A doughnut chart (also spelled donut) is a variant of the pie chart, with a blank center allowing for additional information about the data as a whole to be included. In this article, you will learn how to create a doughnut chart in PowerPoint using Spire.Presentation.
Step 1: Initialize an instance of Presentation class.
Presentation presentation = new Presentation();
Step 2: Insert a Doughnut chart in the first slide and set the chart title.
RectangleF rect = new RectangleF(40, 100, 550, 320); IChart chart = presentation.Slides[0].Shapes.AppendChart(ChartType.Doughnut, rect, false); chart.ChartTitle.TextProperties.Text = "Market share by country"; chart.ChartTitle.TextProperties.IsCentered = true; chart.ChartTitle.Height = 30;
Step 3: Define the chart data.
string[] countries = new string[] { "Guba", "Mexico","France","German" };
int[] sales = new int[] { 1800, 3000, 5100, 6200 };
chart.ChartData[0, 0].Text = "Countries";
chart.ChartData[0, 1].Text = "Sales";
for (int i = 0; i < countries.Length; ++i)
{
chart.ChartData[i + 1, 0].Value = countries[i];
chart.ChartData[i + 1, 1].Value = sales[i];
}
Step 4: Set the data range of category labels, series label and series values.
chart.Series.SeriesLabel = chart.ChartData["B1", "B1"]; chart.Categories.CategoryLabels = chart.ChartData["A2", "A5"]; chart.Series[0].Values = chart.ChartData["B2", "B5"];
Step 5: Add data points to series and fill each data point with different color.
for (int i = 0; i < chart.Series[0].Values.Count; i++)
{
ChartDataPoint cdp = new ChartDataPoint(chart.Series[0]);
cdp.Index = i;
chart.Series[0].DataPoints.Add(cdp);
}
chart.Series[0].DataPoints[0].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[0].Fill.SolidColor.Color = Color.LightBlue;
chart.Series[0].DataPoints[1].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[1].Fill.SolidColor.Color = Color.MediumPurple;
chart.Series[0].DataPoints[2].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[2].Fill.SolidColor.Color = Color.DarkGray;
chart.Series[0].DataPoints[3].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[3].Fill.SolidColor.Color = Color.DarkOrange;
Step 6: Display value and percentage in data labels.
chart.Series[0].DataLabels.LabelValueVisible = true; chart.Series[0].DataLabels.PercentValueVisible = true;
Step 7: Adjust the hole size of doughnut chart.
chart.Series[0].DoughnutHoleSize = 60;
Step 8: Save the file.
presentation.SaveToFile("DoughnutChart.pptx", FileFormat.Pptx2013);
Output:
Full Code:
using Spire.Presentation;
using Spire.Presentation.Charts;
using Spire.Presentation.Drawing;
using System.Drawing;
namespace SetFont
{
class Program
{
static void Main(string[] args)
{
Presentation presentation = new Presentation();
RectangleF rect = new RectangleF(40, 100, 550, 320);
IChart chart = presentation.Slides[0].Shapes.AppendChart(ChartType.Doughnut, rect, false);
chart.ChartTitle.TextProperties.Text = "Market share by country";
chart.ChartTitle.TextProperties.IsCentered = true;
chart.ChartTitle.Height = 30;
string[] countries = new string[] { "Guba", "Mexico", "France", "German" };
int[] sales = new int[] { 1800, 3000, 5100, 6200 };
chart.ChartData[0, 0].Text = "Countries";
chart.ChartData[0, 1].Text = "Sales";
for (int i = 0; i < countries.Length; ++i)
{
chart.ChartData[i + 1, 0].Value = countries[i];
chart.ChartData[i + 1, 1].Value = sales[i];
}
chart.Series.SeriesLabel = chart.ChartData["B1", "B1"];
chart.Categories.CategoryLabels = chart.ChartData["A2", "A5"];
chart.Series[0].Values = chart.ChartData["B2", "B5"];
for (int i = 0; i < chart.Series[0].Values.Count; i++)
{
ChartDataPoint cdp = new ChartDataPoint(chart.Series[0]);
cdp.Index = i;
chart.Series[0].DataPoints.Add(cdp);
}
chart.Series[0].DataPoints[0].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[0].Fill.SolidColor.Color = Color.LightBlue;
chart.Series[0].DataPoints[1].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[1].Fill.SolidColor.Color = Color.MediumPurple;
chart.Series[0].DataPoints[2].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[2].Fill.SolidColor.Color = Color.DarkGray;
chart.Series[0].DataPoints[3].Fill.FillType = FillFormatType.Solid;
chart.Series[0].DataPoints[3].Fill.SolidColor.Color = Color.DarkOrange;
chart.Series[0].DataLabels.LabelValueVisible = true;
chart.Series[0].DataLabels.PercentValueVisible = true;
chart.Series[0].DoughnutHoleSize = 60;
presentation.SaveToFile("DoughnutChart.pptx", FileFormat.Pptx2013);
}
}
}
