# Logarithmic Scale

This web site builds the control from code behind but you could also grab it from the toolbox, this sample also uses a ViewModel to populate the properties of the control(s) in this sample. ## View model

``````using System;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;

namespace ViewModelsSamples.Axes.Logarithmic;

public partial class ViewModel : ObservableObject
{
// base 10 log, change the base if you require it.
// or use any custom scale the logic is the same.
private static readonly int s_logBase = 10;

public ISeries[] Series { get; set; } =
{
new LineSeries<LogarithmicPoint>
{
Mapping = (logPoint, chartPoint) =>
{
// for the x coordinate, we use the X property of the LogaritmicPoint instance
chartPoint.SecondaryValue = logPoint.X;

// but for the Y coordinate, we will map to the logarithm of the value
chartPoint.PrimaryValue = Math.Log(logPoint.Y, s_logBase); // mark
},
Values = new LogarithmicPoint[]
{
new() { X = 1, Y = 10 },
new() { X = 2, Y = 100 },
new() { X = 3, Y = 1000 },
new() { X = 4, Y = 10000 },
new() { X = 5, Y = 100000 },
new() { X = 6, Y = 1000000 },
new() { X = 7, Y = 10000000 }
}
}
};

public Axis[] YAxes { get; set; } =
{
new Axis
{
// forces the step of the axis to be at least 1
MinStep = 1,

// converts the log scale back for the label
Labeler = value => Math.Pow(s_logBase, value).ToString() // mark
}
};
}

``````

## LogarithmicPoint.cs

``````namespace ViewModelsSamples.Axes.Logarithmic;

public class LogarithmicPoint
{
public double X { get; set; }
public double Y { get; set; }
}
``````

## Form code behind

``````using System.Windows.Forms;
using LiveChartsCore.SkiaSharpView.WinForms;
using ViewModelsSamples.Axes.Logarithmic;

namespace WinFormsSample.Axes.Logarithmic;

public partial class View : UserControl
{

public View()
{
InitializeComponent();
Size = new System.Drawing.Size(50, 50);

var viewModel = new ViewModel();

cartesianChart = new CartesianChart
{
Series = viewModel.Series,
YAxes = viewModel.YAxes,

// out of livecharts properties...
Location = new System.Drawing.Point(0, 0),
Size = new System.Drawing.Size(50, 50),
Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom
};