3

使用标记时,我很难等待 D3 中的 ChartPlotter 显示自己。当然,我正在尝试绘制 Gazillion 记录(嗯,700,000 条记录)。当只使用一条线时,一切都很好(20 秒左右)。使用标记时,我们说的是 5 分钟。这是不可接受的。

有任何想法吗?

这是我所做的,下面有解释。

public static string MakeSimplePlot(double[][] xData, double[][] yData, string[] legend, string xAxisTitle, string yAxisTitle, bool[] showLines, bool[] showMarkers)
    {
        ChartPlotter plotter = new ChartPlotter();

        plotter.MainHorizontalAxis = new HorizontalAxis();
        plotter.MainVerticalAxis = new VerticalAxis();

        HorizontalAxisTitle horizontalAxisTitle = new HorizontalAxisTitle();
        horizontalAxisTitle.Content = xAxisTitle;
        plotter.AddChild(horizontalAxisTitle);

        VerticalAxisTitle verticalAxisTitle = new VerticalAxisTitle();
        verticalAxisTitle.Content = yAxisTitle;
        plotter.AddChild(verticalAxisTitle);

        Color[] plotColors = new Color[13] { Colors.Blue, Colors.Red, Colors.Green, Colors.Chartreuse, Colors.Yellow, Colors.Violet, Colors.Tan, Colors.Silver, Colors.Salmon, Colors.Lime, Colors.Brown, Colors.Chartreuse, Colors.DarkGray };

        for (int seriesCounter = 0; seriesCounter < legend.Count(); seriesCounter++)
        {
            DataFile clearedInputs = ClearExcess(new DataFile(xData[seriesCounter], yData[seriesCounter]));
            xData[seriesCounter] = clearedInputs.time;
            yData[seriesCounter] = clearedInputs.data;

            var xDataSource = new EnumerableDataSource<double>(xData[seriesCounter]);
            xDataSource.SetXMapping(x => x);

            var yDataSource = new EnumerableDataSource<double>(yData[seriesCounter]);
            yDataSource.SetYMapping(x => x);

            CompositeDataSource plotSeries = new CompositeDataSource(xDataSource, yDataSource);

            CirclePointMarker circlePointMarker = new CirclePointMarker();
            circlePointMarker.Fill = new SolidColorBrush(plotColors[seriesCounter]);
            circlePointMarker.Pen = new Pen(circlePointMarker.Fill, 0);

            circlePointMarker.Size = (showMarkers[seriesCounter] == false) ? 0 : 8;
            int lineWidth = (showLines[seriesCounter] == false) ? 0 : 2;

            if (showMarkers[seriesCounter] == false)
            {
                plotter.AddLineGraph(plotSeries, new Pen(circlePointMarker.Fill, lineWidth), new PenDescription("Dummy"));
            }
            else
            {
                plotter.AddLineGraph(plotSeries, new Pen(circlePointMarker.Fill, lineWidth), circlePointMarker, new PenDescription("Dummy"));
            }
        }

        UIParameters.plotWindow.mainGrid.Children.Clear();
        UIParameters.plotWindow.mainGrid.RowDefinitions.Clear();
        UIParameters.plotWindow.mainGrid.Children.Add(plotter);
        plotter.Viewport.FitToView();

        plotter.LegendVisible = false;
        plotter.NewLegendVisible = false;            

        if (legend.Count() > 1)
        {
            ShowLegend(legend, plotColors);
        }

        UIParameters.plotWindow.WindowState = WindowState.Minimized;
        UIParameters.plotWindow.WindowState = WindowState.Normal;

        string filename = Path.ChangeExtension(Path.GetTempFileName(), "png");

        RenderTargetBitmap targetBitmap = new RenderTargetBitmap((int)UIParameters.plotWindow.mainGrid.ActualWidth, (int)UIParameters.plotWindow.mainGrid.ActualHeight, 96d, 96d, PixelFormats.Default);
        targetBitmap.Render(UIParameters.plotWindow.mainGrid);
        PngBitmapEncoder encoder = new PngBitmapEncoder();
        encoder.Frames.Add(BitmapFrame.Create(targetBitmap));
        using (var fileStream = File.Open(filename, FileMode.OpenOrCreate))
        {
            encoder.Save(fileStream);
            UIParameters.plotWindow.mainGrid.Clip = null;

            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();

            targetBitmap.Freeze();

            if (targetBitmap != null) targetBitmap.Clear();
            targetBitmap = null;
            GC.Collect();
            GC.WaitForPendingFinalizers();

            GC.Collect();
            GC.WaitForPendingFinalizers();
        }

        return filename;
    }

说明:

  1. 我隐藏了绘图仪图例并使用 ShowLegend 制作我自己的图例,因为图例不显示它是否只有标记(我错了吗?)
  2. 我最小化和最大化绘图窗口,否则绘图不会更新,或者它更新但没有保存到文件中。如果我移动窗口(我猜是某种重绘事件),这也有效,但由于该过程是自动的,因此用户没有任何交互。我尝试无效,无济于事。想法?

谢谢!

4

2 回答 2

3

我编写了自己的类来隐藏标记,当它们不在屏幕上时。当屏幕上没有大量标记时,它是一种虚拟化技术,可将性能提高十倍。它看起来像这样:

using System;
using System.Windows;
using System.Windows.Media;
using Microsoft.Research.DynamicDataDisplay.DataSources;
using Microsoft.Research.DynamicDataDisplay.PointMarkers;
using Microsoft.Research.DynamicDataDisplay.Common;

namespace Microsoft.Research.DynamicDataDisplay.Charts {
public class FilteredMarkerPointsGraph : MarkerPointsGraph {
    public FilteredMarkerPointsGraph()
        : base() {
        ;
    }

    public FilteredMarkerPointsGraph(IPointDataSource dataSource)
        : base(dataSource) {
        ;
    }

    protected override void OnRenderCore(DrawingContext dc, RenderState state) {
        // base.OnRenderCore
        if (DataSource == null) return;
        if (Marker == null) return;

        var left = Viewport.Visible.Location.X;
        var right = Viewport.Visible.Location.X + Viewport.Visible.Size.Width;
        var top = Viewport.Visible.Location.Y;
        var bottom = Viewport.Visible.Location.Y + Viewport.Visible.Size.Height;

        var transform = Plotter2D.Viewport.Transform;

        DataRect bounds = DataRect.Empty;
        using (IPointEnumerator enumerator = DataSource.GetEnumerator(GetContext())) {
            Point point = new Point();
            while (enumerator.MoveNext()) {
                enumerator.GetCurrent(ref point);                                       

                if (point.X >= left && point.X <= right && point.Y >= top && point.Y <= bottom)
                {
                    enumerator.ApplyMappings(Marker);

                    Point screenPoint = point.DataToScreen(transform);

                    bounds = DataRect.Union(bounds, point);
                    Marker.Render(dc, screenPoint);
                }
            }
        }

        Viewport2D.SetContentBounds(this, bounds);
    }
}

确保在 XAML 中调用 FilteredMarkerPointsGraph 而不是 MarkerPointsGraph!

编辑

  1. 我不确定带有标记的图例需要什么,我实际上并没有在我的任何图表中使用图例,但您的解决方案似乎很好。

  2. 重新绘制情节实际上很容易。

我发现做到这一点的最佳方法是在您的代码中包含一个表示 DataSource 的属性并将图表的 DataSource 绑定到该属性。每次更新或重新分配数据源时,让您的代码实现 INotifyPropertyChanged 并调用 OnPropertyChanged。这将迫使绘图仪观察绑定并重新绘制图表。

例子:

EnumerableDataSource<Point> m_d3DataSource;
public EnumerableDataSource<Point> D3DataSource {
get {
    return m_d3DataSource;
}
set {                
    //you can set your mapping inside the set block as well             
    m_d3DataSource = value;
    OnPropertyChanged("D3DataSource");
}
}     

protected void OnPropertyChanged(PropertyChangedEventArgs e) {
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null) {
        handler(this, e);
    }
} 

protected void OnPropertyChanged(string propertyName) {
    OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}  

关于你的标记的表现.. 很难准确指出导致你的表现问题的原因,但我的建议是尝试使用不同的数据源。我一直在使用 EnumerableDataSource,它总是很有效。尝试将您的数据引入单个对象并在您的设置块中设置映射,如上所示,使用:

value.SetYMapping(k => Convert.ToDouble(k.yData));
value.SetXMapping(k => Convert.ToDouble(k.xData));

您唯一需要担心的是 Enumerable 数据源中的映射,D3 应该为您处理其余的事情。

于 2012-11-14T14:34:35.293 回答
1

当您显示“Gazillion”点时,用户可能看不到标记:当缩放级别更合理时,您不能将模式从线切换到标记吗?

于 2012-11-14T11:50:18.043 回答