docs: def write_hw_scgink(hw, filename='mathbrush-test.txt'):
      """
      Parameters
      ----------
      hw : HandwrittenData object
      filename : string
          Path, where the SCG INK file gets written
      """
      with open(filename, 'w') as f:
          f.write('SCG_INK\n')
          f.write('%i\n' % len(hw.get_pointlist()))
          for stroke in hw.get_pointlist():
              f.write('%i\n' % len(stroke))
              for point in stroke:
                  f.write('%i %i\n' % (point['x'], point['y']))