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"""Calculate the area of a glyph."""
from fontTools.misc.py23 import *
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
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