public void addClickable(int datasetIndex, int domainIndex, int dim, double domain, double range, double plotX, double plotY) {
regionalize(datasetIndex, domainIndex, dim, domain, range, plotX, plotY);
}
public HashSet<RenderedPoint> getClickable(int plotX, int plotY) {
Bounds b = plot.getBounds();
String d = naturalize((plotX / b.width) * DOMAIN_REGIONS);
String r = naturalize((plotY / b.height) * RANGE_REGIONS);
return regions.get(d+","+r);
}