Overlay Comparison

To perform an overlay comparison, proceed as follows:

1. Open the two documents being compared.

2. Create the CPDFCompareDrawings object.

3. Set the colour and other properties of the comparison.

4. Call compareDrawings.getDocGenerate() to get the comparison results and save them to the document.

This example shows how to add an overlay comparison：

CPDFDocument baseDocument = new CPDFDocument();
baseDocument.open(rootDir + "/TestFiles/comparefile.pdf");
CPDFDocument comDocument = new CPDFDocument();
comDocument.open(rootDir + "/TestFiles/comparefile1.pdf");
printDividingLine();

CPDFCompareDrawings compareDrawings = baseDocument.createCompareDrawings(comDocument);
compareDrawings.setBlendMode(4);
compareDrawings.setColorCompare(Color.decode("#FBBDBF").getRGB());
compareDrawings.setColorCompared(Color.decode("#93B9FD").getRGB());
compareDrawings.setFillAlphaCompare(50);
compareDrawings.setFillAlphaCompared(50);
compareDrawings.compareContent();
CPDFDocument document = compareDrawings.getDocGenerate();
document.save(rootDir + "/out/compareTestOverlay.pdf", CPDFDocument.PDFDocumentSaveType.PDFDocumentSaveNoIncremental);