDataStream & operator>> ( QDataStream & s, QPicture & r )"
+Reads a picture from the stream \fIs\fR into picture \fIr\fR and returns
+a reference to the stream.
+
+.SH "SEE ALSO"
+.BR http://doc.trolltech.com/ntqpicture.html
+.BR http://www.trolltech.com/faq/tech.html
+.SH COPYRIGHT
+Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
+license file included in the distribution for a complete license
+statement.
+.SH AUTHOR
+Generated automatically from the source code.
+.SH BUGS
+If you find a bug in Qt, please report it as described in
+.BR http://doc.trolltech.com/bughowto.html .
+Good bug reports help us to help you. Thank you.
+.P
+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.
+.P
+If you find errors in this manual page, please report them to
+.BR qt-bugs@trolltech.com .
+Please include the name of the manual page (tqpicture.3qt) and the Qt
+version (3.3.8).