限制 DateTime 轴上的缩放

Question

我正在将 SciChart 与 DateTimeAxis 一起使用。

我的商品从 2016 年 5 月 15 日 8:30 上午开始，到 2016 年 5 月 25 日 8:30 上午结束。 VisibleRange 的初始值也设置为这个范围。我还再次添加了具有相同范围的 VisibleRangeLimit。

但问题是，当我滚动到角落时，日期值超出了我的范围，因此，在某些缩放级别上，我看到日期超出了我允许的范围，例如 2016 年 5 月 15 日 8:25上午。这导致空白 5 分钟。

有没有办法真正限制可见范围？

Answer 1

是的，

来自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);
        }
    }
}

限制 DateTime 轴上的缩放

Limit zoom on DateTime axis

wpf

datetime

wpf-controls

scichart