如何使用实时图表在条形图的每一列上添加标签

时间:2019-07-03 09:52:29

标签: c# livecharts

使用LiveCharts(https://lvcharts.net/)和C#,我想要一个条形图,其中每一列在x轴上都有一个标签。但是,我仅在第二列上得到一个标签。标签以数据方式存在,当我将鼠标悬停在列上时,我会在弹出窗口中看到它们。

我尝试弄乱轴上的各种标签属性以及我的labelformatter,但我每隔两列都只会得到一个标签。

我的图表的XAML实现:

<lvc:CartesianChart Name="CartesianChart" Series="{Binding Series}" MinHeight="400" MinWidth="800" >

    <lvc:CartesianChart.AxisX>
        <lvc:Axis MinValue="0" Labels="{Binding XAxisLabels}" ShowLabels="True" LabelsRotation="50">
            <lvc:Axis.Separator>
                <lvc:Separator Stroke="{Binding AxisStrokeColor}">/lvc:Separator>
            </lvc:Axis.Separator>
        </lvc:Axis>
    </lvc:CartesianChart.AxisX>

    <lvc:CartesianChart.AxisY>
        <lvc:Axis MinValue="0"   MaxValue="10" LabelFormatter="{Binding LabelFormatter}">
            <lvc:Axis.Separator>
                <lvc:Separator Stroke="{Binding AxisStrokeColor}">/lvc:Separator>
            </lvc:Axis.Separator>
        </lvc:Axis>
    </lvc:CartesianChart.AxisY>
</lvc:CartesianChart>

用于实例化图表的代码:

public partial class Chart : UserControl
{
    public SolidColorBrush AxisStrokeColor { get; set; }
    public SeriesCollection Series { get; set; }
    public string[] XAxisLabels { get; set; }
    public Func<double, string> LabelFormatter { get; set; }

    public Chart()
    {
        Series = new SeriesCollection();
        InitializeComponent();
        AxisStrokeColor = Brushes.Transparent;
        CartesianChart.DataContext = this;
        CartesianChart.LegendLocation = LegendLocation.Right;
    }

    public void addBarSeries(List<KeyValuePair<string, double>> data, string title)
    {
        ChartValues<ObservableValue> values = new ChartValues<ObservableValue>();
        string[] labels = new string[data.Count];

        for (int i = 0; i < data.Count; i++)
        {
            values.Add(new ObservableValue(data[i].Value));
            labels[i] = data[i].Key;
        }

        Series.Add(new ColumnSeries
            {
                Title = title,
                Values = values,
                DataLabels = true,
            });

        XAxisLabels = labels;
        LabelFormatter = value => value.ToString("N");
    }
}

我用来用测试数据填充图表的功能

Chart.addBarSeries(seedData3(), "myTitle");

public List<KeyValuePair<string, double>> seedData3()
        {
            var returnCollection = new List<KeyValuePair<string, double>>();

            for (int i = 0; i < 10; i++)
            {

                returnCollection.Add(new KeyValuePair<string, double>("Timmy " + i, i));
            }

            return returnCollection;
        }

如何确保每一列都显示一个标签?

1 个答案:

答案 0 :(得分:1)

轴上显示的标签数量是自动计算的,以适合视图而不会重叠。

如果您想强制渲染标签的值,只需在Step上添加Separator属性:

<lvc:Separator Step="1" Stroke="{Binding AxisStrokeColor}"></lvc:Separator>