[Matplotlib-users] Canvas coordinates vs. Plot coordinates

[Matthew C. <mat...@gm...>]

Dear Group,

What I need to do is to
1. produce a plot (DONE)
2. fix it so that mouse clicks in the canvas append the x coordinate of the
click to a list (DONE)
3. add a couple of buttons to the GUI, to reset the list and to kill the
window (DONE)

So I'm pretty successful so far. The only problem is that the coordinates
are in canvas coordinates, not plot coordinates. Now, rather embarrassingly,
I can't figure out how to get this right. It seems to be the case that all
the examples are in  plot coordinates. As of course is the readout in the
GUI itself. Is there a simple way to fix this or do I have convert it to
some other backend? Or use something else instead of FigureCanvasGTK? This,
to me, made the most sense to me at the time of writing, although I must
confess I'm still pretty new to this.

I paste some stripped down code below.

Thanks in advance,
Matthew




#!/usr/bin/env python

import sys, os, string
import scipy as S
pygtk.require('2.0')
import gtk
#MPL.use('GTKAgg')
import pylab as P
from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as
NavigationToolbar



class Stuff:

    def reset(self, widget, data=None):
        self.ranges= S.array([])
        print self.ranges

    def delete_event(self, widget, event, data=None):
        print "delete event occurred"
        return False

    def destroy(self, widget, data=None):
        gtk.main_quit()

    def clickCanvas(self, widget, event):
        if event.button==1:
            self.ranges = S.append(self.ranges , event.x)
            print self.ranges

    def ZoneSetup(self):

        x=S.rand(10)
        y=S.rand(10)

        win = gtk.Window()
        win.connect("delete_event", self.delete_event)
        win.connect("destroy", self.destroy)
        win.set_default_size(600,450)

        vbox = gtk.VBox()
        hbox = gtk.HBox()
        win.add(vbox)

        fig = P.Figure(figsize=(5,4), dpi=100)
        ax = fig.add_subplot(111)
        ax.plot(x, y, c='red', ls='-')

        canvas = FigureCanvas(fig)
        vbox.pack_start(canvas)
        toolbar = NavigationToolbar(canvas, win)
        hbox.pack_start(toolbar)

        bReset = gtk.Button("Reset")
        bQuit  = gtk.Button("Quit")
        hbox.pack_start(bReset, False, False, 0)
        hbox.pack_start(bQuit,  False, False, 0)

        vbox.pack_start(hbox, False, False)

        bReset.connect ("clicked", self.reset)
        bQuit.connect_object("clicked", gtk.Widget.destroy, win)
        canvas.connect("button_press_event", self.clickCanvas)

        win.show_all()
        gtk.main()




    def __init__(self):

        self.ranges= S.array([])




a=Stuff()
a.ZoneSetup()
print a.ranges