131 lines
4.5 KiB
Python
131 lines
4.5 KiB
Python
from fontTools.misc.roundTools import noRound, otRound
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from fontTools.misc.transform import Transform
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from fontTools.pens.filterPen import FilterPen, FilterPointPen
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__all__ = ["RoundingPen", "RoundingPointPen"]
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class RoundingPen(FilterPen):
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"""
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Filter pen that rounds point coordinates and component XY offsets to integer. For
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rounding the component transform values, a separate round function can be passed to
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the pen.
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>>> from fontTools.pens.recordingPen import RecordingPen
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>>> recpen = RecordingPen()
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>>> roundpen = RoundingPen(recpen)
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>>> roundpen.moveTo((0.4, 0.6))
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>>> roundpen.lineTo((1.6, 2.5))
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>>> roundpen.qCurveTo((2.4, 4.6), (3.3, 5.7), (4.9, 6.1))
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>>> roundpen.curveTo((6.4, 8.6), (7.3, 9.7), (8.9, 10.1))
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>>> roundpen.addComponent("a", (1.5, 0, 0, 1.5, 10.5, -10.5))
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>>> recpen.value == [
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... ('moveTo', ((0, 1),)),
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... ('lineTo', ((2, 3),)),
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... ('qCurveTo', ((2, 5), (3, 6), (5, 6))),
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... ('curveTo', ((6, 9), (7, 10), (9, 10))),
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... ('addComponent', ('a', (1.5, 0, 0, 1.5, 11, -10))),
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... ]
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True
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"""
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def __init__(self, outPen, roundFunc=otRound, transformRoundFunc=noRound):
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super().__init__(outPen)
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self.roundFunc = roundFunc
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self.transformRoundFunc = transformRoundFunc
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def moveTo(self, pt):
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self._outPen.moveTo((self.roundFunc(pt[0]), self.roundFunc(pt[1])))
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def lineTo(self, pt):
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self._outPen.lineTo((self.roundFunc(pt[0]), self.roundFunc(pt[1])))
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def curveTo(self, *points):
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self._outPen.curveTo(
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*((self.roundFunc(x), self.roundFunc(y)) for x, y in points)
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)
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def qCurveTo(self, *points):
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self._outPen.qCurveTo(
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*((self.roundFunc(x), self.roundFunc(y)) for x, y in points)
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)
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def addComponent(self, glyphName, transformation):
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xx, xy, yx, yy, dx, dy = transformation
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self._outPen.addComponent(
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glyphName,
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Transform(
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self.transformRoundFunc(xx),
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self.transformRoundFunc(xy),
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self.transformRoundFunc(yx),
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self.transformRoundFunc(yy),
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self.roundFunc(dx),
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self.roundFunc(dy),
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),
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)
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class RoundingPointPen(FilterPointPen):
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"""
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Filter point pen that rounds point coordinates and component XY offsets to integer.
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For rounding the component scale values, a separate round function can be passed to
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the pen.
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>>> from fontTools.pens.recordingPen import RecordingPointPen
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>>> recpen = RecordingPointPen()
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>>> roundpen = RoundingPointPen(recpen)
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>>> roundpen.beginPath()
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>>> roundpen.addPoint((0.4, 0.6), 'line')
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>>> roundpen.addPoint((1.6, 2.5), 'line')
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>>> roundpen.addPoint((2.4, 4.6))
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>>> roundpen.addPoint((3.3, 5.7))
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>>> roundpen.addPoint((4.9, 6.1), 'qcurve')
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>>> roundpen.endPath()
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>>> roundpen.addComponent("a", (1.5, 0, 0, 1.5, 10.5, -10.5))
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>>> recpen.value == [
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... ('beginPath', (), {}),
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... ('addPoint', ((0, 1), 'line', False, None), {}),
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... ('addPoint', ((2, 3), 'line', False, None), {}),
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... ('addPoint', ((2, 5), None, False, None), {}),
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... ('addPoint', ((3, 6), None, False, None), {}),
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... ('addPoint', ((5, 6), 'qcurve', False, None), {}),
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... ('endPath', (), {}),
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... ('addComponent', ('a', (1.5, 0, 0, 1.5, 11, -10)), {}),
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... ]
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True
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"""
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def __init__(self, outPen, roundFunc=otRound, transformRoundFunc=noRound):
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super().__init__(outPen)
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self.roundFunc = roundFunc
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self.transformRoundFunc = transformRoundFunc
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def addPoint(
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self, pt, segmentType=None, smooth=False, name=None, identifier=None, **kwargs
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):
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self._outPen.addPoint(
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(self.roundFunc(pt[0]), self.roundFunc(pt[1])),
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segmentType=segmentType,
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smooth=smooth,
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name=name,
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identifier=identifier,
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**kwargs,
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)
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def addComponent(self, baseGlyphName, transformation, identifier=None, **kwargs):
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xx, xy, yx, yy, dx, dy = transformation
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self._outPen.addComponent(
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baseGlyphName=baseGlyphName,
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transformation=Transform(
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self.transformRoundFunc(xx),
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self.transformRoundFunc(xy),
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self.transformRoundFunc(yx),
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self.transformRoundFunc(yy),
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self.roundFunc(dx),
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self.roundFunc(dy),
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),
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identifier=identifier,
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**kwargs,
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)
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