cu2quPen¶
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class
fontTools.pens.cu2quPen.
Cu2QuPen
(other_pen, max_err, reverse_direction=False, stats=None, ignore_single_points=False)[source]¶ A filter pen to convert cubic bezier curves to quadratic b-splines using the FontTools SegmentPen protocol.
other_pen: another SegmentPen used to draw the transformed outline. max_err: maximum approximation error in font units. For optimal results,
if you know the UPEM of the font, we recommend setting this to a value equal, or close to UPEM / 1000.
reverse_direction: flip the contours’ direction but keep starting point. stats: a dictionary counting the point numbers of quadratic segments. ignore_single_points: don’t emit contours containing only a single point
NOTE: The “ignore_single_points” argument is deprecated since v1.3.0, which dropped Robofab subpport. It’s no longer needed to special-case UFO2-style anchors (aka “named points”) when using ufoLib >= 2.0, as these are no longer drawn onto pens as single-point contours, but are handled separately as anchors.
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addComponent
(glyphName, transformation)[source]¶ Add a sub glyph. The ‘transformation’ argument must be a 6-tuple containing an affine transformation, or a Transform object from the fontTools.misc.transform module. More precisely: it should be a sequence containing 6 numbers.
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closePath
()[source]¶ Close the current sub path. You must call either pen.closePath() or pen.endPath() after each sub path.
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curveTo
(*points)[source]¶ Draw a cubic bezier with an arbitrary number of control points.
The last point specified is on-curve, all others are off-curve (control) points. If the number of control points is > 2, the segment is split into multiple bezier segments. This works like this:
Let n be the number of control points (which is the number of arguments to this call minus 1). If n==2, a plain vanilla cubic bezier is drawn. If n==1, we fall back to a quadratic segment and if n==0 we draw a straight line. It gets interesting when n>2: n-1 PostScript-style cubic segments will be drawn as if it were one curve. See decomposeSuperBezierSegment().
The conversion algorithm used for n>2 is inspired by NURB splines, and is conceptually equivalent to the TrueType “implied points” principle. See also decomposeQuadraticSegment().
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endPath
()[source]¶ End the current sub path, but don’t close it. You must call either pen.closePath() or pen.endPath() after each sub path.
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moveTo
(pt)[source]¶ Begin a new sub path, set the current point to ‘pt’. You must end each sub path with a call to pen.closePath() or pen.endPath().
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qCurveTo
(*points)[source]¶ Draw a whole string of quadratic curve segments.
The last point specified is on-curve, all others are off-curve points.
This method implements TrueType-style curves, breaking up curves using ‘implied points’: between each two consequtive off-curve points, there is one implied point exactly in the middle between them. See also decomposeQuadraticSegment().
The last argument (normally the on-curve point) may be None. This is to support contours that have NO on-curve points (a rarely seen feature of TrueType outlines).
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class
fontTools.pens.cu2quPen.
Cu2QuPointPen
(other_point_pen, max_err, reverse_direction=False, stats=None)[source]¶ A filter pen to convert cubic bezier curves to quadratic b-splines using the RoboFab PointPen protocol.
other_point_pen: another PointPen used to draw the transformed outline. max_err: maximum approximation error in font units. For optimal results,
if you know the UPEM of the font, we recommend setting this to a value equal, or close to UPEM / 1000.
reverse_direction: reverse the winding direction of all contours. stats: a dictionary counting the point numbers of quadratic segments.
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addPoint
(pt, segmentType=None, smooth=False, name=None, identifier=None, **kwargs)¶ Add a point to the current sub path.
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beginPath
(identifier=None, **kwargs)¶ Start a new sub path.
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endPath
()¶ End the current sub path.
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