ChartPoint.StartAngle

ChartPoint.StartAngle property

Gets the starting angle for the pie section, measured in degrees clockwise from the x-axis after calls Chart.Calculate() method. Applies to Pie chart.

public float StartAngle { get; }

Examples

namespace AsposeCellsExamples
{
    using Aspose.Cells;
    using Aspose.Cells.Charts;
    using System;

    public class ChartPointPropertyStartAngleDemo
    {
        public static void Run()
        {
            // Create a new workbook
            Workbook workbook = new Workbook();
            Worksheet worksheet = workbook.Worksheets[0];

            // Add sample data for the chart
            worksheet.Cells["A1"].PutValue("Category");
            worksheet.Cells["A2"].PutValue("Apple");
            worksheet.Cells["A3"].PutValue("Orange");
            worksheet.Cells["A4"].PutValue("Banana");
            worksheet.Cells["B1"].PutValue("Value");
            worksheet.Cells["B2"].PutValue(50);
            worksheet.Cells["B3"].PutValue(30);
            worksheet.Cells["B4"].PutValue(20);

            // Add a pie chart
            int chartIndex = worksheet.Charts.Add(ChartType.Pie, 5, 0, 20, 10);
            Chart chart = worksheet.Charts[chartIndex];
            
            // Set chart data range
            chart.NSeries.Add("B2:B4", true);
            chart.NSeries.CategoryData = "A2:A4";

            // Calculate chart to ensure properties are populated
            chart.Calculate();

            // Get the first chart point
            ChartPoint point = chart.NSeries[0].Points[0];

            // Display the StartAngle value
            Console.WriteLine("StartAngle of first pie slice: " + point.StartAngle);

            // Note: StartAngle is read-only, so we can't set it directly
            // To change the start angle, we need to rotate the entire pie chart
            chart.NSeries[0].FirstSliceAngle = 90; // Rotate pie chart by 90 degrees

            // Recalculate to update angles
            chart.Calculate();

            // Display the new StartAngle value after rotation
            Console.WriteLine("StartAngle after rotation: " + point.StartAngle);

            // Save the workbook
            workbook.Save("ChartPointPropertyStartAngleDemo.xlsx");
        }
    }
}

See Also