C#下利用开源NPlot绘制股票十字交叉线

在数字货币或者股票看盘交易软件中，为了方便准确定位K线图中的时间和买卖点，都用到了用十字交叉线来定位买卖时间和买卖点。这里利用.Net下开源的NPlot图表插件，实现了跟着鼠标移动的十字定位交叉线，并能做到根据屏幕坐标转化为时间和买卖点坐标。这里通过在K线图上双击创建交叉十字线，十字线跟着鼠标移动而移动，并且实时获取移动的位置。效果如下：

主要代码实现包括PlotSurface2D（PlotSurface2D为NPlot控件中的容器类）创建及初始化、PlotSurface2D鼠标双击及移动的事件绑定及代码实现，HorizontalLine横线、VerticalLine竖线的声明和创建。详细代码如下：

PlotSurface2D的声明及初始化：

private NPlot.Windows.PlotSurface2D KLinePS;

 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 = 1;
           
            //鼠标tooltips 时间+价格
            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);

        }

HorizontalLine横线、VerticalLine竖线的声明，这里只是声明，具体的创建包括在鼠标双击事件中： 

VerticalLine lineCrossX;// = new VerticalLine(10);
        HorizontalLine lineCrossY;// = new HorizontalLine(10);

鼠标事件的绑定： 

 KLinePS.MouseMove += new System.Windows.Forms.MouseEventHandler(KLinePS_MouseMove);
            KLinePS.MouseDoubleClick += new System.Windows.Forms.MouseEventHandler(KLinePS_MouseDoubleClick);

鼠标双击事件的实现：

private void KLinePS_MouseDoubleClick(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            System.Drawing.Point here = new System.Drawing.Point(e.X, e.Y);
            //屏幕坐标转化为业务坐标
            double x = this.KLinePS.PhysicalXAxis1Cache.PhysicalToWorld(here, true);
            double y = this.KLinePS.PhysicalYAxis1Cache.PhysicalToWorld(here, true);
            DateTime dateTime = new DateTime((long)x);
            //水平线创建
            lineCrossY = new HorizontalLine(y);
            lineCrossY.LengthScale = 0.89f;
            lineCrossY.OrdinateValue = y;
            lineCrossY.Pen = Pens.Green;
            //line.OrdinateValue = 2;
            this.KLinePS.Add(lineCrossY);
              ///垂直线///
            lineCrossX = new VerticalLine(x);
            lineCrossX.LengthScale = 0.89f;
            lineCrossX.Pen = Pens.Red;
            lineCrossX.AbscissaValue = x;
            this.KLinePS.Add(lineCrossX);            
            this.KLinePS.Refresh();
        }

鼠标移动事件的实现：

private void KLinePS_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (this.KLinePS.PhysicalXAxis1Cache == null || this.KLinePS.PhysicalYAxis1Cache == null)
                return;
            System.Drawing.Point here = new System.Drawing.Point(e.X, e.Y);
            double x = this.KLinePS.PhysicalXAxis1Cache.PhysicalToWorld(here, true);
            double y = this.KLinePS.PhysicalYAxis1Cache.PhysicalToWorld(here, true);
            if (lineCrossY != null && lineCrossX != null)
            {
                lineCrossY.OrdinateValue = y;
                lineCrossX.AbscissaValue = x;
            }
            this.KLinePS.Refresh();
        }