I'm currently using AndroidPlot to display a dynamic XY plot. The Python script that usually displays this data also includes the ability to graph data with a logarithmic scale using Matplotlib. Is it possible to have a logarithmic Y-axis using AndroidPlot, or even any kind of y-axis with ticks that are not equally spaced value-wise?
Thank you for your help.
You can definitely do this with Androidplot, however it's not as simple as setting a config param.
The easiest approach is probably to extend an implementation of XYSeries and adjust the getY(int) method to return a log value instead of the raw value. For example to implement log10 on the y-axis only:
class LogXYSeries extends SimpleXYSeries {
public LogXYSeries(String title) {
super(title);
}
@Override
public Number getY(int index) {
final Number rawY = super.getY(index);
if(rawY != null) {
Math.log10(rawY.doubleValue());
}
return null;
}
}
As far as ticks go, you can configure those to appear by a fixed value increment or as an even subdivision of the visible range of values (default is to fit min/max in your series data, but you can manually set this if you prefer.) . I'd imagine subdividing would be what you're looking for with a log scale.
If I misunderstood what you're trying to accomplish and you just want to apply the log scale to the tick labels you can do that too. There's an example of setting a custom formatter in the Domain & Range Labels documentation for XYPlots.
