请看下面的例子：
dev_clear_window () dev_close_window () dev_open_window (0, 0, 512, 512, 'black', WindowHandle) gen_circle_contour_xld (ContCircle, 200, 200, 100, 0, 6.28318, 'positive', 1) query_contour_global_attribs_xld (ContCircle, Attribs) regress_contours_xld (ContCircle, RegressContours, 'no', 1) query_contour_global_attribs_xld (RegressContours, Attribs1) get_contour_global_attrib_xld (RegressContours, 'regr_norm_row', Attrib) get_regress_params_xld (RegressContours, Length, Nx, Ny, Dist, Fpx, Fpy, Lpx, Lpy, Mean, Deviation)