// where br is the cell we're calculating
function defineCount(br) {
    let c = 0;

    // br.x is the column number
    // br.y is the row number
    for (y = 0; y <= br.y; y++) { // loop through all rows above br (and the row br is on) 
        for (x = 0; x <= br.x; x++) { // loop through all columns to the left of br (and br column) 
            var i = x + n * y; // convert 2d array format to 1d index 
            if (t[i].s) { // if cell[i].status==true then increase count 
                c++;
            }
        }
    }
    return c;
}