Creazione di un Grafico a Torta con Linee di Leader con C++

Questo articolo spiega come creare un grafico a torta con linee di leader da zero utilizzando l’API Aspose.Cells for C++. In Excel, l’opzione ‘Mostra linee di leader’ è impostata di default, quindi quando si crea un grafico a torta in Excel le linee di leader sono visualizzate. Tuttavia, durante la creazione di un grafico simile con le API di Aspose.Cells, devi impostare esplicitamente la proprietà Series.GetHasLeaderLines().

Per dimostrare l’uso dell’API Aspose.Cells for C++ per creare un grafico a torta con linee di leader, creeremo prima un nuovo Workbook e inseriremo alcuni dati che fungeranno da fonte dei dati della serie. Una volta che i dati sono pronti, aggiungeremo un Chart di tipo ChartType.Pie alla raccolta di grafici e imposteremo i suoi vari aspetti per ottenere la vista desiderata del grafico.

#include <iostream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;

int main()
{
    Aspose::Cells::Startup();

    // Source directory path
    U16String srcDir(u"..\\Data\\01_SourceDirectory\\");

    // Output directory path
    U16String outDir(u"..\\Data\\02_OutputDirectory\\");

    // Create an instance of Workbook in XLSX format
    Workbook workbook(FileFormatType::Xlsx);

    // Access the first worksheet
    Worksheet worksheet = workbook.GetWorksheets().Get(0);

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

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

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

    // Access newly created Chart instance
    Chart chart = worksheet.GetCharts().Get(id);

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

    // Set category data range
    chart.GetNSeries().SetCategoryData(u"A1:A16");

    // Turn off legend
    chart.SetShowLegend(false);

    // Access data labels
    DataLabels dataLabels = chart.GetNSeries().Get(0).GetDataLabels();

    // Turn on category names
    dataLabels.SetShowCategoryName(true);

    // Turn on percentage format
    dataLabels.SetShowPercentage(true);

    // Set position
    dataLabels.SetPosition(LabelPositionType::OutsideEnd);

    // Set separator
    dataLabels.SetSeparatorType(DataLabelsSeparatorType::Comma);

    // Save the workbook
    workbook.Save(outDir + u"PieChart_out.xlsx");

    std::cout << "Pie chart created successfully!" << std::endl;

    Aspose::Cells::Cleanup();
}

Finora abbiamo creato un grafico a torta e ne abbiamo impostato gli aspetti differenti. Ora stiamo per attivare i capi di linea per il grafico. Si noti, per mostrare i capi di linea, dobbiamo spostare leggermente le etichette dei dati.

Il seguente pezzo di codice attiva i capi di linea, aggiorna il grafico e quindi calcola le posizioni delle etichette dei dati per spostarle di conseguenza.

#include <iostream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;
using namespace Aspose::Cells::Charts;

int main()
{
    Aspose::Cells::Startup();

    // Create an instance of Workbook in XLSX format
    Workbook workbook(FileFormatType::Xlsx);

    // Access the first worksheet
    Worksheet worksheet = workbook.GetWorksheets().Get(0);

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

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

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

    // Access newly created Chart instance
    Chart chart = worksheet.GetCharts().Get(id);

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

    // Set category data range
    chart.GetNSeries().SetCategoryData(u"A1:A16");

    // Turn off legend
    chart.SetShowLegend(false);

    // Access data labels
    DataLabels dataLabels = chart.GetNSeries().Get(0).GetDataLabels();

    // Turn on category names
    dataLabels.SetShowCategoryName(true);

    // Turn on percentage format
    dataLabels.SetShowPercentage(true);

    // Set position
    dataLabels.SetPosition(LabelPositionType::OutsideEnd);

    // Set separator
    dataLabels.SetSeparatorType(DataLabelsSeparatorType::Comma);

    // Turn on leader lines
    chart.GetNSeries().Get(0).SetHasLeaderLines(true);

    // Calculate 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.GetNSeries().Get(0).GetPoints().GetCount(); i++)
    {
        int X = chart.GetNSeries().Get(0).GetPoints().Get(i).GetDataLabels().GetX();
        // 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.GetNSeries().Get(0).GetPoints().Get(i).GetDataLabels().SetX(X + DELTA);
        else
            chart.GetNSeries().Get(0).GetPoints().Get(i).GetDataLabels().SetX(X - DELTA);
    }

    // Save the workbook
    workbook.Save(u"output.xlsx");

    Aspose::Cells::Cleanup();
}

Infine, il seguente codice salva il grafico in formato immagine e il workbook in formato XLSX.

#include <iostream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;
using namespace Aspose::Cells::Charts;
using namespace Aspose::Cells::Drawing;

int main()
{
    Aspose::Cells::Startup();

    // Create an instance of Workbook in XLSX format
    Workbook workbook(FileFormatType::Xlsx);

    // Access the first worksheet
    Worksheet worksheet = workbook.GetWorksheets().Get(0);

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

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

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

    // Access newly created Chart instance
    Chart chart = worksheet.GetCharts().Get(id);

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

    // Set category data range
    chart.GetNSeries().SetCategoryData(u"A1:A16");

    // Turn off legend
    chart.SetShowLegend(false);

    // Access data labels
    DataLabels dataLabels = chart.GetNSeries().Get(0).GetDataLabels();

    // Turn on category names
    dataLabels.SetShowCategoryName(true);

    // Turn on percentage format
    dataLabels.SetShowPercentage(true);

    // Set position
    dataLabels.SetPosition(LabelPositionType::OutsideEnd);

    // Set separator
    dataLabels.SetSeparatorType(DataLabelsSeparatorType::Comma);

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

    // Set image format
    anOption.SetImageType(ImageType::Png);

    // Set resolution
    anOption.SetHorizontalResolution(200);
    anOption.SetVerticalResolution(200);

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

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

    Aspose::Cells::Cleanup();
}

Grafico a torta risultante

Argomenti avanzati

• Colori delle fette personalizzate in un grafico a torta
• Verifica se i punti dati sono nel secondo grafico a torta o a barre su un grafico di torta o barre di un grafico a torta

Articoli correlati

• Creazione di grafici
• Personalizzazione di Grafici
• Formattazione dei dati nei grafici
• Impostazione dell’aspetto del grafico