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 autoscale on DataLoggerView variation

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gstola Posted - 19 Jun 2015 : 15:20:18

I am working on a data logger application. I took DataLoggerView.java from dynamicscharts example as a base.

My issue occurs when my traces evolves in a way that they occupies a smaller part of the chart, without rescaling it. In other words, y-axis should zoom in but it doesnt.

So, I went back to the dynamicscharts example to check where was my mistake by comparing both codes. There, I just made a small change, to force the traces tendence. In practice, Ive modulated the four traces with an exponential, to guarantee that traces converged to some positive value. Under that context, I found that the y-axis didnt zoom in. That is, the four traces were around 800, but the x-axis still was there.

In short how should DataLoggerView example be changed so it autoscales in a way that always occupies most of the chart?

Thank you!
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quinncurtis Posted - 20 Jun 2015 : 09:20:42
The auto-scaling in the Datalogger example takes place in the addNewPoints method, in the following lines. The call to pTransform1.autoScale is what rescales the y-scale to current data. The calcAutoAxis calls make sure the existing axes adapt to the new scale.

    xValues = Dataset1.getTimeXData();
    nNumPnts = Dataset1.getNumberDatapoints();
    pTransform1.autoScale(Dataset1,ChartConstants.AUTOAXES_NEAR,  ChartConstants.AUTOAXES_NEAR);
    if (fixedStartTimeFlag)
      pTransform1.setTimeScaleStart(xValues[0]); // peg start of graph at start of data
    else // Set a 100 point view into data


So you must do something similar in your own code. If you can't get it to work, show exactly what code you are using to achieve the auto-scaling of the y-scale and axis.

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