gr_open_graph
gr_close_graph
gr_sigio_signal
gr_sigio_handler
gr_clear_graph
gr_size_x
gr_size_y
gr_set_color
gr_plot
gr_point_color
gr_moveto
gr_current_point
gr_lineto
gr_draw_arc_nat
gr_draw_arc
gr_set_line_width
gr_fill_rect
gr_fill_poly
gr_fill_arc_nat
gr_fill_arc
gr_draw_char
gr_draw_string
gr_set_font
gr_set_text_size
gr_text_size
gr_make_image
gr_dump_image
gr_draw_image
gr_create_image
gr_blit_image
gr_wait_event
gr_sound