public static LineFr Vertical(Fraction x) { var p = new PointFr(x, Fraction.Zero); return(new LineFr(p, p.Translate(0, 1))); }
public static LineFr Horizontal(Fraction y) { var p = new PointFr(Fraction.Zero, y); return(new LineFr(p, p.Translate(1, 0))); }