qcanvaspixmap.3qt

Linux下的基于X11的图形开发环境。

'\" t
.TH QCanvasPixmap 3qt "9 December 2002" "Trolltech AS" \" -*- nroff -*-
.\" Copyright 1992-2001 Trolltech AS.  All rights reserved.  See the
.\" license file included in the distribution for a complete license
.\" statement.
.\"
.ad l
.nh
.SH NAME
QCanvasPixmap \- Pixmaps for QCanvasSprites
.SH SYNOPSIS
\fC#include <qcanvas.h>\fR
.PP
Inherits QPixmap.
.PP
.SS "Public Members"
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.BI "\fBQCanvasPixmap\fR ( const QString & datafilename )"
.br
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.BI "\fBQCanvasPixmap\fR ( const QImage & image )"
.br
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.BI "\fBQCanvasPixmap\fR ( const QPixmap & pm, const QPoint & offset )"
.br
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.BI "\fB~QCanvasPixmap\fR ()"
.br
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.BI "int \fBoffsetX\fR () const"
.br
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.BI "int \fBoffsetY\fR () const"
.br
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.BI "void \fBsetOffset\fR ( int x, int y )"
.br
.in -1c
.SH DESCRIPTION
The QCanvasPixmap class provides pixmaps for QCanvasSprites.
.PP
If you want to show a single pixmap on a QCanvas use a QCanvasSprite with just one pixmap.
.PP
When pixmaps are inserted into a QCanvasPixmapArray they are held as QCanvasPixmaps. QCanvasSprites are used to show pixmaps on QCanvases and hold their pixmaps in a QCanvasPixmapArray. If you retrieve a frame (pixmap) from a QCanvasSprite it will be returned as a QCanvasPixmap.
.PP
The pixmap is a QPixmap and can only be set in the constructor. There are three different constructors, one taking a QPixmap, one a QImage and one a file name that refers to a file in any supported file format (see QImageIO).
.PP
QCanvasPixmap can have a hotspot which is defined in terms of an (x, y) offset. When you create a QCanvasPixmap from a PNG file or from a QImage that has a QImage::offset(), the offset() is initialized appropriately, otherwise the constructor leaves it at (0, 0). You can set it later using setOffset(). When the QCanvasPixmap is used in a QCanvasSprite, the offset position is the point at QCanvasItem::x() and QCanvasItem::y(), not the top-left corner of the pixmap.
.PP
Note that for QCanvasPixmap objects created by a QCanvasSprite, the position of each QCanvasPixmap object is set so that the hotspot stays in the same position.
.PP
See also QCanvasPixmapArray, QCanvasItem, QCanvasSprite, Graphics Classes, and Image Processing Classes.
.SH MEMBER FUNCTION DOCUMENTATION
.SH "QCanvasPixmap::QCanvasPixmap ( const QString & datafilename )"
Constructs a QCanvasPixmap that uses the image stored in \fIdatafilename\fR.
.SH "QCanvasPixmap::QCanvasPixmap ( const QImage & image )"
Constructs a QCanvasPixmap from the image \fIimage\fR.
.SH "QCanvasPixmap::QCanvasPixmap ( const QPixmap & pm, const QPoint & offset )"
Constructs a QCanvasPixmap from the pixmap \fIpm\fR using the offset \fIoffset\fR.
.SH "QCanvasPixmap::~QCanvasPixmap ()"
Destroys the pixmap.
.SH "int QCanvasPixmap::offsetX () const"
Returns the x-offset of the pixmap's hotspot.
.PP
See also setOffset().
.SH "int QCanvasPixmap::offsetY () const"
Returns the y-offset of the pixmap's hotspot.
.PP
See also setOffset().
.SH "void QCanvasPixmap::setOffset ( int x, int y )"
Sets the offset of the pixmap's hotspot to (\fIx\fR, \fIy\fR).
.PP
\fBWarning:\fR Do not call this function if any QCanvasSprites are
currently showing this pixmap.

.SH "SEE ALSO"
.BR http://doc.trolltech.com/qcanvaspixmap.html
.BR http://www.trolltech.com/faq/tech.html
.SH COPYRIGHT
Copyright 1992-2001 Trolltech AS, 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 [e-mail] .
Please include the name of the manual page (qcanvaspixmap.3qt) and the Qt
version (3.1.1).