Angle change = get_point().angle() - old_angle;
while (change < Angle::deg(-180)) change += Angle::deg(360);
while (change > Angle::deg(180)) change -= Angle::deg(360);
Angle change = get_point().angle() - old_angle;
while (change < Angle::deg(-180)) change += Angle::deg(360);
while (change > Angle::deg(180)) change -= Angle::deg(360);