public IntLine(int xx1, int yy1, int xx2, int yy2) { x1 = xx1; y1 = yy1; x2 = xx2; y2 = yy2;
public IntLine(IntLine l) { x1 = l.x1; y1 = l.y1; x2 = l.x2; y2 = l.y2; length = new PathLength(l.x1, l.y1, l.x2, l.y2);
    public IntLine(int xx1, int yy1, int xx2, int yy2) {        x1 = xx1;        y1 = yy1;        x2 = xx2;        y2 = yy2;    }