qt - Drawing a matplotlib figure without drawing the lines -

i've embedded matplotlib figure in qt (using pyside bindings), , using draw function redraw figure:

self.canvas.figure.draw() 

i'm panning , zooming figure, , have been using draw method show new perspectives zooming in (using set_xlim , set_ylim) , panning (drag_pan , start_pan). there way redraw figure, ignore redrawing newly plotted points? when pans, i'm making new plots using blit, want make sure isn't being redone during draw method , running efficiently possible

edit/update: below code snippet of how i'm panning (inspired code navigationaltoolbar):

    def on_drag(self, event):     x, y = event.x, event.y        if event.button == 1 , not event.dblclick , self.zoom.zoom_level != 0:          self._button_pressed = 1         self.cursor.dragging_enabled = true           self._xypress = []          i, in enumerate(self.canvas.figure.get_axes()):              if (x not none , y not none): # , a.in_axes(event)):                  a.start_pan(x, y, event.button)                 self._xypress.append((a))                 self._iddrag = self.canvas.mpl_connect('motion_notify_event',                                                    self.drag_pan)    def drag_pan(self,event):      self.canvas.update()     self.canvas.flush_events()        x, y = self.calculate_center_coords()     self.pan_center_x = x       self.pan_center_y = y        in self._xypress:          a.drag_pan(self._button_pressed, event.key, event.x, event.y)         x_diff = self.pan_center_x / event.xdata         y_diff = self.pan_center_y / event.ydata          if self.zoom.zoom_level == 1:             if ((x_diff > 1.04590 , x_diff < 1.05090) or                                (x_diff < 0.95715 , x_diff > 0.95215) or                                (y_diff > 1.03550 , y_diff < 1.04450) or                               (y_diff < 0.97215 , y_diff > 0.96115)):                   x, y = self.calculate_center_coords()                 self.pan_center_x = x                   self.pan_center_y = y                    #method replots points using blit                 self.panning()      #redraws canvas, bottleneck     self.canvas.draw()