up follow livre

venv/lib/python3.13/site-packages/fontTools/pens/perimeterPen.py

@@ -0,0 +1,69 @@
+# -*- coding: utf-8 -*-
+"""Calculate the perimeter of a glyph."""
+
+from fontTools.pens.basePen import BasePen
+from fontTools.misc.bezierTools import (
+    approximateQuadraticArcLengthC,
+    calcQuadraticArcLengthC,
+    approximateCubicArcLengthC,
+    calcCubicArcLengthC,
+)
+import math
+
+
+__all__ = ["PerimeterPen"]
+
+
+def _distance(p0, p1):
+    return math.hypot(p0[0] - p1[0], p0[1] - p1[1])
+
+
+class PerimeterPen(BasePen):
+    def __init__(self, glyphset=None, tolerance=0.005):
+        BasePen.__init__(self, glyphset)
+        self.value = 0
+        self.tolerance = tolerance
+
+        # Choose which algorithm to use for quadratic and for cubic.
+        # Quadrature is faster but has fixed error characteristic with no strong
+        # error bound.  The cutoff points are derived empirically.
+        self._addCubic = (
+            self._addCubicQuadrature if tolerance >= 0.0015 else self._addCubicRecursive
+        )
+        self._addQuadratic = (
+            self._addQuadraticQuadrature
+            if tolerance >= 0.00075
+            else self._addQuadraticExact
+        )
+
+    def _moveTo(self, p0):
+        self.__startPoint = p0
+
+    def _closePath(self):
+        p0 = self._getCurrentPoint()
+        if p0 != self.__startPoint:
+            self._lineTo(self.__startPoint)
+
+    def _lineTo(self, p1):
+        p0 = self._getCurrentPoint()
+        self.value += _distance(p0, p1)
+
+    def _addQuadraticExact(self, c0, c1, c2):
+        self.value += calcQuadraticArcLengthC(c0, c1, c2)
+
+    def _addQuadraticQuadrature(self, c0, c1, c2):
+        self.value += approximateQuadraticArcLengthC(c0, c1, c2)
+
+    def _qCurveToOne(self, p1, p2):
+        p0 = self._getCurrentPoint()
+        self._addQuadratic(complex(*p0), complex(*p1), complex(*p2))
+
+    def _addCubicRecursive(self, c0, c1, c2, c3):
+        self.value += calcCubicArcLengthC(c0, c1, c2, c3, self.tolerance)
+
+    def _addCubicQuadrature(self, c0, c1, c2, c3):
+        self.value += approximateCubicArcLengthC(c0, c1, c2, c3)
+
+    def _curveToOne(self, p1, p2, p3):
+        p0 = self._getCurrentPoint()
+        self._addCubic(complex(*p0), complex(*p1), complex(*p2), complex(*p3))