找到最近的项目/指向鼠标位置

Question

是否有某种优化方法可以获得最接近鼠标点的点？

以下是我的代码..

基本上我有一个有点集合的集合..有没有更好的方法可以解决这个问题？

谢谢..

            double nearestDist = Snap.radius;
            Point nearestPoint = new Point(clickPoint.X, clickPoint.Y);
            Point lastpt = activeItem.pc.LastOrDefault();

            drawCollection.ToList().ForEach(t =>
            {
                t.pc.ToList().ForEach(p => {

                    Point pt = p;
                    if (!lastpt.Equals(pt) || !activeItem.Equals(t))
                    {
                        double dist = (Math.Abs(clickPoint.X - pt.X) + Math.Abs(clickPoint.Y - pt.Y)) / 2;

                        if (dist > 0 && dist <= nearestDist && dist <= Snap.radius)
                        {
                            nearestDist = dist;
                            nearestPoint = pt;
                            DoubleSnapItem = t;
                        }
                    }

                });
            });