Working with Tick-mark Labels on the Category Axis in C#, VB.NET

In charts, each category on the category axis is identified by a tick-mark label and separated from other categories by tick marks. The tick-mark label text comes from the name of the associated category and is usually placed next to the axis.

In this article, we will introduce how we can custom the tick-mark labels by changing the labels' position, rotating labels and specifying interval between labels in C#, VB.ENT.

Figure 1 – Chart in Example File

To facilitate the introduction, we prepared a PowerPoint document that contains a column chart looks like the screenshot in Figure 1 and used below code to get the chart from the PowerPoint slide. Then we're able to custom the labels through the following ways.

Presentation ppt = new Presentation(@"C:\Users\Administrator\Desktop\ColumnChart.pptx",FileFormat.Pptx2013);
IChart chart = ppt.Slides[0].Shapes[0] as IChart;

Rotate tick labels

chart.PrimaryCategoryAxis.TextRotationAngle = 45;

Working with Tick-mark Labels on the Category Axis in C#, VB.NET

Specify interval between labels

To change the number of unlabeled tick marks, we must set IsAutomaticTickLabelSpacing property as false and change the TickLabelSpacing property to any number between 1 - 255.

chart.PrimaryCategoryAxis.IsAutomaticTickLabelSpacing = false;
chart.PrimaryCategoryAxis.TickLabelSpacing = 2;

Working with Tick-mark Labels on the Category Axis in C#, VB.NET

Change tick labels' position

chart.PrimaryCategoryAxis.TickLabelPosition = TickLabelPositionType.TickLabelPositionHigh;

Working with Tick-mark Labels on the Category Axis in C#, VB.NET

Full Code:

[C#]

using Spire.Presentation;
using Spire.Presentation.Charts;

namespace TickMarkLabel
{
    class Program
    {
        static void Main(string[] args)
        {
            Presentation ppt = new Presentation(@"C:\Users\Administrator\Desktop\ColumnChart.pptx", FileFormat.Pptx2013);
            IChart chart = ppt.Slides[0].Shapes[0] as IChart;

            //rotate tick labels
            chart.PrimaryCategoryAxis.TextRotationAngle = 45;

            //specify interval between labels
            chart.PrimaryCategoryAxis.IsAutomaticTickLabelSpacing = false;
            chart.PrimaryCategoryAxis.TickLabelSpacing = 2;

            ////change position
            //chart.PrimaryCategoryAxis.TickLabelPosition = TickLabelPositionType.TickLabelPositionHigh;

            ppt.SaveToFile("result.pptx", FileFormat.Pptx2013);

        }
    }
}

[VB.NET]

Imports Spire.Presentation
Imports Spire.Presentation.Charts

Namespace TickMarkLabel
	Class Program
		Private Shared Sub Main(args As String())
			Dim ppt As New Presentation("C:\Users\Administrator\Desktop\ColumnChart.pptx", FileFormat.Pptx2013)
			Dim chart As IChart = TryCast(ppt.Slides(0).Shapes(0), IChart)

			'rotate tick labels
			chart.PrimaryCategoryAxis.TextRotationAngle = 45

			'specify interval between labels
			chart.PrimaryCategoryAxis.IsAutomaticTickLabelSpacing = False
			chart.PrimaryCategoryAxis.TickLabelSpacing = 2

			'''/change position
			'chart.PrimaryCategoryAxis.TickLabelPosition = TickLabelPositionType.TickLabelPositionHigh;

			ppt.SaveToFile("result.pptx", FileFormat.Pptx2013)

		End Sub
	End Class
End Namespace

Working with Tick-mark Labels on the Category Axis in C#, VB.NET

See Also