39 lines
1.4 KiB
ReStructuredText
39 lines
1.4 KiB
ReStructuredText
########################################
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cu2qu: Convert cubic curves to quadratic
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########################################
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Routines for converting cubic curves to quadratic splines, suitable for use
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in OpenType to TrueType outline conversion.
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Conversion is carried out to a degree of tolerance provided by the user. While
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it is relatively easy to find the best *single* quadratic curve to represent a
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given cubic (see for example `this method from CAGD <https://www.sirver.net/blog/2011/08/23/degree-reduction-of-bezier-curves/>`_),
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the best-fit method may not be sufficiently accurate for type design.
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Instead, this method chops the cubic curve into multiple segments before
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converting each cubic segment to a quadratic, in order to ensure that the
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resulting spline fits within the given tolerance.
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The basic curve conversion routines are implemented in the
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:mod:`fontTools.cu2qu.cu2qu` module; the :mod:`fontTools.cu2qu.ufo` module
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applies these routines to all of the curves in a UFO file or files; while the
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:mod:`fontTools.cu2qu.cli` module implements the ``fonttools cu2qu`` command
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for converting a UFO format font with cubic curves into one with quadratic
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curves.
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fontTools.cu2qu.cu2qu
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---------------------
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.. automodule:: fontTools.cu2qu.cu2qu
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:inherited-members:
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:members:
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:undoc-members:
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fontTools.cu2qu.ufo
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-------------------
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.. automodule:: fontTools.cu2qu.ufo
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:inherited-members:
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:members:
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:undoc-members:
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