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