--?   love.graphics.line(Line_width,0, Line_width,App.screen.height)

  App.run_after_mouse_press(Margin_left+256, Margin_top-3, 1)
  App.mouse_move(Margin_left+200, 37)

  App.run_after_mouse_press(256, Margin_top-3, 1)
  App.mouse_move(200, 37)

  button('line-width', {x=Margin_left+Line_width-4,y=Margin_top-10, w=10,h=10, color={1,1,1},

  button('line-width', {x=Line_width-4,y=Margin_top-10, w=10,h=10, color={1,1,1},

      Line_width = App.mouse_x() - Margin_left

      Line_width = App.mouse_x()