def set_cartesian_coordinate(self, x, y):
"""
Set cartesian coordinate
"""
cartesian = CartesianCoordinate(x, y)
r, t = cartesian.to_polar()
self.set_polar_coordinate(r, math.degrees(t))
def sort_children(children, father):
"""
"""
if len(children) < 2:
return children
# create angle reference
f_x, f_y = father.get_cartesian_coordinate()
for child in children:
c_x, c_y = child.get_cartesian_coordinate()
_, angle = CartesianCoordinate(c_x - f_x, c_y - f_y).to_polar()
child.set_draw_info({'angle_from_father': math.degrees(angle)})
return sort_children_by_angle(children)
