Adding a non-removable watermark to documents can discourage viewers from sharing your content or taking screenshots.
- To get the the CPDFWatermark at the specified index in this list, use function CPDFDocument.getWatermark(int index).
- To add a watermark, use function CPDFDocument.createWatermark(CPDFWatermark.Type type).
- To remove the watermark, use function CPDFWatermark.clear().
- To update the watermark, use function CPDFWatermark.update().
How to generate a PDF with a watermark on all its pages using the CPDFDocument API:
CPDFTextWatermark textWatermark = (CPDFTextWatermark) document.createWatermark(CPDFWatermark.Type.WATERMARK_TYPE_TEXT);
try {
if (textWatermark != null && textWatermark.isValid()) {
textWatermark.setText("Hello World");
textWatermark.setFontName("Helvetica");
textWatermark.setTextRGBColor(ColorUtils.parseColor(color));
textWatermark.setOpacity(0.5f);
textWatermark.setFontSize(30);
textWatermark.setFront(true);
textWatermark.setVertalign(CPDFWatermark.Vertalign.WATERMARK_VERTALIGN_CENTER);
textWatermark.setHorizalign(CPDFWatermark.Horizalign.WATERMARK_HORIZALIGN_CENTER);
textWatermark.setVertOffset(0);
textWatermark.setHorizOffset(0);
textWatermark.setScale(1.3f);
textWatermark.setPages("3,4,5");
textWatermark.setFullScreen(true);
textWatermark.setHorizontalSpacing(100);
textWatermark.setVerticalSpacing(100);
textWatermark.update();
}
} finally {
if (textWatermark != null && textWatermark.isValid()) {
textWatermark.release();
}
}