
cairo_move_to (cr, 0.1, -50); cairo_line_to (cr, 0.1, 50); cairo_set_rgb_color (cr, 1, 0 ,0); cairo_stroke (cr); cairo_move_to (cr, 0.2, -60); cairo_line_to (cr, 0.2, 60); cairo_set_rgb_color (cr, 1, 1 ,0); cairo_stroke (cr); cairo_move_to (cr, 0.3, -70); cairo_line_to (cr, 0.3, 70); cairo_set_rgb_color (cr, 0, 1 ,0); cairo_stroke (cr); cairo_move_to (cr, 0.4, -80); cairo_line_to (cr, 0.4, 80); cairo_set_rgb_color (cr, 0, 0 ,1); cairo_stroke (cr);