Introduction - If you have any usage issues, please Google them yourself
Parameters:
p1~p4:直线上不相同的两点
P1 ~ P4: two points in a straight line.
*p:通过指针返回结果
*p: the result is returned by the pointer.
返回值:1:两直线相交;2:两直线平行
Return value: 1: two straight line two: 2
如需要判断两线段交点,检验k 和对应k 1(注释中)的值是否在0~1 之间,用在0~1
If you need to judge the intersection of two line segments, test K and the value of the corresponding K 1 (notes) is between 1 to 0, with the 0 to 1
之间的那个求交点
Between the intersection