The data cursor feature of the control allows you to synchronize the values of axis cursors (represented by the NAxisCursor object) with the mouse coordinates transformed to axis coordinates.
You enable the data cursor feature by adding an object of type NDataCursorTool to the Tools collection of the control:
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// add horizontal axis cursor NAxisCursor horzAxisCursor = new NAxisCursor(); horzAxisCursor.BeginEndAxis = (int)StandardAxis.PrimaryY; horzAxisCursor.SynchronizeOnMouseAction = MouseAction.Down; chart.Axis(StandardAxis.PrimaryX).Cursors.Add(horzAxisCursor); // add vertical axis cursor NAxisCursor vertAxisCursor = new NAxisCursor(); vertAxisCursor.BeginEndAxis = (int)StandardAxis.PrimaryX; vertAxisCursor.SynchronizeOnMouseAction = MouseAction.Down; chart.Axis(StandardAxis.PrimaryY).Cursors.Add(vertAxisCursor); // add selector and data cursor tool chartControl.Controller.Tools.Add(new NSelectorTool()); chartControl.Controller.Tools.Add(new NDataCursorTool()); |
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| Visual Basic |
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' add horizontal axis cursor Dim horzAxisCursor As New NAxisCursor horzAxisCursor.BeginEndAxis = CType(StandardAxis.PrimaryY, Integer) horzAxisCursor.SynchronizeOnMouseAction = MouseAction.Down chart.Axis(StandardAxis.PrimaryX).Cursors.Add(horzAxisCursor) ' add vertical axis cursor Dim vertAxisCursor As New NAxisCursor vertAxisCursor.BeginEndAxis = CType(StandardAxis.PrimaryX, Integer) vertAxisCursor.SynchronizeOnMouseAction = MouseAction.Down chart.Axis(StandardAxis.PrimaryY).Cursors.Add(vertAxisCursor) ' add selector and data cursor tool chartControl.Controller.Tools.Add(New NSelectorTool) chartControl.Controller.Tools.Add(New NDataCursorTool) |
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Now when the user presses the left mouse button over the chart the axis cursors will be positioned at the this location.