C# 判断两个矩形是都相交

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public static bool IsInRectangle(Point point, Point[] rect)
{
var pa = point - rect[0];
var pb = point - rect[1];
var pc = point - rect[2];
var pd = point - rect[3];

var ab = Math.Sign(Vector.CrossProduct(pa, pb));
var bc = Math.Sign(Vector.CrossProduct(pb, pc));
var cd = Math.Sign(Vector.CrossProduct(pc, pd));
var da = Math.Sign(Vector.CrossProduct(pd, pa));

return (ab == da &&bc ==cd && cd == da);

}

return rect2.Any(item => IsInRectangle(item , rect));