barbaros a écrit :
Hello everybody,
I am building a code for surface meshes (triangulations for instance).
I need to implement Body objects (bodies can be points, segments,
triangles and so on), then a Mesh will be a collection of bodies,
together with their neighbourhood relations.
I also need OrientedBody objects, which consist in a body
together with a plus or minus sign to describe its orientation.
So, basically an OrientedBody is just a Body with an
integer label stuck on it.
I implemented it in a very crude manner:
------------------------------------------
class Body:
Unless you need compatibility with pre-2.2 Python versions, use a
new-style class instead:
class Body(object):
[...]
class OrientedBody:
def __init__ (self,b,orient=1):
# b is an already existing body
assert isinstance(b,Body)
self.base = b
self.orientation = orient
-------------------------------------------
My question is: can it be done using inheritance ?
Technically, yes:
class OrientedBody(Body):
def __init__(self, orient=1):
Body.__init__(self)
self.orient = 1
Now if it's the right thing to do is another question... Another
possible design could be to have an orient attribute on the Body class
itself, with 0 => non-oriented (default), 1 => 'plus', -1 => 'minus' (or
any other convention, depending on how you use this attribute).
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