WPF工具包图表无序行系列

问题描述

默认LineSeries实现按独立值对数据点排序。这给出了像这样的数据的奇怪结果：

The default LineSeries implementation orders data points by independed value. This gives me strange results for data like this:

是否可以绘制一个线序列，其中在原始顺序的点之间绘制线？

Is it possible to plot a line series where lines are drawn between the points in the original order?

推荐答案

我目前通过继承LineSeries解决这个问题：

I currently solved this by inheriting from LineSeries:

class UnorderedLineSeries : LineSeries
{
    protected override void UpdateShape()
    {
        double maximum = ActualDependentRangeAxis.GetPlotAreaCoordinate(
            ActualDependentRangeAxis.Range.Maximum).Value;

        Func<DataPoint, Point> PointCreator = dataPoint =>
            new Point(
                ActualIndependentAxis.GetPlotAreaCoordinate(
                dataPoint.ActualIndependentValue).Value,
                maximum - ActualDependentRangeAxis.GetPlotAreaCoordinate(
                dataPoint.ActualDependentValue).Value);

        IEnumerable<Point> points = Enumerable.Empty<Point>();
        if (CanGraph(maximum))
        {
            // Original implementation performs ordering here
            points = ActiveDataPoints.Select(PointCreator);
        }
        UpdateShapeFromPoints(points);
    }

    bool CanGraph(double value)
    {
        return !double.IsNaN(value) &&
            !double.IsNegativeInfinity(value) &&
            !double.IsPositiveInfinity(value) &&
            !double.IsInfinity(value);
    }
}

结果：

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