from fontTools.pens.basePen import AbstractPen
__all__ = ["TransformPen"]
class TransformPen(AbstractPen):
"""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.
"""
if not hasattr(transformation, "transformPoint"):
from fontTools.misc.transform import Transform
transformation = Transform(*transformation)
self._transformation = transformation
self._transformPoint = transformation.transformPoint
self._outPen = outPen
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):
new = []
transformPoint = self._transformPoint
for pt in points:
new.append(transformPoint(pt))
return new
def closePath(self):
self._outPen.closePath()
def addComponent(self, glyphName, transformation):
transformation = self._transformation.transform(transformation)
self._outPen.addComponent(glyphName, transformation)
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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