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Thread: Repainting of GVT Tree
Repainting of GVT Tree
country flaguser name
United States		 2007-10-01 05:22:26 
I am doing an animation operation upon some svg rectangles.

In order to achieve better performance,  i am directly
modifying the GVT
Tree "Inside the UpdateManager's thread", however
the when i move an
external window over the svg canvas, the GVT tree does not
repaint itself.
All of the contents which i draw using GVT nodes are erased.
I suspect that
we need to do some sort of repainting which is not required
when we do
changes through DOM.

How does the repainting of GVT tree work? 
How can i make changes to the GVT persistent?

Naveed
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Re: Repainting of GVT Tree
country flaguser name
United States		 2007-10-04 07:20:20 

  


  

    

Hi Naveed,



noni_4444 <naveed.0972gmail.com&gt; wrote on 10/01/2007
06:22:26 AM:



&gt; In order to achieve better performance,  i am directly modifying

the GVT

> Tree "Inside the UpdateManager's thread&quot;, however the when
i move an

> external window over the svg canvas, the GVT tree does not repaint
itself.



   Right the canvas uses it's offscreen

buffer to update the screen.




> All of the contents which i draw using GVT nodes
are erased. I suspect that

>; we need to do some sort of repainting which is not required when we
do

&gt; changes through DOM.




   Well none of your changes are persisted

anywhere, they only exist while

you are doing the actual drawing.  If you updated
the transform/coords of

the Graphics Node then you wouldn't need to do any
drawing and everything

would happen correctly.



> How does the repainting of GVT tree work? 



   When a GraphicsNode is changed it registers

a dirty region with

the UpdateTracker which the UpdateManager then uses
to know what

regions of an offscreen buffer need to be repainted

by the GVT tree...




> How can i make changes to the GVT persistent?



   Actually change the GVT by calling one
or more of the

'setXXX' methods on the GraphicsNodes.


  

  
  
   
     
    






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