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  3rd Y axis update with pan/zoom (.net winforms)
Posted by Kjetil Jasund on Dec-03-2012 18:48
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Hello

I have a 2d line plot with zoom and pan. x, y and y2 axis are updated with zoom and pan
by using these lines:

(In the drawChart :)
        viewer.syncLinearAxisWithViewPort("x", c.xAxis())
        viewer.syncLinearAxisWithViewPort("y", c.yAxis())
        viewer.syncLinearAxisWithViewPort("y2", c.yAxis2())

How could I get my 3rd y axis to automatically update when I zoom/pan?

I want to write
viewer.syncLinearAxisWithViewPort("y3", c.yAxis(rightAxis))
but i'm not allowed


3rd axis definition and use:

Dim layer4 As LineLayer = c.addLineLayer(dataY4, c.dashLineColor(&H33FF33,
Chart.DashLine), "Pump A Tot.V [l]")
        layer4.setXData(dataX4)

        ' Add the fouth y-axis at 50 pixels to the right of the plot area
        Dim rightAxis As Axis = c.addAxis(Chart.Right, 50)
        ' Add a title on top of the fourth y axis.
        rightAxis.setTitle("Volume [l]").setAlignment(Chart.TopRight2)
        ' Set the axis, label and title colors for the fourth y axis to purple (880088)
        ' to match the fourth data set
        rightAxis.setColors(&H880088, &H880088, &H880088)


        ' Set the line width to 3 pixels
        layer4.setLineWidth(3)
        layer4.setUseYAxis(rightAxis)


best regards Kjetil Jasund

  Re: 3rd Y axis update with pan/zoom (.net winforms)
Posted by Peter Kwan on Dec-04-2012 00:26
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Hi Kjetil,

In your code, the third axis is the rightAxis:

viewer.syncLinearAxisWithViewPort("y3", rightAxis)

Hope this can help.

Regards
Peter Kwan

  Re: 3rd Y axis update with pan/zoom (.net winforms)
Posted by Kjetil Jasund on Dec-04-2012 13:53
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Works perfect. Thank you.

  Re: 3rd Y axis update with pan/zoom (.net winforms)
Posted by gang on Jun-21-2013 05:13
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I tried this in my project and unhandled exception occurred. The debug information is below:

System.NullReferenceException: Object reference not set to an instance of an object.
   at ChartDirector.WinChartViewer.a(Axis A_0, String A_1, Int32 A_2)
   at ChartDirector.WinChartViewer.syncLinearAxisWithViewPort(String id, Axis axis)

I'm developing with C#, WindowsForm application.

Any suggestion?

  Re: 3rd Y axis update with pan/zoom (.net winforms)
Posted by gang on Jun-21-2013 05:33
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My bad. It is functioning.