Class Vector2

recipes/Python/576959_Boids_20_for_Python_31/recipe-576959.py:489–950

################################################################################

class Vector2:

    # See all the nice vector operations above?
    # The following class implements those instructions.

    __slots__ = 'x', 'y'

    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __repr__(self):
        return 'Vector2({!r}, {!r})'.format(self.x, self.y)

    def polar_repr(self):
        x, y = self.x, self.y
        magnitude = hypot(x, y)
        angle = degrees(atan2(x, y)) % 360
        return 'Polar2({!r}, {!r})'.format(magnitude, angle)

    # Rich Comparison Methods

    def __lt__(self, obj):
        if isinstance(obj, Vector2):
            x1, y1, x2, y2 = self.x, self.y, obj.x, obj.y
            return x1 * x1 + y1 * y1 < x2 * x2 + y2 * y2
        return hypot(self.x, self.y) < obj

    def __le__(self, obj):
        if isinstance(obj, Vector2):
            x1, y1, x2, y2 = self.x, self.y, obj.x, obj.y
            return x1 * x1 + y1 * y1 <= x2 * x2 + y2 * y2
        return hypot(self.x, self.y) <= obj

    def __eq__(self, obj):
        if isinstance(obj, Vector2):
            return self.x == obj.x and self.y == obj.y
        return hypot(self.x, self.y) == obj

    def __ne__(self, obj):
        if isinstance(obj, Vector2):
            return self.x != obj.x or self.y != obj.y
        return hypot(self.x, self.y) != obj

    def __gt__(self, obj):
        if isinstance(obj, Vector2):
            x1, y1, x2, y2 = self.x, self.y, obj.x, obj.y
            return x1 * x1 + y1 * y1 > x2 * x2 + y2 * y2
        return hypot(self.x, self.y) > obj

    def __ge__(self, obj):
        if isinstance(obj, Vector2):
            x1, y1, x2, y2 = self.x, self.y, obj.x, obj.y
            return x1 * x1 + y1 * y1 >= x2 * x2 + y2 * y2
        return hypot(self.x, self.y) >= obj

    # Boolean Operation