C++ Requires Chilkat v11.7.0+

Tile a Watermark Across a PDF Page

See more PDF Watermark Examples

Demonstrates a tiled watermark, which repeats the stamp over the whole page instead of placing it once. Tiling overrides position.align; tile.spacingX and spacingY set the gaps, and tile.stagger offsets alternate rows by half a tile so the pattern does not line up in columns. A faint tiled stamp carrying the name or address is the usual way to mark a document so that a leaked copy can be traced back, and zOrder back keeps it behind the text where it does not hinder reading. C++

#include <CkPdf.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  The PDF used in this example is available at long_report.pdf

    CkPdf pdf;
    success = pdf.LoadFile("qa_data/pdf/long_report.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json;
    json.UpdateString("type","text");

    //  {date:FORMAT} is replaced per page when the watermark is added.  The other placeholders are
    //  {page}, {pages} and {filename}; {{ gives a literal brace.
    json.UpdateString("text","jdoe@example.com  {date:yyyy-MM-dd}");
    json.UpdateString("id","trace");
    json.UpdateString("zOrder","back");
    json.UpdateNumber("font.size","14");
    json.UpdateNumber("opacity","0.15");
    json.UpdateNumber("rotation","30");

    json.UpdateBool("tile.enabled",true);
    json.UpdateNumber("tile.spacingX","60");
    json.UpdateNumber("tile.spacingY","80");
    json.UpdateBool("tile.stagger",true);

    CkJsonObject jsonOut;
    success = pdf.Watermark("add",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "id: " << jsonOut.stringOf("id") << " pages: " << jsonOut.stringOf("pages") << "\r\n";

    success = pdf.WriteFile("qa_output/report_traced.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    //  Sample output:

    //  id: trace pages: 1-3
    }