OxyPlot：如何使用轴标签格式化器并显示Y标签？

我正在使用Oxyplot为我的Xamarin.iOS项目绘制条形图..

这是我的图表目前看起来喜欢的

这里是x轴值而不是数字，我想显示太阳，mon true，wed …..

我可以看到CategoryAxis有一个名为LabelFormatter的方法，它返回Func ，但我该如何使用它？

还有为什么Y轴标签没有显示???

 public class MyClass { /// 
 /// Gets or sets the plot model that is shown in the demo apps. /// 
 /// My model. public PlotModel MyModel { get; set; } /// 
 /// Initializes a new instance of the  class. /// 
 public MyClass() { var model = new PlotModel { Title = "ColumnSeries" }; model.PlotAreaBorderColor = OxyColors.Transparent; // A ColumnSeries requires a CategoryAxis on the x-axis. model.Axes.Add(new CategoryAxis() { Position = AxisPosition.Bottom, MinorTickSize = 0, MajorTickSize = 0, //MajorGridlineStyle = LineStyle.Solid, //MinorGridlineStyle = LineStyle.Solid, }); model.Axes.Add(new LinearAxis() { AxislineStyle = LineStyle.None, Position = AxisPosition.Left, MinorTickSize = 0, MajorTickSize = 0, MajorGridlineStyle = LineStyle.Solid, MinorGridlineStyle = LineStyle.Solid, Minimum = 0, Maximum = 400, }); var series = new ColumnSeries(); series.Items.Add(new ColumnItem() { Value = 200, Color = OxyColors.Orange}); series.Items.Add(new ColumnItem(200)); series.Items.Add(new ColumnItem(300)); series.Items.Add(new ColumnItem(100)); series.Items.Add(new ColumnItem(200)); series.Items.Add(new ColumnItem(100)); series.Items.Add(new ColumnItem(130)); model.Series.Add(series); this.MyModel = model; } } 

Answer 1

要在轴上显示标签，您必须指定属性MajorStep ，Oxyplot将仅绘制与主要步骤匹配的标签。

 model.Axes.Add(new LinearAxis() { MajorStep = 10, Position = AxisPosition.Left, ... }); 

要使用日期名称修改标签，可以使用DateTimeAxis而不是LinearAxis ：

 model.Axes.Add(new DateTimeAxis() { StringFormat = "ddd", Position = AxisPosition.Bottom, ... }); 

如果您想要更自定义的内容，则必须使用LabelFormatter属性。

编辑：

CategoryAxis中的标签：

 var categoryAxis = new CategoryAxis() { Position = AxisPosition.Bottom, ... }; categoryAxis.ActualLabels.Add("Mon"); categoryAxis.ActualLabels.Add("Tue"); categoryAxis.ActualLabels.Add("Wed"); categoryAxis.ActualLabels.Add("Thu"); categoryAxis.ActualLabels.Add("Fri"); categoryAxis.ActualLabels.Add("Sat"); categoryAxis.ActualLabels.Add("Sun"); Model.Axes.Add(categoryAxis); 

CategoryAxis.ActualLabels是readOnly，因此您必须逐个添加项目。