How to set logarithmic scale for Excel chart in C#, VB.NET?

2 mins read

This article explains how to set logarithmic scale to chart axis using XlsIO.

Set logarithmic scale to chart axis

Excel defaults to a linear scale for charts, but you can easily change it to logarithmic to suit wide data ranges or logarithmic phenomena. This can be achieved in XlsIO using IsLogScale property. The below images show differences between with and without logarithmic scale in value axis.

$C:\Users\kondurukeerthi.kondu\AppData\Local\Microsoft\Windows\INetCache\Content.Word\Capture.png$

Chart value axis with logarithmic scale

$C:\Users\kondurukeerthi.kondu\AppData\Local\Microsoft\Windows\INetCache\Content.Word\Without_LogScale.png$

Chart value axis without logarithmic scale

Code snippet to set logarithmic scale to chart axis

//Set logarithmic scale to primary value axis
chart.PrimaryValueAxis.IsLogScale = true;

Download Complete Sample

Download input file with data

To know more about creating charts with various settings using XlsIO, please refer the documentation.

The following C#/ VB.NET complete code snippet shows how to set logarithmic scale to chart axis using XlsIO.

using Syncfusion.XlsIO;
using System.Reflection;
using System.IO;
 
namespace ChartSample
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ExcelEngine excelEngine = new ExcelEngine())
            {
                IApplication application = excelEngine.Excel;
                application.DefaultVersion = ExcelVersion.Excel2016;
 
                //Open existing workbook with data entered
                Assembly assembly = typeof(Program).GetTypeInfo().Assembly;
                Stream fileStream = assembly.GetManifestResourceStream("ChartSample.InputTemplate.xlsx");
                IWorkbook workbook = application.Workbooks.Open(fileStream);
                IWorksheet worksheet = workbook.Worksheets[0];
 
                //Initialize chart
                IChartShape chart = worksheet.Charts.Add();
                chart.ChartType = ExcelChartType.Column_Clustered;
 
                //Assign data
                chart.DataRange = worksheet["A1:D6"];
                chart.IsSeriesInRows = false;
 
                //Apply chart elements
                //Set chart title
                chart.ChartTitle = "Clustered Column Chart";
                
                //Set data labels
                IChartSerie serie1 = chart.Series[0];
                IChartSerie serie2 = chart.Series[1];
                IChartSerie serie3 = chart.Series[2];
 
                serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie3.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
 
                //Set logarithmic scale to primary value axis
                chart.PrimaryValueAxis.IsLogScale = true;
                
                //Positioning the chart in the worksheet
                chart.TopRow = 8;
                chart.LeftColumn = 1;
                chart.BottomRow = 23;
                chart.RightColumn = 8;
 
                //Saving the workbook
                Stream stream = File.Create("Output.xlsx");
                workbook.SaveAs(stream);
            }
        }
    }
}

Imports Syncfusion.XlsIO
Imports System.Reflection
Imports System.IO
 
Namespace ChartSample
 
    Class Program
 
        Public Shared Sub Main(ByVal args() As String)
            Using excelEngine As ExcelEngine = New ExcelEngine
                Dim application As IApplication = excelEngine.Excel
                application.DefaultVersion = ExcelVersion.Excel2016
 
                'Open existing workbook with data entered
                Dim assembly As Assembly = GetType(Program).GetTypeInfo.Assembly
                Dim fileStream As Stream = assembly.GetManifestResourceStream("ChartSample.InputTemplate.xlsx")
                Dim workbook As IWorkbook = application.Workbooks.Open(fileStream)
                Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
                'Initialize chart
                Dim chart As IChartShape = worksheet.Charts.Add
                chart.ChartType = ExcelChartType.Column_Clustered
 
                'Assign data
                chart.DataRange = worksheet("A1:D6")
                chart.IsSeriesInRows = False
 
                'Apply chart elements
                'Set chart title
                chart.ChartTitle = "Clustered Column Chart"
 
                'Set data labels
                Dim serie1 As IChartSerie = chart.Series(0)
                Dim serie2 As IChartSerie = chart.Series(1)
                Dim serie3 As IChartSerie = chart.Series(2)
 
                serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
                serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
                serie3.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
 
                'Set logarithmic scale to primary value axis
                chart.PrimaryValueAxis.IsLogScale = True
 
                'Positioning the chart in the worksheet
                chart.TopRow = 8
                chart.LeftColumn = 1
                chart.BottomRow = 23
                chart.RightColumn = 8
 
                'Saving the workbook
                Dim stream As Stream = File.Create("Output.xlsx")
                workbook.SaveAs(stream)
            End Using
        End Sub
    End Class
End Namespace

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How to set logarithmic scale for Excel chart in C#, VB.NET?

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