Java Reference
In-Depth Information
3.
Get the component—a
Canvas
when using the MIDP—on which the
SVGAnimator
will render the image.
4.
Set the bounds of the
SVGImage
to the bounds the
SVGAnimator
's component.
5.
Make the
SVGAnimator
's component visible.
6.
Use the
SVGAnimator
to start playing the animation.
When rendering an animated SVG, the
SVGAnimator
implementation uses the desired
SVG image and a container of some kind provided by the platform's actual GUI hierarchy,
such as the MIDP or the AWT. The designers of the
SVGAnimator
class assumed that it
would be used on both CLDC and CDC platforms, so it doesn't return a specific instance
of an MIDP class such as
Canvas
. Instead, the
SVGAnimator
provides the
getTargetComponent
to return a component into which it renders the SVG, much as an MMAPI
VideoControl
instance returns a component via its
initDisplayComponent
method. When using the
SVGAPI on an MIDP platform, the object that
getTargetComponent
returns is a
Canvas
instance; on other platforms, it's a subclass of
Component
. Thus, on MIDP platforms,
you can use the
Display
class's
setCurrent
method to set the resulting
Canvas
as the
Displayable
to draw; on other platforms, you can insert the resulting component into
the appropriate container in your GUI's view hierarchy.
The
SVGAnimator
class implements an update thread, which it uses to render the SVG
image as an animated image. The thread itself implements a simple state machine with
the three states that you see in Figure 16-5.
Figure 16-5.
The SVGAnimator state machine
