NPlot是.Net平臺下開源的圖表控制元件，包括K線圖、柱狀圖、餅圖、曲線圖、散點圖等。這裡主要講講怎麼利用NPlot實現股票K線圖。NPlot中PlotSurface2D物件是整個NPlot的圖表的容器，所有的圖表都需要新增到PlotSurface2D中才能進行顯示。在WinForm程式中我們引用的是Windows.PlotSurface2D類，此類整合自Control。這裡利用的K線圖資料來自OKEX比特幣交易的日線資料。主要包括時間、開盤價、最高價、最低價、收盤價等資料。資料儲存資料庫中的，Nplot提供資料來源繫結功能，通過資料庫查詢查出的DataTable物件可以直接繫結到蠟燭物件上。

PlotSurface2D初始化：

private void InitKLinePS()
        {
            KLinePS = new NPlot.Windows.PlotSurface2D();
            this.KLinePS.AutoScaleAutoGeneratedAxes = true;
            this.KLinePS.AutoScaleTitle = false ;
            this.KLinePS.DateTimeToolTip = true;            
            this.KLinePS.DateTimeToolTip = true;
            this.KLinePS.Legend = null;
            this.KLinePS.LegendZOrder = -1;
            this.KLinePS.Location = new System.Drawing.Point(0, 0);
            this.KLinePS.Name = "costPS";
            this.KLinePS.RightMenu = null;
            this.KLinePS.Padding = 10;
            //滑鼠tooltips 時間+價格
            this.KLinePS.ShowCoordinates = true;
            this.KLinePS.Size = new System.Drawing.Size(969, 595);
            this.KLinePS.Width = 1300;
            this.KLinePS.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
            this.KLinePS.TabIndex = 2;
            this.KLinePS.Title = "123";
            this.KLinePS.TitleFont = new System.Drawing.Font("Arial", 14F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Pixel);
           
        }
 

SetCandlePlot方法為類的外部呼叫方法，包括K線資料查詢、CandlePlot物件建立、資料來源繫結及把CandlePlot物件新增到PlotSurface2D中去，最後通過PlotSurface2D的Refresh重新整理顯示。

 public void SetCandlePlot(string klineTable, string startTime, string endTime, Dictionary<int, GridStrategyEntity> dicGridStrategyEntity, DataTable backTestResult)
        {
            string sql;
            dicAutoGridStrategy = dicGridStrategyEntity;
            this.backTestResult = backTestResult;
            backTestStartTime = startTime;
            backTestEndTime = endTime;
           // dealedCount = 0;
            sql = "select * from " + klineTable + "kline where datetime>#" + startTime + "#" + " and datetime<#"
                + endTime + "# order by datetime asc";
            DataTable dt = oleDbHelper.queryDataForDataTable(sql);
            CandlePlot cp = new CandlePlot();
            cp.DataSource = dt;
            cp.AbscissaData = "datetime";
            cp.OpenData = "open";
            cp.LowData = "low";
            cp.HighData = "high";
            cp.CloseData = "close";
            cp.Label = "蠟燭圖";
            //開跌色
            cp.BearishColor = System.Drawing.Color.FromArgb(255, 255, 0, 0);
            //看漲色
            cp.BullishColor = System.Drawing.Color.FromArgb(255, 0, 255, 0);
            cp.Style = CandlePlot.Styles.Filled;
           //K線寬度
            cp.StickWidth = 4;            
            this.KLinePS.Add(cp);            
            //隱藏日期刻度標示
            this.KLinePS.XAxis1.HideTickText = true ;
            this.KLinePS.Refresh();            
        }