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venv/Lib/site-packages/fontTools/pens/boundsPen.py

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+from fontTools.misc.arrayTools import updateBounds, pointInRect, unionRect
+from fontTools.misc.bezierTools import calcCubicBounds, calcQuadraticBounds
+from fontTools.pens.basePen import BasePen
+
+
+__all__ = ["BoundsPen", "ControlBoundsPen"]
+
+
+class ControlBoundsPen(BasePen):
+
+	"""Pen to calculate the "control bounds" of a shape. This is the
+	bounding box of all control points, so may be larger than the
+	actual bounding box if there are curves that don't have points
+	on their extremes.
+
+	When the shape has been drawn, the bounds are available as the
+	``bounds`` attribute of the pen object. It's a 4-tuple::
+
+		(xMin, yMin, xMax, yMax).
+
+	If ``ignoreSinglePoints`` is True, single points are ignored.
+	"""
+
+	def __init__(self, glyphSet, ignoreSinglePoints=False):
+		BasePen.__init__(self, glyphSet)
+		self.ignoreSinglePoints = ignoreSinglePoints
+		self.init()
+
+	def init(self):
+	    self.bounds = None
+	    self._start = None
+
+	def _moveTo(self, pt):
+		self._start = pt
+		if not self.ignoreSinglePoints:
+			self._addMoveTo()
+
+	def _addMoveTo(self):
+		if self._start is None:
+			return
+		bounds = self.bounds
+		if bounds:
+			self.bounds = updateBounds(bounds, self._start)
+		else:
+			x, y = self._start
+			self.bounds = (x, y, x, y)
+		self._start = None
+
+	def _lineTo(self, pt):
+		self._addMoveTo()
+		self.bounds = updateBounds(self.bounds, pt)
+
+	def _curveToOne(self, bcp1, bcp2, pt):
+		self._addMoveTo()
+		bounds = self.bounds
+		bounds = updateBounds(bounds, bcp1)
+		bounds = updateBounds(bounds, bcp2)
+		bounds = updateBounds(bounds, pt)
+		self.bounds = bounds
+
+	def _qCurveToOne(self, bcp, pt):
+		self._addMoveTo()
+		bounds = self.bounds
+		bounds = updateBounds(bounds, bcp)
+		bounds = updateBounds(bounds, pt)
+		self.bounds = bounds
+
+
+class BoundsPen(ControlBoundsPen):
+
+	"""Pen to calculate the bounds of a shape. It calculates the
+	correct bounds even when the shape contains curves that don't
+	have points on their extremes. This is somewhat slower to compute
+	than the "control bounds".
+
+	When the shape has been drawn, the bounds are available as the
+	``bounds`` attribute of the pen object. It's a 4-tuple::
+
+		(xMin, yMin, xMax, yMax)
+	"""
+
+	def _curveToOne(self, bcp1, bcp2, pt):
+		self._addMoveTo()
+		bounds = self.bounds
+		bounds = updateBounds(bounds, pt)
+		if not pointInRect(bcp1, bounds) or not pointInRect(bcp2, bounds):
+			bounds = unionRect(bounds, calcCubicBounds(
+					self._getCurrentPoint(), bcp1, bcp2, pt))
+		self.bounds = bounds
+
+	def _qCurveToOne(self, bcp, pt):
+		self._addMoveTo()
+		bounds = self.bounds
+		bounds = updateBounds(bounds, pt)
+		if not pointInRect(bcp, bounds):
+			bounds = unionRect(bounds, calcQuadraticBounds(
+					self._getCurrentPoint(), bcp, pt))
+		self.bounds = bounds