QCanvasSprite(3qt)QCanvasSprite(3qt)NAME
QCanvasSprite - Animated canvas item on a QCanvas
SYNOPSIS
#include <qcanvas.h>
Inherits QCanvasItem.
Public Members
QCanvasSprite ( QCanvasPixmapArray * a, QCanvas * canvas )
void setSequence ( QCanvasPixmapArray * a )
virtual ~QCanvasSprite ()
virtual void move ( double nx, double ny, int nf )
void setFrame ( int f )
enum FrameAnimationType { Cycle, Oscillate }
virtual void setFrameAnimation ( FrameAnimationType type = Cycle, int
step = 1, int state = 0 )
int frame () const
int frameCount () const
virtual int rtti () const
virtual QRect boundingRect () const
int width () const
int height () const
int leftEdge () const
int topEdge () const
int rightEdge () const
int bottomEdge () const
int leftEdge ( int nx ) const
int topEdge ( int ny ) const
int rightEdge ( int nx ) const
int bottomEdge ( int ny ) const
QCanvasPixmap * image () const
virtual QCanvasPixmap * imageAdvanced () const
QCanvasPixmap * image ( int f ) const
virtual void advance ( int phase )
virtual void draw ( QPainter & painter )
DESCRIPTION
The QCanvasSprite class provides an animated canvas item on a QCanvas.
A canvas sprite is an object which can contain any number of images
(referred to as frames), only one of which is current, i.e. displayed,
at any one time. The images can be passed in the constructor or set or
changed later with setSequence(). If you subclass QCanvasSprite you can
change the frame that is displayed periodically, e.g. whenever
QCanvasItem::advance(1) is called to create the effect of animation.
The current frame can be set with setFrame() or with move(). The number
of frames available is given by frameCount(). The bounding rectangle of
the current frame is returned by boundingRect().
The current frame's image can be retrieved with image(); use
imageAdvanced() to retrieve the image for the frame that will be shown
after advance(1) is called. Use the image() overload passing it an
integer index to retrieve a particular image from the list of frames.
Use width() and height() to retrieve the dimensions of the current
frame.
Use leftEdge() and rightEdge() to retrieve the current frame's left-
hand and right-hand x-coordinates respectively. Use bottomEdge() and
topEdge() to retrieve the current frame's bottom and top y-coordinates
respectively. These functions have an overload which will accept an
integer frame number to retrieve the coordinates of a particular frame.
QCanvasSprite draws very quickly, at the expense of memory.
The current frame's image can be drawn on a painter with draw().
Like any other canvas item, canvas sprites can be moved with move()
which sets the x and y coordinates and the frame number, as well as
with QCanvasItem::move() and QCanvasItem::moveBy(), or by setting
coordinates with QCanvasItem::setX(), QCanvasItem::setY() and
QCanvasItem::setZ().
See also Graphics Classes and Image Processing Classes.
Member Type Documentation
QCanvasSprite::FrameAnimationType
This enum is used to identify the different types of frame animation
offered by QCanvasSprite.
QCanvasSprite::Cycle - at each advance the frame number will be
incremented by 1 (modulo the frame count).
QCanvasSprite::Oscillate - at each advance the frame number will be
incremented by 1 up to the frame count then decremented to by 1 to 0,
repeating this sequence forever.
MEMBER FUNCTION DOCUMENTATIONQCanvasSprite::QCanvasSprite ( QCanvasPixmapArray * a, QCanvas * canvas )
Constructs a QCanvasSprite which uses images from the
QCanvasPixmapArray a.
The sprite in initially positioned at (0, 0) on canvas, using frame 0.
QCanvasSprite::~QCanvasSprite () [virtual]
Destroys the sprite and removes it from the canvas. Does not delete the
images.
void QCanvasSprite::advance ( int phase ) [virtual]
Extends the default QCanvasItem implementation to provide the
functionality of setFrameAnimation().
The phase is 0 or 1: see QCanvasItem::advance() for details.
See also QCanvasItem::advance() and setVelocity().
Example: canvas/canvas.cpp.
Reimplemented from QCanvasItem.
int QCanvasSprite::bottomEdge () const
Returns the y-coordinate of the current bottom edge of the sprite.
(This may change as the sprite animates since different frames may have
different bottom edges.)
See also leftEdge(), rightEdge(), and topEdge().
int QCanvasSprite::bottomEdge ( int ny ) const
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Returns what the y-coordinate of the top edge of the sprite would be if
the sprite (actually its hotspot) were moved to y-position ny.
See also leftEdge(), rightEdge(), and topEdge().
QRect QCanvasSprite::boundingRect () const [virtual]
Returns the bounding rectangle for the image in the sprite's current
frame. This assumes that the images are tightly cropped (i.e. do not
have transparent pixels all along a side).
Reimplemented from QCanvasItem.
void QCanvasSprite::draw ( QPainter & painter ) [virtual]
Draws the current frame's image at the sprite's current position on
painter painter.
Reimplemented from QCanvasItem.
int QCanvasSprite::frame () const
Returns the index of the current animation frame in the QCanvasSprite's
QCanvasPixmapArray.
See also setFrame() and move().
int QCanvasSprite::frameCount () const
Returns the number of frames in the QCanvasSprite's QCanvasPixmapArray.
int QCanvasSprite::height () const
The height of the sprite for the current frame's image.
See also frame().
QCanvasPixmap * QCanvasSprite::image () const
Returns the current frame's image.
See also frame() and setFrame().
QCanvasPixmap * QCanvasSprite::image ( int f ) const
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Returns the image for frame f. Does not do any bounds checking on f.
QCanvasPixmap * QCanvasSprite::imageAdvanced () const [virtual]
Returns the image the sprite will have after advance(1) is called. By
default this is the same as image().
int QCanvasSprite::leftEdge () const
Returns the x-coordinate of the current left edge of the sprite. (This
may change as the sprite animates since different frames may have
different left edges.)
See also rightEdge(), bottomEdge(), and topEdge().
int QCanvasSprite::leftEdge ( int nx ) const
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Returns what the x-coordinate of the left edge of the sprite would be
if the sprite (actually its hotspot) were moved to x-position nx.
See also rightEdge(), bottomEdge(), and topEdge().
void QCanvasSprite::move ( double nx, double ny, int nf ) [virtual]
Set the position of the sprite to nx, ny and the current frame to nf.
nf will be ignored if it is larger than frameCount() or smaller than 0.
int QCanvasSprite::rightEdge () const
Returns the x-coordinate of the current right edge of the sprite. (This
may change as the sprite animates since different frames may have
different right edges.)
See also leftEdge(), bottomEdge(), and topEdge().
int QCanvasSprite::rightEdge ( int nx ) const
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Returns what the x-coordinate of the right edge of the sprite would be
if the sprite (actually its hotspot) were moved to x-position nx.
See also leftEdge(), bottomEdge(), and topEdge().
int QCanvasSprite::rtti () const [virtual]
Returns 1 (QCanvasItem::Rtti_Sprite).
See also QCanvasItem::rtti().
Example: canvas/canvas.cpp.
Reimplemented from QCanvasItem.
void QCanvasSprite::setFrame ( int f )
Sets the animation frame used for displaying the sprite to f, an index
into the QCanvasSprite's QCanvasPixmapArray. The call will be ignored
if f is larger than frameCount() or smaller than 0.
See also frame() and move().
void QCanvasSprite::setFrameAnimation ( FrameAnimationType type = Cycle, int
step = 1, int state = 0 ) [virtual]
Sets the animation characteristics for the sprite.
For type == Cycle, the frames will increase by step at each advance,
modulo the frameCount().
For type == Oscillate, the frames will increase by step at each
advance, up to the frameCount(), then decrease by step back to 0,
repeating forever.
The state parameter is for internal use.
void QCanvasSprite::setSequence ( QCanvasPixmapArray * a )
Set the array of images used for displaying the sprite to the
QCanvasPixmapArray a.
If the current frame() is larger than the number of images in a, the
current frame will be reset to 0.
int QCanvasSprite::topEdge () const
Returns the y-coordinate of the top edge of the sprite. (This may
change as the sprite animates since different frames may have different
top edges.)
See also leftEdge(), rightEdge(), and bottomEdge().
int QCanvasSprite::topEdge ( int ny ) const
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Returns what the y-coordinate of the top edge of the sprite would be if
the sprite (actually its hotspot) were moved to y-position ny.
See also leftEdge(), rightEdge(), and bottomEdge().
int QCanvasSprite::width () const
The width of the sprite for the current frame's image.
See also frame().
SEE ALSO
http://doc.trolltech.com/qcanvassprite.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
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If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qcanvassprite.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QCanvasSprite(3qt)
