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Re: [udig-devel] Problem with my MapGraphic implementation. Please Help
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Hi.
It sounds to me like since you want actual animation you may want to
use an animation instead. For now the API is rather poor. I plan on
integrating the timing framework later on. But for now look into
IAnimation and AnimationUpdater to run the animation.
The problem with using an animation is that it something must start
it. I'd suggest that when your map graphic is called to render it
starts the animation (if it is not already running). Draw commands
(and IAnimations) are drawn on the Acetate layer and are removed
during certain rendering actions, such as a zoom in. Because of this
you may find that you have to put a timestamp on you animation to
make sure that it keeps running and isn't disposed of.
I'm not sure this email completely makes sense. Please let me know
if you have a question.
Jesse
On Oct 8, 2007, at 8:57 AM, Ingmar Eveslage wrote:
Hello,
I have a problem with the plugin I developed. I implemented a
MapGraphic
Extension which draw rectangles on a given position on the map.
I also implemented a thread which modifies the data that is drawn
and then
calls the Layer.refresh(Envelope) function to draw the MapGraphic
again with
the updated data. Then the thread takes a short break, modifies the
data
again and refreshes the layer again, and so on.
The MapGrahpics implementation uses double buffering and draws the
hidden
painted picture (a java.awt.image.BufferedImage) in the last line
of the
override draw(MapGraphicContext context) function.
All works fine, but because the MapGraphic.draw function takes some
time (i
paint many rectangles, and sometime circles) it has not finished
before the
"updating-thread" calls Layer.refresh again. if this happens the
MapGraphics
layer gets totally blank. As i said: only if the Layer.refresh call is
before the MapGrahics.draw function finishes its last redraw.
This is very distracting, because the MapGraphic layer with all my
rectangles and circles begin to flicker and sometimes when there
are many
updates the MapGraphic layer gets deleted short after its ready with
painting.
I hope someone can help me. I tried to find a way to suspend the
updating
thread until the MapGraphic layer completed the draw method, but i
didn't
find the right api call. after hours of debugging i could not even
find the
place where the layer gets blank.
So please help me.
Thanks forward
Ingmar
For info:
I use Eclipse 3.2 and the uDig SDK 1.1RC11 on a Intel Mac.
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View this message in context: http://www.nabble.com/Problem-with-my-
MapGraphic-implementation.-Please-Help-tf4588290.html#a13096935
Sent from the udig-devel mailing list archive at Nabble.com.
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