Sweaters

Thomas: class Vector(object):
def __init__(self, a=0, b=0 ):
if _is_numeric(a):
self.x = a
self.y = b
else:
self.x = b[0] - a[0]
self.y = b[1] - a[1]
def __getitem__(self, index):
if index == 0:
return self.x
elif index == 1:
return self.y
else:
raise IndexError
def __add__(self, other):
return Vector(self.x + other.x, self.y + other.y)
def __sub__(self, other):
return Vector(self.x - other.x, self.y - other.y)
def __mul__(self, other):
try:
other = other - 0
except:
raise TypeError, "Only scalar multiplication is supported."
return Vector( other * self.x, other * self.y )
def __rmul__(self, other):
return self.__mul__(other)
def __div__(self, other):
return Vector( self.x / other, self.y / other )
def __neg__(self):
return Vector(-self.x, -self.y)
def __abs__(self):
return self.length()
def __repr__(self):
return '(%s, %s)' % (self.x, self.y)
def __str__(self):
return '(%s, %s)' % (self.x, self.y)
def dot(self, vector):
return self.x * vector.x + self.y * vector.y
def cross(self, vector):
return self.x * vector.y - self.y * vector.x
def length(self):
return math.sqrt( self.dot(self) )
def perpindicular(self):
return Vector(-self.y, self.x)
def unit(self):
return self / self.length()
def projection(self, vector):
k = (self.dot(vector)) / vector.length()
return k * vector.unit()
def angle(self, vector=None):
if vector == None:
vector = Vector(1,0)
return math.acos((self.dot(vector))/(self.length() * vector.length()))
def angle_in_degrees(self, vector=None):
return (self.angle(vector) * 180) /math.pi
def re

that helps

i googled that!

alright, time to knit some sweaters

later

me: laters