Sections

Code behind

using Eto.Forms;
using LiveChartsCore;
using LiveChartsCore.Defaults;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Eto;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace EtoFormsSample.General.Sections2;

public class View : Panel
{
    public View()
    {
        var values = new ObservablePoint[]
        {
            new(2.2, 5.4), new(4.5, 2.5), new(4.2, 7.4),
            new(6.4, 9.9), new(4.2, 9.2), new(5.8, 3.5),
            new(7.3, 5.8), new(8.9, 3.9), new(6.1, 4.6),
            new(9.4, 7.7), new(8.4, 8.5), new(3.6, 9.6),
            new(4.4, 6.3), new(5.8, 4.8), new(6.9, 3.4),
            new(7.6, 1.8), new(8.3, 8.3), new(9.9, 5.2),
            new(8.1, 4.7), new(7.4, 3.9), new(6.8, 2.3)
        };

        var series = new ISeries[]
        {
            new ScatterSeries<ObservablePoint>
            {
                Values = values,
                GeometrySize = 10,
                Stroke = new SolidColorPaint(SKColor.Parse("#00f")),
                Fill = null
            }
        };

        var sections = new RectangularSection[]
        {
            new() {
                Yi = 8,
                Yj = 8,
                Stroke = new SolidColorPaint
                {
                    Color = SKColor.Parse("#F00"),
                    StrokeThickness = 3,
                    PathEffect = new LiveChartsCore.SkiaSharpView.Painting.Effects.DashEffect(new float[] {6, 6})
                }
            },
            new() {
                Xi = 6,
                Xj = 8,
                Fill = new SolidColorPaint(SKColor.Parse("#300000FF"))
            }
        };

        var cartesianChart = new CartesianChart
        {
            Series = series,
            Sections = sections,
        };

        Content = cartesianChart;
    }
}

Articles you might also find useful: