- page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
- page.add_transformation(pypdf.Transformation().scale(zoom, zoom))
- page.mediabox.right = cropped_width * zoom
- page.mediabox.top = cropped_height * zoom
- writer.add_page(page)
- odd_page = not odd_page
- else:
- n_pages_per_axis = 2
- points_per_mm = 2.83465
- printable_margin = args.margin * points_per_mm
- printable_scale = (a4_width - 2*printable_margin)/a4_width
- spine_limit = 10 * points_per_mm
- half_width = a4_width / n_pages_per_axis
- half_height = a4_height / n_pages_per_axis
- section_scale_factor = 1 / n_pages_per_axis
- spine_part_of_page = (spine_limit / half_width) / printable_scale
- bonus_shrink_factor = 1 - spine_part_of_page
- new_page_order = []
- eight_pack = []
- mod_to_8 = len(pages_to_add) % 8
- if mod_to_8 > 0:
- for _ in range(8 - mod_to_8):
- new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
- pages_to_add += [new_page]
- i = 0
- for page in pages_to_add:
- if i == 0:
- eight_pack = []
- eight_pack += [page]
- i += 1
- if i == 8:
- i = 0
- new_page_order += [eight_pack[3]] # page front, upper left
- new_page_order += [eight_pack[0]] # page front, upper right
- new_page_order += [eight_pack[7]] # page front, lower left
- new_page_order += [eight_pack[4]] # page front, lower right
- new_page_order += [eight_pack[1]] # page back, upper left
- new_page_order += [eight_pack[2]] # page back, upper right
- new_page_order += [eight_pack[5]] # page back, lower left
- new_page_order += [eight_pack[6]] # page back, lower right
- i = 0
- page_count = 0
- front_page = True
- for page in new_page_order:
- if i == 0:
- new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
-
- # in-section transformations: align pages on top, left-hand pages to left, right-hand to right
- page.add_transformation(pypdf.Transformation().translate(ty=(a4_height / zoom - (a4_height - crop_top))))
- if i == 0 or i == 2:
- if args.symmetry:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
- else:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_right))
- elif i == 1 or i == 3:
- if args.symmetry:
- page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_left))))
- else:
- page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_right))))
- page.add_transformation(pypdf.Transformation().scale(zoom * bonus_shrink_factor, zoom * bonus_shrink_factor))
- if i == 2 or i == 3:
- page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin/printable_scale))
-
- # outer section transformations
- page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*a4_height))
- if i == 0 or i == 1:
- y_section = a4_height
- page.mediabox.bottom = half_height
- page.mediabox.top = a4_height
- if i == 2 or i == 3:
- y_section = 0
- page.mediabox.bottom = 0
- page.mediabox.top = half_height
- if i == 0 or i == 2:
- x_section = 0
- page.mediabox.left = 0
- page.mediabox.right = half_width
- if i == 1 or i == 3:
- page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*a4_width))
- x_section = a4_width
- page.mediabox.left = half_width
- page.mediabox.right = a4_width
- page.add_transformation(pypdf.Transformation().translate(tx=x_section, ty=y_section))
- page.add_transformation(pypdf.Transformation().scale(section_scale_factor, section_scale_factor))
- new_page.merge_page(page)
- page_count += 1
- print("merged page number", page_count)
- i += 1
- if i > 3:
- from reportlab.pdfgen import canvas
- if args.analyze:
- # borders
- packet = io.BytesIO()
- c = canvas.Canvas(packet, pagesize=A4)
- c.setLineWidth(0.1)
- c.line(0, a4_height, a4_width, a4_height)
- c.line(0, half_height, a4_width, half_height)
- c.line(0, 0, a4_width, 0)
- c.line(0, a4_height, 0, 0)
- c.line(half_width, a4_height, half_width, 0)
- c.line(a4_width, a4_height, a4_width, 0)
- c.save()
- new_pdf = pypdf.PdfReader(packet)
- new_page.merge_page(new_pdf.pages[0])
- printable_offset_x = printable_margin
- printable_offset_y = printable_margin * a4_height / a4_width
- new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
- new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
- x_left_spine_limit = half_width * bonus_shrink_factor
- x_right_spine_limit = a4_width - x_left_spine_limit
- if args.analyze or front_page:
- packet = io.BytesIO()
- c = canvas.Canvas(packet, pagesize=A4)
- if args.analyze:
- # # spine lines
- c.setLineWidth(0.1)
- c.line(x_left_spine_limit, a4_height, x_left_spine_limit, 0)
- c.line(x_right_spine_limit, a4_height, x_right_spine_limit, 0)
- if front_page:
- c.setLineWidth(0.2)
- cut_depth = 19.5 * points_per_mm
- cut_width = 10.5 * points_per_mm
- middle_point_depth = 4 * points_per_mm
-
- start_up_left_left_x = x_left_spine_limit - 0.5 * cut_width
- start_up_left_right_x = x_left_spine_limit + 0.5 * cut_width
- middle_point_up_left_y = half_height + middle_point_depth
- end_point_up_left_y = half_height + cut_depth
- c.line(start_up_left_right_x, half_height, x_left_spine_limit, end_point_up_left_y)
- c.line(x_left_spine_limit, end_point_up_left_y, x_left_spine_limit, middle_point_up_left_y)
- c.line(x_left_spine_limit, middle_point_up_left_y, start_up_left_left_x, half_height)
-
- start_down_right_left_x = x_right_spine_limit - 0.5 * cut_width
- start_down_right_right_x = x_right_spine_limit + 0.5 * cut_width
- middle_point_down_right_y = half_height - middle_point_depth
- end_point_down_right_y = half_height - cut_depth
- c.line(start_down_right_left_x, half_height, x_right_spine_limit, end_point_down_right_y)
- c.line(x_right_spine_limit, end_point_down_right_y, x_right_spine_limit, middle_point_down_right_y)
- c.line(x_right_spine_limit, middle_point_down_right_y, start_down_right_right_x, half_height)
-
- if args.analyze or front_page:
- c.save()
- # packet.seek(0)
- new_pdf = pypdf.PdfReader(packet)
- new_page.merge_page(new_pdf.pages[0])
- writer.add_page(new_page)
- i = 0
- front_page = not front_page
-
- with open(args.output_file, 'wb') as output_file:
- writer.write(output_file)
- if args.second:
- file2.close()
+ crops_at_page[page_num] = (crop_left, crop_bottom, crop_right, crop_top)
+ zoom_at_page[page_num] = zoom
+
+writer = pypdf.PdfWriter()
+if not args.nup4:
+ # single-page output
+ print("building 1-input-page-per-output-page book")
+ odd_page = True
+ for i, page in enumerate(pages_to_add):
+ crop_left, crop_bottom, crop_right, crop_top = crops_at_page[i]
+ zoom = zoom_at_page[i]
+ page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
+ page.add_transformation(pypdf.Transformation().scale(zoom, zoom))
+ cropped_width = a4_width - crop_left - crop_right
+ cropped_height = a4_height - crop_bottom - crop_top
+ page.mediabox.right = cropped_width * zoom
+ page.mediabox.top = cropped_height * zoom
+ writer.add_page(page)
+ odd_page = not odd_page
+ print("built page number %d (of %d)" % (i+1, len(pages_to_add)))
+
+else:
+ print("-n: building 4-input-pages-per-output-page book")
+ print("-m: applying printable-area margin of %.2fcm" % args.print_margin)
+ if args.analyze:
+ print("-a: drawing page borders, spine limits")
+ n_pages_per_axis = 2
+ printable_margin = args.print_margin * points_per_cm
+ printable_scale = (a4_width - 2*printable_margin)/a4_width
+ half_width = a4_width / n_pages_per_axis
+ half_height = a4_height / n_pages_per_axis
+ section_scale_factor = 1 / n_pages_per_axis
+ spine_part_of_page = (spine_limit / half_width) / printable_scale
+ bonus_shrink_factor = 1 - spine_part_of_page
+ new_page_order = []
+ new_i_order = []
+ eight_pack = []
+ i = 0
+ n_eights = 0
+ for page in pages_to_add:
+ if i == 0:
+ eight_pack = []
+ eight_pack += [page]
+ i += 1
+ if i == 8:
+ i = 0
+ new_i_order += [8 * n_eights + 3,
+ 8 * n_eights + 0,
+ 8 * n_eights + 7,
+ 8 * n_eights + 4,
+ 8 * n_eights + 1,
+ 8 * n_eights + 2,
+ 8 * n_eights + 5,
+ 8 * n_eights + 6]
+ n_eights += 1
+ new_page_order += [eight_pack[3]] # page front, upper left
+ new_page_order += [eight_pack[0]] # page front, upper right
+ new_page_order += [eight_pack[7]] # page front, lower left
+ new_page_order += [eight_pack[4]] # page front, lower right
+ new_page_order += [eight_pack[1]] # page back, upper left
+ new_page_order += [eight_pack[2]] # page back, upper right
+ new_page_order += [eight_pack[5]] # page back, lower left
+ new_page_order += [eight_pack[6]] # page back, lower right
+ i = 0
+ page_count = 0
+ front_page = True
+ for j, page in enumerate(new_page_order):
+ if i == 0:
+ new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
+
+ # in-section transformations: align pages on top, left-hand pages to left, right-hand to right
+ new_i = new_i_order[j]
+ crop_left, crop_bottom, crop_right, crop_top = crops_at_page[new_i]
+ zoom = zoom_at_page[new_i]
+ page.add_transformation(pypdf.Transformation().translate(ty=(a4_height / zoom - (a4_height - crop_top))))
+ if i == 0 or i == 2:
+ page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
+ elif i == 1 or i == 3:
+ page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_right))))
+ page.add_transformation(pypdf.Transformation().scale(zoom * bonus_shrink_factor, zoom * bonus_shrink_factor))
+ if i == 2 or i == 3:
+ page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin/printable_scale))
+
+ # outer section transformations
+ page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*a4_height))
+ if i == 0 or i == 1:
+ y_section = a4_height
+ page.mediabox.bottom = half_height
+ page.mediabox.top = a4_height
+ if i == 2 or i == 3:
+ y_section = 0
+ page.mediabox.bottom = 0
+ page.mediabox.top = half_height
+ if i == 0 or i == 2:
+ x_section = 0
+ page.mediabox.left = 0
+ page.mediabox.right = half_width
+ if i == 1 or i == 3:
+ page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*a4_width))
+ x_section = a4_width
+ page.mediabox.left = half_width
+ page.mediabox.right = a4_width
+ page.add_transformation(pypdf.Transformation().translate(tx=x_section, ty=y_section))
+ page.add_transformation(pypdf.Transformation().scale(section_scale_factor, section_scale_factor))
+ new_page.merge_page(page)
+ page_count += 1
+ print("merged page number %d (of %d)" % (page_count, len(pages_to_add)))
+ i += 1
+ if i > 3:
+ from reportlab.pdfgen import canvas
+ if args.analyze:
+ # borders
+ packet = io.BytesIO()
+ c = canvas.Canvas(packet, pagesize=A4)
+ c.setLineWidth(0.1)
+ c.line(0, a4_height, a4_width, a4_height)
+ c.line(0, half_height, a4_width, half_height)
+ c.line(0, 0, a4_width, 0)
+ c.line(0, a4_height, 0, 0)
+ c.line(half_width, a4_height, half_width, 0)
+ c.line(a4_width, a4_height, a4_width, 0)
+ c.save()
+ new_pdf = pypdf.PdfReader(packet)
+ new_page.merge_page(new_pdf.pages[0])
+ printable_offset_x = printable_margin
+ printable_offset_y = printable_margin * a4_height / a4_width
+ new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
+ new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
+ x_left_spine_limit = half_width * bonus_shrink_factor
+ x_right_spine_limit = a4_width - x_left_spine_limit
+ if args.analyze or front_page:
+ packet = io.BytesIO()
+ c = canvas.Canvas(packet, pagesize=A4)
+ if args.analyze:
+ # # spine lines
+ c.setLineWidth(0.1)
+ c.line(x_left_spine_limit, a4_height, x_left_spine_limit, 0)
+ c.line(x_right_spine_limit, a4_height, x_right_spine_limit, 0)
+ if front_page:
+ c.setLineWidth(0.2)
+
+ start_up_left_left_x = x_left_spine_limit - 0.5 * cut_width
+ start_up_left_right_x = x_left_spine_limit + 0.5 * cut_width
+ middle_point_up_left_y = half_height + middle_point_depth
+ end_point_up_left_y = half_height + cut_depth
+ c.line(start_up_left_right_x, half_height, x_left_spine_limit, end_point_up_left_y)
+ c.line(x_left_spine_limit, end_point_up_left_y, x_left_spine_limit, middle_point_up_left_y)
+ c.line(x_left_spine_limit, middle_point_up_left_y, start_up_left_left_x, half_height)
+
+ start_down_right_left_x = x_right_spine_limit - 0.5 * cut_width
+ start_down_right_right_x = x_right_spine_limit + 0.5 * cut_width
+ middle_point_down_right_y = half_height - middle_point_depth
+ end_point_down_right_y = half_height - cut_depth
+ c.line(start_down_right_left_x, half_height, x_right_spine_limit, end_point_down_right_y)
+ c.line(x_right_spine_limit, end_point_down_right_y, x_right_spine_limit, middle_point_down_right_y)
+ c.line(x_right_spine_limit, middle_point_down_right_y, start_down_right_right_x, half_height)
+
+ if args.analyze or front_page:
+ c.save()
+ new_pdf = pypdf.PdfReader(packet)
+ new_page.merge_page(new_pdf.pages[0])
+ writer.add_page(new_page)
+ i = 0
+ front_page = not front_page
+
+# write and close
+for file in opened_files:
+ file.close()
+with open(args.output_file, 'wb') as output_file:
+ writer.write(output_file)