matplotlib-users Mailing List for matplotlib

Hi,
In the example below I can make the cursor snap over the
nearest point with the mouse and also move the cursor with the
keyboard.
But I can't print the coordinates in the toolbar when the I
move the cursor with the keyboard as when I move with the mouse!
Does anyone have an idea?
Cheers,
Alexandre
from pylab import *
import numpy
from matplotlib.widgets import Cursor
class DataCursor(Cursor):
 def __init__(self, t, y, ax, useblit=True, **lineprops):
 Cursor.__init__(self, ax, useblit=True, **lineprops)
 self.y = y
 self.t = t
 self.i = 0
 self.xstr = ''
 self.ystr = ''
 def onmove(self, event):
 """
 we override event.xdata to force it to snap-to nearest data item
 """
 N = len(self.y)
 # Mouse Move
 if event.name=="motion_notify_event":
 xdata = event.xdata
 ind = numpy.searchsorted(self.t, xdata)
 self.i = min(N-1, ind)
 # Key press
 elif event.name=="key_press_event":
 if event.key=="right":
 self.i+=1
 while self.i>=N:
 self.i-=N
 elif event.key=="left":
 self.i-=1
 while self.i<0:
 self.i+=N
 # Set the cursor and draw
 event.xdata = self.t[self.i]
 event.ydata = self.y[self.i]
 self.xstr = '%1.3f'%event.xdata
 self.ystr = '%1.3f'%event.ydata
 Cursor.onmove(self, event)
 def fmtx(self, x):
 return self.xstr
 def fmty(self, y):
 return self.ystr
t = numpy.cumsum(numpy.random.rand(20))
y = numpy.random.rand(len(t))
fig = figure()
ax = fig.add_subplot(111)
ax.plot(t, y, 'go')
cursor = DataCursor(t, y, ax, useblit=True, color='red', linewidth=2 )
ax.fmt_xdata = cursor.fmtx
ax.fmt_ydata = cursor.fmty
fig.canvas.mpl_connect('key_press_event', cursor.onmove )
show()