This example demonstrates how to create a simple Xamarin Line Chart with a legend on it.

See tutorials on how to work with legends on Xamarin.iOS and legends on Xamarin.Android

Tip!

There are many different configurations for the Legend control. The Legend displays the series names, colors and a checkbox which can be used to change visibility of the series. It is possible to change the legend orientation, to show/hide series markers or visibility checkboxes, as well as set the position of the legend in the chart. This example demonstrates how to create a simple Xamarin Line Chart with a legend to it.

// LegendViewController.cs (Xamarin.iOS)

using Xamarin.Examples.Demo.Data;
using SciChart.iOS.Charting;

namespace Xamarin.Examples.Demo.iOS
{
    [ExampleDefinition("Chart Legends API", description: "Demonstrates the SciChart Legend API", icon: ExampleIcon.LineChart)]
    public class LegendViewController : SingleChartViewController<SCIChartSurface>
    {
        protected override void InitExample()
        {
            var xAxis = new SCINumericAxis();
            var yAxis = new SCINumericAxis();

            var ds1 = new XyDataSeries<double, double> { SeriesName = "Curve A" };
            var ds2 = new XyDataSeries<double, double> { SeriesName = "Curve B" };
            var ds3 = new XyDataSeries<double, double> { SeriesName = "Curve C" };
            var ds4 = new XyDataSeries<double, double> { SeriesName = "Curve D" };

            var ds1Points = DataManager.Instance.GetStraightLine(4000, 1.0, 10);
            var ds2Points = DataManager.Instance.GetStraightLine(3000, 1.0, 10);
            var ds3Points = DataManager.Instance.GetStraightLine(2000, 1.0, 10);
            var ds4Points = DataManager.Instance.GetStraightLine(1000, 1.0, 10);

            ds1.Append(ds1Points.XData, ds1Points.YData);
            ds2.Append(ds2Points.XData, ds2Points.YData);
            ds3.Append(ds3Points.XData, ds3Points.YData);
            ds4.Append(ds4Points.XData, ds4Points.YData);

            var rs1 = new SCIFastLineRenderableSeries { DataSeries = ds1, StrokeStyle = new SCISolidPenStyle(0xFFFFFF00, 2f) };
            var rs2 = new SCIFastLineRenderableSeries { DataSeries = ds2, StrokeStyle = new SCISolidPenStyle(0xFF279B27, 2f) };
            var rs3 = new SCIFastLineRenderableSeries { DataSeries = ds3, StrokeStyle = new SCISolidPenStyle(0xFFFF1919, 2f) };
            var rs4 = new SCIFastLineRenderableSeries { DataSeries = ds4, StrokeStyle = new SCISolidPenStyle(0xFF1964FF, 2f), IsVisible = false };

            using (Surface.SuspendUpdates())
            {
                Surface.XAxes.Add(xAxis);
                Surface.YAxes.Add(yAxis);
                Surface.RenderableSeries.Add(rs1);
                Surface.RenderableSeries.Add(rs2);
                Surface.RenderableSeries.Add(rs3);
                Surface.RenderableSeries.Add(rs4);
                Surface.ChartModifiers.Add(new SCILegendModifier { SourceMode = SCISourceMode.AllSeries });

                SCIAnimations.SweepSeries(rs1, 3, new SCICubicEase());
                SCIAnimations.SweepSeries(rs2, 3, new SCICubicEase());
                SCIAnimations.SweepSeries(rs3, 3, new SCICubicEase());
                SCIAnimations.SweepSeries(rs4, 3, new SCICubicEase());
            }
        }
    }
}

// LegendChartFragment.cs (Xamarin.Android)

using Android.Views.Animations;
using SciChart.Charting.Model;
using SciChart.Charting.Model.DataSeries;
using SciChart.Charting.Modifiers;
using SciChart.Charting.Visuals;
using SciChart.Charting.Visuals.Animations;
using SciChart.Charting.Visuals.Axes;
using SciChart.Charting.Visuals.RenderableSeries;
using SciChart.Drawing.Common;
using Xamarin.Examples.Demo.Data;
using Xamarin.Examples.Demo;
using Xamarin.Examples.Demo.Droid.Extensions;
using Xamarin.Examples.Demo.Droid.Fragments.Base;

namespace Xamarin.Examples.Demo.Droid.Fragments.Examples
{
    [ExampleDefinition("Chart Legends API", description:"Demonstrates the SciChart Legend API", icon: ExampleIcon.LineChart)]
    public class LegendFragment : ExampleBaseFragment
    {
        public override int ExampleLayoutId => Resource.Layout.Example_Single_Chart_Fragment;

        private SciChartSurface Surface => View.FindViewById<SciChartSurface>(Resource.Id.chart);

        protected override void InitExample()
        {
            var xAxis = new NumericAxis(Activity);
            var yAxis = new NumericAxis(Activity);

            var ds1 = new XyDataSeries<double, double> {SeriesName = "Curve A"};
            var ds2 = new XyDataSeries<double, double> {SeriesName = "Curve B"};
            var ds3 = new XyDataSeries<double, double> {SeriesName = "Curve C"};
            var ds4 = new XyDataSeries<double, double> {SeriesName = "Curve D"};

            var ds1Points = DataManager.Instance.GetStraightLine(4000, 1.0, 10);
            var ds2Points = DataManager.Instance.GetStraightLine(3000, 1.0, 10);
            var ds3Points = DataManager.Instance.GetStraightLine(2000, 1.0, 10);
            var ds4Points = DataManager.Instance.GetStraightLine(1000, 1.0, 10);

            ds1.Append(ds1Points.XData, ds1Points.YData);
            ds2.Append(ds2Points.XData, ds2Points.YData);
            ds3.Append(ds3Points.XData, ds3Points.YData);
            ds4.Append(ds4Points.XData, ds4Points.YData);

            var legendModifier = new LegendModifier(Activity);
            legendModifier.SetSourceMode(SourceMode.AllSeries);

            var line1 = new FastLineRenderableSeries { DataSeries = ds1, StrokeStyle = new SolidPenStyle(0xFFFFFF00, 2f.ToDip(Activity)) };
            var line2 = new FastLineRenderableSeries { DataSeries = ds2, StrokeStyle = new SolidPenStyle(0xFF279B27, 2f.ToDip(Activity)) };
            var line3 = new FastLineRenderableSeries { DataSeries = ds3, StrokeStyle = new SolidPenStyle(0xFFFF1919, 2f.ToDip(Activity)) };
            var line4 = new FastLineRenderableSeries { DataSeries = ds4, IsVisible = false, StrokeStyle = new SolidPenStyle(0xFF1964FF, 2f.ToDip(Activity)) };

            using (Surface.SuspendUpdates())
            {
                Surface.XAxes.Add(xAxis);
                Surface.YAxes.Add(yAxis);
                Surface.RenderableSeries = new RenderableSeriesCollection { line1, line2, line3, line4 };
                Surface.ChartModifiers.Add(legendModifier);

                new SweepAnimatorBuilder(line1) { Interpolator = new DecelerateInterpolator(), Duration = 3000, StartDelay = 350 }.Start();
                new SweepAnimatorBuilder(line2) { Interpolator = new DecelerateInterpolator(), Duration = 3000, StartDelay = 350 }.Start();
                new SweepAnimatorBuilder(line3) { Interpolator = new DecelerateInterpolator(), Duration = 3000, StartDelay = 350 }.Start();
                new SweepAnimatorBuilder(line4) { Interpolator = new DecelerateInterpolator(), Duration = 3000, StartDelay = 350 }.Start();
            }
        }
    }
}

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