Class: HexaPDF::CLI::Watermark

Inherits:
Command
  • Object
show all
Defined in:
lib/hexapdf/cli/watermark.rb

Overview

Uses one or more pages of one PDF and underlays/overlays it/them onto another.

Instance Method Summary collapse

Methods included from Command::Extensions

#help, #help_banner

Constructor Details

#initialize ⇒ Watermark

:nodoc:



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# File 'lib/hexapdf/cli/watermark.rb', line 45

def initialize #:nodoc:
  super('watermark', takes_commands: false)
  short_desc("Put one or more PDF pages onto another PDF")
  long_desc("    This command uses one ore more pages from a PDF file and applies them as background or\n    stamp on another PDF file.\n\n    If multiple pages are selected from the watermark PDF, the --repeat option can be used to\n    specify how they should be applied: 'last' (the default) will only repeat the last\n    watermark page whereas 'all' will cyclically repeat all watermark pages.\n  EOF\n\n  options.on(\"-w\", \"--watermark-file FILE\", \"The PDF used as watermark\") do |watermark_file|\n    @watermark_file = watermark_file\n  end\n  options.on(\"-i\", \"--pages PAGES\", \"The pages of the watermark file that should be used \" \\\n             \"(default: 1)\") do |pages|\n    @pages = pages\n  end\n  options.on(\"-r\", \"--repeat REPEAT_MODE\", [:last, :all],\n             \"Specifies how the watermark pages should be repeated. Either last or \" \\\n               \"all (default: last)\") do |repeat|\n    @repeat = repeat\n  end\n  options.on(\"-t\", \"--type WATERMARK_TYPE\", [:background, :stamp],\n             \"Specifies how the watermark is applied: background applies it below the page \" \\\n               \"contents and stamp applies it above. Default: background\") do |type|\n    @type = (type == :background ? :underlay : :overlay)\n  end\n  options.on(\"--password PASSWORD\", \"-p\", String,\n             \"The password for decrypting the input PDF. Use - for reading from \" \\\n               \"standard input.\") do |pwd|\n    @password = (pwd == '-' ? read_password : pwd)\n  end\n  define_optimization_options\n  define_encryption_options\n\n  @watermark_file = nil\n  @pages = \"1\"\n  @repeat = :last\n  @type = :underlay\n  @password = nil\nend\n")

Instance Method Details

#execute(in_file, out_file) ⇒ Object

:nodoc:



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# File 'lib/hexapdf/cli/watermark.rb', line 89

def execute(in_file, out_file) #:nodoc:
  maybe_raise_on_existing_file(out_file)
  watermark = HexaPDF::Document.open(@watermark_file)
  indices = page_index_generator(watermark)
  xobject_map = {}
  with_document(in_file, password: @password, out_file: out_file) do |doc|
    doc.pages.each do |page|
      index = indices.next
      xobject = xobject_map[index] ||= doc.import(watermark.pages[index].to_form_xobject)
      pw = page.box.width.to_f
      ph = page.box.height.to_f
      xw = xobject.width.to_f
      xh = xobject.height.to_f
      canvas = page.canvas(type: @type)
      ratio = [pw / xw, ph / xh].min
      xw, xh = xw * ratio, xh * ratio
      x, y = (pw - xw) / 2, (ph - xh) / 2
      canvas.xobject(xobject, at: [x, y], width: xw, height: xh)
    end
  end
end