WPF 折线/坐标点的绘制 基于序列重要点的时间序列分割算法代码实现

   public class SIP
        {
        
            public static double Distance(Point start, Point end, Point x)
            {
                double restult = Math.Abs(start.Y + (end.X - start.X) * ((x.X - start.X) / (end.X - start.X)) - x.Y);
                return restult;
            }

            public static void Segment(List<Point> list, int start, int end, double e, ref List<int> ns)
            {
               
                double maxvalue = 0;
                int index = 0;
                for (int i = start; i < end; i++)
                {
                    var val = Distance(list[start], list[end], list[i]);
                    //和DP一样的过程，具体计算不太一样
                    if (val > maxvalue)
                    {
                        maxvalue = val;
                        index = i;
                    }
                }
                if (maxvalue > e && index != 0)
                {
                    ns.Add(index);
                    //遍历添加
                    Segment(list, start, index, e, ref ns);
                    Segment(list, index, end, e, ref ns);
                }

              
            }
    
            public static List<Point> BSIP(List<Point> list, double e)
            {
                List<Point> BSIPList = new List<Point>();

                List<int> ns = new List<int>();
                //默认添加首点和尾点
                BSIPList.Add(list[0]);
                //遍历分割
                Segment(list, 0, list.Count - 1, e, ref ns);
                ns.Sort();
                foreach (var item in ns)
                {
                    BSIPList.Add(list[item]);
                }
                //默认添加首点和尾点
                BSIPList.Add(list.Last());
                return BSIPList;
            }
        }