You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
256 lines
9.4 KiB
256 lines
9.4 KiB
'\" 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 ( TQIODevice * dev, const char * format = 0 )"
|
|
.br
|
|
.ti -1c
|
|
.BI "bool \fBload\fR ( const TQString & fileName, const char * format = 0 )"
|
|
.br
|
|
.ti -1c
|
|
.BI "bool \fBsave\fR ( TQIODevice * dev, const char * format = 0 )"
|
|
.br
|
|
.ti -1c
|
|
.BI "bool \fBsave\fR ( const TQString & 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, TQt 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 TQt 1.x and later.
|
|
.TP
|
|
\fIformatVersion\fR == 2 is binary compatible with TQt 2.0.x and later.
|
|
.TP
|
|
\fIformatVersion\fR == 3 is binary compatible with TQt 2.1.x and later.
|
|
.TP
|
|
\fIformatVersion\fR == 4 is binary compatible with TQt 3.0.x and later.
|
|
.TP
|
|
\fIformatVersion\fR == 5 is binary compatible with TQt 3.1.
|
|
.PP
|
|
Note that the default formatVersion is -1 which signifies the current release, i.e. for TQt 3.1 a formatVersion of 5 is the same as the default formatVersion of -1.
|
|
.PP
|
|
Reading pictures generated by earlier versions of TQt 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 TQString & 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 TQt 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 ( TQIODevice * 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 TQString & 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 TQt XML module. The corresponding \fIformat\fR string is "svg".
|
|
.PP
|
|
See also load().
|
|
.PP
|
|
Example: picture/picture.cpp.
|
|
.SH "bool QPicture::save ( TQIODevice * 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 TQt documentation is provided in HTML format; it is
|
|
located at $TQTDIR/doc/html and can be read using TQt 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).
|