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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