text: """Calculate the area of a glyph."""
  
  from fontTools.pens.basePen import BasePen
  
  
  __all__ = ["AreaPen"]
  
  
  class AreaPen(BasePen):
  
  	def __init__(self, glyphset=None):
  		BasePen.__init__(self, glyphset)
  		self.value = 0
  
  	def _moveTo(self, p0):
  		self._p0 = self._startPoint = p0
  
  	def _lineTo(self, p1):
  		x0, y0 = self._p0
  		x1, y1 = p1
  		self.value -= (x1 - x0) * (y1 + y0) * .5
  		self._p0 = p1
  
  	def _qCurveToOne(self, p1, p2):
  		# https://github.com/Pomax/bezierinfo/issues/44
  		p0 = self._p0
  		x0, y0 = p0[0], p0[1]
  		x1, y1 = p1[0] - x0, p1[1] - y0
  		x2, y2 = p2[0] - x0, p2[1] - y0
  		self.value -= (x2 * y1 - x1 * y2) / 3
  		self._lineTo(p2)
  		self._p0 = p2
  
  	def _curveToOne(self, p1, p2, p3):
  		# https://github.com/Pomax/bezierinfo/issues/44
  		p0 = self._p0
  		x0, y0 = p0[0], p0[1]
  		x1, y1 = p1[0] - x0, p1[1] - y0
  		x2, y2 = p2[0] - x0, p2[1] - y0
  		x3, y3 = p3[0] - x0, p3[1] - y0
  		self.value -= (
  				x1 * (   -   y2 -   y3) +
  				x2 * (y1        - 2*y3) +
  				x3 * (y1 + 2*y2       )
  			      ) * 0.15
  		self._lineTo(p3)
  		self._p0 = p3
  
  	def _closePath(self):
  		self._lineTo(self._startPoint)
  		del self._p0, self._startPoint
  
  	def _endPath(self):
  		if self._p0 != self._startPoint:
  			# Area is not defined for open contours.
  			raise NotImplementedError
  		del self._p0, self._startPoint
  