Question

使用Oxyplot，如何从给定的ColumnSeries中删除项目？

鉴于代码是库本身提供的示例（稍加修改），以及某种类型的Delete事件（我可以自己弄清楚）如何从中删除项目（列）图表？

如果我只是从bar.Items列表中删除该项目，那么Label就不会失败。从tmp.Axes [0]中删除它.ActualLabels（这是CategoryAxis）赢了＆＃34;刷新＆＃34;视图，标签仍然存在。这种情况有什么解决方案吗？我已经设法用Line和Pie Graphs来做，但是我在第一列中苦苦挣扎。

构建图表的代码隐藏：

namespace ColumnSeriesDemo
{
    using System.Collections.ObjectModel;
    using System.Windows;

    using OxyPlot;
    using OxyPlot.Axes;
    using OxyPlot.Series;

    using WpfExamples;

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    [Example("Shows column series.")]
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();

            // Create some data
            this.Items = new Collection<Item>
                            {
                                new Item {Label = "Apples", Value1 = 37, Value2 = 12, Value3 = 19},
                                new Item {Label = "Pears", Value1 = 7, Value2 = 21, Value3 = 9},
                                new Item {Label = "Bananas", Value1 = 23, Value2 = 2, Value3 = 29}
                            };

            // Create the plot model
            var tmp = new PlotModel { Title = "Column series", LegendPlacement = LegendPlacement.Outside, LegendPosition = LegendPosition.RightTop, LegendOrientation = LegendOrientation.Vertical };

            // Add the axes, note that MinimumPadding and AbsoluteMinimum should be set on the value axis.
            tmp.Axes.Add(new CategoryAxis { ItemsSource = this.Items, LabelField = "Label" });
            tmp.Axes.Add(new LinearAxis { Position = AxisPosition.Left, MinimumPadding = 0, AbsoluteMinimum = 0 });

            // Add the series, note that the BarSeries are using the same ItemsSource as the CategoryAxis.
            ColumnSeries bar = new ColumnSeries();
            tmp.Series.Add(bar);
            bar.Items.Add(new ColumnItem { Color = OxyPlot.OxyColors.Yellow, Value = this.Items[0].Value3, CategoryIndex = 0 });
            bar.Items.Add(new ColumnItem { Color = OxyPlot.OxyColors.Green, Value = this.Items[0].Value2, CategoryIndex = 2 });
            bar.Items.Add(new ColumnItem { Color = OxyPlot.OxyColors.Red, Value = this.Items[0].Value1, CategoryIndex = 3 });


            this.Model1 = tmp;

            this.DataContext = this;
        }

        public Collection<Item> Items { get; set; }

        public PlotModel Model1 { get; set; }
    }

    public class Item
    {
        public string Label { get; set; }
        public double Value1 { get; set; }
        public double Value2 { get; set; }
        public double Value3 { get; set; }
    }
}

Answer 1

我不确定我知道你想要做什么，但我希望这会对你有所帮助：

我拿了样本，然后围绕你的代码和样本玩了一下。我认为您的代码存在的问题是您的CategoryAxis中有绑定，但数据不会添加Bind，而是直接添加到您的ColumnSeries中。使用你的代码，我按原样离开了第一部分，而不是ColumnSeries bar = new ColumnSeries()我做了：

        ColumnSeries bar = new ColumnSeries
        {
            FillColor = OxyPlot.OxyColors.Yellow,
            ValueField = "Value1",
            Title = "Value1",
            ItemsSource = Items
        };
        tmp.Series.Add(bar);

这样Items中的数据就会绑定在CategoryAxis和ColumnSeries中（当然，如果您需要更多列代表Value2和{{1}您可以将新的ColumnSeries添加到PlotModel系列中的Value3类的值

然后我在窗口添加了一个Button，并在Code-Behind中添加了：

Items

这会更新Plot删除（每次）第一个Items.RemoveAt(0); Model1.InvalidatePlot(true);，包括ColumnSeries中的标签。

Window Code-Behind：

CategoryAxis

＆lt;＆lt; --------------------------------- EDIT --------- ------------------------＆GT;＆GT;

如果每个类别只需要一个条形，则每个项目只需要一个值。然后你可以（如上例所示）从集合中删除甚至添加项目（使用using System.Collections.ObjectModel; using System.Windows; using OxyPlot; using OxyPlot.Axes; using OxyPlot.Series; namespace OxyPlot_TEST { /// <summary> /// Interaction logic for Window2.xaml /// </summary> public partial class Window2 : Window { public Window2() { InitializeComponent(); // Create some data this.Items = new Collection<Item> { new Item {Label = "Apples", Value1 = 37, Value2 = 12, Value3 = 19}, new Item {Label = "Pears", Value1 = 7, Value2 = 21, Value3 = 9}, new Item {Label = "Bananas", Value1 = 23, Value2 = 2, Value3 = 29} }; // Create the plot model var tmp = new PlotModel { Title = "Column series", LegendPlacement = LegendPlacement.Outside, LegendPosition = LegendPosition.RightTop, LegendOrientation = LegendOrientation.Vertical }; // Add the axes, note that MinimumPadding and AbsoluteMinimum should be set on the value axis. tmp.Axes.Add(new CategoryAxis { ItemsSource = this.Items, LabelField = "Label" }); tmp.Axes.Add(new LinearAxis { Position = AxisPosition.Left, MinimumPadding = 0, AbsoluteMinimum = 0 }); ColumnSeries bar = new ColumnSeries { FillColor = OxyPlot.OxyColors.Yellow, ValueField = "Value1", Title = "Value1", ItemsSource = Items }; ColumnSeries bar1 = new ColumnSeries { FillColor = OxyPlot.OxyColors.Green, ValueField = "Value1", Title = "Value1", ItemsSource = Items }; ColumnSeries bar2 = new ColumnSeries { FillColor = OxyPlot.OxyColors.Red, ValueField = "Value1", Title = "Value1", ItemsSource = Items }; tmp.Series.Add(bar); tmp.Series.Add(bar1); tmp.Series.Add(bar2); this.Model1 = tmp; this.DataContext = this; } public Collection<Item> Items { get; set; } public PlotModel Model1 { get; set; } private void button1_Click(object sender, RoutedEventArgs e) { Items.RemoveAt(0); Model1.InvalidatePlot(true); } } public class Item { public string Label { get; set; } public double Value1 { get; set; } public double Value2 { get; set; } public double Value3 { get; set; } } }更新图表。代码隐藏：

InvalidatePlot

从ColumnSeries中删除项目

1 个答案: