#include<stdio.h>
#include<math.h>
#define eps 1e-8
#define zero(x) (((x)>0?(x):-(x))<eps)
struct point{double x,y}
//计算交叉乘积(P1-P0)x(P2-P0)
double xmult(point p1,point p2,point p0){
return (p1.x-p0.x)*(p2.y-p0.y)-(p2.x-p0.x)*(p1.y-p0.y)
}
//判点是否在线段上,包括端点
int dot_online_in(point p,point l1,point l2){
return zero(xmult(p,l1,l2))&&(l1.x-p.x)*(l2.x-p.x)<eps&&(l1.y-p.y)*(l2.y-p.y)<eps
}
//判两点在线段同侧,点在线段上返回0
int same_side(point p1,point p2,point l1,point l2){
return xmult(l1,p1,l2)*xmult(l1,p2,l2)>eps
}
//判两直线平行
int parallel(point u1,point u2,point v1,point v2){
return zero((u1.x-u2.x)*(v1.y-v2.y)-(v1.x-v2.x)*(u1.y-u2.y))
}
//判三点共线
int dots_inline(point p1,point p2,point p3){
return zero(xmult(p1,p2,p3))
}
//判两线段相交,包括端点和部分重合
int intersect_in(point u1,point u2,point v1,point v2){
if (!dots_inline(u1,u2,v1)||!dots_inline(u1,u2,v2))
return !same_side(u1,u2,v1,v2)&&!same_side(v1,v2,u1,u2)
return dot_online_in(u1,v1,v2)||dot_online_in(u2,v1,v2)||dot_online_in(v1,u1,u2)||dot_online_in(v2,u1,u2)
}
//计算两线段交点,请判线段是否相交(同时还是要判断是否平行!)
point intersection(point u1,point u2,point v1,point v2){
point ret=u1
double t=((u1.x-v1.x)*(v1.y-v2.y)-(u1.y-v1.y)*(v1.x-v2.x))
/((u1.x-u2.x)*(v1.y-v2.y)-(u1.y-u2.y)*(v1.x-v2.x))
ret.x+=(u2.x-u1.x)*t
ret.y+=(u2.y-u1.y)*t
return ret
}
int main(void)
{
point u1,u2,v1,v2,ans
printf("请输入线段1的两个端点:\n")
scanf("%lf%lf%lf%lf",&u1.x,&u1.y,&u2.x,&u2.y)
printf("请输入线段2的两个端点:\n")
scanf("%lf%lf%lf%lf",&v1.x,&v1.y,&v2.x,&v2.y)
if (parallel(u1,u2,v1,v2)||!intersect_in(u1,u2,v1,v2)){
printf("无交点!\n")
}
else{
ans=intersection(u1,u2,v1,v2)
printf("交点为:(%lf,%lf)",ans.x,ans.y)
}
return 0
}
看看有没有相交计算两个线段起始点和结束点上的点的坐标
if (a.起始点y坐标b.结束点Y坐标) :
不相交
else
相交