matplotlib-users Mailing List for matplotlib

>>>>> "Tommy" == Tommy Grav <tg...@ma...> writes:

    Tommy> Thanks for the solution. That gives me a good starting
    Tommy> point for further development. However, now I have a follow
    Tommy> up question. Is there a way to return the x and y positions
    Tommy> of the button click from the event (out to the main program
    Tommy> I mean).

Sure -- just use a class to store the coord data, and implement the
__call__ method so it can be used as a callback

    class Coords:

        def __init__(self):
            self.x, self.y = None, None

        def __str__(self):
            return 'x=%s, y=%s'%(self.x, self.y)

        def __call__(self, event):
            if event.button!=1: return
            x,y = event.xdata, event.ydata
            if x is not None: axzoom.set_xlim(x-0.05, x+0.05)
            if y is not None: axzoom.set_ylim(y-0.05, y+0.05)
            figzoom.canvas.draw()
            self.x, self.y = x, y

    coords = Coords()
    figsrc.canvas.mpl_connect('button_press_event', coords)

Then you can use coords.x and coords.y wherever you want...

JDH

Thanks for the solution. That gives me a good starting point
for further development. However, now I have a follow up
question. Is there a way to return the x and y positions of the
button click from the event (out to the main program I mean).

Cheers
Tommy


tg...@ma...
http://homepage.mac.com/tgrav/

"Any intelligent fool can make things bigger,
more complex, and more violent. It takes a
touch of genius -- and a lot of courage --
to move in the opposite direction"
                          -- Albert Einstein

>>>>> "Tommy" == Tommy Grav <tg...@ma...> writes:

    Tommy> I am using matplotlib to display an image, then click on
    Tommy> the image to get the x,y center of an object in that
    Tommy> image. Using this x,y position I would like to display a
    Tommy> zoomed in version of the image in another window. I am
    Tommy> however confused on how to generate the second window and
    Tommy> how to deal with the fact that I now want the button click
    Tommy> in window 2 to another event function.

Something like this?

from pylab import figure, show, nx
figsrc = figure()
figzoom = figure()

axsrc = figsrc.add_subplot(111, xlim=(0,1), ylim=(0,1), autoscale_on=False)
axzoom = figzoom.add_subplot(111, xlim=(0.45,0.55), ylim=(0.4,.6), autoscale_on=False)
axsrc.set_title('Click to zoom')
axzoom.set_title('zoom window')
x,y,s,c = nx.mlab.rand(4,200)
s *= 200


axsrc.scatter(x,y,s,c)
axzoom.scatter(x,y,s,c)

def onpress(event):
    if event.button!=1: return
    x,y = event.xdata, event.ydata
    axzoom.set_xlim(x-0.1, x+0.1)
    axzoom.set_ylim(y-0.1, y+0.1)
    figzoom.canvas.draw()

figsrc.canvas.mpl_connect('button_press_event', onpress)
show()
    

I am using matplotlib to display an image, then click on the image to  
get the x,y center of
an object in that image. Using this x,y position I would like to  
display a zoomed in version
of the image in another window. I am however confused on how to  
generate the second
window and how to deal with the fact that I now want the button click  
in window 2 to another
event function.

Cheers
Tommy


tg...@ma...
http://homepage.mac.com/tgrav/

"Any intelligent fool can make things bigger,
more complex, and more violent. It takes a
touch of genius -- and a lot of courage --
to move in the opposite direction"
                          -- Albert Einstein