Scottplot5的一些使用心得

目前效果,转出来的效果不咋地

思路就是拿到所有的记录器中的数据然后使用库的api得到相应点数据点,最后渲染上去,代码在下方

鼠标 移动方法

 private void Myplot_MouseMove(object sender, MouseEventArgs e)
 {
     if (PressDatalogger.Data.CountTotal == 0 || PressDatalogger.Data.CountTotal == 0 || PressDatalogger.Data.CountTotal == 0)
         return;

     Pixel mousePixel = new(e.GetPosition(MyPlot).X, e.GetPosition(MyPlot).Y);
     Coordinates pressPoint = MyPlot.Plot.GetCoordinates(mousePixel, null, PressDatalogger.Axes.YAxis);
     Coordinates posPoint = MyPlot.Plot.GetCoordinates(mousePixel, null, PostionDatalogger.Axes.YAxis);
     Coordinates speedPoint = MyPlot.Plot.GetCoordinates(mousePixel, null, SpeedDatalogger.Axes.YAxis);
     var pressPointnearest = GetNearestPoint(PressDatalogger, pressPoint);
     var posPointnearest = GetNearestPoint(PostionDatalogger, posPoint);
     var speedPointnearest = GetNearestPoint(SpeedDatalogger, speedPoint);
     CheckSelectSerier();
     MyCrosshair.Position = speedPointnearest.Coordinates;
     MyCrosshair.Axes = PressDatalogger.Axes;
 
     UpdateHighlightedPoint(_speedSerierIscheck, SpeedHighlightedPoint, speedPointnearest, SpeedDatalogger);
     UpdateHighlightedPoint(_pressSerierIscheck, PressHighlightedPoint, pressPointnearest, PressDatalogger);
     UpdateHighlightedPoint(_positionSerierIscheck, PositionHighlightedPoint, posPointnearest, PostionDatalogger);
 }

 private DataPoint GetNearestPoint(DataLogger datalogger, Coordinates point)
 {
     ScatterSourceDoubleArray pointDoubleArray = new ScatterSourceDoubleArray(
         datalogger.Data.Coordinates.Select(c => c.X).ToArray(),
         datalogger.Data.Coordinates.Select(c => c.Y).ToArray()
     );
     return pointDoubleArray.GetNearestX(point, MyPlot.Plot.LastRender);
 }

 private void UpdateHighlightedPoint(bool isChecked, Marker highlightedPoint, DataPoint nearestPoint, DataLogger datalogger)
 {
     if (isChecked)
     {
         highlightedPoint.Location = nearestPoint.Coordinates;
         highlightedPoint.IsVisible = true;
         highlightedPoint.Axes.YAxis = datalogger.Axes.YAxis;
         highlightedPoint.Color = datalogger.LineColor;
         highlightedPoint.LegendText = datalogger.LegendText + nearestPoint.Y.ToString("F3");
     }
     else
     {
         highlightedPoint.IsVisible = false;
     }
 }

扩展方法:最开始需要鼠标点击后判断当前序列在哪个Y轴上,但是不好处理,写了个没啥用的扩展方法,关于如果获取位置点可以参考GitHub连接Updated: I want to display the value of the data point closest to the cursor. I see the problem. · ScottPlot/ScottPlot · Discussion #3847 · GitHub

 public static (bool state, Coordinates? coordinates) GetNearest(
     this DataLoggerSource dataLoggerSource,
     Coordinates mouseLocation,
     DataLogger dataLogger,
     float maxDistance = 2f
 )
 {
     float cX = (float)mouseLocation.X.ToThreeDecimal();
     float cY = (float)mouseLocation.Y.ToThreeDecimal();

     float minX = cX - 15;
     float maxX = cX + 15;

     float minY = cY - maxDistance;
     float maxY = cY + maxDistance;

     List<Coordinates> xCoordinates = new List<Coordinates>();

     var point = dataLogger.Data.Coordinates.FirstOrDefault(p => p.X >= minX && p.X <= maxX && p.Y >= minY && p.Y <= maxY);
     if (point.X > 0 && point.Y > 0)
     {
         return (true, point);
     }
     return (false, null);
 }