Detailed Description
The QCanvasPixmap class provides pixmaps for QCanvasSprites.
If you want to show a single pixmap on a QCanvas use a
QCanvasSprite with just one pixmap.
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.
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).
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.
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.
See also QCanvasPixmapArray, QCanvasItem, QCanvasSprite, Graphics Classes, and Image Processing Classes.
Member Function Documentation
QCanvasPixmap::QCanvasPixmap ( const QString & datafilename )
Constructs a QCanvasPixmap that uses the image stored in datafilename.
QCanvasPixmap::QCanvasPixmap ( const QImage & image )
Constructs a QCanvasPixmap from the image image.
QCanvasPixmap::QCanvasPixmap ( const QPixmap & pm, const QPoint & offset )
Constructs a QCanvasPixmap from the pixmap pm using the offset
offset.
QCanvasPixmap::~QCanvasPixmap ()
Destroys the pixmap.
int QCanvasPixmap::offsetX () const
Returns the x-offset of the pixmap's hotspot.
See also setOffset().
int QCanvasPixmap::offsetY () const
Returns the y-offset of the pixmap's hotspot.
See also setOffset().
void QCanvasPixmap::setOffset ( int x, int y )
Sets the offset of the pixmap's hotspot to (x, y).
Warning: Do not call this function if any QCanvasSprites are
currently showing this pixmap.
This file is part of the Qt toolkit.
Copyright © 1995-2005
Trolltech. All Rights Reserved.
