On Wed, Jun 10, 2009 at 6:55 AM, Ole Streicher<[email protected]> wrote:
> Hi again,
>
> when right-clicking on one or more lines in a plot, I want to present
> the user a context menu where he can select to remove these lines.
>
> Preferrably I want to do this not with a 'pick_event' connection but
> with the (Qt) backend methods since the context menu should contain more
> options (which shall be shown also when right-clicking on the diagram
> background).
>
> Unfortunately, I have no idea, how to do this. At first, I found only
> the pick_event() which responds to a left mouse click. Is there a way to
> get the Line2D instances that would be picked by specifying the mouse
> position?
The pick_event is fired off with any mouse press. See the following
example: you can select the line with the left or right mouse button::
import numpy as np
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
x = np.arange(10)
line1, = ax.plot(x, x, picker=5, label='x')
line2, = ax.plot(x, x*2, picker=5, label='x^2')
def on_pick(pickevent):
thisline = pickevent.artist
print 'you picked line=%s with button=%s'%(
thisline.get_label(), pickevent.mouseevent.button)
fig.canvas.mpl_connect('pick_event', on_pick)
plt.show()
If for some reason the built in pick_event is unsuitable, you can
create your own matplotlib.backend_bases.MouseEvent and call
line.contains(event) for each line you want to hit test.
http://matplotlib.sourceforge.net/api/artist_api.html#matplotlib.lines.Line2D.contains
http://matplotlib.sourceforge.net/api/backend_bases_api.html#matplotlib.backend_bases.MouseEvent
JDH
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