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A trig. improvement TODO I left by the wayside; Decimal seems very unhelpful here. :/

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Johan Sundström 2011-02-21 03:01:05 -08:00
parent 5f18a23fd7
commit 338e56f1b1
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scour.py
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@ -2339,6 +2339,8 @@ def optimizeTransform(transform):
elif (A1 == B2 and -1 <= A1 <= 1 and A3 == 0 elif (A1 == B2 and -1 <= A1 <= 1 and A3 == 0
and -B1 == A2 and -1 <= B1 <= 1 and B3 == 0 and -B1 == A2 and -1 <= B1 <= 1 and B3 == 0
# as cos² A + sin² A == 1 and as decimal trig is approximate: # as cos² A + sin² A == 1 and as decimal trig is approximate:
# FIXME: the "epsilon" term here should really be some function
# of the precision of the (sin|cos)_A terms, not 1e-15:
and abs((B1 ** 2) + (A1 ** 2) - 1) < Decimal("1e-15")): and abs((B1 ** 2) + (A1 ** 2) - 1) < Decimal("1e-15")):
[sin_A, cos_A] = [B1, A1] [sin_A, cos_A] = [B1, A1]
# while asin(A) and acos(A) both only have an 180° range # while asin(A) and acos(A) both only have an 180° range