//判断两条线段是否相交
bool judgep(point a, point b, point c, point d)
{
return a,b在cd直线两边 && c,d在ab直线两边;
}
//判断矩形相交
bool judger(rect r1, rect r2)
{
//通过(x1,y1),(x2,y2),d计算出矩形四个点
四条边每两条线段判断是否相交;
}
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