"""Calculate the area of a glyph."""

from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.pens.basePen import BasePen
import math


def distance(p0, p1):
    return math.hypot(p0[0] - p1[0], p0[1] - p1[1])


def interpolate(p0, p1, t):
    return (p0[0] * (1 - t) + p1[0] * t, p0[1] * (1 - t) + p1[1] * t)


def polygon_area(p0, p1):
    return (p1[0] - p0[0]) * (p1[1] + p0[1]) * 0.5


def quadratic_curve_area(p0, p1, p2):
    new_p2 = interpolate(p2, p1, 2.0 / 3)
    new_p1 = interpolate(p0, p1, 2.0 / 3)
    return cubic_curve_area(p0, new_p1, new_p2, p2)


def cubic_curve_area(p0, p1, p2, p3):
    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
    return (
        x1 * (   -   y2 -   y3) +
        x2 * (y1        - 2*y3) +
        x3 * (y1 + 2*y2       )
    ) * 0.15


class AreaPen(BasePen):

    def __init__(self, glyphset):
        BasePen.__init__(self, glyphset)
        self.value = 0

    def _moveTo(self, p0):
        pass

    def _lineTo(self, p1):
        p0 = self._getCurrentPoint()
        self.value += polygon_area(p0, p1)

    def _curveToOne(self, p1, p2, p3):
        p0 = self._getCurrentPoint()
        self.value += cubic_curve_area(p0, p1, p2, p3)
        self.value += polygon_area(p0, p3)

    def _qCurveToOne(self, pt1, pt2):
        p0 = self._getCurrentPoint()
        self.value += quadratic_curve_area(p0, p1, p2)
        self.value += polygon_area(p0, p2)

"""Calculate the area of a glyph."""

from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.pens.basePen import BasePen


def interpolate(p0, p1, t):
    return (p0[0] * (1 - t) + p1[0] * t, p0[1] * (1 - t) + p1[1] * t)


def polygon_area(p0, p1):
    return (p1[0] - p0[0]) * (p1[1] + p0[1]) * 0.5


def quadratic_curve_area(p0, p1, p2):
    new_p2 = interpolate(p2, p1, 2.0 / 3)
    new_p1 = interpolate(p0, p1, 2.0 / 3)
    return cubic_curve_area(p0, new_p1, new_p2, p2)


def cubic_curve_area(p0, p1, p2, p3):
    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
    return (
        x1 * (   -   y2 -   y3) +
        x2 * (y1        - 2*y3) +
        x3 * (y1 + 2*y2       )
    ) * 0.15


class AreaPen(BasePen):

    def __init__(self, glyphset):
        BasePen.__init__(self, glyphset)
        self.value = 0

    def _moveTo(self, p0):
        pass

    def _lineTo(self, p1):
        p0 = self._getCurrentPoint()
        self.value += polygon_area(p0, p1)

    def _curveToOne(self, p1, p2, p3):
        p0 = self._getCurrentPoint()
        self.value += cubic_curve_area(p0, p1, p2, p3)
        self.value += polygon_area(p0, p3)

    def _qCurveToOne(self, pt1, pt2):
        p0 = self._getCurrentPoint()
        self.value += quadratic_curve_area(p0, p1, p2)
        self.value += polygon_area(p0, p2)

remove unused 'distance' function