Question

我必须在Xamarin.Forms中实现多个数据条目的线性和条形图，我已经看到了多个插件，例如Microcharts，但我认为它不提供多个条目，而Syncfusion却可以提供但不是免费的。有免费的插件吗？

图表示例：

Bar Chart

Linear

Answer 1

根据您的需求，可以使用PlotView来实现。在使用它之前，请参考以下链接初始化OxyPlot，

http://docs.oxyplot.org/en/latest/getting-started/hello-xamarin-forms.html

我写了一个演示，您可以参考它。

条形图屏幕截图

条形图代码

[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class BarGraphsDemo : ContentPage
{
    private PlotView _opv = new PlotView();
    public BarGraphsDemo ()
{
InitializeComponent ();

        var plotModel = new PlotModel { Title = "OxyPlot Demo" };
        CategoryAxis xaxis = new CategoryAxis();
        xaxis.Position = AxisPosition.Bottom;
        xaxis.MajorGridlineStyle = LineStyle.Solid;
        xaxis.MinorGridlineStyle = LineStyle.Dot;
        xaxis.Labels.Add("2/2010");
        xaxis.Labels.Add("2/2011");
        xaxis.Labels.Add("2/2012");
        xaxis.Labels.Add("2/2013");

        ColumnSeries s1 = new ColumnSeries();
        s1.IsStacked = false;
        s1.Items.Add(new ColumnItem(1.2));
        s1.Items.Add(new ColumnItem(1.6));
        s1.Items.Add(new ColumnItem(1.4));
        s1.Items.Add(new ColumnItem(1.5));

        ColumnSeries s2 = new ColumnSeries();
        s2.IsStacked = false;
        s2.Items.Add(new ColumnItem(1.5));
        s2.Items.Add(new ColumnItem(1.6));
        s2.Items.Add(new ColumnItem(1.1));
        s2.Items.Add(new ColumnItem(1.2));

        ColumnSeries s3 = new ColumnSeries();
        s3.IsStacked = false;
        s3.Items.Add(new ColumnItem(1.2));
        s3.Items.Add(new ColumnItem(1.3));
        s3.Items.Add(new ColumnItem(1.4));
        s3.Items.Add(new ColumnItem(1.5));

        ColumnSeries s4 = new ColumnSeries();
        s4.IsStacked = false;
        s4.Items.Add(new ColumnItem(1.5));
        s4.Items.Add(new ColumnItem(1.4));
        s4.Items.Add(new ColumnItem(1.3));
        s4.Items.Add(new ColumnItem(1.2));



        plotModel.Series.Add(s1);
        plotModel.Series.Add(s2);
        plotModel.Series.Add(s3);
        plotModel.Series.Add(s4);

        plotModel.Axes.Add(xaxis);
        plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Left, Minimum = 0, Maximum = 1.6 });

        _opv.Model = plotModel;
        Content = _opv;
    }

} 线性截图

线性代码

   public partial class MainPage : ContentPage
{
    private PlotView _opv = new PlotView();

    public MainPage()
    {
        InitializeComponent();

        var Points = new List<DataPoint>
        {
            //DateTimeAxis.ToDouble(new DateTime(1989, 10, 3)), 8)
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 15)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 30)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 1)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 15)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 1)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 15)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 1)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 15)), 0.75),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 31)), 0.75)
        };
        var Points2 = new List<DataPoint>
        {
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 15)), 0.9),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 30)), 0.9),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 1)), 0.9),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 15)), 0.9),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 1)), 1.0),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 15)), 1.15),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 1)), 1.0),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 15)), 0.9),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 31)), 0.9)
        };
        var Points3 = new List<DataPoint>
        {
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 15)), 1.42),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 30)), 1.42),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 1)), 1.42),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 15)), 1.42),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 1)), 1.5),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 15)), 1.6),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 1)), 1.41),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 15)), 1.42),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 31)), 1.42)
        };
        var Points4 = new List<DataPoint>
        {
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 15)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 10, 30)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 1)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 11, 15)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 1)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2018, 12, 15)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 1)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 15)), 1.57),
            new DataPoint(DateTimeAxis.ToDouble(new DateTime(2019, 1, 31)), 1.57)
        };


        var m = new PlotModel();
        m.PlotType = PlotType.XY;
        m.InvalidatePlot(false);

        m.Title = "hello oxy";


        var startDate = DateTime.Now.AddMonths(-3);
        var endDate = DateTime.Now;

        var minValue = DateTimeAxis.ToDouble(startDate);
        var maxValue = DateTimeAxis.ToDouble(endDate);
        m.Axes.Add(new DateTimeAxis { Position = AxisPosition.Bottom, Minimum = minValue, Maximum = maxValue, StringFormat = "MMM/yyyy" });
        m.Axes.Add(new LinearAxis { Position = AxisPosition.Left, Minimum = 0, Maximum = 1.6 });
        m.ResetAllAxes();

        var ls1 = new LineSeries();
        var ls2 = new LineSeries();
        var ls3 = new LineSeries();
        var ls4 = new LineSeries();
        //MarkerType = OxyPlot.MarkerType.Circle,
        ls1.MarkerType = OxyPlot.MarkerType.Circle;
        ls2.MarkerType = OxyPlot.MarkerType.Circle;
        ls3.MarkerType = OxyPlot.MarkerType.Circle;
        ls4.MarkerType = OxyPlot.MarkerType.Circle;
        ls1.ItemsSource = Points;
        ls2.ItemsSource = Points2;
        ls3.ItemsSource = Points3;
        ls4.ItemsSource = Points4;

        m.Series.Add(ls1);
        m.Series.Add(ls2);
        m.Series.Add(ls3);
        m.Series.Add(ls4);
        _opv = new PlotView
        {
            WidthRequest = 300,
            HeightRequest = 300,
            BackgroundColor = Color.White,

        };
        _opv.Model = m;
        Content = _opv;
    }

如果您想了解有关PlotView的更多详细信息，可以参考此链接。 http://docs.oxyplot.org/en/latest/introduction/index.html

Xamarin表单中具有多个条目的条形图/线性图

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