/**
* Adds a box to the relevant list based on its position tag.
*
* @param box
*/
public void setColumn(Box box) {
if (box.getColumn() == 1) left.add(box);
else if (box.getColumn() == 2) middle.add(box);
else right.add(box);
}
private void insert(Box n, ArrayList<Box> a, int i) {
for (;
i > 0 && ((Comparable<Integer>) a.get(i - 1).getPosition()).compareTo(n.getPosition()) > 0;
i--) a.set(i, a.get(i - 1));
a.set(i, n);
}