title: Qt QML for a digital dashboard
body: <p>I am trying to develop in Qt QML a digital dashboard composed by a
  speedometer and a tachometer with a needle each.
  The problem of this design arises when i am involved in a rotation
  of the needle: in this case, it has a jerky movement and it is not as
  fluent as a real needle.
  For instance, let us suppose to have 0 km/h i.e. the needle situated at
  0 degrees and then I want to show 100 km/h situated at 90 degrees, the
  needle reaches this angle with a sequence of fast jerks and not as a
  unique fluent movement.
  Does anyone have an idea to solve the inconvenient? Should I have to
  use openGL?</p>
  
  <p>I report the code below (I have used the QML Rotation function but it
  is not enough)</p>
  
  <pre><code>Image {
      id: needle
      source: "../../images/needle.png"
      antialiasing: true
      transform: Rotation {
          id: needleRotation
          origin.x: 80;
          origin.y: 80;
          angle: 0
          Behavior on angle {
              RotationAnimation {
                  id: needleRotationAnimation
                  direction: RotationAnimation.Shortest;
                  easing.type: Easing.InOutCubic;
                  duration: 20;
              }
          }
      }
  }
  </code></pre>