Qgis_MapGrid_SubScript_SupScript_values.py

"""
Trick comming from:
https://impermanent.io/2017/05/10/corner-utm-grid-labels-in-qgis-print-composer/
WARNING: Doesn't work for dynamic update of map production (Atlas)
"""

from qgis.utils import qgsfunction
from qgis.gui import *
 
@qgsfunction(args="auto", group='Custom')
def UTMMinorLabel(grid_ref, feature, parent):
 return "{:0.0f}".format(grid_ref)[-5:-3]
 
@qgsfunction(args="auto", group='Custom')
def UTMFullLabel(grid_ref, axis, feature, parent):
 gstring="{:0.0f}".format(grid_ref)
 rstr = gstring[-3:] #3 last characters
 mstr = gstring[-5:-3] #the 5th-4th characters
 #either the 1st or 1-2 for the most sig figs depending if there 6 or 7 digits
 lstr = ''
 if (len(gstring) == 6):
    lstr = gstring[0] #first 2 digits
 elif (len(gstring) == 7):
    lstr = gstring[0:1]
 else:
    return str(len(gstring))
 return "{0}{1}{2}m{3}".format(sub_scr_num(lstr),mstr,sub_scr_num(rstr),' E' if axis == 'x' else ' N')
 
def sub_scr_num(inputText):
 """ Converts any digits in the input text into their Unicode subscript equivalent.
 Expects a single string argument, returns a string"""
 subScr = (u'\u2080',u'\u2081',u'\u2082',u'\u2083',u'\u2084',u'\u2085',u'\u2086',u'\u2087',u'\u2088',u'\u2089')
 outputText = ''
 for char in inputText:
     charPos = ord(char) - 48
     if charPos not in range(10):
        outputText += char
     else:
        outputText += subScr[charPos]
 return outputText