相交 - 两矩形，两圆是否相交

注意：这边的矩形不带旋转

 

两圆是否相交

  

//两圆是否相交
public static bool IsTwoCircleIntersect(Vector2 center1, float r1, Vector2 center2, float r2)
{
    var r = r1 + r2;
    var result = (center1 - center2).sqrMagnitude <= r * r;
    return result;
}

 

两矩形是否相交

  

//两矩形是否相交
public static bool IsTwoRectIntersect(Vector2 min1, Vector2 max1, Vector2 min2, Vector2 max2)
{
    if (max1.x < min2.x || min1.x > max2.x || max1.y < min2.y || min1.y > max2.y)
        return false;
    return true;
}