496     int dx, dy, t, e, x, y, incy, diago, horiz;  in draw_line()  local
523         t = y2;  in draw_line()
525         x2 = t;  in draw_line()
527         t = y1;  in draw_line()
529         x1 = t;  in draw_line()
531         t = dx;  in draw_line()
533         dy = t;  in draw_line()
539         t = y2;  in draw_line()
541         y1 = t;  in draw_line()
543         t = x1;  in draw_line()
545         x2 = t;  in draw_line()