public ArrayList<String> generateObsAt(DataSequence seq, int pos) { ArrayList<String> obs = new ArrayList<String>(); CharDetails cd = (CharDetails) seq.x(pos); for (int r = 0; r < CharDetails.ROWS; r++) { for (int c = 0; c < CharDetails.COLS; c++) { if (cd.getPixels(r, c) != 0) { obs.add(r + "." + c); } } } return obs; }