pure interface of class Constraints

public class Constraints
  extends Printable
{
    public final FontMetrics fm;
    public int varCount;
    public ConstraintVector above;
    public ConstraintVector below;
    public Constraints(FontMetrics fm);
    public void print(Printer p);
    public Solution solve();
    public int newVVar();
    public int newHVar();
    public boolean isHorizontal(int x);
    public void gap0(int x,
                     int y);
    public void gap1(int x,
                     int y);
    public void gap2(int x,
                     int y);
    public void gapStringWidth(String s,
                               int x,
                               int y);
    public void gapStringHeight(String s,
                                int x,
                                int y);
}