Permalink
Fetching contributors…
Cannot retrieve contributors at this time
102 lines (82 sloc) 3.12 KB
"""Pen recording operations that can be accessed or replayed."""
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.pens.basePen import AbstractPen, DecomposingPen
__all__ = ["replayRecording", "RecordingPen", "DecomposingRecordingPen"]
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).
Usage 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 replay(self, pen):
replayRecording(self.value, pen)
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
if __name__ == "__main__":
from fontTools.pens.basePen import _TestPen
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)