Hi Daniel, show should be called only once in a script (see also: http://matplotlib.sourceforge.net/faq/howto_faq.html?highlight=show#use-show) and it starts the mainloop, in which the user may interact with the plot using for instance button or key press events like in my second example. Whenever a key-press-event is recognized the function "event_fct" is called with the corresponding key-press-event as argument. This key-press-event holds information like which key was used etc.. All the possible interaction you can have with the plot in this case happens after the plt.show in the "mainloop", where matplotlib waits for events to happen and calls the corresponding functions, which were "connect"ed to the event. You will find more information about the event handling in the documentation of matplotlib (e.g. http://matplotlib.sourceforge.net/users/event_handling.html#event-handling- tutorial or the examples at http://matplotlib.sourceforge.net/examples/event_handling/index.html).
In my first example the trick is done by the function "waitforbuttonpress" and all the interaction happens before the show-command. Because I'm not so familiar with this function, I suggest you again to use the documentation and the examples to learn more about this functionality. Kind regards, Matthias On Monday, June 21, 2010 05:47:21 am you wrote: > Hi Matthias, > Thanks for the script! Now I would like to try to understand why it > works :) . In both of the scripts you sent me, plt.draw() is called > inside the loop to display each image file, and plt.show() is called > outside the loop at the end of the script. I guess what I find > confusing is, how is it that the images are displayed on screen, > inside the loop, *before* plt.show() is called? I would have expected > only the very last image inside the loop to be displayed, using this > program structure. So apparently there is something here I do not > understand... ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
