[Matplotlib-users] moving marker line under mouse

[Sven D. <du...@as...>]

Hi,


I kind of got the basic functionality working using


      cid = self.fig.canvas.mpl_connect('motion_notify_event',
self.update_marker)


   def update_marker(self, event):
      print "plotMarker()"       # DEBUG
      self.marker=self.ax1
      
      #print 'button=%d, x=%d, y=%d, xdata=%f, ydata=%f'%(
      #   event.button, event.x, event.y, event.xdata, event.ydata)    
# DEBUG      
      
      self.ax1.axvline(x=event.xdata, linewidth=1, color='r')
      self.canvas.draw()  # redraw





but I still have the problem that previous lines still appear on the
plot.


Also, canvas.draw() seems to be a bit of a performance hog. Does anyone
have 
any more sophisticated solution to this?


Cheers,


Sven