Nevron .NET Vision
Chart for .NET / User's Guide / Interactivity / Drag Tools / Callout Drag Tool

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    Callout Drag Tool
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    The callout drag tool is represented by the NCalloutDragTool class. When an object of this type is present in the Tools collection it will work with the current Selection to enable annotation dragging.

    The following code shows how to create an NCalloutDragTool

    C#
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    NChart chart = nChartControl1.Charts[0];
NPointSeries point = new NPointSeries();
point.Values.Add(10);
point.Values.Add(20);
chart.Series.Add(point);
NRectangularCallout callout1 = new NRectangularCallout();
callout1.UseAutomaticSize = true;
callout1.Text = "Annotation 1";
callout1.Orientation = 125;
callout1.ArrowLength = new NLength(40, NGraphicsUnit.Point);
callout1.Anchor = new NDataPointAnchor(point, 0, ContentAlignment.MiddleCenter, StringAlignment.Center);
chart.ChildPanels.Add(callout1);
NRectangularCallout callout2 = new NRectangularCallout();
callout2.UseAutomaticSize = true;
callout2.Text = "Annotation 2";
callout1.Orientation = 45;
callout2.ArrowLength = new NLength(40, NGraphicsUnit.Point);
callout2.Anchor = new NDataPointAnchor(point, 1, ContentAlignment.MiddleCenter, StringAlignment.Center);
chart.ChildPanels.Add(callout2);
nChartControl1.Controller.Tools.Add(new NSelectorTool());
nChartControl1.Controller.Tools.Add(new NCalloutDragTool());
    Visual Basic
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    Dim chart As NChart = NChartControl1.Charts(0)
Dim point As New NPointSeries()
point.Values.Add(10)
point.Values.Add(20)
chart.Series.Add(point)
Dim callout1 As New NRectangularCallout()
callout1.UseAutomaticSize = True
callout1.Text = "Annotation 1"
callout1.Orientation = 125
callout1.ArrowLength = New NLength(40, NGraphicsUnit.Point)
callout1.Anchor = New NDataPointAnchor(point, 0, ContentAlignment.MiddleCenter, StringAlignment.Center)
chart.ChildPanels.Add(callout1)
Dim callout2 As New NRectangularCallout
callout2.UseAutomaticSize = True
callout2.Text = "Annotation 2"
callout1.Orientation = 45
callout2.ArrowLength = New NLength(40, NGraphicsUnit.Point)
callout2.Anchor = New NDataPointAnchor(point, 1, ContentAlignment.MiddleCenter, StringAlignment.Center)
chart.ChildPanels.Add(callout2)
NChartControl1.Controller.Tools.Add(New NSelectorTool())
NChartControl1.Controller.Tools.Add(New NCalloutDragTool())

    Now when the user can drag the callouts.