DataFlex 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. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPdf
    Variant vJson
    Handle hoJson
    Variant vJsonOut
    Handle hoJsonOut
    String sTemp1
    String sTemp2

    Move False To iSuccess

    //  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

    Get Create (RefClass(cComChilkatPdf)) To hoPdf
    If (Not(IsComObjectCreated(hoPdf))) Begin
        Send CreateComObject of hoPdf
    End
    Get ComLoadFile Of hoPdf "qa_data/pdf/long_report.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateString Of hoJson "type" "text" To iSuccess

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

    Get ComUpdateBool Of hoJson "tile.enabled" True To iSuccess
    Get ComUpdateNumber Of hoJson "tile.spacingX" "60" To iSuccess
    Get ComUpdateNumber Of hoJson "tile.spacingY" "80" To iSuccess
    Get ComUpdateBool Of hoJson "tile.stagger" True To iSuccess

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonOut
    If (Not(IsComObjectCreated(hoJsonOut))) Begin
        Send CreateComObject of hoJsonOut
    End
    Get pvComObject of hoJson to vJson
    Get pvComObject of hoJsonOut to vJsonOut
    Get ComWatermark Of hoPdf "add" vJson vJsonOut To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStringOf Of hoJsonOut "id" To sTemp1
    Get ComStringOf Of hoJsonOut "pages" To sTemp2
    Showln "id: " sTemp1 " pages: " sTemp2

    Get ComWriteFile Of hoPdf "qa_output/report_traced.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Sample output:

    //  id: trace pages: 1-3


End_Procedure