def line_xy(x1, y1, x2, y2, draw)
      use_cairo do |cc|
        cc.move_to(x1, y1)
        cc.line_to(x2, y2)
        cc.fancy_stroke(draw)
      end
    end
def line_xy(x1, y1, x2, y2, draw)
      use_cairo do |cc|
        cc.move_to(x1, y1)
        cc.line_to(x2, y2)
        cc.fancy_stroke(draw)
      end
    end
:nodoc:
 @api private