Updates:
Cc: smi...@gmail.com
Comment #6 on issue 2360 by asmeurer: Bug in geometry intersection
http://code.google.com/p/sympy/issues/detail?id=2360
The problem is in Segment.__contains__ at the very bottom of line.py, which
is copied below:
def __contains__(self, o):
"""Is the other GeometryEntity contained within this Ray?"""
if isinstance(o, Segment):
return o.p1 in self and o.p2 in self
elif isinstance(o, Point):
if Point.is_collinear(self.p1, self.p2, o):
d = self.length
if Point.distance(self.p1,o) <= d and
Point.distance(self.p2,o) <= d:
return True
# No other known entity can be contained in a Ray
return False
The inequalities in that last if statement are being evaluated to symbolic
Le()'s. It really should be checking is_nonnegative or something.
Unfortunately, it can't seem to handle the particular symbol expression for
this example, even after simplifying.
By the way, the code that used to be there, before the above commit that
first broke it was:
def __contains__(self, o):
if isinstance(o, Segment):
return ((o._p1 in self) and (o._p2 in self))
elif isinstance(o, Point):
if Point.is_collinear(self._p1, self._p2, o):
x1,x2 = self._p1[0], self._p2[0]
if (not x1.atoms(type=Basic.Symbol)) and (not
x2.atoms(type=Basic.Symbol)):
return (min(x1,x2) <= o[0] <= max(x1,x2))
else:
return True
else:
return False
else:
return False
Which worked fine, at least for this example.
Any ideas?
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