61 lines
1.2 KiB
Python
61 lines
1.2 KiB
Python
"""
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A 2-dimensional vector class
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# BEGIN VECTOR2D_V0_DEMO
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>>> v1 = Vector2d(3, 4)
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>>> x, y = v1 #<1>
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>>> x, y
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(3.0, 4.0)
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>>> v1 #<2>
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Vector2d(3.0, 4.0)
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>>> v1_clone = eval(repr(v1)) #<3>
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>>> v1 == v1_clone
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True
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>>> print(v1) #<4>
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(3.0, 4.0)
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>>> octets = bytes(v1) #<5>
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>>> octets
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b'\\x00\\x00\\x00\\x00\\x00\\x00\\x08@\\x00\\x00\\x00\\x00\\x00\\x00\\x10@'
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>>> abs(v1) #<6>
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5.0
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>>> bool(v1), bool(Vector2d(0, 0)) #<7>
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(True, False)
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# END VECTOR2D_V0_DEMO
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"""
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# BEGIN VECTOR2D_V0
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from array import array
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import math
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class Vector2d:
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typecode = 'd' # <1>
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def __init__(self, x, y):
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self.x = float(x) # <2>
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self.y = float(y)
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def __iter__(self):
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return (i for i in (self.x, self.y)) # <3>
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def __repr__(self):
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return 'Vector2d({!r}, {!r})'.format(*self) # <4>
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def __str__(self):
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return str(tuple(self)) # <5>
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def __bytes__(self):
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return bytes(array(Vector2d.typecode, self)) # <6>
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def __eq__(self, other):
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return tuple(self) == tuple(other) # <7>
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def __abs__(self):
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return math.hypot(self.x, self.y)
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def __bool__(self):
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return bool(abs(self)) # <8>
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# END VECTOR2D_V0
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