code: def display_fence(self):
          '''display the fence'''
          from MAVProxy.modules.mavproxy_map import mp_slipmap
          self.fence_change_time = self.module('fence').fenceloader.last_change
          points = self.module('fence').fenceloader.polygon()
          self.mpstate.map.add_object(mp_slipmap.SlipClearLayer('Fence'))
          if len(points) > 1:
              popup = MPMenuSubMenu('Popup',
                                    items=[MPMenuItem('FencePoint Remove', returnkey='popupFenceRemove'),
                                           MPMenuItem('FencePoint Move', returnkey='popupFenceMove')])
              self.mpstate.map.add_object(mp_slipmap.SlipPolygon('Fence', points, layer=1,
                                                                 linewidth=2, colour=(0,255,0), popup_menu=popup)f display_fence(self):
          '''display the fence'''
          from MAVProxy.modules.mavproxy_map import mp_slipmap
          self.fence_change_time = self.module('fence').fenceloader.last_change
          points = self.module('fence').fenceloader.polygon()
          self.mpstate.map.add_object(mp_slipmap.SlipClearLayer('Fence'))
          if len(points) > 1:
              popup = MPMenuSubMenu('Popup',
                                    items=[MPMenuItem('FencePoint Remove', returnkey='popupFenceRemove'),
                                           MPMenuItem('FencePoint Move', returnkey='popupFenceMove')])
              self.mpstate.map.add_object(mp_slipmap.SlipPolygon('Fence', points, layer=1,
                                                                 linewidth=2, colour=(0,255,0), popup_menu=popup))
docs: display the fence