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comparison skaapsteker/utils.py @ 619:4ffa9d159588

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Some coordinate operators, to reduce foo_x, foo_y everywhere.
author Jeremy Thurgood <firxen@gmail.com>
date Fri, 06 May 2011 16:37:43 +0200
parents
children 35919d12b792
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618:72865593bdc7 619:4ffa9d159588
1 import operator
2 import functools
3
4
5 def mktuple(thing):
6 if isinstance(thing, (list, tuple)):
7 return tuple(thing)
8 return (thing, thing)
9
10
11 def coord_op(fun, coord, operand):
12 operand = mktuple(operand)
13 return (fun(coord[0], operand[0]),
14 fun(coord[1], operand[1]))
15
16
17 def mk_cop(op):
18 return functools.partial(coord_op, op)
19
20
21 def mk_cuop(op):
22 return lambda coord: (op(coord[0]), op(coord[1]))
23
24
25 cadd = mk_cop(operator.add)
26 csub = mk_cop(operator.sub)
27 cmul = mk_cop(operator.mul)
28 cdiv = mk_cop(operator.div)
29 cclamp = mk_cop(lambda a, b: max(min(a, b), -b))
30
31 cint = mk_cuop(int)
32 cneg = mk_cuop(lambda a: -a)
33 cabs = mk_cuop(abs)
34