// 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.getSharedDataDir(AddWordArtWatermarkToChart.class) + "articles/";
// Instantiate a new workbook, Open the existing excel file.

Workbook workbook = new Workbook(dataDir + "sample.xlsx");

// Get the chart in the first worksheet.
Chart chart = workbook.getWorksheets().get(0).getCharts().get(0);

// Add a WordArt watermark (shape) to the chart's plot area.
Shape wordart = chart.getShapes().addTextEffectInChart(MsoPresetTextEffect.TEXT_EFFECT_1, "CONFIDENTIAL",
		"Arial Black", 66, false, false, 1200, 500, 2000, 3000);

// Get the shape's fill format.
FillFormat wordArtFormat = wordart.getFill();

// Set the transparency.
wordArtFormat.setTransparency(0.9);

// Get the line format.
LineFormat lineFormat = wordart.getLine();

// Set Line format to invisible.
lineFormat.setWeight(0.0);

// Save the excel file.
workbook.save(dataDir + "AWArtWToC_out.xlsx");