Question

我有一个用户的血压数据，并希望使用Oxyplot进行绘图。有收缩压值，舒张压值和代表测试日期的日期。

我有点坚持如何在一个数据点中表示血压的2个值，而不是月变量，因为数据点只需要2个变量。

这是我的代码：

 plotModel = new PlotModel { Title = "Blood Presure" };
 plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Left,AbsoluteMaximum = 190, Maximum = 190,AbsoluteMinimum = 10, Minimum = 10, Title = "Diastolic" });
 plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom,AbsoluteMaximum = 12, Maximum = 12,AbsoluteMinimum = 1, Minimum = 1, MajorStep = 1, Title = "Month" });
 plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Top, AbsoluteMaximum = 190, Maximum = 190, AbsoluteMinimum = 10, Minimum = 10, Title = "Systolic" });

var series2 = new LineSeries
{
    MarkerType = MarkerType.Circle,
    MarkerSize = 4,
    MarkerStroke = OxyColors.White

};

if (userInfo != null)
    {
        if (userInfo.Count > 0)
        {
            var counter = 0.00;

            foreach (Info healthData in userInfo)
                {
                    var bp = healthData.BloodPressure;

                    var date = healthData.CreatedDate;

                    var month = date.Month;

                    if (dateLabel != null)
                    {
                        dateLabel.Text = month.ToString();

                    }

                        // TODO Split this blood pressure value

                    var result = Regex.Split(bp,"/");

                    string systolicValue = null;
                    string diastolicValue = null;

                    if (result.Length > 1)
                    {
                        systolicValue = result[0];
                        diastolicValue = result[1];
                    }


                    series2.Points.Add(new DataPoint(month + counter, double.Parse(systolicValue)));

                    counter += 0.02;

                    }

如何在图表上最好地表示这些值？这是我目前的图表屏幕截图：

Answer 1

您的数据是三维的。您可以在3D图表上表示它们（只要我知道OxyPlot不支持）。另一种选择是绘制散点图并将其中一个尺寸显示为点的大小（和/或颜色）：

        //Data:
        int n = 10;
        var dia = new double[10] {1,3,3,4,4,2,4,5,6,4 };
        var sys = new double[10] {2,2,2,4,5,3,4,4,5,6 };
        var mon = Enumerable.Range(1, n).ToArray(); 

        var model = new PlotModel { Title = "ScatterSeries" };
        var scatterSeries = new OxyPlot.Series.ScatterSeries { MarkerType = MarkerType.Circle };
        for (int i = 0; i < n; i++)
        {
            var x = mon[i];
            var y = sys[i];
            var size = dia[i];
            scatterSeries.Points.Add(new OxyPlot.Series.ScatterPoint(x, y, size, size));
        } 
        model.Series.Add(scatterSeries);
        model.Axes.Add(new OxyPlot.Axes.LinearColorAxis { Position = OxyPlot.Axes.AxisPosition.Right, Palette = OxyPalettes.BlueWhiteRed(30) });
        model.Axes.Add(new OxyPlot.Axes.LinearAxis { Position = OxyPlot.Axes.AxisPosition.Bottom });
        model.Axes.Add(new OxyPlot.Axes.LinearAxis { Position = OxyPlot.Axes.AxisPosition.Left });
        var plot = new OxyPlot.Wpf.PlotView() { Model = model };
        this.Content = plot;

Answer 2

我找到了一个更简单的解决方案，通过使用PointAnnotations来捕获所有三组数据：

plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Left,AbsoluteMaximum = 190, Maximum = 190,AbsoluteMinimum = 70, Minimum = 70, Title = "Systolic" });
plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom, AbsoluteMaximum = 190, Maximum = 190, AbsoluteMinimum = 40, Minimum = 40, Title = "Diastolic" });

var series2 = new LineSeries
{
MarkerType = MarkerType.Circle,
MarkerSize = 4,
MarkerStroke = OxyColors.White

;

if (userInfo != null)
{
    if (userInfo.Count > 0)
    {
        var counter = 0.00;

        foreach (Info healthData in userInfo)
            {
                var bp = healthData.BloodPressure;

                var date = healthData.CreatedDate;

                var month = date.Month;

                if (dateLabel != null)
                {
                    dateLabel.Text = month.ToString();

                }

                    // TODO Split this blood pressure value

                var result = Regex.Split(bp,"/");

                string systolicValue = null;
                string diastolicValue = null;

                if (result.Length > 1)
                {
                    systolicValue = result[0];
                    diastolicValue = result[1];
                }


                series2.Points.Add(new DataPoint(double.Parse(diastolicValue), double.Parse(systolicValue)));

                var pointAnnotation1 = new PointAnnotation();  
                pointAnnotation1.X = Convert.ToDouble(diastolicValue);
                pointAnnotation1.Y = Convert.ToDouble(systolicValue);
                pointAnnotation1.Text = String.Format("{0}",date.ToString("MM/dd/yyyy")); // I'm adding the date label here
                plotModel.Annotations.Add(pointAnnotation1);


               }

             }

        }

    plotModel.Series.Add(series2);

下面是图表现在的样子

在2个轴上绘制3组数据

2 个答案: