[Newbies] Strange bug with Morphic

Bert Freudenberg bert at freudenbergs.de
Wed Mar 16 15:46:58 UTC 2011

On 16.03.2011, at 16:40, Bert Freudenberg wrote:

> On 16.03.2011, at 11:33, Martin Nilsson wrote:
>> Now, my question is: what magic does this call to Transcript do which causes my game to update correctly
> It performs a "world cycle", which causes a redraw.
>> , and what message should I send instead to get the same effect, even without a Transcript window open ?
> You could write "self world doOneCycleNow". However, this normally hints at a design flaw.
> Morphic is an event-driven system. It has a main loop that processes events, then redraws the changed parts of the world.
> Since your code does not "return" to the main loop while doing the AI, the UI will not update. The "proper" way would be doing the UI in a background process, which would notify the UI process when done. Then other things could happen in parallel to the AI "thinking".

I meant to write "doing the AI in a background process" of course.

> If you don't care about the world being frozen while the AI is doing its thing, then you don't need a background process, and forcing a world cycle to update the display is fine. Certainly simpler.

- Bert -

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