通过C++在Node.js中设置数据源
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在之前的主题中，我们已提供许多示例来演示如何为图表设置数据源，但在本主题中，我们将提供更多关于可以为图表设置的数据类型的详细信息。
设置图表数据
使用Aspose.Cells处理图表时，有以下两种数据类型需要处理：
- 图表数据。
- 类别数据。
图表数据
图表数据是我们用作数据源来构建图表的数据。我们可以通过调用SeriesCollection对象的add(string, boolean)方法添加包含图表数据的单元格范围。
const path = require("path");
const AsposeCells = require("aspose.cells.node");
// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
// Instantiating a Workbook object
const workbook = new AsposeCells.Workbook();
// Adding a new worksheet to the Excel object
const sheetIndex = workbook.getWorksheets().add();
// Obtaining the reference of the newly added worksheet by passing its sheet index
const worksheet = workbook.getWorksheets().get(sheetIndex);
// Adding sample values to cells
worksheet.getCells().get("A1").putValue(50);
worksheet.getCells().get("A2").putValue(100);
worksheet.getCells().get("A3").putValue(170);
worksheet.getCells().get("A4").putValue(300);
worksheet.getCells().get("B1").putValue(160);
worksheet.getCells().get("B2").putValue(32);
worksheet.getCells().get("B3").putValue(50);
worksheet.getCells().get("B4").putValue(40);
// Adding sample values to cells as category data
worksheet.getCells().get("C1").putValue("Q1");
worksheet.getCells().get("C2").putValue("Q2");
worksheet.getCells().get("C3").putValue("Y1");
worksheet.getCells().get("C4").putValue("Y2");
// Adding a chart to the worksheet
const chartIndex = worksheet.getCharts().add(AsposeCells.ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
const chart = worksheet.getCharts().get(chartIndex);
// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B4"
chart.getNSeries().add("A1:B4", true);
// Saving the Excel file
workbook.save(path.join(dataDir, "output.xls"));
分类数据
类别数据用于标签化图表数据，可以使用其getCategoryData()属性添加到SeriesCollection。下面给出一个完整示例，演示如何使用图表和类别数据。执行上述示例代码后，工作表中将添加一个柱状图，如下所示。
const path = require("path");
const AsposeCells = require("aspose.cells.node");
// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
// Instantiating a Workbook object
const workbook = new AsposeCells.Workbook();
// Adding a new worksheet to the Excel object
const sheetIndex = workbook.getWorksheets().add();
// Obtaining the reference of the newly added worksheet by passing its sheet index
const worksheet = workbook.getWorksheets().get(sheetIndex);
// Adding sample values to cells
worksheet.getCells().get("A1").putValue(10);
worksheet.getCells().get("A2").putValue(100);
worksheet.getCells().get("A3").putValue(170);
worksheet.getCells().get("A4").putValue(200);
worksheet.getCells().get("B1").putValue(120);
worksheet.getCells().get("B2").putValue(320);
worksheet.getCells().get("B3").putValue(50);
worksheet.getCells().get("B4").putValue(40);
// Adding sample values to cells as category data
worksheet.getCells().get("C1").putValue("Q1");
worksheet.getCells().get("C2").putValue("Q2");
worksheet.getCells().get("C3").putValue("Y1");
worksheet.getCells().get("C4").putValue("Y2");
// Adding a chart to the worksheet
const chartIndex = worksheet.getCharts().add(AsposeCells.ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
const chart = worksheet.getCharts().get(chartIndex);
// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B4"
chart.getNSeries().add("A1:B4", true);
// Setting the data source for the category data of SeriesCollection
chart.getNSeries().setCategoryData("C1:C4");
// Saving the Excel file
workbook.save(path.join(dataDir, "output.xls"));