c# chart控件添加边界值线条以及扩展性功能

 //最大线条
                        double max = ammeter.Max();
                        StripLine stripMax = new StripLine();
                        stripMax.Text = string.Format("最大：{0:F}", max);//展示文本
                        stripMax.BackColor = Color.FromArgb(208, 109, 106);//背景色
                        stripMax.Interval = 0;//间隔
                        stripMax.IntervalOffset = max;//偏移量
                        stripMax.StripWidth = 0.001;//线宽
                        stripMax.ForeColor = Color.White;//前景色
                        stripMax.TextAlignment = StringAlignment.Near;//文本对齐方式
                        chartInfo.ChartAreas["ammeter"].AxisY.StripLines.Add(stripMax);//添加到ChartAreas中

  Point lastPoint = new Point();//上次点的坐标
        ToolTip tp = new ToolTip();//tooltip展示条
        //绘制竖线坐标
        Point p1 = new Point(0, 0);
        Point p2 = new Point(0, 0);
        /// 

        /// 鼠标移动事件
        /// 
        /// 
        /// 
        private void chartInfo_MouseMove(object sender, MouseEventArgs e)
        {
            this.Refresh();//刷新chart，使用clear会使chart上的图形完全清空
            Pen pen = new Pen(Color.Yellow);
            Graphics g = chartInfo.CreateGraphics();
            string seriesInfo = ""; //tooltip文本
            if (e.Location != lastPoint)//如果在上次点的位置不进行操作,此处操作会引发chart控件的refresh操作造成界面闪烁
            {
                for (int y = 0; y //线条范围进行碰撞检测
                {
                    HitTestResult result = chartInfo.HitTest(e.X, y);
                    if (result.ChartElementType == ChartElementType.DataPoint)
                    {
                        foreach (DataPoint dpp in result.Series.Points)//数据点默认样式 使用索引的方式修改偶尔会出现无法正常修改完
                        {
                            dpp.MarkerStyle = MarkerStyle.Diamond;
                            dpp.MarkerColor = Color.White;
                            dpp.MarkerSize = 5;
                        }
                        int i = result.PointIndex;
                        DataPoint dp = result.Series.Points[i];
                        dp.MarkerStyle = MarkerStyle.Star4;//捕获到数据点的样式
                        dp.MarkerColor = Color.Orange;
                        dp.MarkerSize = 15;
                        //获取数据点的相对坐标
                        p1 = new Point((int)chartInfo.ChartAreas["ammeter"].AxisX.ValueToPixelPosition(dp.XValue), 0);
                        p2 = new Point((int)chartInfo.ChartAreas["ammeter"].AxisX.ValueToPixelPosition(dp.XValue), chartInfo.Size.Height);
                        seriesInfo = string.Format("分项:{0}  时间:{1}  能耗值:{2}", result.Series.LegendText, DateTime.FromOADate(dp.XValue), dp.YValues[0]);
                        break;
                    }
                }
                tp.AutoPopDelay = 5000;//展示tooltip
                tp.ShowAlways = false;
                tp.IsBalloon = true;
                tp.SetToolTip(chartInfo, seriesInfo);
            }
            lastPoint = e.Location;//记录本次位置
            g.DrawLine(pen, p1, p2);//绘制竖线
        }