docs: public TupleTwo<Integer, Integer> findTile(double x1, double x2)
     {
        int t1 = 0;
        int t2 = 0;
        double xx1 = (x1 < 0) ? -x1 : x1;
        double xx2 = (x2 < 0) ? -x2 : x2;
        t1 = (xx1 < c1) ? 0 : ((int)Math.ceil((xx1-c1)/c2));
        t2 = (xx2 < b1) ? 0 : ((int)Math.ceil((xx2-b1)/b));
        if (x1 < 0) t1 = -(t1);
        if (x2 < 0) t2 = -(t2);
        
        return new TupleTwo<>(t1, t2);
     }