for text in _render_characters(event_record.line, height, cell_width):
    g.add(text)

# Define this line or reuse the existing definition
g_str = g.tostring()
if g_str in definitions:
    group_id = definitions[g_str]
else:
    group_id = len(definitions) + 1
    assert group_id not in definitions
    definitions[g_str] = group_id
    g.attribs['id'] = group_id
    dwg.defs.add(g)