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"""Pen recording operations that can be accessed or replayed."""
from fontTools.pens.basePen import AbstractPen, DecomposingPen
from fontTools.pens.pointPen import AbstractPointPen
__all__ = [
"replayRecording",
"RecordingPen",
"DecomposingRecordingPen",
"RecordingPointPen",
"lerpRecordings",
]
def replayRecording(recording, pen):
"""Replay a recording, as produced by RecordingPen or DecomposingRecordingPen,
to a pen.
Note that recording does not have to be produced by those pens.
It can be any iterable of tuples of method name and tuple-of-arguments.
Likewise, pen can be any objects receiving those method calls.
"""
for operator, operands in recording:
getattr(pen, operator)(*operands)
class RecordingPen(AbstractPen):
"""Pen recording operations that can be accessed or replayed.
The recording can be accessed as pen.value; or replayed using
pen.replay(otherPen).
:Example:
from fontTools.ttLib import TTFont
from fontTools.pens.recordingPen import RecordingPen
glyph_name = 'dollar'
font_path = 'MyFont.otf'
font = TTFont(font_path)
glyphset = font.getGlyphSet()
glyph = glyphset[glyph_name]
pen = RecordingPen()
glyph.draw(pen)
print(pen.value)
"""
def __init__(self):
self.value = []
def moveTo(self, p0):
self.value.append(("moveTo", (p0,)))
def lineTo(self, p1):
self.value.append(("lineTo", (p1,)))
def qCurveTo(self, *points):
self.value.append(("qCurveTo", points))
def curveTo(self, *points):
self.value.append(("curveTo", points))
def closePath(self):
self.value.append(("closePath", ()))
def endPath(self):
self.value.append(("endPath", ()))
def addComponent(self, glyphName, transformation):
self.value.append(("addComponent", (glyphName, transformation)))
def addVarComponent(self, glyphName, transformation, location):
self.value.append(("addVarComponent", (glyphName, transformation, location)))
def replay(self, pen):
replayRecording(self.value, pen)
draw = replay
class DecomposingRecordingPen(DecomposingPen, RecordingPen):
"""Same as RecordingPen, except that it doesn't keep components
as references, but draws them decomposed as regular contours.
The constructor takes a single 'glyphSet' positional argument,
a dictionary of glyph objects (i.e. with a 'draw' method) keyed
by thir name::
>>> class SimpleGlyph(object):
... def draw(self, pen):
... pen.moveTo((0, 0))
... pen.curveTo((1, 1), (2, 2), (3, 3))
... pen.closePath()
>>> class CompositeGlyph(object):
... def draw(self, pen):
... pen.addComponent('a', (1, 0, 0, 1, -1, 1))
>>> glyphSet = {'a': SimpleGlyph(), 'b': CompositeGlyph()}
>>> for name, glyph in sorted(glyphSet.items()):
... pen = DecomposingRecordingPen(glyphSet)
... glyph.draw(pen)
... print("{}: {}".format(name, pen.value))
a: [('moveTo', ((0, 0),)), ('curveTo', ((1, 1), (2, 2), (3, 3))), ('closePath', ())]
b: [('moveTo', ((-1, 1),)), ('curveTo', ((0, 2), (1, 3), (2, 4))), ('closePath', ())]
"""
# raises KeyError if base glyph is not found in glyphSet
skipMissingComponents = False
class RecordingPointPen(AbstractPointPen):
"""PointPen recording operations that can be accessed or replayed.
The recording can be accessed as pen.value; or replayed using
pointPen.replay(otherPointPen).
:Example:
from defcon import Font
from fontTools.pens.recordingPen import RecordingPointPen
glyph_name = 'a'
font_path = 'MyFont.ufo'
font = Font(font_path)
glyph = font[glyph_name]
pen = RecordingPointPen()
glyph.drawPoints(pen)
print(pen.value)
new_glyph = font.newGlyph('b')
pen.replay(new_glyph.getPointPen())
"""
def __init__(self):
self.value = []
def beginPath(self, identifier=None, **kwargs):
if identifier is not None:
kwargs["identifier"] = identifier
self.value.append(("beginPath", (), kwargs))
def endPath(self):
self.value.append(("endPath", (), {}))
def addPoint(
self, pt, segmentType=None, smooth=False, name=None, identifier=None, **kwargs
):
if identifier is not None:
kwargs["identifier"] = identifier
self.value.append(("addPoint", (pt, segmentType, smooth, name), kwargs))
def addComponent(self, baseGlyphName, transformation, identifier=None, **kwargs):
if identifier is not None:
kwargs["identifier"] = identifier
self.value.append(("addComponent", (baseGlyphName, transformation), kwargs))
def addVarComponent(
self, baseGlyphName, transformation, location, identifier=None, **kwargs
):
if identifier is not None:
kwargs["identifier"] = identifier
self.value.append(
("addVarComponent", (baseGlyphName, transformation, location), kwargs)
)
def replay(self, pointPen):
for operator, args, kwargs in self.value:
getattr(pointPen, operator)(*args, **kwargs)
drawPoints = replay
def lerpRecordings(recording1, recording2, factor=0.5):
"""Linearly interpolate between two recordings. The recordings
must be decomposed, i.e. they must not contain any components.
Factor is typically between 0 and 1. 0 means the first recording,
1 means the second recording, and 0.5 means the average of the
two recordings. Other values are possible, and can be useful to
extrapolate. Defaults to 0.5.
Returns a generator with the new recording.
"""
if len(recording1) != len(recording2):
raise ValueError(
"Mismatched lengths: %d and %d" % (len(recording1), len(recording2))
)
for (op1, args1), (op2, args2) in zip(recording1, recording2):
if op1 != op2:
raise ValueError("Mismatched operations: %s, %s" % (op1, op2))
if op1 == "addComponent":
raise ValueError("Cannot interpolate components")
else:
mid_args = [
(x1 + (x2 - x1) * factor, y1 + (y2 - y1) * factor)
for (x1, y1), (x2, y2) in zip(args1, args2)
]
yield (op1, mid_args)
if __name__ == "__main__":
pen = RecordingPen()
pen.moveTo((0, 0))
pen.lineTo((0, 100))
pen.curveTo((50, 75), (60, 50), (50, 25))
pen.closePath()
from pprint import pprint
pprint(pen.value)
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