This event occurs when the viewport is changed through mouse actions, or when WPFChartViewer.updateViewPort
WPFViewPortEventHandler is a delegate representing the signature of the method that can be used to handle viewport changed events. It is declared as follows.
Public Delegate Sub WPFViewPortEventHandler(sender As Object, e As WPFViewPortEventArgs)
public delegate void WPFViewPortEventHandler(object sender, WPFViewPortEventArgs e);
In the above, "sender" is the object that raises the event, and "e" is a WPFViewPortEventArgs
object that contains the event data.
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