Creazione di un grafico a torta con linee guida

Questo articolo spiega come creare un grafico a torta con linee guida da zero utilizzando Aspose.Cells for .NET API. In Excel, l’opzione “Mostra linee guida” è impostata per impostazione predefinita, quindi quando crei un grafico a torta in Excel vengono mostrate le linee guida. Tuttavia, durante la creazione di un grafico simile con le API Aspose.Cells, è necessario impostare in modo esplicito il fileSeries.HasLeaderLines proprietà.

Per dimostrare l’utilizzo di Aspose.Cells for .NET API per creare un grafico a torta con linee guida, creeremo prima un nuovoCartella di lavoro e inserisci alcuni dati che serviranno come origine dati della serie. Una volta inseriti i dati, aggiungeremo aGrafico di tipoChartType.Piealla raccolta di grafici e impostarne i diversi aspetti per ottenere la vista del grafico desiderata.

// 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;

Finora abbiamo creato un grafico a torta e impostato i suoi diversi aspetti. Ora attiveremo le linee guida per il grafico. Si prega di notare che per mostrare le linee guida, dobbiamo spostare leggermente le etichette dei dati.

La parte di codice seguente attiva le linee direttrici, aggiorna il grafico e quindi calcola le posizioni delle etichette dei dati per spostarle di conseguenza.

// 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;
}

Infine, il codice seguente salva il grafico in formato immagine e la cartella di lavoro in formato XLSX.

// 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");

Grafico a torta risultante

Argomenti avanzati

• Colori di sezioni o settori personalizzati nel grafico a torta
• Scopri se i punti dati si trovano nella seconda torta o barra su un grafico a torta o a barre

articoli Correlati

• Creazione di grafici
• Personalizzare i grafici
• Formattazione dei dati nei grafici
• Impostazione dell’aspetto del grafico