Hi Angus and the Matplotlib community,
I'm finally getting around to trying your suggestions, which at first
blush seem like they'd do what I want, so THANKS for that!
But I'm still running into issues for which I'm uncertain how to
proceed. I outline my stumbling blocks below, which have to do with
what I'd like my app to do. No doubt my understanding of writing GUI-
style code in Python/matplotlib is lacking, but it seems my app needs
more structure than the typical usage of mouse clicks in matplotlib.
I outline my thinking below.
On Mar 23, 2007, at 6:11 PM, Angus McMorland wrote:
> ---------------------------
> from pylab import figure
>
> class gui :
> def __init__(self, callback) :
> self.f = figure()
> self.ax = self.f.add_subplot(111)
> self.ax.plot([1,2,3])
> self.data = None # valid mouse click hasn't yet happened
> def clicker(event):
> self.data = event.xdata
> if 1 <= self.data <= 3:
> callback(self.data)
> self.f.canvas.mpl_connect("button_press_event",clicker)
> print "Waiting for valid mouse click..."
>
> ----------------------------
> then in your application (or shell):
>
> def my_cb(inp):
> # processing here
> print inp
>
> g = gui(my_cb)
>
> No polling required, and you only get the valid clicks calling your
> routine. I hope that helps,
My app needs to look something like this:
------
create a game and display it in a matplotlib figure
while game not over :
if its player 1's turn, get player 1's valid mouse input,
otherwise get player 2's
once we've got a valid mouse click, update game to make the
corresponding move for the current player's turn
update the figure to display this change
check if someone's won or game's a draw, only upon which do we
break out of the while
after having a result, report the answer, do some book keeping, and
then return from the app
------
I've not been able to figure out how to unwind this app into
something that only needs to progress when there's been a valid mouse
click. If I understand your suggestion correctly, it seems the entire
app should be the callback, but the processing of the clicks by the
app is complicated.
I wonder if you mean I should massage the app so that it IS the
callback, but its got enough state that to figure out how to execute
the appropriate next portion of code seems like it would be a big
mess (e.g. I'd have to write some kind of FSM whose transitions were
mouse clicks). I might be able to make this work, but its gonna be
ugly. It also breaks some of the OO I'd been using in other settings.
What I think I want is a way to get blocking valid mouse input. I had
thought the Python yield statement might help me (for instance, when
I'm supposed to get the next mouse click, I call yield and then the
callback would somehow wake the application back up), but it is
described in Python as being used only with generator functions, so I
don't think that does the trick.
I'm fairly new to Python, and even more so to maptlotlib, but I've
used matlab plenty. There, there's a ginput function that returns a
value only when the mouse's been clicked. Obviously there's some dual-
threading going on, but I've never had to write it myself.
I've spent several hours searching on the internet and haven't come
up with much. One scheme that might work would be to use sockets to
control the passing of info. But that seems overkill.
A big part of my problem from the matplotlib end is the only info
I've been able to find on using mouse clicks are basically not app-
based, e.g. http://www.scipy.org/Cookbook/Matplotlib/
Interactive_Plotting. There, the callbacks simply redraw the screen
by labeling data or whatnot, but there's no sophisticated "main"
program running at the same time.
Any ideas?
Thx,
--b
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