OxyPlot:如何使用轴标签格式化程序并显示 Y 标签? [英] OxyPlot: How to use the axis label formatter and show Y labels?
问题描述
我正在使用 Oxyplot 为我的 Xamarin.iOS 项目绘制条形图..
I'm using to Oxyplot for my Xamarin.iOS project for plotting a bar chart..
这是我的图表目前的样子
This is what my graph currently looks likes currently
这里不是 x 轴数值,而是数字,我想显示 sun、mon true、wed .....
here's instead of x axis values which are numbers, I want to show sun, 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?
I can see that CategoryAxis has a method called LabelFormatter which returns Func<double, string>
, but how do I use it?
还有为什么 Y 轴标签不显示?
And also why are the Y-Axis labels not showing?
public class MyClass
{
/// <summary>
/// Gets or sets the plot model that is shown in the demo apps.
/// </summary>
/// <value>My model.</value>
public PlotModel MyModel { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="OxyPlotSample.MyClass"/> class.
/// </summary>
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;
}
}
推荐答案
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.
To show the label on the axis you have to specify the property MajorStep
, Oxyplot will paint only the labels matching the major step.
model.Axes.Add(new LinearAxis()
{
MajorStep = 10,
Position = AxisPosition.Left,
...
});
并且要修改带有日期名称的标签,您可以使用 DateTimeAxis
而不是 LinearAxis
:
And to modify the labels with the day name, you can use a DateTimeAxis
instead of 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.
If you want something more customized you will have to use the LabelFormatter
attribute.
类别轴中的标签:
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
是只读的,所以你必须一一添加.
CategoryAxis.ActualLabels
is readOnly, so you will have to Add the items one by one.
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