Question

我正在使用LiveCharts创建饼图。我有一个双打列表，我想在饼图中表示。问题是列表的值可以改变，因此我希望能够相应地更改图表。

以下是LiveCharts网站的一些示例代码：

using System;
using System.Windows.Forms;
using LiveCharts;
using LiveCharts.Wpf;

namespace Winforms.PieChart
{
public partial class PieChartExample : Form
{
    public PieChartExample()
    {
        InitializeComponent();

        Func<ChartPoint, string> labelPoint = chartPoint =>
            string.Format("{0} ({1:P})", chartPoint.Y, chartPoint.Participation);

        pieChart1.Series = new SeriesCollection
        {
            new PieSeries
            {
                Title = "Maria",
                Values = new ChartValues<double> {3},
                PushOut = 15,
                DataLabels = true,
                LabelPoint = labelPoint
            },
            new PieSeries
            {
                Title = "Charles",
                Values = new ChartValues<double> {4},
                DataLabels = true,
                LabelPoint = labelPoint
            },
            new PieSeries
            {
                Title = "Frida",
                Values = new ChartValues<double> {6},
                DataLabels = true,
                LabelPoint = labelPoint
            },
            new PieSeries
            {
                Title = "Frederic",
                Values = new ChartValues<double> {2},
                DataLabels = true,
                LabelPoint = labelPoint
            }
        };

        pieChart1.LegendLocation = LegendLocation.Bottom;
    }
}

}

基本上，我想做同样的事情，而是迭代列表并为饼图创建适当数量的切片。 LiveCharts提供PieSlices，但PieChart Control只接受SeriesCollection，这就是我将pieChartData分配给图表时代码崩溃的原因。这是我尝试填充PieChart：

        LiveCharts.Wpf.PieChart pieChartData = new LiveCharts.Wpf.PieChart();

        foreach (var n in areavalues)
        {
            pieChartData.AddToView(new PieSlice
            {
                PieceValue = n
            });
        }

        areaChart.Series.Add(new PieSeries(pieChartData)); //<-- CRASH

我很难找到LiveCharts的任何其他示例代码，有人知道怎么做吗？

Answer 1

所以我终于明白了：

        foreach (var n in classChartData.Slice)
        {
            areaChart.Series.Add(new PieSeries
            {
                Title = n.Key,
                Values = new ChartValues<double> { n.Value }
            });
        }

        areaChart.LegendLocation = LegendLocation.Bottom;

classChartData

    private Dictionary<string, double> slice = new Dictionary<string, double>();

    public Dictionary<string, double> Slice
    {
        get { return slice; }
        set { slice = value; }
    }

    public void AddSlice(string slicename, double slicevalue)
    {
        slice.Add(slicename, slicevalue);
    }

我希望这可以帮助任何人使用LiveCharts。

Answer 2

如果有人仍在寻找解决方案，这就是我解决问题的方法

Func<ChartPoint, string> labelPoint = chartPoint =>
        string.Format("{0} ({1:P})", chartPoint.Y, chartPoint.Participation);

        ChartValues<double> cht_y_values = new ChartValues<double>();

        LiveCharts.SeriesCollection series = new LiveCharts.SeriesCollection();

        foreach (DataRow dr in dt.Rows)
        {
            PieSeries ps = new PieSeries
            {
                Title = dr[x_column_name].ToString(),
                Values = new ChartValues<double> {
                                double.Parse(dr[y1_column_name].ToString())},
                DataLabels = true,
                LabelPoint = labelPoint

            };

            series.Add(ps);
        }
   pieChart.Series = series;

Answer 3

using System;
using System.Windows.Forms;
using LiveCharts;
using LiveCharts.Wpf;

namespace Winforms.PieChart
{
    public partial class PieChartExample : Form
    {
        public PieChartExample()
        {
            InitializeComponent();

            Func<ChartPoint, string> labelPoint = chartPoint =>
                string.Format("{0} ({1:P})", chartPoint.Y, chartPoint.Participation);

            pieChart1.Series = new SeriesCollection
            {
                new PieSeries
                {
                    Title = "Maria",
                    Values = new ChartValues<double> {3},
                    PushOut = 15,
                    DataLabels = true,
                    LabelPoint = labelPoint
                },
                new PieSeries
                {
                    Title = "Charles",
                    Values = new ChartValues<double> {4},
                    DataLabels = true,
                    LabelPoint = labelPoint
                },
                new PieSeries
                {
                    Title = "Frida",
                    Values = new ChartValues<double> {6},
                    DataLabels = true,
                    LabelPoint = labelPoint
                },
                new PieSeries
                {
                    Title = "Frederic",
                    Values = new ChartValues<double> {2},
                    DataLabels = true,
                    LabelPoint = labelPoint
                }
            };

            pieChart1.LegendLocation = LegendLocation.Bottom;
        }
    }
}

在LiveCharts中创建饼图切片

3 个答案: