testgauges.kv

<TestGauges>:

   g1: g1
   g3: g3
   clock: clock
   tank_label: tank_label

   GridLayout:
      cols: 2

      # First gauge, full size, default values
      CanvasGauge:
         id: g1
         values: 0,

      RelativeLayout:

         # A clock!
         CanvasGauge:
            size_hint: .8, .8
            pos_hint: {'x': .1, 'y': .1}
            id: clock
            values: root.hour, root.minute, root.second
            begin: 90
            end: -270
            mini: -0
            maxi: 60
            labels: [(0, '')] + [(h*5, str(h)) for h in range(1, 13)]
            needles_props: ({'width': 3, 'length': .6, 'color': (.5, .5, .5)}, {'width': 2, 'color': (.5, .5, .5)}, {'width': 1})

      RelativeLayout:

         Slider:
            id: slider
            orientation: 'vertical'
            min: g2.mini
            max: g2.maxi
            size_hint: .6, .8
            pos_hint: {'x': -.25, 'y': .1}
            on_value: root.tank_changed(100 * self.value / self.max)

         # Another gauge, value set by slider, reversed mini / maxi, custom labels, alarms
         CanvasGauge:
            id: g2
            values: slider.value,
            begin: -30
            end: -150
            mini: 0
            maxi: 10
            size_hint: .8, .8
            pos_hint: {'x': .15, 'y': .1}
            labels: ((0, 'Empty'), (5, 'Half'), (10, 'Full'))
            alarms: ((0, 1.99, (1, 0, 0, .8)), (2, 4.99, (1, 0, 0, .5)), (5, 7.99, (0, 1, 0, .5)), (8, 10, (0, 1, 0, .8)))

         Label:
            id: tank_label
            size_hint: .8, .8
            pos_hint: {'x': .15, 'y': .2}
            font_size: '24sp'
            markup: True
            canvas.before:
               Color:
                  rgba: 1, 1, 1, 1

      RelativeLayout:

         # Last gauge, right sided, with alarms
         CanvasGauge:
            size_hint: .8, .8
            pos_hint: {'x': .1, 'y': .1}
            id: g3
            values: 0,
            begin: 120
            end: -120
            mini: -40
            maxi: 140
            #alarms = ((mini, maxi, rgba), ...)
            alarms: ((-1000, 20, (0, 0, 1, .5)), (21, 100, (0, 1, 0, .5)), (101, 200, (1, 0, 0, .5)))