This is a specialization of the canvas interface for bitmapped
canvases.
Description
Specialization of a XBitmapCanvas, where moving, animated objects
(called sprites) are supported.
@attention The screen output of canvas drawing operations is
undefined, unless XSpriteCanvas::updateScreen() is called. This is
because a sprite canvas might choose to employ double buffering to
reduce animation flicker, and cannot know the instant suitable to
display the newly rendered canvas content. When using external
double-buffering via XBufferController on a sprite canvas, the
implementation takes care of this issue, and in this case is able
to render correctly even without explicit updateScreen() calls
(because there's a defined moment in time where content display
can happen, namely the XBufferController::showBuffer()) call. If
you don't need sprite functionality, and don't want the
updateScreen hassle, simply use the XBitmapCanvas.
Create a cloned version of an already existing sprite
object.
The cloned sprite always shows the same content as its
original. Furthermore, cloned copies of a hidden original are
never visible, although cloned copies of a visible original
can of course be invisible.
Tells the sprite canvas to now update the screen
representation.
Required to display rendered changes to the canvas, and
updates to stopped animations and XCustomSprites in
general. This method will return only after the screen update
is done, or earlier if an error happened.
Create a custom, user-handles-it-all sprite object.
A sprite is a back-buffered object with its own, independent
animation.
Parameter spriteSize
The required size of the sprite in device
coordinates. Everything that is rendered outside this area
might be clipped on output. Both components of the size must
be greater than zero.
Create a cloned version of an already existing sprite
object.
The cloned sprite always shows the same content as its
original. Furthermore, cloned copies of a hidden original are
never visible, although cloned copies of a visible original
can of course be invisible.
Parameter original
The original sprite to copy the content from. This sprite must
have been created by the same XSpriteCanvas instance as this
method is called on. Other sprite instances will generate an
IllegalArgumentException.
Tells the sprite canvas to now update the screen
representation.
Required to display rendered changes to the canvas, and
updates to stopped animations and XCustomSprites in
general. This method will return only after the screen update
is done, or earlier if an error happened.
If double buffering is enabled via XBufferController, no
explicit call of updateScreen() is necessary, since the
XBufferController methods will automatically notify all
associated XSpriteCanvas instances.
Parameter bUpdateAll
When true , update the whole screen. When false ,
implementation is permitted to restrict update to areas the
canvas itself changed (e.g. because of render operations, or
changes on the sprites). The former is useful for updates
after window expose events. the latter for animation display.
Returns
true , if the screen update was successfully
performed
