Custom Slice or Sector Colors in Pie Chart

This article explains how to add custom colors to pie chart slices/sectors. By default, pie charts use the Microsoft Excel default template. To use other colors, it is possible to redefine the colors in the chart.

To set the custom color for a pie chart’s individual slices or sectors:

1. Access the Series object’s ChartPoint.
2. Assign a color of your choice using the ChartPoint.getArea().setForegroundColor() method.

This article also explains how to set:

• A chart’s category data.
• A chart title linked to a cell.
• The chart title font settings.
• The position of the legend.

ChartPoint.getArea().setForegroundColor() is not specific to pie charts but can be used for all types of charts.

Custom slice colors in the pie chart

// 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(CustomSliceOrSectorColorsPieChart.class);
// Create a workbook object from the template file
Workbook workbook = new Workbook();

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

// Put the sample values used in a pie chart
worksheet.getCells().get("C3").putValue("India");
worksheet.getCells().get("C4").putValue("China");
worksheet.getCells().get("C5").putValue("United States");
worksheet.getCells().get("C6").putValue("Russia");
worksheet.getCells().get("C7").putValue("United Kingdom");
worksheet.getCells().get("C8").putValue("Others");

// Put the sample values used in a pie chart
worksheet.getCells().get("D2").putValue("% of world population");
worksheet.getCells().get("D3").putValue(25);
worksheet.getCells().get("D4").putValue(30);
worksheet.getCells().get("D5").putValue(10);
worksheet.getCells().get("D6").putValue(13);
worksheet.getCells().get("D7").putValue(9);
worksheet.getCells().get("D8").putValue(13);

// Create a pie chart with desired length and width
int pieIdx = worksheet.getCharts().add(ChartType.PIE, 1, 6, 15, 14);

// Access the pie chart
Chart pie = worksheet.getCharts().get(pieIdx);

// Set the pie chart series
pie.getNSeries().add("D3:D8", true);

// Set the category data
pie.getNSeries().setCategoryData("=Sheet1!$C$3:$C$8");

// Set the chart title that is linked to cell D2
pie.getTitle().setLinkedSource("D2");

// Set the legend position at the bottom.
pie.getLegend().setPosition(LegendPositionType.BOTTOM);

// Set the chart title's font name and color
pie.getTitle().getFont().setName("Calibri");
pie.getTitle().getFont().setSize(18);

// Access the chart series
Series srs = pie.getNSeries().get(0);

// Color the indvidual points with custom colors
srs.getPoints().get(0).getArea().setForegroundColor(com.aspose.cells.Color.fromArgb(0, 246, 22, 219));
srs.getPoints().get(1).getArea().setForegroundColor(com.aspose.cells.Color.fromArgb(0, 51, 34, 84));
srs.getPoints().get(2).getArea().setForegroundColor(com.aspose.cells.Color.fromArgb(0, 46, 74, 44));
srs.getPoints().get(3).getArea().setForegroundColor(com.aspose.cells.Color.fromArgb(0, 19, 99, 44));
srs.getPoints().get(4).getArea().setForegroundColor(com.aspose.cells.Color.fromArgb(0, 208, 223, 7));
srs.getPoints().get(5).getArea().setForegroundColor(com.aspose.cells.Color.fromArgb(0, 222, 69, 8));

// Autofit all columns
worksheet.autoFitColumns();

// Save the workbook
workbook.save(dataDir + "output.xlsx", SaveFormat.XLSX);