code: def _lineTo(self, p1):
      x0, y0 = self._p0
      x1, y1 = p1
      self.value -= (x1 - x0) * (y1 + y0) * 0.5
      self._p0 = p1
  
file_path: catboost/contrib/python/fonttools/fontTools/pens/areaPen.py
imports: from fontTools.pens.basePen import BasePen
label_desc: Use image node_id 3 for calling the AreaPen obj's underlying member method code with example usage: obj._lineTo(p1) without return types