Limit zoom on DateTime axis

Question

I am using SciChart with DateTimeAxis.

My items are starting from 15 May 2016 8:30 AM and ending on 25 May 2016 8:30 AM. Initial value of VisibleRange is set this this range as well. I have also added VisibleRangeLimit again with same range.

But the problem is that when I am scrolling to corners, date values are going out of my range and, as a result, on some zoom levels I see dates out of my allowed range, like 15 May 2016 8:25 AM. This is causing to blank are for 5 minutes.

Is there any way to really limit visible range?

Answer 1

Yes there is,

From the Documentation: Clipping the Axis.VisibleRange on Zoom and Pan.

Advanced VisibleRange Clipping and Manipulation

Axis.VisibleRangeLimit is a useful API to ensure the axis clips the VisibleRange when zooming to extents. However, it will not stop a user from scrolling outside of that range. To achieve that, you need a small modification:

Clipping Axis.VisibleRange in Code

To clip the VisibleRange and force a certain maximum or minimum, just use the following code:

axis.VisibleRangeChanged += (s, e) =>
{
   // e is VisibleRangeChangedEventArgs
   // Assuming axis is NumericAxis

   if (e.NewVisibleRange != null && e.NewVisibleRange.Min < 0)
   {
      // Force minimum visiblerange to zero always
      ((NumericAxis)sender).VisibleRange = new DoubleRange(0, e.NewVisibleRange.Max);
   }
};

Clipping Axis.VisibleRange with MVVM

The same can be achieved in MVVM by creating a custom behavior.

public class AxisClippingBehavior : Behavior<AxisBase>
  {
    protected override void OnAttached()
    {
        base.OnAttached();

        AssociatedObject.VisibleRangeChanged +=OnVisibleRangeChanged;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();

        AssociatedObject.VisibleRangeChanged -= OnVisibleRangeChanged;
    }

    private void OnVisibleRangeChanged(object sender, VisibleRangeChangedEventArgs visibleRangeChangedEventArgs)
    {
        var visibleRangeLimit = AssociatedObject.VisibleRangeLimit;
        if (visibleRangeLimit != null)
        {
            var limitMode = AssociatedObject.VisibleRangeLimitMode;

            var range = (IRange)AssociatedObject.VisibleRange.Clone();
            range.ClipTo(visibleRangeLimit, limitMode);

            AssociatedObject.SetCurrentValue(AxisBase.VisibleRangeProperty, range);
        }
    }
}