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This commit is contained in:
James Godfrey-Kittle 2016-07-28 12:00:30 -07:00
parent 8dc57da4ae
commit 65befad036
1 changed files with 5 additions and 7 deletions
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12
Lib/cu2qu/__init__.py
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@ -143,8 +143,8 @@ def cubic_farthest_fit(p0, p1, p2, p3, tolerance):
def cubic_approx_spline(cubic, n, tolerance):
"""Approximate a cubic bezier curve with a spline of n quadratics.
Returns None if n is 1 and the cubic's control vectors are parallel, since
no quadratic exists with this cubic's tangents.
Returns None if no quadratic approximation is found at or below the
tolerance.
"""
if n == 1:
@ -193,8 +193,7 @@ def cubic_approx_spline(cubic, n, tolerance):
def curve_to_quadratic(curve, max_err):
"""Return a quadratic spline approximating this cubic bezier, and
the error of approximation.
"""Return a quadratic spline approximating this cubic bezier.
Raise 'ApproxNotFoundError' if no suitable approximation can be found
with the given parameters.
"""
@ -212,8 +211,7 @@ def curve_to_quadratic(curve, max_err):
def curves_to_quadratic(curves, max_errors):
"""Return quadratic splines approximating these cubic beziers, and
the respective errors of approximation.
"""Return quadratic splines approximating these cubic beziers.
Raise 'ApproxNotFoundError' if no suitable approximation can be found
for all curves with the given parameters.
"""
@ -228,7 +226,7 @@ def curves_to_quadratic(curves, max_errors):
if all(splines):
break
else:
# no break: raise if any spline is None or error exceeds tolerance
# no break: raise if any spline is None
for c, s in zip(curves, splines):
if s is None:
raise ApproxNotFoundError(c)