def heading_to_unit_dxdy(heading) -> Velocity:
""" Convert a heading to a (dx, dy) pair as a unit velocity """
angle = utils.heading_to_angle(heading)
dx = utils.cos(angle)
# The -1 accounts for the y-axis being inverted.
dy = (-1) * utils.sin(angle)
vel = Velocity((dx, dy))
return vel
def _dy(heading):
angle = heading_to_angle(heading)
delta_y = utils.sin(angle)
# make it negative to account for inverted y axis
return (-1)*delta_y