This example demonstrates the TooltipModifier, a ChartModifierBase derived type which allows showing tooltips on touch on a Xamarin chart.

Alternative modifiers for displaying tooltips on a SciChart Xamarin Chart include the RolloverModifier and the CursorModifier.

See Documentation on how to add tooltips here:

• Tutorial: Adding tooltips to Xamarin iOS
• Tutorial: Adding tooltips to Xamarin Android

// UsingTooltipModifierTooltipsViewController.cs (Xamarin.iOS)

using CoreGraphics;
using Xamarin.Examples.Demo.Data;
using SciChart.iOS.Charting;
using Xamarin.Examples.Demo.Utils;
using System.Linq;

namespace Xamarin.Examples.Demo.iOS
{
    [ExampleDefinition("Using TooltipModifier Tooltips", description: "Demonstrates a simple tooltip", icon: ExampleIcon.Annotations)]
    public class UsingTooltipModifierTooltipsViewController : SingleChartViewController<SCIChartSurface>
    {
        protected override void InitExample()
        {
            var xAxis = new SCINumericAxis { GrowBy = new SCIDoubleRange(0.1, 0.1) };
            var yAxis = new SCINumericAxis { GrowBy = new SCIDoubleRange(0.1, 0.1) };

            var ds1 = new XyDataSeries<double, double> { SeriesName = "Lissajous Curve", AcceptsUnsortedData = true };
            var ds2 = new XyDataSeries<double, double> { SeriesName = "Sinewave" };

            var ds1Points = DataManager.Instance.GetLissajousCurve(0.8, 0.2, 0.43, 500);
            var ds2Points = DataManager.Instance.GetSinewave(1.5, 1.0, 500);

            ds1.Append(ds1Points.XData.Select(value => (value + 1) * 5), ds1Points.YData);
            ds2.Append(ds2Points.XData, ds2Points.YData);

            var line1 = new SCIFastLineRenderableSeries
            {
                DataSeries = ds1,
                StrokeStyle = new SCISolidPenStyle(ColorUtil.SteelBlue, 2f),
                PointMarker = new SCIEllipsePointMarker { Size = new CGSize(5, 5), FillStyle = new SCISolidBrushStyle(ColorUtil.SteelBlue) }
            };
            var line2 = new SCIFastLineRenderableSeries
            {
                DataSeries = ds2,
                StrokeStyle = new SCISolidPenStyle(0xFFFF3333, 2f),
                PointMarker = new SCIEllipsePointMarker { Size = new CGSize(5, 5), FillStyle = new SCISolidBrushStyle(0xFFFF3333) }
            };

            using (Surface.SuspendUpdates())
            {
                Surface.XAxes.Add(xAxis);
                Surface.YAxes.Add(yAxis);
                Surface.RenderableSeries.Add(line1);
                Surface.RenderableSeries.Add(line2);
                Surface.ChartModifiers.Add(new SCITooltipModifier());

                SCIAnimations.FadeSeries(line1, 3, new SCICubicEase());
                SCIAnimations.FadeSeries(line2, 3, new SCICubicEase());
            }
        }
    }
}

// UsingTooltipModifierTooltipsFragment.cs (Xamarin.Android)

using System.Collections.Generic;
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.PointMarkers;
using SciChart.Charting.Visuals.RenderableSeries;
using SciChart.Data.Model;
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;
using Xamarin.Examples.Demo;
using Xamarin.Examples.Demo.Utils;

namespace Xamarin.Examples.Demo.Droid.Fragments.Examples
{
    [ExampleDefinition("Using TooltipModifier Tooltips", description: "Demonstrates a simple tooltip", icon: ExampleIcon.Annotations)]
    public class UsingTooltipModifierTooltipsFragment : ExampleBaseFragment
    {
        public override int ExampleLayoutId => Resource.Layout.Example_Single_Chart_Fragment;

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

        protected override void InitExample()
        {
            var xAxis = new NumericAxis(Activity) {GrowBy = new DoubleRange(0.1, 0.1)};
            var yAxis = new NumericAxis(Activity) {GrowBy = new DoubleRange(0.1, 0.1)};

            var ds1 = new XyDataSeries<double, double> {SeriesName = "Lissajous Curve", AcceptsUnsortedData = true};
            var ds2 = new XyDataSeries<double, double> {SeriesName = "Sinewave", AcceptsUnsortedData = true};

            var ds1Points = DataManager.Instance.GetLissajousCurve(0.8, 0.2, 0.43, 500);
            var ds2Points = DataManager.Instance.GetSinewave(1.5, 1.0, 500);

            var scaledXValues = GetScaledValues(ds1Points.XData);
            ds1.Append(scaledXValues, ds1Points.YData);
            ds2.Append(ds2Points.XData, ds2Points.YData);

            var rs1 = new FastLineRenderableSeries
            {
                DataSeries = ds1,
                StrokeStyle = new SolidPenStyle(ColorUtil.SteelBlue, 2f.ToDip(Activity)),
                PointMarker = new EllipsePointMarker
                {
                    Width = 5.ToDip(Activity),
                    Height = 5.ToDip(Activity),
                    StrokeStyle = new SolidPenStyle(ColorUtil.SteelBlue, 2f.ToDip(Activity)),
                    FillStyle = new SolidBrushStyle(ColorUtil.SteelBlue)
                }
            };
            var rs2 = new FastLineRenderableSeries
            {
                DataSeries = ds2,
                StrokeStyle = new SolidPenStyle(0xFFFF3333, 2f.ToDip(Activity)),
                PointMarker = new EllipsePointMarker
                {
                    Width = 5.ToDip(Activity),
                    Height = 5.ToDip(Activity),
                    StrokeStyle = new SolidPenStyle(0xFFFF3333, 2f.ToDip(Activity)),
                    FillStyle = new SolidBrushStyle(0xFFFF3333)
                }
            };

            using (Surface.SuspendUpdates())
            {
                Surface.XAxes.Add(xAxis);
                Surface.YAxes.Add(yAxis);
                Surface.RenderableSeries = new RenderableSeriesCollection { rs1, rs2 };
                Surface.ChartModifiers.Add(new TooltipModifier {UseInterpolation = true});

                new OpacityAnimatorBuilder(rs1) { Duration = 1000, StartDelay = 600 }.Start();
                new OpacityAnimatorBuilder(rs2) { Duration = 1000, StartDelay = 600 }.Start();
            }
        }

        private static IList<double> GetScaledValues(IList<double> values)
        {
            var size = values.Count;
            var scaledValues = new List<double>(size);

            for (var i = 0; i < size; i++)
            {
                var value = values[i];
                scaledValues.Add((value + 1)*5);
            }

            return scaledValues;
        }
    }
}

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