public List<SelectionDetail> getSelectionDetailsAtIndex(int xIndex) {
List<SelectionDetail> vals = new ArrayList<>();
for (int i = 0; i < mData.getDataSetCount(); i++) {
DataSet<?> dataSet = mData.getDataSetByIndex(i);
// extract all y-values from all DataSets at the given x-index
final float yVal = dataSet.getYValForXIndex(xIndex);
if (yVal == Float.NaN) continue;
vals.add(new SelectionDetail(yVal, i, dataSet));
}
return vals;
}
