Module: PdfExtract::Zones

Defined in:
lib/analysis/zones.rb

Class Method Summary collapse

Class Method Details

.include_in(pdf) ⇒ Object 



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# File 'lib/analysis/zones.rb', line 14

def self.include_in pdf
  deps = [:top_margins, :left_margins, :right_margins, :bottom_margins, :regions]
  pdf.spatials :zones, :paged => true, :depends_on => deps do |parser|
    y_mask = MultiRange.new
    t_margin = nil
    b_margin = nil
    left_margin_x = 0
    right_margin_x = 0

    parser.before do
      y_mask = MultiRange.new
    end

    parser.objects :left_margins do |lm|
      left_margin_x = lm[:x] + lm[:width]
    end

    parser.objects :right_margins do |rm|
      right_margin_x = rm[:x]
    end

    parser.objects :top_margins do |m|
      t_margin = m
    end

    parser.objects :bottom_margins do |m|
      b_margin = m
    end

    parser.objects :regions do |r|
      y_mask.append r[:y]..(r[:y] + r[:height])
    end

    parser.after do
      # Mask out a middle chunk of the document.
      marginless_height = t_margin[:y] - (b_margin[:y] + b_margin[:height])
      a = (marginless_height - (marginless_height * pdf.settings[:body_ratio])) / 2
      y_mask.append((b_margin[:y] + b_margin[:height] + a)..(t_margin[:y] - a))
      
      objs = []
      
      if y_mask.count < 2
        objs << {
          :group => :bodies,
          :x => left_margin_x,
          :y => b_margin[:y] + b_margin[:height],
          :width => right_margin_x - left_margin_x,
          :height => t_margin[:y] - (b_margin[:y] + b_margin[:height])
        }
      elsif y_mask.count < 3
        top = {
          :x => left_margin_x,
          :y => y_mask.max_excluded,
          :width => right_margin_x - left_margin_x,
          :height => t_margin[:y] - y_mask.max_excluded
        }

        bottom = {
          :x => left_margin_x,
          :y => b_margin[:y] + b_margin[:height],
          :width => right_margin_x - left_margin_x,
          :height => top[:y] - (b_margin[:y] + b_margin[:height])
        }

        if top[:height] > bottom[:height]
          top[:group] = :bodies
          bottom[:group] = :footers
        else
          top[:group] = :headers
          bottom[:group] = :bodies
        end

        objs += [top, bottom]
      else
        header = {
          :group => :headers,
          :x => left_margin_x,
          :y => y_mask.max_excluded,
          :width => right_margin_x - left_margin_x,
          :height => t_margin[:y] - y_mask.max_excluded
        }

        footer = {
          :group => :footers,
          :x => left_margin_x,
          :y => b_margin[:y] + b_margin[:height],
          :width => right_margin_x - left_margin_x,
          :height => y_mask.min_excluded - (b_margin[:y] + b_margin[:height])
        }

        body = {
          :group => :bodies,
          :x => left_margin_x,
          :y => footer[:y] + footer[:height],
          :width => right_margin_x - left_margin_x,
          :height => header[:y] - (footer[:y] + footer[:height])
        }

        objs += [header, body, footer]
      end

      page_base = {
        :page => t_margin[:page],
        :page_width => t_margin[:page_width],
        :page_height => t_margin[:page_height]
      }
      
      objs.map { |o| page_base.merge o }
    end
  end

  pdf.spatials :headers, :depends_on => [:zones]
  pdf.spatials :footers, :depends_on => [:zones]
  pdf.spatials :bodies, :depends_on => [:zones]
end