[Camath-develop] [prototype]the Period

[L m. <heh...@gm...>]

http://groups.google.com/group/caMath/browse_thread/thread/e0ff92b3f6a85932=
/?hl=3Den

 The basic Period prototype
writen by python,can checkout from camath svnserver and it's revision
is 2.There are 4 .py files.camath.py is the testcase entry.

First, the Segment class : like as the name,it's defined by 2
properties  {begin,end}.

And then,the TimeSlice class is declared as a special Segment
class.it's properties' type is time/date. And it contains 3 methods
{contain,plus,minus} and 2 compare operations {__cmp__,__eq__} to
support operations {>,<,=3D=3D,!=3D ..}.

#a and b both are TimeSlice objects.

a.contain(b):  2 TimeSlice objects contain 3 status:
[a.b,a.e] [b.b,b.e]   : no cross ;0
[a.b, b.b,a.e b.e]    : cross;1
[a.b,b.b,b.e,a.e]     : contain;2

a.plus(b): 2 TimeSlice objects can plus (merge) and a.plus(b) =3D=3D
b.plus(a),because of above and the Time's physical meaning:
no cross:  TimeSlice(a),TimeSlice(b)
cross:       TimeSlice(a.b,b.e)
contain:    TimeSlice(a)

a.minus(b):as above:
no cross:TimeSlice(a)
cross:
    a<b    TimeSlice(a.b,b.b)
    a>b    TimeSlice(b.e,a.e)
contain:
    a<b     TimeSlice(a.b,b.b),TimeSlice(b.e,a.e)
    a>b     TimeSlice()

3th,the Period is reflected by a set of TimeSlice.it contains 3
methods{RemoveSliceByValue,GetPeriodOrder,GetPeriodMerge}.

as above,blabla...

that's all.next post lets discuss the durative hypotheses.
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