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561     CvPoint pt_s, pt_e;         /*  first and last points  */
602         CV_READ_SEQ_ELEM( pt_s, reader );
608         nx = pt_s.y - pt_e.y;
609         ny = pt_e.x - pt_s.x;
631                 sk = nx * (xi - pt_s.x) + ny * (yi - pt_s.y);
660                             t = ((yi_1 - pt_s.y) * du + dv * (pt_s.x - xi_1)) /
663                             t = (xi_1 - pt_s.x) / dx;
666                             x_s = pt_s.x + t * dx;
667                             y_s = pt_s.y + t * dy;