Xojo Plugin 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. Xojo Plugin

Dim success As Boolean
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

Dim pdf As New Chilkat.Pdf
success = pdf.LoadFile("qa_data/pdf/long_report.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

Dim json As New Chilkat.JsonObject
success = 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.
success = json.UpdateString("text","jdoe@example.com  {date:yyyy-MM-dd}")
success = json.UpdateString("id","trace")
success = json.UpdateString("zOrder","back")
success = json.UpdateNumber("font.size","14")
success = json.UpdateNumber("opacity","0.15")
success = json.UpdateNumber("rotation","30")

success = json.UpdateBool("tile.enabled",True)
success = json.UpdateNumber("tile.spacingX","60")
success = json.UpdateNumber("tile.spacingY","80")
success = json.UpdateBool("tile.stagger",True)

Dim jsonOut As New Chilkat.JsonObject
success = pdf.Watermark("add",json,jsonOut)
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

System.DebugLog("id: " + jsonOut.StringOf("id") + " pages: " + jsonOut.StringOf("pages"))

success = pdf.WriteFile("qa_output/report_traced.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

//  Sample output:

//  id: trace pages: 1-3