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- """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) * 0.5
- 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
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