Android Plot for String Parameters - string

Question

My app requires the Y-axis to have strings like 'Charging', 'Discharging' and 'Charging Failed'. Is it possible to plot a graph with this and have the parameter in question depicted in accordance with these strings on Android Plot?

Answer 1

I'm still not 100% sure I'm understanding the desired visualization but here are the basic steps I would suggest:
To start, you're going to need to convert your CSV data in to XYSeries data. To accomplish this, you'll need to map your current X/Y string values to numbers. I'd suggest creating a method that looks something like this:
// parses a CSV string into an XYSeries
// for example, DISCHARGE = 1, MPPT = 2
public XYSeries convertCSVToXYSeries(String csvContent) {...}
Next, setup your Plot etc. pretty much the same way you would for any other XYPlot as shown in the Androidplot Quickstart Tutorial.
When you add the XYSeries you get back from convertCSVToXYSeries to your plot, use an XYStepFormatter:
StepFormatter stepFormatter = new StepFormatter(Color.BLUE, Color.BLUE);
stepFormatter.setVertexPaint(null); // don't draw individual points
plot.addSeries(series, stepFormatter);
Finally, add a custom range value formatter to print your status strings instead of the int values they've been mapped to:
// create a custom getFormatter to draw our state names as range tick labels:
plot.setRangeValueFormat(new Format() {
#Override
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
Number num = (Number) obj;
switch(num.intValue()) {
case 1:
toAppendTo.append("DISCHARGE");
break;
case 2:
toAppendTo.append("MPPT");
break;
default:
toAppendTo.append("Unknown");
break;
}
return toAppendTo;
}
#Override
public Object parseObject(String source, ParsePosition pos) {
return null;
}
});