David Böhm
616bd0cbe7
Analyzer should be moved to ActiveStorage::Analyzer First there are many bugs with ActiveStorage that needs to be fixed: Files are not deleted if job is destroyed (dependent: :purge is set) If a new file is uploaded the old file is not deleted (has_one_attechment)
81 lines
1.8 KiB
Ruby
81 lines
1.8 KiB
Ruby
module Services
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# Class to analyze PDF to extract number of pages from a0 to a3 and costum qm
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class PdfAnalyzer
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require 'pdf/reader'
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require 'bigdecimal'
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attr_reader :costum_qm, :pages_a0, :pages_a1, :pages_a2, :pages_a3
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def initialize(file)
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@reader = PDF::Reader.new(file)
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@pages_a0 = 0
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@pages_a1 = 0
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@pages_a2 = 0
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@pages_a3 = 0
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@costum_qm = 0
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@page_width = 0
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@page_height = 0
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end
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def analyze
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@reader.pages.each do |page|
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format = extract_format(page)
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case format
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when 'a0'
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@pages_a0 += 1
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when 'a1'
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@pages_a1 += 1
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when 'a2'
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@pages_a2 += 1
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when 'a3'
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@pages_a3 += 1
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else
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@costum_qm += calculate_qm
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end
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end
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end
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private
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def calculate_qm
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(@page_width / 1000) * (@page_height / 1000)
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end
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def extract_format(page)
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# debugger
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extract_size(page)
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return 'a0' if @page_width.round == 841 && @page_height.round == 1189
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return 'a1' if @page_width.round == 594 && @page_height.round == 841
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return 'a2' if @page_width.round == 420 && @page_height.round == 594
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return 'a3' if @page_width.round == 297 && @page_height.round == 420
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'costum'
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end
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def extract_size(page)
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# debugger
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bbox = page.attributes[:MediaBox] # CropBox
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width = bbox[2] - bbox[0]
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height = bbox[3] - bbox[1]
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width_in_mm = pt2mm(width)
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height_in_mm = pt2mm(height)
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width_in_mm, height_in_mm = height_in_mm, width_in_mm if width_in_mm > height_in_mm
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@page_width = width_in_mm
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@page_height = height_in_mm
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nil
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end
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def pt2mm(pt)
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(pt2in(pt) * BigDecimal('25.4')).round(2)
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end
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def pt2in(pt)
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(pt / BigDecimal('72')).round(2)
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end
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end
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end
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