向图表系列的数据点添加自定义标签

您可以向图表系列的数据点添加自定义标签。Aspose.Cells提供了ChartPoint.getDataLabels().setText() 属性来添加这些自定义标签。本文将解释如何使用此属性将自定义标签添加到图表系列的数据点。

向图表系列的数据点添加自定义标签

以下代码创建了一条连线连接的散点图并向图表系列的数据点添加了自定义标签。每个自定义标签显示系列名称和点名称。您可以使用其他文本来代替。代码执行后，创建了以下Excel文件。正如您在图表内看到的，每个数据点都设置了自定义标签。

// 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(AddCustomLabelsToDataPoints.class);
Workbook workbook = new Workbook(FileFormatType.XLSX);
Worksheet sheet = workbook.getWorksheets().get(0);

// Put data
sheet.getCells().get(0, 0).putValue(1);
sheet.getCells().get(0, 1).putValue(2);
sheet.getCells().get(0, 2).putValue(3);

sheet.getCells().get(1, 0).putValue(4);
sheet.getCells().get(1, 1).putValue(5);
sheet.getCells().get(1, 2).putValue(6);

sheet.getCells().get(2, 0).putValue(7);
sheet.getCells().get(2, 1).putValue(8);
sheet.getCells().get(2, 2).putValue(9);

// Generate the chart
int chartIndex = sheet.getCharts().add(ChartType.SCATTER_CONNECTED_BY_LINES_WITH_DATA_MARKER, 5, 1, 24, 10);
Chart chart = sheet.getCharts().get(chartIndex);

chart.getTitle().setText("Test");
chart.getCategoryAxis().getTitle().setText("X-Axis");
chart.getValueAxis().getTitle().setText("Y-Axis");

chart.getNSeries().setCategoryData("A1:C1");

// Insert series
chart.getNSeries().add("A2:C2", false);

Series series = chart.getNSeries().get(0);

int pointCount = series.getPoints().getCount();
for (int i = 0; i < pointCount; i++) {
	ChartPoint pointIndex = series.getPoints().get(i);

	pointIndex.getDataLabels().setText("Series 1" + "\n" + "Point " + i);
}

// Insert series
chart.getNSeries().add("A3:C3", false);

series = chart.getNSeries().get(1);

pointCount = series.getPoints().getCount();
for (int i = 0; i < pointCount; i++) {
	ChartPoint pointIndex = series.getPoints().get(i);

	pointIndex.getDataLabels().setText("Series 2" + "\n" + "Point " + i);
}

workbook.save(dataDir + "Test.xlsx", SaveFormat.XLSX);