code: def get_wcs(self, data_x, data_y):
          
          img = self.fitsimage.get_image()
          ra, dec = img.pixtoradec(data_x, data_y)
          return ra, dec
docs: Return (re_deg, dec_deg) for the (data_x, data_y) position
          based on any WCS associated with the loaded image.