

_G_r_a_p_h_i_c_a_l _I_n_p_u_t

     locator(n=1)

_D_e_s_c_r_i_p_t_i_o_n:

     `locator' reads the position of the graphics cursor
     when the (first) mouse button is pressed.  Unless the
     process is terminated prematurely by the user (see
     below) at most `n' positions are determined.

     The input process can be terminated prematurely by
     pressing any mouse button other than the first, or by
     clicking outside the graphics window.

_V_a_l_u_e:

     A list containing `x' and `y' components which are the
     coordinates of the identified points.

