picture to draw on 0: fill rectangle 1: draw outline only (1 pixel thickness) picture drawn on note: also supports other methods of #draw_polygon... "outline" was designed before [#draw_polygon]'s "draw line" option became available. it makes a 10-gon with repeated vertices, to simulate a hollow square. same as with [#draw_polygon] op (default: put) polygon (default: 0 2 #) color (default: 1 #)