65 lines
1.4 KiB
Python
65 lines
1.4 KiB
Python
"""
|
|
A 2-dimensional vector class
|
|
|
|
# BEGIN VECTOR2D_V0_DEMO
|
|
|
|
>>> v1 = Vector2d(3, 4)
|
|
>>> print(v1.x, v1.y) # <1>
|
|
3.0 4.0
|
|
>>> x, y = v1 # <2>
|
|
>>> x, y
|
|
(3.0, 4.0)
|
|
>>> v1 # <3>
|
|
Vector2d(3.0, 4.0)
|
|
>>> v1_clone = eval(repr(v1)) # <4>
|
|
>>> v1 == v1_clone # <5>
|
|
True
|
|
>>> print(v1) # <6>
|
|
(3.0, 4.0)
|
|
>>> octets = bytes(v1) # <7>
|
|
>>> octets
|
|
b'd\\x00\\x00\\x00\\x00\\x00\\x00\\x08@\\x00\\x00\\x00\\x00\\x00\\x00\\x10@'
|
|
>>> abs(v1) # <8>
|
|
5.0
|
|
>>> bool(v1), bool(Vector2d(0, 0)) # <9>
|
|
(True, False)
|
|
|
|
# END VECTOR2D_V0_DEMO
|
|
"""
|
|
|
|
# BEGIN VECTOR2D_V0
|
|
from array import array
|
|
import math
|
|
|
|
|
|
class Vector2d:
|
|
typecode = 'd' # <1>
|
|
|
|
def __init__(self, x, y):
|
|
self.x = float(x) # <2>
|
|
self.y = float(y)
|
|
|
|
def __iter__(self):
|
|
return (i for i in (self.x, self.y)) # <3>
|
|
|
|
def __repr__(self):
|
|
class_name = type(self).__name__
|
|
return '{}({!r}, {!r})'.format(class_name, *self) # <4>
|
|
|
|
def __str__(self):
|
|
return str(tuple(self)) # <5>
|
|
|
|
def __bytes__(self):
|
|
return (bytes([ord(self.typecode)]) + # <6>
|
|
bytes(array(self.typecode, self))) # <7>
|
|
|
|
def __eq__(self, other):
|
|
return tuple(self) == tuple(other) # <8>
|
|
|
|
def __abs__(self):
|
|
return math.hypot(self.x, self.y) # <9>
|
|
|
|
def __bool__(self):
|
|
return bool(abs(self)) # <10>
|
|
# END VECTOR2D_V0
|