Création d’un graphique en anneau avec lignes de leader en utilisant Node.js via C++

Pour démontrer l’utilisation de l’API Aspose.Cells for Node.js via C++ pour créer un graphique en anneau avec lignes de leader, nous commencerons par créer un nouveau Workbook et y insérer des données qui serviront de source de données de la série. Une fois les données en place, nous ajouterons un Chart de type ChartType.Pie au collection de graphiques et définirons ses différents aspects pour obtenir la vue souhaitée du graphique.

const path = require("path");
const AsposeCells = require("aspose.cells.node");

// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
const filePath = path.join(dataDir, "sample.xlsx");
// Loads the workbook which contains hidden external links
const workbook = new AsposeCells.Workbook(filePath);

// Access the first worksheet
const 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
const id = worksheet.getCharts().add(AsposeCells.ChartType.Pie, 3, 3, 23, 13);

// Access newly created Chart instance
const 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
const dataLabels = chart.getNSeries().get(0).getDataLabels();

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

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

// Set position
dataLabels.setPosition(AsposeCells.LabelPositionType.OutsideEnd);

// Set separator
dataLabels.setSeparatorType(AsposeCells.DataLabelsSeparatorType.Comma);

Jusqu’à présent, nous avons créé un graphique circulaire et réglé ses différents aspects. Maintenant, nous allons activer les lignes de repère pour le graphique. Veuillez noter que pour afficher les lignes de repère, nous devons déplacer légèrement les étiquettes de données.

Le code suivant active les lignes de repère, actualise le graphique, puis calcule les positions des étiquettes de données pour les déplacer en conséquence.

const AsposeCells = require("aspose.cells.node");
const path = require("path");

// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
const filePath = path.join(dataDir, "sample.xlsx");
// Loads the workbook which contains hidden external links
const workbook = new AsposeCells.Workbook(filePath);

// Access the first worksheet
const 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
const id = worksheet.getCharts().add(AsposeCells.ChartType.Pie, 3, 3, 23, 13);

// Access newly created Chart instance
const 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
const dataLabels = chart.getNSeries().get(0).getDataLabels();

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

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

// Set position
dataLabels.setPosition(AsposeCells.LabelPositionType.OutsideEnd);

// Set separator
dataLabels.setSeparatorType(AsposeCells.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
const DELTA = 100;
for (let i = 0; i < chart.getNSeries().get(0).getPoints().getCount(); i++) {
let 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);
}

Enfin, le code suivant sauvegarde le graphique au format image et le classeur au format XLSX.

const path = require("path");
const AsposeCells = require("aspose.cells.node");

// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
const filePath = path.join(dataDir, "sample.xlsx");

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

// Access the first worksheet
const 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
const id = worksheet.getCharts().add(AsposeCells.ChartType.Pie, 3, 3, 23, 13);

// Access newly created Chart instance
const 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
const dataLabels = chart.getNSeries().get(0).getDataLabels();

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

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

// Set position
dataLabels.setPosition(AsposeCells.LabelPositionType.OutsideEnd);

// Set separator
dataLabels.setSeparatorType(AsposeCells.DataLabelsSeparatorType.Comma);

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

// Set image format
anOption.setImageType(AsposeCells.ImageType.Png);

// Set resolution
anOption.setHorizontalResolution(200);
anOption.setVerticalResolution(200);

// Render chart to image
chart.toImage(path.join(dataDir, "output_out.png"), anOption);

// Save the workbook to see chart inside the Excel
workbook.save(path.join(dataDir, "output_out.xlsx"));
Diagramme circulaire résultant
todo:image_alt_text

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