You can create an class to store these values with a method to handle
the callback, eg. (untested code):
class KeyHandler:
def __init__(self):
self.ImageNumber = 0
def OnKeyPress(self, event):
self.ImageNumber += 1
key_handler = KeyHandler()
plt.connect('key_press_event', key_handler.OnKeyPress)
Mike
On 12/11/2010 07:24 PM, John wrote:
> Hi all,
> I have set up an event handler and function to perform actions when a
> user presses certain keys in the plot window. The function needs access
> to variables that are in the main function. How do I pass these
> variables to the function.
>
> In OnKeyPress, ImageNumber and Li are objects in the main program. Any
> ideas on how to pass them? Thanks
>
> plt.connect('key_press_event',OnKeyPress)
>
> def OnKeyPress(self,event):
> print 'button= ',event.key, event.xdata, event.ydata
> if event.key == 'm':
> ImageNumber = ImageNumber + 1
> if event.key == 'n':
> ImageNumber = ImageNumber - 1
>
> rawimage = Li.GetImage(ImageNumber)
> plt.imshow(rawimage)
> plt.title("Image number %3d" % (ImageNumber))
> plt.draw()
>
>
> ------------------------------------------------------------------------------
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--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA
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