相关疑难解决方法(0)

我有以下内容:

bool AreNear(Point Old, Point Current)
{
    int x1 = Convert.ToInt32(Old.X);
    int x2 = Convert.ToInt32(Current.X);
    int y1 = Convert.ToInt32(Old.Y);
    int y2 = Convert.ToInt32(Current.Y);
    if (x1 == x2) {
        if (y1 == y2) {
            return true;
        }
    }
    return false;
}

如果当前点位于旧点的25像素半径内,我想在函数中返回true.谁能告诉我怎么做？