//丟入牆壁起末點 public void Add_New_Wall(PointF p1,PointF p2) { Wall new_wall = new Wall(); new_wall.start.X = p1.X; new_wall.start.Y = p1.Y; new_wall.end.X = p2.X; new_wall.end.Y = p2.Y; new_wall.Cal_Equation(); Mywall.Add(new_wall); }