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 Java 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.

Creazione di un grafico a torta con linee guida

Per dimostrare l’utilizzo di Aspose.Cells for Java 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 tipoTortaalla 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-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir(CreatePieChartWithLeaderLines.class);
// Create an instance of Workbook in XLSX format
Workbook workbook = new Workbook(FileFormatType.XLSX);

// Access the first worksheet
Worksheet worksheet = workbook.getWorksheets().get(0);

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

worksheet.getCells().get("B1").putValue(10.4);
worksheet.getCells().get("B2").putValue(5.2);
worksheet.getCells().get("B3").putValue(6.4);
worksheet.getCells().get("B4").putValue(10.4);
worksheet.getCells().get("B5").putValue(7.9);
worksheet.getCells().get("B6").putValue(4.1);
worksheet.getCells().get("B7").putValue(3.5);
worksheet.getCells().get("B8").putValue(5.7);
worksheet.getCells().get("B9").putValue(3);
worksheet.getCells().get("B10").putValue(14.7);
worksheet.getCells().get("B11").putValue(3.6);
worksheet.getCells().get("B12").putValue(2.8);
worksheet.getCells().get("B13").putValue(7.8);
worksheet.getCells().get("B14").putValue(2.4);
worksheet.getCells().get("B15").putValue(1.8);
worksheet.getCells().get("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("B1:B16", true);
// Set category data range
chart.getNSeries().setCategoryData("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.OUTSIDE_END);
// Set separator
dataLabels.setSeparator(DataLablesSeparatorType.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);
}
		
//In order to save the chart image, create an instance of ImageOrPrintOptions
ImageOrPrintOptions anOption = new ImageOrPrintOptions();
//Set image format
anOption.setImageFormat(ImageFormat.getPng());
//Set resolution
anOption.setHorizontalResolution(200);
anOption.setVerticalResolution(200);

//Render chart to image
chart.toImage(dataDir + "output.png", anOption);

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

Grafico a torta risultante

articoli Correlati

• Creazione e personalizzazione di grafici
• Formattazione del grafico