How to move an annotation?


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Clara Lau
Clara Lau
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Posts: 2, Visits: 1

Hi,

I would like to move an existing annotation to a new location with the pointer still pointing at the same point on the graph. Is ArrowLength the property I need to change? If so, I would like to keep the anchor, but change the arrow length. Depends on the new location, the arrow length will lengthen and shorten dynamically. How would I do that? Here's my code:

 

Dim currentAnchor As nev.NScalePointAnchor = CType(mMovingAnnotation.Anchor, nev.NScalePointAnchor)

If transformViewToData(currentAnchor.VertAxisIndex, e.X, e.Y, scalePoint) Then

mMovingAnnotation.Anchor = New nev.NScalePointAnchor(Me.chart, nev.StandardAxis.PrimaryX, currentAnchor.VertAxisIndex, nev.StandardAxis.Depth, False, scalePoint)

mMovingAnnotation.ArrowLength = New Nevron.GraphicsCore.NLength(10, Nevron.GraphicsCore.NRelativeUnit.ParentPercentage)

Me.ChartControl.Refresh()

End If

******************************************************

Private Function transformViewToData(ByVal verticalAxisIndex As Integer, ByVal x As Integer, ByVal y As Integer, ByRef result As nevG.NVector3DD) As Boolean

' transforms a click point to a point with coords scaled to a specific Y Axis on the chart

result = New nevG.NVector3DD

Dim ptViewPoint As New nevG.NPointF(CSng(x), CSng(y))

Dim viewToScale As New nev.NViewToScale3DTransformation(Me.ChartControl.View.Context, Me.chart, nev.StandardAxis.PrimaryX, verticalAxisIndex, nev.StandardAxis.Depth, 0.0)

Return viewToScale.Transform(ptViewPoint, result)

End Function

 

Thanks,

Clara


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