Update on the error.
It occurs in the following cases:
- User clicks and drags from left to right and approaches the edge of the
right side of the axes
- User clicks and drags from right to left and approaches the edge of the
left side of the axes
I'm working on this bug now, I'll see if I can fix it. I'll welcome any
input you guys can provide though.
Thanks,
Aman
On Wed, Jul 21, 2010 at 1:58 PM, Aman Thakral <aman.thak...@gmail.com>wrote:
> Hi all,
>
> I'm getting the following exception when I use the Span Selector. It
> happens when I try and select the entire region.
>
> Exception in Tkinter callback
>
> Traceback (most recent call last):
> File "C:\Python26\lib\lib-tk\Tkinter.py", line 1410, in __call__
> return self.func(*args)
> File
> "C:\Python26\Lib\site-packages\matplotlib\backends\backend_tkagg.py", line
> 246, in motion_notify_event
> FigureCanvasBase.motion_notify_event(self, x, y, guiEvent=event)
> File "C:\Python26\Lib\site-packages\matplotlib\backend_bases.py", line
> 1245, in motion_notify_event
> self.callbacks.process(s, event)
> File "C:\Python26\Lib\site-packages\matplotlib\cbook.py", line 165, in
> process
> func(*args, **kwargs)
> File "C:\Python26\Lib\site-packages\matplotlib\widgets.py", line 952, in
> onmove
> self.rect.set_width(maxv-minv)
> TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'
>
>
> My sample code is shown here (its also attached):
>
> import matplotlib.pyplot as plt
> from matplotlib.widgets import SpanSelector
> import numpy as np
> import datetime
>
> class TimeSelector(SpanSelector):
> """
> SpanSelector that is only activated by the left mouse button
> """
> def ignore(self,event):
> if event.button == 2 or event.button == 3: return True
>
> def onselect(xmin,xmax):
> print xmin,xmax
>
> fig = plt.figure()
> ax = fig.add_subplot(111)
> span = TimeSelector(ax, onselect, 'horizontal', useblit=True,
> rectprops=dict(alpha=0.5, facecolor='yellow') )
>
> y = np.random.rand(100,1)
> start = datetime.datetime(2010,7,15,0,0)
> x = []
> for i in range(len(y)):
> x.append(start + datetime.timedelta(hours=i))
>
> ax.plot_date(x,y,'b-')
> plt.show()
>
> Any help on this issue would be greatly appreciated.
>
> Thanks,
> Aman
>
--
Aman Thakral
B.Eng & Biosci, M.Eng Design
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