Module: PdfExtract::Margins

Defined in:
lib/analysis/margins.rb

Class Method Summary collapse

Class Method Details

.axis_spatials(pdf, name, axis) ⇒ Object 



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# File 'lib/analysis/margins.rb', line 6

def self.axis_spatials pdf, name, axis
  pdf.spatials name, :paged => true, :depends_on => [:regions] do |parser|
    axis_mask = MultiRange.new
    page = -1
    page_width = 0
    page_height = 0

    dimension = :width if axis == :x
    dimension = :height if axis == :y

    parser.before do
      axis_mask = MultiRange.new
      page = -1
    end

    parser.objects :regions do |region|
      if page == -1
        page = region[:page]
        page_width = region[:page_width]
        page_height = region[:page_height]
      end
      
      axis_mask.append region[axis]..(region[axis]+region[dimension])
    end

    parser.after do
      if axis_mask.count.zero?
        nil
      else
        yield axis_mask, {
          :page => page,
          :page_width => page_width,
          :page_height => page_height
        }
      end
    end
  end
end

.include_in(pdf) ⇒ Object 



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# File 'lib/analysis/margins.rb', line 45

def self.include_in pdf
  axis_spatials pdf, :top_margins, :y do |y_mask, obj|
    obj.merge({
      :x => 0,
      :y => y_mask.max,
      :width => obj[:page_width],
      :height => obj[:page_height] - y_mask.max
    })
  end

  axis_spatials pdf, :bottom_margins, :y do |y_mask, obj|
    obj.merge({
      :x => 0,
      :y => 0,
      :width => obj[:page_width],
      :height => y_mask.min
    })
  end

  axis_spatials pdf, :left_margins, :x do |x_mask, obj|
    obj.merge({
      :x => 0,
      :y => 0,
      :width => x_mask.min,
      :height => obj[:page_height]
    })
  end

  axis_spatials pdf, :right_margins, :x do |x_mask, obj|
    obj.merge({
      :x => x_mask.max,
      :y => 0,
      :width => obj[:page_width] - x_mask.max,
      :height => obj[:page_height]
    })
  end
end