Here's a short follow up question:
Is there a concept of erasing in matplotlib? If I were to erase an
axvline that I drew earlier, how would I do that? Can you use del to
delete the object and then force a redraw?
-Soumyaroop
On Mon, May 2, 2011 at 11:35 AM, Soumyaroop Roy
<roy.soumyar...@gmail.com> wrote:
> Thanks Justin. I have the event handling thing in place and was really
> looking for drawing options. Thanks for the tips. I'll look into them.
> regards,
> Soumyaroop
>
> On Mon, May 2, 2011 at 11:06 AM, Justin McCann <jne...@gmail.com> wrote:
>>
>> You'll want to use event handling to figure out where the user clicked,
>> and then you have a couple of options: Axes.vlines(), or pylab.axvline(). It
>> seems like pylab.axvline() will always span the entire y-axis by default,
>> but with Axes.vlines() you need to specify the ymin/ymax. Maybe someone else
>> knows of an argument to pass to Axes.vlines() that will always span the
>> entire y-axis.
>> Here's the code (assuming 'ipython -pylab'):
>> ========
>> fig = figure()
>> plot([1,2,3,4], [5,6,7,8])
>> def onclick(event):
>> """Draw a vertical line spanning the axes every time the user clicks
>> inside them"""
>> if event.inaxes: # make sure the click was within a set of axes
>> pylab.axvline(event.xdata, axes=event.inaxes, color='r',
>> linestyle=':') # red dotted line
>> event.inaxes.figure.canvas.draw() # force a re-draw
>> cid = fig.canvas.mpl_connect('button_press_event', onclick) # add the
>> click handler
>> ... interact with it
>> fig.canvas.mpl_disconnect(cid) # get rid of the click-handler
>> ========
>> Docs:
>> Axes.vlines():
>> http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.vlines
>> pyplot.axvline():
>> http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.axvline
>> Event
>> handling: http://matplotlib.sourceforge.net/users/event_handling.html
>>
>> Example: http://matplotlib.sourceforge.net/examples/event_handling/data_browser.html
>> Justin
>>
>> On Mon, May 2, 2011 at 10:08 AM, Soumyaroop Roy <roy.soumyar...@gmail.com>
>> wrote:
>>>
>>> Any pointers on this?
>>> On Sat, Apr 30, 2011 at 12:34 AM, Soumyaroop Roy
>>> <roy.soumyar...@gmail.com> wrote:
>>>>
>>>> Hi there:
>>>> I have an x-y plot and I want to draw a vertical marker (an x=c line) on
>>>> the plot on a mouse click.
>>>> How should I approach it?
>>>> regards,
>>>> Soumyaroop
>>>
>>>
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