On 24/03/07, belinda thom <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I'm trying to write a very simple GUI using matplotlib and have
> gotten stuck. Hopefully someone out there has done something similar
> and can point me on my way.
>
> First, I should mention that the examples provided with matplotlib
> weren't immediately helpful to me, because when I try to run various
> demos (like pick_event_demo or object_picker) it fails b/c I'm
> relying on (and have to rely on) TkAgg. Sadly, I'm too new to
> understand what I would need to do to get those demos working. So I
> found someone processing mouseclicks using a Mac online and started
> there.
>
> I ended up with something like this:
>
> from pylab import *
> class gui :
> def __init__(self) :
> self.f = figure()
> self.data = None # valid mouse click hasn't yet happened
> def clicker(event):
> self.data = event.xdata
> self.f.canvas.mpl_connect("button_press_event",clicker)
>
> def getNextValidClick(self) :
> (data, self.data) = (None, None)
> while True :
> print "Waiting for valid mouse click..."
> while self.data == None :
> pass # keep polling
> if 1 <= self.data <= 3 :
> # consider this a valid next mouse click
> (data, self.data) = (self.data, None)
> break
> return data
>
> With which I tried:
>
> g = gui()
> x = g.getNextValidClick()
>
> but the latter line caused me to experience the spinning wheel of
> dead that we mac users so enjoy.
>
> I have the feeling I need to explicitly yield or some such in the
> poll loop, but I don't know how to do that.
>
> Advice greatly appreciated, both on the code I've provided, and on if
> there is a better way altogether to provide an app with data obtained
> via a matplotlib mouse click callback.
>
> Thanks,
>
> --b
It's the polling that's the problem. Why not use a slightly different
approach, like this:
---------------------------
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,
A.
--
AJC McMorland, PhD Student
Physiology, University of Auckland
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