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import math
from fontTools.pens.basePen import AbstractPen
from robofab.pens.pointPen import AbstractPointPen, BasePointToSegmentPen
class FabToFontToolsPenAdapter:
"""Class that covers up the subtle differences between RoboFab
Pens and FontTools Pens. 'Fab should eventually move to FontTools
Pens, this class may help to make the transition smoother.
"""
# XXX The change to FontTools pens has almost been completed. Any
# usage of this class should be highly suspect.
def __init__(self, fontToolsPen):
self.fontToolsPen = fontToolsPen
def moveTo(self, pt, **kargs):
self.fontToolsPen.moveTo(pt)
def lineTo(self, pt, **kargs):
self.fontToolsPen.lineTo(pt)
def curveTo(self, *pts, **kargs):
self.fontToolsPen.curveTo(*pts)
def qCurveTo(self, *pts, **kargs):
self.fontToolsPen.qCurveTo(*pts)
def closePath(self):
self.fontToolsPen.closePath()
def endPath(self):
self.fontToolsPen.endPath()
def addComponent(self, glyphName, offset=(0, 0), scale=(1, 1)):
self.fontToolsPen.addComponent(glyphName,
(scale[0], 0, 0, scale[1], offset[0], offset[1]))
def setWidth(self, width):
self.width = width
def setNote(self, note):
pass
def addAnchor(self, name, pt):
self.fontToolsPen.moveTo(pt)
self.fontToolsPen.endPath()
def doneDrawing(self):
pass
class PointToSegmentPen(BasePointToSegmentPen):
"""Adapter class that converts the PointPen protocol to the
(Segment)Pen protocol.
"""
def __init__(self, segmentPen, outputImpliedClosingLine=False):
BasePointToSegmentPen.__init__(self)
self.pen = segmentPen
self.outputImpliedClosingLine = outputImpliedClosingLine
def _flushContour(self, segments):
assert len(segments) >= 1
pen = self.pen
if segments[0][0] == "move":
# It's an open path.
closed = False
points = segments[0][1]
assert len(points) == 1
movePt, smooth, name, kwargs = 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, smooth, name, kwargs = 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)
for i in range(nSegments):
segmentType, points = segments[i]
points = [pt for pt, smooth, name, kwargs in points]
if segmentType == "line":
assert len(points) == 1
pt = points[0]
if i + 1 != nSegments or outputImpliedClosingLine or not closed:
pen.lineTo(pt)
elif segmentType == "curve":
pen.curveTo(*points)
elif segmentType == "qcurve":
pen.qCurveTo(*points)
else:
assert 0, "illegal segmentType: %s" % segmentType
if closed:
pen.closePath()
else:
pen.endPath()
def addComponent(self, glyphName, transform):
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):
self.contour.append((pt, "line"))
def curveTo(self, *pts):
for pt in pts[:-1]:
self.contour.append((pt, None))
self.contour.append((pts[-1], "curve"))
def qCurveTo(self, *pts):
if pts[-1] is None:
self.contour = []
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 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):
self._flushContour()
self.contour = None
def addComponent(self, glyphName, transform):
assert self.contour is None
self.pen.addComponent(glyphName, transform)
class TransformPointPen(AbstractPointPen):
"""PointPen that transforms all coordinates, and passes them to another
PointPen. It also transforms the transformation given to addComponent().
"""
def __init__(self, outPen, transformation):
if not hasattr(transformation, "transformPoint"):
from fontTools.misc.transform import Transform
transformation = Transform(*transformation)
self._transformation = transformation
self._transformPoint = transformation.transformPoint
self._outPen = outPen
self._stack = []
def beginPath(self):
self._outPen.beginPath()
def endPath(self):
self._outPen.endPath()
def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
pt = self._transformPoint(pt)
self._outPen.addPoint(pt, segmentType, smooth, name, **kwargs)
def addComponent(self, glyphName, transformation):
transformation = self._transformation.transform(transformation)
self._outPen.addComponent(glyphName, transformation)
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):
self._outPen = outPen
self._points = None
def _flushContour(self):
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, dummy, 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(dx1, dy1)
a2 = math.atan2(dx2, dy2)
if abs(a1 - a2) < 0.05:
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):
assert self._points is None
self._points = []
self._outPen.beginPath()
def endPath(self):
self._flushContour()
self._outPen.endPath()
self._points = None
def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
self._points.append((pt, segmentType, False, name, kwargs))
def addComponent(self, glyphName, transformation):
assert self._points is None
self._outPen.addComponent(glyphName, transformation)
if __name__ == "__main__":
from fontTools.pens.basePen import _TestPen as PSPen
from robofab.pens.pointPen import PrintingPointPen
segmentPen = PSPen(None)
# pen = PointToSegmentPen(SegmentToPointPen(PointToSegmentPen(PSPen(None))))
pen = PointToSegmentPen(SegmentToPointPen(PrintingPointPen()))
# pen = PrintingPointPen()
pen = PointToSegmentPen(PSPen(None), outputImpliedClosingLine=False)
# pen.beginPath()
# pen.addPoint((50, 50), name="an anchor")
# pen.endPath()
pen.beginPath()
pen.addPoint((-100, 0), segmentType="line")
pen.addPoint((0, 0), segmentType="line")
pen.addPoint((0, 100), segmentType="line")
pen.addPoint((30, 200))
pen.addPoint((50, 100), name="superbezcontrolpoint!")
pen.addPoint((70, 200))
pen.addPoint((100, 100), segmentType="curve")
pen.addPoint((100, 0), segmentType="line")
pen.endPath()
# pen.addComponent("a", (1, 0, 0, 1, 100, 200))
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