[Singular]

Hey all,

Recently started doing some blackberry development, specifically a game, and have this question (JDE 4.5):

If I do not want to repaint the entire screen, apparently invalidate is supposed to work with regions of the screen vs the entire screen if so desired.

This seems to work, but I cannot seem to "chain" invalidates together.

The reason I want to do this is to do dirty updating of the screen for efficiency reasons, but the implementation of invalidate seems to take the minimum x,y, and maximum x,y and paint the entire region, instead of the single regions I specify. Not sure if that makes sense, but it probably would to someone who has done this before.

Also, is there a way to reliably render to the screen without having to rely on the message pump calling paint?

Cheers,

[simon.hain]

don't you use fields or managers? you can invalidate them one by one. other then that you will have to call it multiple times. i don't know how this influences performance, should be fairly low level.

[Singular]

No, I don't. I use a FullScreen object that currently invalidates the entire screen every time there is a "Heartbeat" event in the game engine.

Dirty updating is usefull in application where the actual displaying of graphics is the bottleneck, as it traditionally improves frame-rate, at the expense of forcing the application to keep track of what areas of the screen need to be updated. I've proven to myself that selectively updating dirty of the screen will yield up to 50 FPS on my Curve. Unfortunately, I seem to be limited in what will invalidate when I call invalidate multiple times, as it does not perform as expected.

Thanks