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[qu2cu] Document new API

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This commit is contained in:
Behdad Esfahbod 2023-02-20 09:50:52 -07:00
parent efed2550be
commit f58a17d6e9
1 changed files with 31 additions and 0 deletions
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31
Lib/fontTools/qu2cu/qu2cu.py
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@ -165,6 +165,22 @@ def add_implicit_on_curves(p):
def quadratics_to_curves(pp, tolerance=0.5, all_cubic=False): def quadratics_to_curves(pp, tolerance=0.5, all_cubic=False):
"""Convers a connecting list of quadratic splines to a list of quadratic
and cubic curves.
A quadratic spline is specified as a list of points, each of which is
a 2-tuple of X,Y coordinates. The first and last points are on-curve points
and the rest are off-curve points, with an implied on-curve point in the
middle between every two consequtive off-curve points.
The output is a list of tuples. Each tuple is either of length three, for
a quadratic curve, or four, for a cubic curve. Each curve's last point
is the same as the next curve's first point.
q: quadratic splines
tolerance: absolute error tolerance; defaults to 0.5
all_cubic: if True, only cubic curves are generated; defaults to False
"""
is_complex = type(pp[0][0]) is complex is_complex = type(pp[0][0]) is complex
if not is_complex: if not is_complex:
pp = [[complex(x, y) for (x, y) in p] for p in pp] pp = [[complex(x, y) for (x, y) in p] for p in pp]
@ -192,6 +208,21 @@ def quadratics_to_curves(pp, tolerance=0.5, all_cubic=False):
def quadratic_to_curves(q, tolerance=0.5, all_cubic=False): def quadratic_to_curves(q, tolerance=0.5, all_cubic=False):
"""Convers a quadratic spline to a list of quadratic and cubic curves.
The quadratic spline is specified as a list of points, each of which is
a 2-tuple of X,Y coordinates. The first and last points are on-curve points
and the rest are off-curve points, with an implied on-curve point in the
middle between every two consequtive off-curve points.
The output is a list of tuples. Each tuple is either of length three, for
a quadratic curve, or four, for a cubic curve. Each curve's last point
is the same as the next curve's first point.
q: quadratic spline
tolerance: absolute error tolerance; defaults to 0.5
all_cubic: if True, only cubic curves are generated; defaults to False
"""
is_complex = type(q[0]) is complex is_complex = type(q[0]) is complex
if not is_complex: if not is_complex:
q = [complex(x, y) for (x, y) in q] q = [complex(x, y) for (x, y) in q]