10x10 grid give 100交点
find 1交点on two opposite edges. draw the last line through these 2交点. Make sure not hit any other 交点 or simply pick up 2 corner points of biggest rectangle that is made by two adjacent parallel lines.
find 1交点on two opposite edges. draw the last line through these 2交点. Make sure not hit any other 交点 or simply pick up 2 corner points of biggest rectangle that is made by two adjacent parallel lines.