Logarithmic Scale

sample image

LogarithmicPoint.cs

namespace ViewModelsSamples.Axes.Logarithmic;

public class LogarithmicPoint(double x, double y)
{
    public double X { get; set; } = x;
    public double Y { get; set; } = y;
}

Code behind

using System;
using Eto.Forms;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Eto;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;
using ViewModelsSamples.Axes.Logarithmic;

namespace EtoFormsSample.Axes.Logarithmic;

public class View : Panel
{
    private readonly CartesianChart cartesianChart;

    public View()
    {
        var logBase = 10d;

        // register the logarithmic point mapper
        LiveCharts.Configure(config =>
            config.HasMap<LogarithmicPoint>(
                (logPoint, index) => new(logPoint.X, Math.Log(logPoint.Y, logBase))));

        var values = new LogarithmicPoint[]
        {
            new(1, 1),
            new(2, 10),
            new(3, 100),
            new(4, 1000),
            new(5, 10000),
            new(6, 100000),
            new(7, 1000000),
            new(8, 10000000)
        };

        var series = new ISeries[]
        {
            new LineSeries<LogarithmicPoint> { Values = values }
        };

        var yAxis = new LogarithmicAxis(logBase)
        {
            SeparatorsPaint = new SolidColorPaint(SKColors.LightSlateGray),
            SubseparatorsPaint = new SolidColorPaint(SKColors.LightSlateGray) { StrokeThickness = 0.5f },
            SubseparatorsCount = 9
        };

        cartesianChart = new CartesianChart
        {
            Series = series,
            YAxes = [yAxis],
        };

        Content = cartesianChart;
    }
}

Articles you might also find useful:

Cartesian chart control
Axes properties
Column series properties