aashish/show_char_boxes.rb

## show_char_boxes.rb
require 'hexapdf'

class ShowTextProcessor < HexaPDF::Content::Processor

  def initialize(page)
    super()
    @canvas = page.canvas(type: :overlay)
  end

  def show_text(str)
    boxes = decode_text_with_positioning(str)
    return if boxes.string.empty?

    @canvas.line_width = 1
    @canvas.stroke_color(224, 0, 0)
    # Polyline for transformed characters
    #boxes.each {|box| @canvas.polyline(*box.points).close_subpath.stroke}
    # Using rectangles is faster but not 100% correct
    boxes.each do |box|
      x, y = *box.lower_left
      tx, ty = *box.upper_right
      @canvas.rectangle(x, y, tx - x, ty - y).stroke
    end

    @canvas.line_width = 0.5
    @canvas.stroke_color(0, 224, 0)
    @canvas.polyline(*boxes.lower_left, *boxes.lower_right,
                     *boxes.upper_right, *boxes.upper_left).close_subpath.stroke
  end
  alias :show_text_with_positioning :show_text

end

doc = HexaPDF::Document.open(ARGV.shift)
doc.pages.each_with_index do |page, index|
  puts "Processing page #{index + 1}"
  processor = ShowTextProcessor.new(page)
  processor.graphics_state.font = doc.add(Type: :Font, Subtype: :Type1, Encoding: :WinAnsiEncoding, BaseFont: :"Times-Roman")
  processor.graphics_state.tm = HexaPDF::Content::TransformationMatrix.new

  page.process_contents(processor)
  puts processor.show_text('name')
end
doc.write("#{File.expand_path(File.dirname(__FILE__))}/show_char_boxes.pdf", optimize: true)
	require 'hexapdf'

	class ShowTextProcessor < HexaPDF::Content::Processor

	def initialize(page)
	super()
	@canvas = page.canvas(type: :overlay)
	end

	def show_text(str)
	boxes = decode_text_with_positioning(str)
	return if boxes.string.empty?

	@canvas.line_width = 1
	@canvas.stroke_color(224, 0, 0)
	# Polyline for transformed characters
	#boxes.each {\|box\| @canvas.polyline(*box.points).close_subpath.stroke}
	# Using rectangles is faster but not 100% correct
	boxes.each do \|box\|
	x, y = *box.lower_left
	tx, ty = *box.upper_right
	@canvas.rectangle(x, y, tx - x, ty - y).stroke
	end

	@canvas.line_width = 0.5
	@canvas.stroke_color(0, 224, 0)
	@canvas.polyline(boxes.lower_left, boxes.lower_right,
	boxes.upper_right, boxes.upper_left).close_subpath.stroke
	end
	alias :show_text_with_positioning :show_text

	end

	doc = HexaPDF::Document.open(ARGV.shift)
	doc.pages.each_with_index do \|page, index\|
	puts "Processing page #{index + 1}"
	processor = ShowTextProcessor.new(page)
	processor.graphics_state.font = doc.add(Type: :Font, Subtype: :Type1, Encoding: :WinAnsiEncoding, BaseFont: :"Times-Roman")
	processor.graphics_state.tm = HexaPDF::Content::TransformationMatrix.new

	page.process_contents(processor)
	puts processor.show_text('name')
	end
	doc.write("#{File.expand_path(File.dirname(__FILE__))}/show_char_boxes.pdf", optimize: true)