def draw(cr)
cr.set_line_width(0.12)
cr.set_line_cap(Cairo::LINE_CAP_BUTT)
cr.move_to(0.25, 0.2)
cr.line_to(0.25, 0.8)
cr.stroke
cr.set_line_cap(Cairo::LINE_CAP_ROUND)
cr.move_to(0.5, 0.2)
cr.line_to(0.5, 0.8)
cr.stroke
cr.set_line_cap(Cairo::LINE_CAP_SQUARE)
cr.move_to(0.75, 0.2)
cr.line_to(0.75, 0.8)
cr.stroke
cr.set_source_rgba(1, 0.2, 0.2)
cr.set_line_width(0.01)
cr.move_to(0.25, 0.2)
cr.line_to(0.25, 0.8)
cr.move_to(0.5, 0.2)
cr.line_to(0.5, 0.8)
cr.move_to(0.75, 0.2)
cr.line_to(0.75, 0.8)
cr.stroke
end