WPF 记一个特别简单的点集滤波平滑方法

ptPixelLocation

Type: POINT

The predicted screen coordinates of the pointer, in pixels.

The predicted value is based on the pointer position reported by the digitizer and the motion of the pointer. This correction can compensate for visual lag due to inherent delays in sensing and processing the pointer location on the digitizer. This is applicable to pointers of type PT_TOUCH. For other pointer types, the predicted value will be the same as the non-predicted value (see ptPixelLocationRaw).

    public static List<double> ApplyMeanFilter(List<double> list, int step)
    {
        var newList = new List<double>(list.Take(step / 2));
        for (int i = step / 2; i < list.Count - step + step / 2; i++)
        {
            newList.Add(list.Skip(i - step / 2).Take(step).Sum() / step);
        }
        newList.AddRange(list.Skip(list.Count - (step - step / 2)));
        return newList;
    }

    public static List<Point> ApplyMeanFilter(List<Point> pointList, int step = 10)
    {
        var xList = ApplyMeanFilter(pointList.Select(t => t.X).ToList(), step);
        var yList = ApplyMeanFilter(pointList.Select(t => t.Y).ToList(), step);

        var newPointList = new List<Point>();
        for (int i = 0; i < xList.Count && i < yList.Count; i++)
        {
            newPointList.Add(new Point(xList[i], yList[i]));
        }

        return newPointList;
    }

    public MainWindow()
    {
        InitializeComponent();

        Loaded += MainWindow_Loaded;
    }

    private void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        var file = "output.txt";
        var lines = System.IO.File.ReadAllLines(file);
        var pointList = new List<Point>();
        foreach (var line in lines)
        {
            var match = Regex.Match(line, @"(\d+),(\d+)");
            if (match.Success)
            {
                pointList.Add(new Point(double.Parse(match.Groups[1].ValueSpan), double.Parse(match.Groups[2].ValueSpan)));
            }
        }

        var applyMeanFilter = ApplyMeanFilter(pointList);

        var polyline = new Polyline();
        polyline.Stroke = Brushes.Black;
        polyline.StrokeThickness = 2;
        polyline.Points = new PointCollection(applyMeanFilter);

        RootCanvas.Children.Add(polyline);
    }

git init
git remote add origin https://gitee.com/lindexi/lindexi_gd.git
git pull origin 68654061ac8cced2abe6736141c37bbb6303ccdb

git remote remove origin
git remote add origin https://github.com/lindexi/lindexi_gd.git
git pull origin 68654061ac8cced2abe6736141c37bbb6303ccdb