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Ambulance Clerc
2022-03-04 18:47:24 +01:00
parent 2e92cb8cf4
commit aa5b7f9254
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1
venv/Lib/site-packages/fontTools/pens/__init__.py Normal file
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"""Empty __init__.py file to signal Python this directory is a package."""

57
venv/Lib/site-packages/fontTools/pens/areaPen.py Normal file
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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) * .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

408
venv/Lib/site-packages/fontTools/pens/basePen.py Normal file
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"""fontTools.pens.basePen.py -- Tools and base classes to build pen objects.
The Pen Protocol
A Pen is a kind of object that standardizes the way how to "draw" outlines:
it is a middle man between an outline and a drawing. In other words:
it is an abstraction for drawing outlines, making sure that outline objects
don't need to know the details about how and where they're being drawn, and
that drawings don't need to know the details of how outlines are stored.
The most basic pattern is this::
outline.draw(pen) # 'outline' draws itself onto 'pen'
Pens can be used to render outlines to the screen, but also to construct
new outlines. Eg. an outline object can be both a drawable object (it has a
draw() method) as well as a pen itself: you *build* an outline using pen
methods.
The AbstractPen class defines the Pen protocol. It implements almost
nothing (only no-op closePath() and endPath() methods), but is useful
for documentation purposes. Subclassing it basically tells the reader:
"this class implements the Pen protocol.". An examples of an AbstractPen
subclass is :py:class:`fontTools.pens.transformPen.TransformPen`.
The BasePen class is a base implementation useful for pens that actually
draw (for example a pen renders outlines using a native graphics engine).
BasePen contains a lot of base functionality, making it very easy to build
a pen that fully conforms to the pen protocol. Note that if you subclass
BasePen, you *don't* override moveTo(), lineTo(), etc., but _moveTo(),
_lineTo(), etc. See the BasePen doc string for details. Examples of
BasePen subclasses are fontTools.pens.boundsPen.BoundsPen and
fontTools.pens.cocoaPen.CocoaPen.
Coordinates are usually expressed as (x, y) tuples, but generally any
sequence of length 2 will do.
"""
from typing import Tuple
from fontTools.misc.loggingTools import LogMixin
__all__ = ["AbstractPen", "NullPen", "BasePen", "PenError",
"decomposeSuperBezierSegment", "decomposeQuadraticSegment"]
class PenError(Exception):
"""Represents an error during penning."""
class AbstractPen:
def moveTo(self, pt: Tuple[float, float]) -> None:
"""Begin a new sub path, set the current point to 'pt'. You must
end each sub path with a call to pen.closePath() or pen.endPath().
"""
raise NotImplementedError
def lineTo(self, pt: Tuple[float, float]) -> None:
"""Draw a straight line from the current point to 'pt'."""
raise NotImplementedError
def curveTo(self, *points: Tuple[float, float]) -> None:
"""Draw a cubic bezier with an arbitrary number of control points.
The last point specified is on-curve, all others are off-curve
(control) points. If the number of control points is > 2, the
segment is split into multiple bezier segments. This works
like this:
Let n be the number of control points (which is the number of
arguments to this call minus 1). If n==2, a plain vanilla cubic
bezier is drawn. If n==1, we fall back to a quadratic segment and
if n==0 we draw a straight line. It gets interesting when n>2:
n-1 PostScript-style cubic segments will be drawn as if it were
one curve. See decomposeSuperBezierSegment().
The conversion algorithm used for n>2 is inspired by NURB
splines, and is conceptually equivalent to the TrueType "implied
points" principle. See also decomposeQuadraticSegment().
"""
raise NotImplementedError
def qCurveTo(self, *points: Tuple[float, float]) -> None:
"""Draw a whole string of quadratic curve segments.
The last point specified is on-curve, all others are off-curve
points.
This method implements TrueType-style curves, breaking up curves
using 'implied points': between each two consequtive off-curve points,
there is one implied point exactly in the middle between them. See
also decomposeQuadraticSegment().
The last argument (normally the on-curve point) may be None.
This is to support contours that have NO on-curve points (a rarely
seen feature of TrueType outlines).
"""
raise NotImplementedError
def closePath(self) -> None:
"""Close the current sub path. You must call either pen.closePath()
or pen.endPath() after each sub path.
"""
pass
def endPath(self) -> None:
"""End the current sub path, but don't close it. You must call
either pen.closePath() or pen.endPath() after each sub path.
"""
pass
def addComponent(
self,
glyphName: str,
transformation: Tuple[float, float, float, float, float, float]
) -> None:
"""Add a sub glyph. The 'transformation' argument must be a 6-tuple
containing an affine transformation, or a Transform object from the
fontTools.misc.transform module. More precisely: it should be a
sequence containing 6 numbers.
"""
raise NotImplementedError
class NullPen(AbstractPen):
"""A pen that does nothing.
"""
def moveTo(self, pt):
pass
def lineTo(self, pt):
pass
def curveTo(self, *points):
pass
def qCurveTo(self, *points):
pass
def closePath(self):
pass
def endPath(self):
pass
def addComponent(self, glyphName, transformation):
pass
class LoggingPen(LogMixin, AbstractPen):
"""A pen with a ``log`` property (see fontTools.misc.loggingTools.LogMixin)
"""
pass
class MissingComponentError(KeyError):
"""Indicates a component pointing to a non-existent glyph in the glyphset."""
class DecomposingPen(LoggingPen):
""" Implements a 'addComponent' method that decomposes components
(i.e. draws them onto self as simple contours).
It can also be used as a mixin class (e.g. see ContourRecordingPen).
You must override moveTo, lineTo, curveTo and qCurveTo. You may
additionally override closePath, endPath and addComponent.
By default a warning message is logged when a base glyph is missing;
set the class variable ``skipMissingComponents`` to False if you want
to raise a :class:`MissingComponentError` exception.
"""
skipMissingComponents = True
def __init__(self, glyphSet):
""" Takes a single 'glyphSet' argument (dict), in which the glyphs
that are referenced as components are looked up by their name.
"""
super(DecomposingPen, self).__init__()
self.glyphSet = glyphSet
def addComponent(self, glyphName, transformation):
""" Transform the points of the base glyph and draw it onto self.
"""
from fontTools.pens.transformPen import TransformPen
try:
glyph = self.glyphSet[glyphName]
except KeyError:
if not self.skipMissingComponents:
raise MissingComponentError(glyphName)
self.log.warning(
"glyph '%s' is missing from glyphSet; skipped" % glyphName)
else:
tPen = TransformPen(self, transformation)
glyph.draw(tPen)
class BasePen(DecomposingPen):
"""Base class for drawing pens. You must override _moveTo, _lineTo and
_curveToOne. You may additionally override _closePath, _endPath,
addComponent and/or _qCurveToOne. You should not override any other
methods.
"""
def __init__(self, glyphSet=None):
super(BasePen, self).__init__(glyphSet)
self.__currentPoint = None
# must override
def _moveTo(self, pt):
raise NotImplementedError
def _lineTo(self, pt):
raise NotImplementedError
def _curveToOne(self, pt1, pt2, pt3):
raise NotImplementedError
# may override
def _closePath(self):
pass
def _endPath(self):
pass
def _qCurveToOne(self, pt1, pt2):
"""This method implements the basic quadratic curve type. The
default implementation delegates the work to the cubic curve
function. Optionally override with a native implementation.
"""
pt0x, pt0y = self.__currentPoint
pt1x, pt1y = pt1
pt2x, pt2y = pt2
mid1x = pt0x + 0.66666666666666667 * (pt1x - pt0x)
mid1y = pt0y + 0.66666666666666667 * (pt1y - pt0y)
mid2x = pt2x + 0.66666666666666667 * (pt1x - pt2x)
mid2y = pt2y + 0.66666666666666667 * (pt1y - pt2y)
self._curveToOne((mid1x, mid1y), (mid2x, mid2y), pt2)
# don't override
def _getCurrentPoint(self):
"""Return the current point. This is not part of the public
interface, yet is useful for subclasses.
"""
return self.__currentPoint
def closePath(self):
self._closePath()
self.__currentPoint = None
def endPath(self):
self._endPath()
self.__currentPoint = None
def moveTo(self, pt):
self._moveTo(pt)
self.__currentPoint = pt
def lineTo(self, pt):
self._lineTo(pt)
self.__currentPoint = pt
def curveTo(self, *points):
n = len(points) - 1 # 'n' is the number of control points
assert n >= 0
if n == 2:
# The common case, we have exactly two BCP's, so this is a standard
# cubic bezier. Even though decomposeSuperBezierSegment() handles
# this case just fine, we special-case it anyway since it's so
# common.
self._curveToOne(*points)
self.__currentPoint = points[-1]
elif n > 2:
# n is the number of control points; split curve into n-1 cubic
# bezier segments. The algorithm used here is inspired by NURB
# splines and the TrueType "implied point" principle, and ensures
# the smoothest possible connection between two curve segments,
# with no disruption in the curvature. It is practical since it
# allows one to construct multiple bezier segments with a much
# smaller amount of points.
_curveToOne = self._curveToOne
for pt1, pt2, pt3 in decomposeSuperBezierSegment(points):
_curveToOne(pt1, pt2, pt3)
self.__currentPoint = pt3
elif n == 1:
self.qCurveTo(*points)
elif n == 0:
self.lineTo(points[0])
else:
raise AssertionError("can't get there from here")
def qCurveTo(self, *points):
n = len(points) - 1 # 'n' is the number of control points
assert n >= 0
if points[-1] is None:
# Special case for TrueType quadratics: it is possible to
# define a contour with NO on-curve points. BasePen supports
# this by allowing the final argument (the expected on-curve
# point) to be None. We simulate the feature by making the implied
# on-curve point between the last and the first off-curve points
# explicit.
x, y = points[-2] # last off-curve point
nx, ny = points[0] # first off-curve point
impliedStartPoint = (0.5 * (x + nx), 0.5 * (y + ny))
self.__currentPoint = impliedStartPoint
self._moveTo(impliedStartPoint)
points = points[:-1] + (impliedStartPoint,)
if n > 0:
# Split the string of points into discrete quadratic curve
# segments. Between any two consecutive off-curve points
# there's an implied on-curve point exactly in the middle.
# This is where the segment splits.
_qCurveToOne = self._qCurveToOne
for pt1, pt2 in decomposeQuadraticSegment(points):
_qCurveToOne(pt1, pt2)
self.__currentPoint = pt2
else:
self.lineTo(points[0])
def decomposeSuperBezierSegment(points):
"""Split the SuperBezier described by 'points' into a list of regular
bezier segments. The 'points' argument must be a sequence with length
3 or greater, containing (x, y) coordinates. The last point is the
destination on-curve point, the rest of the points are off-curve points.
The start point should not be supplied.
This function returns a list of (pt1, pt2, pt3) tuples, which each
specify a regular curveto-style bezier segment.
"""
n = len(points) - 1
assert n > 1
bezierSegments = []
pt1, pt2, pt3 = points[0], None, None
for i in range(2, n+1):
# calculate points in between control points.
nDivisions = min(i, 3, n-i+2)
for j in range(1, nDivisions):
factor = j / nDivisions
temp1 = points[i-1]
temp2 = points[i-2]
temp = (temp2[0] + factor * (temp1[0] - temp2[0]),
temp2[1] + factor * (temp1[1] - temp2[1]))
if pt2 is None:
pt2 = temp
else:
pt3 = (0.5 * (pt2[0] + temp[0]),
0.5 * (pt2[1] + temp[1]))
bezierSegments.append((pt1, pt2, pt3))
pt1, pt2, pt3 = temp, None, None
bezierSegments.append((pt1, points[-2], points[-1]))
return bezierSegments
def decomposeQuadraticSegment(points):
"""Split the quadratic curve segment described by 'points' into a list
of "atomic" quadratic segments. The 'points' argument must be a sequence
with length 2 or greater, containing (x, y) coordinates. The last point
is the destination on-curve point, the rest of the points are off-curve
points. The start point should not be supplied.
This function returns a list of (pt1, pt2) tuples, which each specify a
plain quadratic bezier segment.
"""
n = len(points) - 1
assert n > 0
quadSegments = []
for i in range(n - 1):
x, y = points[i]
nx, ny = points[i+1]
impliedPt = (0.5 * (x + nx), 0.5 * (y + ny))
quadSegments.append((points[i], impliedPt))
quadSegments.append((points[-2], points[-1]))
return quadSegments
class _TestPen(BasePen):
"""Test class that prints PostScript to stdout."""
def _moveTo(self, pt):
print("%s %s moveto" % (pt[0], pt[1]))
def _lineTo(self, pt):
print("%s %s lineto" % (pt[0], pt[1]))
def _curveToOne(self, bcp1, bcp2, pt):
print("%s %s %s %s %s %s curveto" % (bcp1[0], bcp1[1],
bcp2[0], bcp2[1], pt[0], pt[1]))
def _closePath(self):
print("closepath")
if __name__ == "__main__":
pen = _TestPen(None)
pen.moveTo((0, 0))
pen.lineTo((0, 100))
pen.curveTo((50, 75), (60, 50), (50, 25), (0, 0))
pen.closePath()
pen = _TestPen(None)
# testing the "no on-curve point" scenario
pen.qCurveTo((0, 0), (0, 100), (100, 100), (100, 0), None)
pen.closePath()

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

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venv/Lib/site-packages/fontTools/pens/cocoaPen.py Normal file
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from fontTools.pens.basePen import BasePen
__all__ = ["CocoaPen"]
class CocoaPen(BasePen):
def __init__(self, glyphSet, path=None):
BasePen.__init__(self, glyphSet)
if path is None:
from AppKit import NSBezierPath
path = NSBezierPath.bezierPath()
self.path = path
def _moveTo(self, p):
self.path.moveToPoint_(p)
def _lineTo(self, p):
self.path.lineToPoint_(p)
def _curveToOne(self, p1, p2, p3):
self.path.curveToPoint_controlPoint1_controlPoint2_(p3, p1, p2)
def _closePath(self):
self.path.closePath()

260
venv/Lib/site-packages/fontTools/pens/cu2quPen.py Normal file
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# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from fontTools.cu2qu import curve_to_quadratic
from fontTools.pens.basePen import AbstractPen, decomposeSuperBezierSegment
from fontTools.pens.reverseContourPen import ReverseContourPen
from fontTools.pens.pointPen import BasePointToSegmentPen
from fontTools.pens.pointPen import ReverseContourPointPen
class Cu2QuPen(AbstractPen):
""" A filter pen to convert cubic bezier curves to quadratic b-splines
using the FontTools SegmentPen protocol.
Args:
other_pen: another SegmentPen used to draw the transformed outline.
max_err: maximum approximation error in font units. For optimal results,
if you know the UPEM of the font, we recommend setting this to a
value equal, or close to UPEM / 1000.
reverse_direction: flip the contours' direction but keep starting point.
stats: a dictionary counting the point numbers of quadratic segments.
ignore_single_points: don't emit contours containing only a single point
NOTE: The "ignore_single_points" argument is deprecated since v1.3.0,
which dropped Robofab subpport. It's no longer needed to special-case
UFO2-style anchors (aka "named points") when using ufoLib >= 2.0,
as these are no longer drawn onto pens as single-point contours,
but are handled separately as anchors.
"""
def __init__(self, other_pen, max_err, reverse_direction=False,
stats=None, ignore_single_points=False):
if reverse_direction:
self.pen = ReverseContourPen(other_pen)
else:
self.pen = other_pen
self.max_err = max_err
self.stats = stats
if ignore_single_points:
import warnings
warnings.warn("ignore_single_points is deprecated and "
"will be removed in future versions",
UserWarning, stacklevel=2)
self.ignore_single_points = ignore_single_points
self.start_pt = None
self.current_pt = None
def _check_contour_is_open(self):
if self.current_pt is None:
raise AssertionError("moveTo is required")
def _check_contour_is_closed(self):
if self.current_pt is not None:
raise AssertionError("closePath or endPath is required")
def _add_moveTo(self):
if self.start_pt is not None:
self.pen.moveTo(self.start_pt)
self.start_pt = None
def moveTo(self, pt):
self._check_contour_is_closed()
self.start_pt = self.current_pt = pt
if not self.ignore_single_points:
self._add_moveTo()
def lineTo(self, pt):
self._check_contour_is_open()
self._add_moveTo()
self.pen.lineTo(pt)
self.current_pt = pt
def qCurveTo(self, *points):
self._check_contour_is_open()
n = len(points)
if n == 1:
self.lineTo(points[0])
elif n > 1:
self._add_moveTo()
self.pen.qCurveTo(*points)
self.current_pt = points[-1]
else:
raise AssertionError("illegal qcurve segment point count: %d" % n)
def _curve_to_quadratic(self, pt1, pt2, pt3):
curve = (self.current_pt, pt1, pt2, pt3)
quadratic = curve_to_quadratic(curve, self.max_err)
if self.stats is not None:
n = str(len(quadratic) - 2)
self.stats[n] = self.stats.get(n, 0) + 1
self.qCurveTo(*quadratic[1:])
def curveTo(self, *points):
self._check_contour_is_open()
n = len(points)
if n == 3:
# this is the most common case, so we special-case it
self._curve_to_quadratic(*points)
elif n > 3:
for segment in decomposeSuperBezierSegment(points):
self._curve_to_quadratic(*segment)
elif n == 2:
self.qCurveTo(*points)
elif n == 1:
self.lineTo(points[0])
else:
raise AssertionError("illegal curve segment point count: %d" % n)
def closePath(self):
self._check_contour_is_open()
if self.start_pt is None:
# if 'start_pt' is _not_ None, we are ignoring single-point paths
self.pen.closePath()
self.current_pt = self.start_pt = None
def endPath(self):
self._check_contour_is_open()
if self.start_pt is None:
self.pen.endPath()
self.current_pt = self.start_pt = None
def addComponent(self, glyphName, transformation):
self._check_contour_is_closed()
self.pen.addComponent(glyphName, transformation)
class Cu2QuPointPen(BasePointToSegmentPen):
""" A filter pen to convert cubic bezier curves to quadratic b-splines
using the RoboFab PointPen protocol.
Args:
other_point_pen: another PointPen used to draw the transformed outline.
max_err: maximum approximation error in font units. For optimal results,
if you know the UPEM of the font, we recommend setting this to a
value equal, or close to UPEM / 1000.
reverse_direction: reverse the winding direction of all contours.
stats: a dictionary counting the point numbers of quadratic segments.
"""
def __init__(self, other_point_pen, max_err, reverse_direction=False,
stats=None):
BasePointToSegmentPen.__init__(self)
if reverse_direction:
self.pen = ReverseContourPointPen(other_point_pen)
else:
self.pen = other_point_pen
self.max_err = max_err
self.stats = stats
def _flushContour(self, segments):
assert len(segments) >= 1
closed = segments[0][0] != "move"
new_segments = []
prev_points = segments[-1][1]
prev_on_curve = prev_points[-1][0]
for segment_type, points in segments:
if segment_type == 'curve':
for sub_points in self._split_super_bezier_segments(points):
on_curve, smooth, name, kwargs = sub_points[-1]
bcp1, bcp2 = sub_points[0][0], sub_points[1][0]
cubic = [prev_on_curve, bcp1, bcp2, on_curve]
quad = curve_to_quadratic(cubic, self.max_err)
if self.stats is not None:
n = str(len(quad) - 2)
self.stats[n] = self.stats.get(n, 0) + 1
new_points = [(pt, False, None, {}) for pt in quad[1:-1]]
new_points.append((on_curve, smooth, name, kwargs))
new_segments.append(["qcurve", new_points])
prev_on_curve = sub_points[-1][0]
else:
new_segments.append([segment_type, points])
prev_on_curve = points[-1][0]
if closed:
# the BasePointToSegmentPen.endPath method that calls _flushContour
# rotates the point list of closed contours so that they end with
# the first on-curve point. We restore the original starting point.
new_segments = new_segments[-1:] + new_segments[:-1]
self._drawPoints(new_segments)
def _split_super_bezier_segments(self, points):
sub_segments = []
# n is the number of control points
n = len(points) - 1
if n == 2:
# a simple bezier curve segment
sub_segments.append(points)
elif n > 2:
# a "super" bezier; decompose it
on_curve, smooth, name, kwargs = points[-1]
num_sub_segments = n - 1
for i, sub_points in enumerate(decomposeSuperBezierSegment([
pt for pt, _, _, _ in points])):
new_segment = []
for point in sub_points[:-1]:
new_segment.append((point, False, None, {}))
if i == (num_sub_segments - 1):
# the last on-curve keeps its original attributes
new_segment.append((on_curve, smooth, name, kwargs))
else:
# on-curves of sub-segments are always "smooth"
new_segment.append((sub_points[-1], True, None, {}))
sub_segments.append(new_segment)
else:
raise AssertionError(
"expected 2 control points, found: %d" % n)
return sub_segments
def _drawPoints(self, segments):
pen = self.pen
pen.beginPath()
last_offcurves = []
for i, (segment_type, points) in enumerate(segments):
if segment_type in ("move", "line"):
assert len(points) == 1, (
"illegal line segment point count: %d" % len(points))
pt, smooth, name, kwargs = points[0]
pen.addPoint(pt, segment_type, smooth, name, **kwargs)
elif segment_type == "qcurve":
assert len(points) >= 2, (
"illegal qcurve segment point count: %d" % len(points))
offcurves = points[:-1]
if offcurves:
if i == 0:
# any off-curve points preceding the first on-curve
# will be appended at the end of the contour
last_offcurves = offcurves
else:
for (pt, smooth, name, kwargs) in offcurves:
pen.addPoint(pt, None, smooth, name, **kwargs)
pt, smooth, name, kwargs = points[-1]
if pt is None:
# special quadratic contour with no on-curve points:
# we need to skip the "None" point. See also the Pen
# protocol's qCurveTo() method and fontTools.pens.basePen
pass
else:
pen.addPoint(pt, segment_type, smooth, name, **kwargs)
else:
# 'curve' segments must have been converted to 'qcurve' by now
raise AssertionError(
"unexpected segment type: %r" % segment_type)
for (pt, smooth, name, kwargs) in last_offcurves:
pen.addPoint(pt, None, smooth, name, **kwargs)
pen.endPath()
def addComponent(self, baseGlyphName, transformation):
assert self.currentPath is None
self.pen.addComponent(baseGlyphName, transformation)

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from fontTools.pens.basePen import AbstractPen
from fontTools.pens.pointPen import AbstractPointPen
from fontTools.pens.recordingPen import RecordingPen
class _PassThruComponentsMixin(object):
def addComponent(self, glyphName, transformation, **kwargs):
self._outPen.addComponent(glyphName, transformation, **kwargs)
class FilterPen(_PassThruComponentsMixin, AbstractPen):
""" Base class for pens that apply some transformation to the coordinates
they receive and pass them to another pen.
You can override any of its methods. The default implementation does
nothing, but passes the commands unmodified to the other pen.
>>> from fontTools.pens.recordingPen import RecordingPen
>>> rec = RecordingPen()
>>> pen = FilterPen(rec)
>>> v = iter(rec.value)
>>> pen.moveTo((0, 0))
>>> next(v)
('moveTo', ((0, 0),))
>>> pen.lineTo((1, 1))
>>> next(v)
('lineTo', ((1, 1),))
>>> pen.curveTo((2, 2), (3, 3), (4, 4))
>>> next(v)
('curveTo', ((2, 2), (3, 3), (4, 4)))
>>> pen.qCurveTo((5, 5), (6, 6), (7, 7), (8, 8))
>>> next(v)
('qCurveTo', ((5, 5), (6, 6), (7, 7), (8, 8)))
>>> pen.closePath()
>>> next(v)
('closePath', ())
>>> pen.moveTo((9, 9))
>>> next(v)
('moveTo', ((9, 9),))
>>> pen.endPath()
>>> next(v)
('endPath', ())
>>> pen.addComponent('foo', (1, 0, 0, 1, 0, 0))
>>> next(v)
('addComponent', ('foo', (1, 0, 0, 1, 0, 0)))
"""
def __init__(self, outPen):
self._outPen = outPen
def moveTo(self, pt):
self._outPen.moveTo(pt)
def lineTo(self, pt):
self._outPen.lineTo(pt)
def curveTo(self, *points):
self._outPen.curveTo(*points)
def qCurveTo(self, *points):
self._outPen.qCurveTo(*points)
def closePath(self):
self._outPen.closePath()
def endPath(self):
self._outPen.endPath()
class ContourFilterPen(_PassThruComponentsMixin, RecordingPen):
"""A "buffered" filter pen that accumulates contour data, passes
it through a ``filterContour`` method when the contour is closed or ended,
and finally draws the result with the output pen.
Components are passed through unchanged.
"""
def __init__(self, outPen):
super(ContourFilterPen, self).__init__()
self._outPen = outPen
def closePath(self):
super(ContourFilterPen, self).closePath()
self._flushContour()
def endPath(self):
super(ContourFilterPen, self).endPath()
self._flushContour()
def _flushContour(self):
result = self.filterContour(self.value)
if result is not None:
self.value = result
self.replay(self._outPen)
self.value = []
def filterContour(self, contour):
"""Subclasses must override this to perform the filtering.
The contour is a list of pen (operator, operands) tuples.
Operators are strings corresponding to the AbstractPen methods:
"moveTo", "lineTo", "curveTo", "qCurveTo", "closePath" and
"endPath". The operands are the positional arguments that are
passed to each method.
If the method doesn't return a value (i.e. returns None), it's
assumed that the argument was modified in-place.
Otherwise, the return value is drawn with the output pen.
"""
return # or return contour
class FilterPointPen(_PassThruComponentsMixin, AbstractPointPen):
""" Baseclass for point pens that apply some transformation to the
coordinates they receive and pass them to another point pen.
You can override any of its methods. The default implementation does
nothing, but passes the commands unmodified to the other pen.
>>> from fontTools.pens.recordingPen import RecordingPointPen
>>> rec = RecordingPointPen()
>>> pen = FilterPointPen(rec)
>>> v = iter(rec.value)
>>> pen.beginPath(identifier="abc")
>>> next(v)
('beginPath', (), {'identifier': 'abc'})
>>> pen.addPoint((1, 2), "line", False)
>>> next(v)
('addPoint', ((1, 2), 'line', False, None), {})
>>> pen.addComponent("a", (2, 0, 0, 2, 10, -10), identifier="0001")
>>> next(v)
('addComponent', ('a', (2, 0, 0, 2, 10, -10)), {'identifier': '0001'})
>>> pen.endPath()
>>> next(v)
('endPath', (), {})
"""
def __init__(self, outPointPen):
self._outPen = outPointPen
def beginPath(self, **kwargs):
self._outPen.beginPath(**kwargs)
def endPath(self):
self._outPen.endPath()
def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
self._outPen.addPoint(pt, segmentType, smooth, name, **kwargs)

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"""
=========
PointPens
=========
Where **SegmentPens** have an intuitive approach to drawing
(if you're familiar with postscript anyway), the **PointPen**
is geared towards accessing all the data in the contours of
the glyph. A PointPen has a very simple interface, it just
steps through all the points in a call from glyph.drawPoints().
This allows the caller to provide more data for each point.
For instance, whether or not a point is smooth, and its name.
"""
import math
from typing import Any, Optional, Tuple
from fontTools.pens.basePen import AbstractPen, PenError
__all__ = [
"AbstractPointPen",
"BasePointToSegmentPen",
"PointToSegmentPen",
"SegmentToPointPen",
"GuessSmoothPointPen",
"ReverseContourPointPen",
]
class AbstractPointPen:
"""Baseclass for all PointPens."""
def beginPath(self, identifier: Optional[str] = None, **kwargs: Any) -> None:
"""Start a new sub path."""
raise NotImplementedError
def endPath(self) -> None:
"""End the current sub path."""
raise NotImplementedError
def addPoint(
self,
pt: Tuple[float, float],
segmentType: Optional[str] = None,
smooth: bool = False,
name: Optional[str] = None,
identifier: Optional[str] = None,
**kwargs: Any
) -> None:
"""Add a point to the current sub path."""
raise NotImplementedError
def addComponent(
self,
baseGlyphName: str,
transformation: Tuple[float, float, float, float, float, float],
identifier: Optional[str] = None,
**kwargs: Any
) -> None:
"""Add a sub glyph."""
raise NotImplementedError
class BasePointToSegmentPen(AbstractPointPen):
"""
Base class for retrieving the outline in a segment-oriented
way. The PointPen protocol is simple yet also a little tricky,
so when you need an outline presented as segments but you have
as points, do use this base implementation as it properly takes
care of all the edge cases.
"""
def __init__(self):
self.currentPath = None
def beginPath(self, identifier=None, **kwargs):
if self.currentPath is not None:
raise PenError("Path already begun.")
self.currentPath = []
def _flushContour(self, segments):
"""Override this method.
It will be called for each non-empty sub path with a list
of segments: the 'segments' argument.
The segments list contains tuples of length 2:
(segmentType, points)
segmentType is one of "move", "line", "curve" or "qcurve".
"move" may only occur as the first segment, and it signifies
an OPEN path. A CLOSED path does NOT start with a "move", in
fact it will not contain a "move" at ALL.
The 'points' field in the 2-tuple is a list of point info
tuples. The list has 1 or more items, a point tuple has
four items:
(point, smooth, name, kwargs)
'point' is an (x, y) coordinate pair.
For a closed path, the initial moveTo point is defined as
the last point of the last segment.
The 'points' list of "move" and "line" segments always contains
exactly one point tuple.
"""
raise NotImplementedError
def endPath(self):
if self.currentPath is None:
raise PenError("Path not begun.")
points = self.currentPath
self.currentPath = None
if not points:
return
if len(points) == 1:
# Not much more we can do than output a single move segment.
pt, segmentType, smooth, name, kwargs = points[0]
segments = [("move", [(pt, smooth, name, kwargs)])]
self._flushContour(segments)
return
segments = []
if points[0][1] == "move":
# It's an open contour, insert a "move" segment for the first
# point and remove that first point from the point list.
pt, segmentType, smooth, name, kwargs = points[0]
segments.append(("move", [(pt, smooth, name, kwargs)]))
points.pop(0)
else:
# It's a closed contour. Locate the first on-curve point, and
# rotate the point list so that it _ends_ with an on-curve
# point.
firstOnCurve = None
for i in range(len(points)):
segmentType = points[i][1]
if segmentType is not None:
firstOnCurve = i
break
if firstOnCurve is None:
# Special case for quadratics: a contour with no on-curve
# points. Add a "None" point. (See also the Pen protocol's
# qCurveTo() method and fontTools.pens.basePen.py.)
points.append((None, "qcurve", None, None, None))
else:
points = points[firstOnCurve+1:] + points[:firstOnCurve+1]
currentSegment = []
for pt, segmentType, smooth, name, kwargs in points:
currentSegment.append((pt, smooth, name, kwargs))
if segmentType is None:
continue
segments.append((segmentType, currentSegment))
currentSegment = []
self._flushContour(segments)
def addPoint(self, pt, segmentType=None, smooth=False, name=None,
identifier=None, **kwargs):
if self.currentPath is None:
raise PenError("Path not begun")
self.currentPath.append((pt, segmentType, smooth, name, kwargs))
class PointToSegmentPen(BasePointToSegmentPen):
"""
Adapter class that converts the PointPen protocol to the
(Segment)Pen protocol.
NOTE: The segment pen does not support and will drop point names, identifiers
and kwargs.
"""
def __init__(self, segmentPen, outputImpliedClosingLine=False):
BasePointToSegmentPen.__init__(self)
self.pen = segmentPen
self.outputImpliedClosingLine = outputImpliedClosingLine
def _flushContour(self, segments):
if not segments:
raise PenError("Must have at least one segment.")
pen = self.pen
if segments[0][0] == "move":
# It's an open path.
closed = False
points = segments[0][1]
if len(points) != 1:
raise PenError(f"Illegal move segment point count: {len(points)}")
movePt, _, _ , _ = points[0]
del segments[0]
else:
# It's a closed path, do a moveTo to the last
# point of the last segment.
closed = True
segmentType, points = segments[-1]
movePt, _, _ , _ = points[-1]
if movePt is None:
# quad special case: a contour with no on-curve points contains
# one "qcurve" segment that ends with a point that's None. We
# must not output a moveTo() in that case.
pass
else:
pen.moveTo(movePt)
outputImpliedClosingLine = self.outputImpliedClosingLine
nSegments = len(segments)
lastPt = movePt
for i in range(nSegments):
segmentType, points = segments[i]
points = [pt for pt, _, _ , _ in points]
if segmentType == "line":
if len(points) != 1:
raise PenError(f"Illegal line segment point count: {len(points)}")
pt = points[0]
# For closed contours, a 'lineTo' is always implied from the last oncurve
# point to the starting point, thus we can omit it when the last and
# starting point don't overlap.
# However, when the last oncurve point is a "line" segment and has same
# coordinates as the starting point of a closed contour, we need to output
# the closing 'lineTo' explicitly (regardless of the value of the
# 'outputImpliedClosingLine' option) in order to disambiguate this case from
# the implied closing 'lineTo', otherwise the duplicate point would be lost.
# See https://github.com/googlefonts/fontmake/issues/572.
if (
i + 1 != nSegments
or outputImpliedClosingLine
or not closed
or pt == lastPt
):
pen.lineTo(pt)
lastPt = pt
elif segmentType == "curve":
pen.curveTo(*points)
lastPt = points[-1]
elif segmentType == "qcurve":
pen.qCurveTo(*points)
lastPt = points[-1]
else:
raise PenError(f"Illegal segmentType: {segmentType}")
if closed:
pen.closePath()
else:
pen.endPath()
def addComponent(self, glyphName, transform, identifier=None, **kwargs):
del identifier # unused
del kwargs # unused
self.pen.addComponent(glyphName, transform)
class SegmentToPointPen(AbstractPen):
"""
Adapter class that converts the (Segment)Pen protocol to the
PointPen protocol.
"""
def __init__(self, pointPen, guessSmooth=True):
if guessSmooth:
self.pen = GuessSmoothPointPen(pointPen)
else:
self.pen = pointPen
self.contour = None
def _flushContour(self):
pen = self.pen
pen.beginPath()
for pt, segmentType in self.contour:
pen.addPoint(pt, segmentType=segmentType)
pen.endPath()
def moveTo(self, pt):
self.contour = []
self.contour.append((pt, "move"))
def lineTo(self, pt):
if self.contour is None:
raise PenError("Contour missing required initial moveTo")
self.contour.append((pt, "line"))
def curveTo(self, *pts):
if not pts:
raise TypeError("Must pass in at least one point")
if self.contour is None:
raise PenError("Contour missing required initial moveTo")
for pt in pts[:-1]:
self.contour.append((pt, None))
self.contour.append((pts[-1], "curve"))
def qCurveTo(self, *pts):
if not pts:
raise TypeError("Must pass in at least one point")
if pts[-1] is None:
self.contour = []
else:
if self.contour is None:
raise PenError("Contour missing required initial moveTo")
for pt in pts[:-1]:
self.contour.append((pt, None))
if pts[-1] is not None:
self.contour.append((pts[-1], "qcurve"))
def closePath(self):
if self.contour is None:
raise PenError("Contour missing required initial moveTo")
if len(self.contour) > 1 and self.contour[0][0] == self.contour[-1][0]:
self.contour[0] = self.contour[-1]
del self.contour[-1]
else:
# There's an implied line at the end, replace "move" with "line"
# for the first point
pt, tp = self.contour[0]
if tp == "move":
self.contour[0] = pt, "line"
self._flushContour()
self.contour = None
def endPath(self):
if self.contour is None:
raise PenError("Contour missing required initial moveTo")
self._flushContour()
self.contour = None
def addComponent(self, glyphName, transform):
if self.contour is not None:
raise PenError("Components must be added before or after contours")
self.pen.addComponent(glyphName, transform)
class GuessSmoothPointPen(AbstractPointPen):
"""
Filtering PointPen that tries to determine whether an on-curve point
should be "smooth", ie. that it's a "tangent" point or a "curve" point.
"""
def __init__(self, outPen, error=0.05):
self._outPen = outPen
self._error = error
self._points = None
def _flushContour(self):
if self._points is None:
raise PenError("Path not begun")
points = self._points
nPoints = len(points)
if not nPoints:
return
if points[0][1] == "move":
# Open path.
indices = range(1, nPoints - 1)
elif nPoints > 1:
# Closed path. To avoid having to mod the contour index, we
# simply abuse Python's negative index feature, and start at -1
indices = range(-1, nPoints - 1)
else:
# closed path containing 1 point (!), ignore.
indices = []
for i in indices:
pt, segmentType, _, name, kwargs = points[i]
if segmentType is None:
continue
prev = i - 1
next = i + 1
if points[prev][1] is not None and points[next][1] is not None:
continue
# At least one of our neighbors is an off-curve point
pt = points[i][0]
prevPt = points[prev][0]
nextPt = points[next][0]
if pt != prevPt and pt != nextPt:
dx1, dy1 = pt[0] - prevPt[0], pt[1] - prevPt[1]
dx2, dy2 = nextPt[0] - pt[0], nextPt[1] - pt[1]
a1 = math.atan2(dy1, dx1)
a2 = math.atan2(dy2, dx2)
if abs(a1 - a2) < self._error:
points[i] = pt, segmentType, True, name, kwargs
for pt, segmentType, smooth, name, kwargs in points:
self._outPen.addPoint(pt, segmentType, smooth, name, **kwargs)
def beginPath(self, identifier=None, **kwargs):
if self._points is not None:
raise PenError("Path already begun")
self._points = []
if identifier is not None:
kwargs["identifier"] = identifier
self._outPen.beginPath(**kwargs)
def endPath(self):
self._flushContour()
self._outPen.endPath()
self._points = None
def addPoint(self, pt, segmentType=None, smooth=False, name=None,
identifier=None, **kwargs):
if self._points is None:
raise PenError("Path not begun")
if identifier is not None:
kwargs["identifier"] = identifier
self._points.append((pt, segmentType, False, name, kwargs))
def addComponent(self, glyphName, transformation, identifier=None, **kwargs):
if self._points is not None:
raise PenError("Components must be added before or after contours")
if identifier is not None:
kwargs["identifier"] = identifier
self._outPen.addComponent(glyphName, transformation, **kwargs)
class ReverseContourPointPen(AbstractPointPen):
"""
This is a PointPen that passes outline data to another PointPen, but
reversing the winding direction of all contours. Components are simply
passed through unchanged.
Closed contours are reversed in such a way that the first point remains
the first point.
"""
def __init__(self, outputPointPen):
self.pen = outputPointPen
# a place to store the points for the current sub path
self.currentContour = None
def _flushContour(self):
pen = self.pen
contour = self.currentContour
if not contour:
pen.beginPath(identifier=self.currentContourIdentifier)
pen.endPath()
return
closed = contour[0][1] != "move"
if not closed:
lastSegmentType = "move"
else:
# Remove the first point and insert it at the end. When
# the list of points gets reversed, this point will then
# again be at the start. In other words, the following
# will hold:
# for N in range(len(originalContour)):
# originalContour[N] == reversedContour[-N]
contour.append(contour.pop(0))
# Find the first on-curve point.
firstOnCurve = None
for i in range(len(contour)):
if contour[i][1] is not None:
firstOnCurve = i
break
if firstOnCurve is None:
# There are no on-curve points, be basically have to
# do nothing but contour.reverse().
lastSegmentType = None
else:
lastSegmentType = contour[firstOnCurve][1]
contour.reverse()
if not closed:
# Open paths must start with a move, so we simply dump
# all off-curve points leading up to the first on-curve.
while contour[0][1] is None:
contour.pop(0)
pen.beginPath(identifier=self.currentContourIdentifier)
for pt, nextSegmentType, smooth, name, kwargs in contour:
if nextSegmentType is not None:
segmentType = lastSegmentType
lastSegmentType = nextSegmentType
else:
segmentType = None
pen.addPoint(pt, segmentType=segmentType, smooth=smooth, name=name, **kwargs)
pen.endPath()
def beginPath(self, identifier=None, **kwargs):
if self.currentContour is not None:
raise PenError("Path already begun")
self.currentContour = []
self.currentContourIdentifier = identifier
self.onCurve = []
def endPath(self):
if self.currentContour is None:
raise PenError("Path not begun")
self._flushContour()
self.currentContour = None
def addPoint(self, pt, segmentType=None, smooth=False, name=None, identifier=None, **kwargs):
if self.currentContour is None:
raise PenError("Path not begun")
if identifier is not None:
kwargs["identifier"] = identifier
self.currentContour.append((pt, segmentType, smooth, name, kwargs))
def addComponent(self, glyphName, transform, identifier=None, **kwargs):
if self.currentContour is not None:
raise PenError("Components must be added before or after contours")
self.pen.addComponent(glyphName, transform, identifier=identifier, **kwargs)

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venv/Lib/site-packages/fontTools/pens/quartzPen.py Normal file
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from fontTools.pens.basePen import BasePen
from Quartz.CoreGraphics import CGPathCreateMutable, CGPathMoveToPoint
from Quartz.CoreGraphics import CGPathAddLineToPoint, CGPathAddCurveToPoint
from Quartz.CoreGraphics import CGPathAddQuadCurveToPoint, CGPathCloseSubpath
__all__ = ["QuartzPen"]
class QuartzPen(BasePen):
"""A pen that creates a CGPath
Parameters
- path: an optional CGPath to add to
- xform: an optional CGAffineTransform to apply to the path
"""
def __init__(self, glyphSet, path=None, xform=None):
BasePen.__init__(self, glyphSet)
if path is None:
path = CGPathCreateMutable()
self.path = path
self.xform = xform
def _moveTo(self, pt):
x, y = pt
CGPathMoveToPoint(self.path, self.xform, x, y)
def _lineTo(self, pt):
x, y = pt
CGPathAddLineToPoint(self.path, self.xform, x, y)
def _curveToOne(self, p1, p2, p3):
(x1, y1), (x2, y2), (x3, y3) = p1, p2, p3
CGPathAddCurveToPoint(self.path, self.xform, x1, y1, x2, y2, x3, y3)
def _qCurveToOne(self, p1, p2):
(x1, y1), (x2, y2) = p1, p2
CGPathAddQuadCurveToPoint(self.path, self.xform, x1, y1, x2, y2)
def _closePath(self):
CGPathCloseSubpath(self.path)

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# Copyright (c) 2009 Type Supply LLC
# Author: Tal Leming
from fontTools.misc.roundTools import otRound, roundFunc
from fontTools.misc.psCharStrings import T2CharString
from fontTools.pens.basePen import BasePen
from fontTools.cffLib.specializer import specializeCommands, commandsToProgram
class T2CharStringPen(BasePen):
"""Pen to draw Type 2 CharStrings.
The 'roundTolerance' argument controls the rounding of point coordinates.
It is defined as the maximum absolute difference between the original
float and the rounded integer value.
The default tolerance of 0.5 means that all floats are rounded to integer;
a value of 0 disables rounding; values in between will only round floats
which are close to their integral part within the tolerated range.
"""
def __init__(self, width, glyphSet, roundTolerance=0.5, CFF2=False):
super(T2CharStringPen, self).__init__(glyphSet)
self.round = roundFunc(roundTolerance)
self._CFF2 = CFF2
self._width = width
self._commands = []
self._p0 = (0,0)
def _p(self, pt):
p0 = self._p0
pt = self._p0 = (self.round(pt[0]), self.round(pt[1]))
return [pt[0]-p0[0], pt[1]-p0[1]]
def _moveTo(self, pt):
self._commands.append(('rmoveto', self._p(pt)))
def _lineTo(self, pt):
self._commands.append(('rlineto', self._p(pt)))
def _curveToOne(self, pt1, pt2, pt3):
_p = self._p
self._commands.append(('rrcurveto', _p(pt1)+_p(pt2)+_p(pt3)))
def _closePath(self):
pass
def _endPath(self):
pass
def getCharString(self, private=None, globalSubrs=None, optimize=True):
commands = self._commands
if optimize:
maxstack = 48 if not self._CFF2 else 513
commands = specializeCommands(commands,
generalizeFirst=False,
maxstack=maxstack)
program = commandsToProgram(commands)
if self._width is not None:
assert not self._CFF2, "CFF2 does not allow encoding glyph width in CharString."
program.insert(0, otRound(self._width))
if not self._CFF2:
program.append('endchar')
charString = T2CharString(
program=program, private=private, globalSubrs=globalSubrs)
return charString