111 lines
3.9 KiB
Python
111 lines
3.9 KiB
Python
from fontTools.pens.filterPen import FilterPen, FilterPointPen
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__all__ = ["TransformPen", "TransformPointPen"]
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class TransformPen(FilterPen):
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"""Pen that transforms all coordinates using a Affine transformation,
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and passes them to another pen.
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"""
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def __init__(self, outPen, transformation):
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"""The 'outPen' argument is another pen object. It will receive the
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transformed coordinates. The 'transformation' argument can either
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be a six-tuple, or a fontTools.misc.transform.Transform object.
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"""
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super(TransformPen, self).__init__(outPen)
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if not hasattr(transformation, "transformPoint"):
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from fontTools.misc.transform import Transform
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transformation = Transform(*transformation)
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self._transformation = transformation
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self._transformPoint = transformation.transformPoint
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self._stack = []
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def moveTo(self, pt):
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self._outPen.moveTo(self._transformPoint(pt))
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def lineTo(self, pt):
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self._outPen.lineTo(self._transformPoint(pt))
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def curveTo(self, *points):
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self._outPen.curveTo(*self._transformPoints(points))
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def qCurveTo(self, *points):
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if points[-1] is None:
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points = self._transformPoints(points[:-1]) + [None]
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else:
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points = self._transformPoints(points)
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self._outPen.qCurveTo(*points)
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def _transformPoints(self, points):
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transformPoint = self._transformPoint
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return [transformPoint(pt) for pt in points]
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def closePath(self):
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self._outPen.closePath()
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def endPath(self):
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self._outPen.endPath()
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def addComponent(self, glyphName, transformation):
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transformation = self._transformation.transform(transformation)
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self._outPen.addComponent(glyphName, transformation)
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class TransformPointPen(FilterPointPen):
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"""PointPen that transforms all coordinates using a Affine transformation,
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and passes them to another PointPen.
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>>> from fontTools.pens.recordingPen import RecordingPointPen
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>>> rec = RecordingPointPen()
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>>> pen = TransformPointPen(rec, (2, 0, 0, 2, -10, 5))
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>>> v = iter(rec.value)
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>>> pen.beginPath(identifier="contour-0")
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>>> next(v)
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('beginPath', (), {'identifier': 'contour-0'})
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>>> pen.addPoint((100, 100), "line")
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>>> next(v)
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('addPoint', ((190, 205), 'line', False, None), {})
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>>> pen.endPath()
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>>> next(v)
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('endPath', (), {})
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>>> pen.addComponent("a", (1, 0, 0, 1, -10, 5), identifier="component-0")
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>>> next(v)
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('addComponent', ('a', <Transform [2 0 0 2 -30 15]>), {'identifier': 'component-0'})
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"""
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def __init__(self, outPointPen, transformation):
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"""The 'outPointPen' argument is another point pen object.
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It will receive the transformed coordinates.
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The 'transformation' argument can either be a six-tuple, or a
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fontTools.misc.transform.Transform object.
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"""
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super().__init__(outPointPen)
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if not hasattr(transformation, "transformPoint"):
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from fontTools.misc.transform import Transform
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transformation = Transform(*transformation)
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self._transformation = transformation
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self._transformPoint = transformation.transformPoint
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def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
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self._outPen.addPoint(
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self._transformPoint(pt), segmentType, smooth, name, **kwargs
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)
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def addComponent(self, baseGlyphName, transformation, **kwargs):
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transformation = self._transformation.transform(transformation)
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self._outPen.addComponent(baseGlyphName, transformation, **kwargs)
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if __name__ == "__main__":
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from fontTools.pens.basePen import _TestPen
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pen = TransformPen(_TestPen(None), (2, 0, 0.5, 2, -10, 0))
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pen.moveTo((0, 0))
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pen.lineTo((0, 100))
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pen.curveTo((50, 75), (60, 50), (50, 25), (0, 0))
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pen.closePath()
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