创建带引导线的饼图

本文介绍了如何使用 Aspose.Cells for .NET API 从头开始创建带引导线的饼图。在 Excel 中，默认设置“显示引导线”选项，因此当您在 Excel 中创建饼图时，会显示引导线。但是，在使用 Aspose.Cells API 创建类似图表时，您必须显式设置系列.HasLeaderLines财产。

为了演示 Aspose.Cells for .NET API 的用法来创建带有引导线的饼图，我们将首先创建一个新的工作簿并输入一些数据作为系列数据源。一旦数据到位，我们将添加一个图表类型ChartType.饼图到图表集合并设置其不同方面以获得所需的图表视图。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

// Create an instance of Workbook in XLSX format
Workbook workbook = new Workbook(FileFormatType.Xlsx);

// Access the first worksheet
Worksheet worksheet = workbook.Worksheets[0];

// Add two columns of data
worksheet.Cells["A1"].PutValue("Retail");
worksheet.Cells["A2"].PutValue("Services");
worksheet.Cells["A3"].PutValue("Info & Communication");
worksheet.Cells["A4"].PutValue("Transport Equip");
worksheet.Cells["A5"].PutValue("Construction");
worksheet.Cells["A6"].PutValue("Other Products");
worksheet.Cells["A7"].PutValue("Wholesale");
worksheet.Cells["A8"].PutValue("Land Transport");
worksheet.Cells["A9"].PutValue("Air Transport");
worksheet.Cells["A10"].PutValue("Electric Appliances");
worksheet.Cells["A11"].PutValue("Securities");
worksheet.Cells["A12"].PutValue("Textiles & Apparel");
worksheet.Cells["A13"].PutValue("Machinery");
worksheet.Cells["A14"].PutValue("Metal Products");
worksheet.Cells["A15"].PutValue("Cash");
worksheet.Cells["A16"].PutValue("Banks");

worksheet.Cells["B1"].PutValue(10.4);
worksheet.Cells["B2"].PutValue(5.2);
worksheet.Cells["B3"].PutValue(6.4);
worksheet.Cells["B4"].PutValue(10.4);
worksheet.Cells["B5"].PutValue(7.9);
worksheet.Cells["B6"].PutValue(4.1);
worksheet.Cells["B7"].PutValue(3.5);
worksheet.Cells["B8"].PutValue(5.7);
worksheet.Cells["B9"].PutValue(3);
worksheet.Cells["B10"].PutValue(14.7);
worksheet.Cells["B11"].PutValue(3.6);
worksheet.Cells["B12"].PutValue(2.8);
worksheet.Cells["B13"].PutValue(7.8);
worksheet.Cells["B14"].PutValue(2.4);
worksheet.Cells["B15"].PutValue(1.8);
worksheet.Cells["B16"].PutValue(10.1);

// Create a pie chart and add it to the collection of charts
int id = worksheet.Charts.Add(ChartType.Pie, 3, 3, 23, 13);

// Access newly created Chart instance
Chart chart = worksheet.Charts[id];

// Set series data range
chart.NSeries.Add("B1:B16", true);

// Set category data range
chart.NSeries.CategoryData = "A1:A16";

// Turn off legend
chart.ShowLegend = false;

// Access data labels
DataLabels dataLabels = chart.NSeries[0].DataLabels;

// Turn on category names
dataLabels.ShowCategoryName = true;

// Turn on percentage format
dataLabels.ShowPercentage = true;

// Set position
dataLabels.Position = LabelPositionType.OutsideEnd;

// Set separator
dataLabels.SeparatorType = DataLabelsSeparatorType.Comma;

到目前为止，我们已经创建了一个饼图并设置了它的不同方面。现在我们要打开图表的引导线。请注意，为了显示引导线，我们必须稍微移动数据标签。

以下代码段打开引导线，刷新图表，然后计算数据标签的位置以相应地移动它们。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// Create an instance of Workbook in XLSX format
Workbook workbook = new Workbook(FileFormatType.Xlsx);

// Access the first worksheet
Worksheet worksheet = workbook.Worksheets[0];

// Add two columns of data
worksheet.Cells["A1"].PutValue("Retail");
worksheet.Cells["A2"].PutValue("Services");
worksheet.Cells["A3"].PutValue("Info & Communication");
worksheet.Cells["A4"].PutValue("Transport Equip");
worksheet.Cells["A5"].PutValue("Construction");
worksheet.Cells["A6"].PutValue("Other Products");
worksheet.Cells["A7"].PutValue("Wholesale");
worksheet.Cells["A8"].PutValue("Land Transport");
worksheet.Cells["A9"].PutValue("Air Transport");
worksheet.Cells["A10"].PutValue("Electric Appliances");
worksheet.Cells["A11"].PutValue("Securities");
worksheet.Cells["A12"].PutValue("Textiles & Apparel");
worksheet.Cells["A13"].PutValue("Machinery");
worksheet.Cells["A14"].PutValue("Metal Products");
worksheet.Cells["A15"].PutValue("Cash");
worksheet.Cells["A16"].PutValue("Banks");

worksheet.Cells["B1"].PutValue(10.4);
worksheet.Cells["B2"].PutValue(5.2);
worksheet.Cells["B3"].PutValue(6.4);
worksheet.Cells["B4"].PutValue(10.4);
worksheet.Cells["B5"].PutValue(7.9);
worksheet.Cells["B6"].PutValue(4.1);
worksheet.Cells["B7"].PutValue(3.5);
worksheet.Cells["B8"].PutValue(5.7);
worksheet.Cells["B9"].PutValue(3);
worksheet.Cells["B10"].PutValue(14.7);
worksheet.Cells["B11"].PutValue(3.6);
worksheet.Cells["B12"].PutValue(2.8);
worksheet.Cells["B13"].PutValue(7.8);
worksheet.Cells["B14"].PutValue(2.4);
worksheet.Cells["B15"].PutValue(1.8);
worksheet.Cells["B16"].PutValue(10.1);

// Create a pie chart and add it to the collection of charts
int id = worksheet.Charts.Add(ChartType.Pie, 3, 3, 23, 13);

// Access newly created Chart instance
Chart chart = worksheet.Charts[id];

// Set series data range
chart.NSeries.Add("B1:B16", true);

// Set category data range
chart.NSeries.CategoryData = "A1:A16";

// Turn off legend
chart.ShowLegend = false;

// Access data labels
DataLabels dataLabels = chart.NSeries[0].DataLabels;

// Turn on category names
dataLabels.ShowCategoryName = true;

// Turn on percentage format
dataLabels.ShowPercentage = true;

// Set position
dataLabels.Position = LabelPositionType.OutsideEnd;

// Set separator
dataLabels.SeparatorType = DataLabelsSeparatorType.Comma;

// Turn on leader lines
chart.NSeries[0].HasLeaderLines = true;

// Calculete chart
chart.Calculate();

// You need to move DataLabels a little leftward or rightward depending on their position to show leader lines
int DELTA = 100;
for (int i = 0; i < chart.NSeries[0].Points.Count; i++)
{
    int X = chart.NSeries[0].Points[i].DataLabels.X;
    // If it is greater than 2000, then move the X position a little right otherwise move the X position a little left
    if (X > 2000)
        chart.NSeries[0].Points[i].DataLabels.X = X + DELTA;
    else
        chart.NSeries[0].Points[i].DataLabels.X = X - DELTA;
}

最后，以下代码将图表保存为图像格式，将工作簿保存为 XLSX 格式。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// Create an instance of Workbook in XLSX format
Workbook workbook = new Workbook(FileFormatType.Xlsx);

// Access the first worksheet
Worksheet worksheet = workbook.Worksheets[0];

// Add two columns of data
worksheet.Cells["A1"].PutValue("Retail");
worksheet.Cells["A2"].PutValue("Services");
worksheet.Cells["A3"].PutValue("Info & Communication");
worksheet.Cells["A4"].PutValue("Transport Equip");
worksheet.Cells["A5"].PutValue("Construction");
worksheet.Cells["A6"].PutValue("Other Products");
worksheet.Cells["A7"].PutValue("Wholesale");
worksheet.Cells["A8"].PutValue("Land Transport");
worksheet.Cells["A9"].PutValue("Air Transport");
worksheet.Cells["A10"].PutValue("Electric Appliances");
worksheet.Cells["A11"].PutValue("Securities");
worksheet.Cells["A12"].PutValue("Textiles & Apparel");
worksheet.Cells["A13"].PutValue("Machinery");
worksheet.Cells["A14"].PutValue("Metal Products");
worksheet.Cells["A15"].PutValue("Cash");
worksheet.Cells["A16"].PutValue("Banks");

worksheet.Cells["B1"].PutValue(10.4);
worksheet.Cells["B2"].PutValue(5.2);
worksheet.Cells["B3"].PutValue(6.4);
worksheet.Cells["B4"].PutValue(10.4);
worksheet.Cells["B5"].PutValue(7.9);
worksheet.Cells["B6"].PutValue(4.1);
worksheet.Cells["B7"].PutValue(3.5);
worksheet.Cells["B8"].PutValue(5.7);
worksheet.Cells["B9"].PutValue(3);
worksheet.Cells["B10"].PutValue(14.7);
worksheet.Cells["B11"].PutValue(3.6);
worksheet.Cells["B12"].PutValue(2.8);
worksheet.Cells["B13"].PutValue(7.8);
worksheet.Cells["B14"].PutValue(2.4);
worksheet.Cells["B15"].PutValue(1.8);
worksheet.Cells["B16"].PutValue(10.1);

// Create a pie chart and add it to the collection of charts
int id = worksheet.Charts.Add(ChartType.Pie, 3, 3, 23, 13);

// Access newly created Chart instance
Chart chart = worksheet.Charts[id];

// Set series data range
chart.NSeries.Add("B1:B16", true);

// Set category data range
chart.NSeries.CategoryData = "A1:A16";

// Turn off legend
chart.ShowLegend = false;

// Access data labels
DataLabels dataLabels = chart.NSeries[0].DataLabels;

// Turn on category names
dataLabels.ShowCategoryName = true;

// Turn on percentage format
dataLabels.ShowPercentage = true;

// Set position
dataLabels.Position = LabelPositionType.OutsideEnd;

// Set separator
dataLabels.SeparatorType = DataLabelsSeparatorType.Comma;

// In order to save the chart image, create an instance of ImageOrPrintOptions
ImageOrPrintOptions anOption = new ImageOrPrintOptions();

// Set image format
anOption.ImageType = Drawing.ImageType.Png;

// Set resolution
anOption.HorizontalResolution = 200;
anOption.VerticalResolution = 200;

// Render chart to image
chart.ToImage(dataDir + "output_out.png", anOption);

// Save the workbook to see chart inside the Excel
workbook.Save(dataDir + "output_out.xlsx");

结果饼图

推进主题

• 饼图中的自定义切片或扇区颜色
• 查找数据点是否位于饼图饼图或饼图条形图的第二个饼图或条形图中

相关文章

• 创建图表
• 自定义图表
• 图表中的数据格式
• 设置图表外观