vect2_cart cart; /**<< target, if it is a x,y vector */
struct rs_polar pol; /**<< target, if it is a d,a vector */
struct circle_target circle; /**<< target, if it is a circle */
vect2_cart cart; /**<< target, if it is a x,y vector */
struct rs_polar pol; /**<< target, if it is a d,a vector */
struct circle_target circle; /**<< target, if it is a circle */