docs: def move_pointing(self, event):
          """Grab nearest pointing to event.x,event.y and with cursor"""
  
          (ra, dec) = self.c2p((self.canvasx(event.x),
                                self.canvasy(event.y)))
          closest = None
          this_pointing = None
          this_index = -1
          index = -1
          for pointing in self.pointings:
              index = index + 1
              # Find the camera we clicked closest too
              ds = pointing["camera"].separation(ra, dec)
              if this_pointing is None or ds < closest:
                  this_index = index
                  closest = ds
                  this_pointing = pointing
          if this_pointing is None:
              return
          self.plabel.set(this_pointing['label']['text'])
          this_pointing["camera"].set_coord((ra*units.radian, dec*units.radian))
          ccds = numpy.radians(this_pointing["camera"].geometry)
          items = this_pointing["items"]
          label = this_pointing["label"]
          (x1, y1) = self.p2c((this_pointing["camera"].ra.radian, this_pointing["camera"].dec.radian))
          self.coords(label["id"], x1, y1)
          for i in range(len(ccds)):
              ccd = ccds[i]
              item = items[i]
              if len(ccd) == 4:
                  (x1, y1) = self.p2c((ccd[0], ccd[1]))
                  (x2, y2) = self.p2c((ccd[2], ccd[3]))
              else:
                  (x1, y1) = self.p2c((ccd[0] - ccd[2]), ccd[1] - ccd[2])
                  (x2, y2) = self.p2c((ccd[0] + ccd[2]), ccd[1] + ccd[2])
              self.coords(item, x1, y1, x2, y2)
          self.current_pointing(this_index)