[Bugs] #2438 UNSP: For speed, Physics redraw should be based on dirty rects, not full screen updating

[Sugar Labs Bugs]

#2438: For speed, Physics redraw should be based on dirty rects, not full screen
updating
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    Reporter:  garycmartin                |          Owner:  garycmartin                
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Physics                    |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:                             |  
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 Physics is currently using a fullscreen update on every frame, should be
 quite a lot faster if it is switched to tracking dirty rects and just
 redrawing those areas. Might need to delve into the Elements library code
 and Box2d to achieve this unfortunately.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2438>
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