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[statisticsPen] Avoid division-by-zero

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This commit is contained in:
Behdad Esfahbod 2022-08-12 14:00:27 -06:00
parent 2963fa503a
commit 52b28f9022
1 changed files with 5 additions and 2 deletions
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7
Lib/fontTools/pens/statisticsPen.py
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@ -61,10 +61,13 @@ class StatisticsPen(MomentsPen):
# Correlation(X,Y) = Covariance(X,Y) / ( stddev(X) * stddev(Y) )
# https://en.wikipedia.org/wiki/Pearson_product-moment_correlation_coefficient
correlation = covariance / (stddevX * stddevY)
if stddevX * stddevY == 0:
correlation = float("NaN")
else:
correlation = covariance / (stddevX * stddevY)
self.correlation = correlation if abs(correlation) > 1e-3 else 0
slant = covariance / varianceY
slant = covariance / varianceY if varianceY != 0 else float("NaN")
self.slant = slant if abs(slant) > 1e-3 else 0