Greg Ewing wrote: >Michiel Jan Laurens de Hoon wrote: > > >>Greg Ewing wrote: >> >> >>>How about running your event loop in a separate thread? >>> >>> >>I agree that this works for some extension modules, but not very well >>for extension modules for which graphical performance is critical >> >> > >I don't understand. If the main thread is idle, your thread >should get all the time it wants. > >I'd actually expect this to give better interactive response, >since you aren't doing busy-wait pauses all the time -- the >thread can wake up as soon as an event arrives for it. > > This is exactly the problem. Drawing one picture may consist of many Python commands to draw the individual elements (for example, several graphs overlaying each other). We don't know where in the window each element will end up until we have the list of elements complete. For example, the axis may change (see my example to Martin). Or, if we're drawing a 3D picture, then one element may obscure another.
Now, if we have our plotting extension module in a separate thread, the window will be repainted each time a new element is added. Imagine a picture of 1000 elements: we'd have to draw 1+2+...+1000 times. So this is tricky: we want repainting to start as soon as possible, but not sooner. Being able to hook into Python's event loop allows us to do so. --Michiel. -- Michiel de Hoon Center for Computational Biology and Bioinformatics Columbia University 1150 St Nicholas Avenue New York, NY 10032 _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
