code: def cmd_zoom(self, args):
          '''control zoom'''
          if len(args) < 2:
              print("map zoom WIDTH(m)")
              return
          ground_width = float(args[1])
          self.map.set_zoom(ground_widthf cmd_zoom(self, args):
          '''control zoom'''
          if len(args) < 2:
              print("map zoom WIDTH(m)")
              return
          ground_width = float(args[1])
          self.map.set_zoom(ground_width)
docs: control zoom