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autoscale on DataLoggerView variation

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T O P I C R E V I E W
gstola	Posted - 19 Jun 2015 : 15:20:18 Hi, 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! Gerardo
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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 pTransform1.setTimeScaleStart(Dataset1.getTimeXDataValue(Dataset1.getNumberDatapoints()-100)); xAxis1.calcAutoAxis(); yAxis1.calcAutoAxis(); xAxisLab1.calcAutoAxisLabels(); yAxisLab1.calcAutoAxisLabels(); 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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