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from numbers import Number
import math
import operator
import warnings
__all__ = ["Vector"]
class Vector(tuple):
"""A math-like vector.
Represents an n-dimensional numeric vector. ``Vector`` objects support
vector addition and subtraction, scalar multiplication and division,
negation, rounding, and comparison tests.
"""
__slots__ = ()
def __new__(cls, values, keep=False):
if keep is not False:
warnings.warn(
"the 'keep' argument has been deprecated",
DeprecationWarning,
)
if type(values) == Vector:
# No need to create a new object
return values
return super().__new__(cls, values)
def __repr__(self):
return f"{self.__class__.__name__}({super().__repr__()})"
def _vectorOp(self, other, op):
if isinstance(other, Vector):
assert len(self) == len(other)
return self.__class__(op(a, b) for a, b in zip(self, other))
if isinstance(other, Number):
return self.__class__(op(v, other) for v in self)
raise NotImplementedError()
def _scalarOp(self, other, op):
if isinstance(other, Number):
return self.__class__(op(v, other) for v in self)
raise NotImplementedError()
def _unaryOp(self, op):
return self.__class__(op(v) for v in self)
def __add__(self, other):
return self._vectorOp(other, operator.add)
__radd__ = __add__
def __sub__(self, other):
return self._vectorOp(other, operator.sub)
def __rsub__(self, other):
return self._vectorOp(other, _operator_rsub)
def __mul__(self, other):
return self._scalarOp(other, operator.mul)
__rmul__ = __mul__
def __truediv__(self, other):
return self._scalarOp(other, operator.truediv)
def __rtruediv__(self, other):
return self._scalarOp(other, _operator_rtruediv)
def __pos__(self):
return self._unaryOp(operator.pos)
def __neg__(self):
return self._unaryOp(operator.neg)
def __round__(self, *, round=round):
return self._unaryOp(round)
def __eq__(self, other):
if isinstance(other, list):
# bw compat Vector([1, 2, 3]) == [1, 2, 3]
other = tuple(other)
return super().__eq__(other)
def __ne__(self, other):
return not self.__eq__(other)
def __bool__(self):
return any(self)
__nonzero__ = __bool__
def __abs__(self):
return math.sqrt(sum(x * x for x in self))
def length(self):
"""Return the length of the vector. Equivalent to abs(vector)."""
return abs(self)
def normalized(self):
"""Return the normalized vector of the vector."""
return self / abs(self)
def dot(self, other):
"""Performs vector dot product, returning the sum of
``a[0] * b[0], a[1] * b[1], ...``"""
assert len(self) == len(other)
return sum(a * b for a, b in zip(self, other))
# Deprecated methods/properties
def toInt(self):
warnings.warn(
"the 'toInt' method has been deprecated, use round(vector) instead",
DeprecationWarning,
)
return self.__round__()
@property
def values(self):
warnings.warn(
"the 'values' attribute has been deprecated, use "
"the vector object itself instead",
DeprecationWarning,
)
return list(self)
@values.setter
def values(self, values):
raise AttributeError(
"can't set attribute, the 'values' attribute has been deprecated",
)
def _operator_rsub(a, b):
return operator.sub(b, a)
def _operator_rtruediv(a, b):
return operator.truediv(b, a)
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