On Thu, Jun 7, 2012 at 9:07 AM, David Craig <dcdavem...@gmail.com> wrote:
> Hi,
> I trying to define an area in a pcolor plot (several plots) using the
> ginput(). However since it is an irregular shape and will be different in
> each plot so I cant define how many points there will be before hand, I've
> tried the following but it requires a double click at each point, which I
> would like to avoid as it duplicates points
>
> x = randn(10,10)
> imshow(x)
>
> button = False
> points = []
> while button == False:
> points.append(ginput(1))
> button = waitforbuttonpress()
>
> Anyone know a better way to go about this??
> thanks
> Dave
>
>
I would utilize the event handling mechanism within mpl to do this. You
can create a function that would append the xy coordinates to points at
each call. Here is a mockup.
def on_press(event) :
on_press.points.append((event.xdata, event.ydata))
on_press.points = []
Then, you would need some way to indicate that you want to start and
finish, such as some sort of key press:
def key_press(event) :
if event.key == 'a' :
if key_press.active :
key_press.mouse_cid =
key_press.fig.canvas.mpl_connect('button_press_event', on_press)
else :
key_press.fig.canvas.mpl_disconnect(key_press.mouse_cid)
key_press.active = not key_press.active
key_press.active = False
key_press.fig = plt.figure()
key_press.fig.canvas.mpl_connect('key_press_event', key_press)
There are some more elegant ways of doing this, particularly by creating
some sort of object to hold these variables, but this is a quick and dirty
way of doing it.
I hope that helps!
Ben Root
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