- writer = pypdf.PdfWriter()
- if not args.nup4:
- odd_page = True
- for page in pages_to_add:
- if args.symmetry and odd_page:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
- else:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_right, 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 = 4.3 * 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)
+# determine page crops, zooms, crop symmetry
+crops_at_page = [(0,0,0,0)]*len(pages_to_add)
+zoom_at_page = [1]*len(pages_to_add)
+if args.crop_range:
+ for crop_range in args.crop_range:
+ initial_split = crop_range.split(':')
+ if len(initial_split) > 1:
+ page_range = initial_split[0]
+ crops = initial_split[1]
+ else:
+ page_range = None
+ crops = initial_split[0]
+ start_page, end_page = parse_page_range(page_range, pages_to_add)
+ crop_left_cm, crop_bottom_cm, crop_right_cm, crop_top_cm = [float(x) for x in crops.split(',')]
+ crop_left = crop_left_cm * points_per_cm
+ crop_bottom = crop_bottom_cm * points_per_cm
+ crop_right = crop_right_cm * points_per_cm
+ crop_top = crop_top_cm * points_per_cm
+ if args.symmetry:
+ print("-c, -t: to pages %d to %d applying crops: left %.2fcm, bottom %.2fcm, right %.2fcm, top %.2fcm (but alternating left and right crop between even and odd pages)" % (start_page + 1, end_page, crop_left_cm, crop_bottom_cm, crop_right_cm, crop_top_cm))
+ else:
+ print("-c: to pages %d to %d applying crops: left %.2fcm, bottom %.2fcm, right %.2fcm, top %.2fcm" % (start_page + 1, end_page, crop_left_cm, crop_bottom_cm, crop_right_cm, crop_top_cm))
+ cropped_width = a4_width - crop_left - crop_right
+ cropped_height = a4_height - crop_bottom - crop_top
+ zoom = 1
+ zoom_horizontal = a4_width / (a4_width - crop_left - crop_right)
+ zoom_vertical = a4_height / (a4_height - crop_bottom - crop_top)
+ if (zoom_horizontal > 1 and zoom_vertical < 1) or (zoom_horizontal < 1 and zoom_vertical > 1):
+ print("Error: opposing zooms.")
+ exit(1)
+ elif zoom_horizontal + zoom_vertical > 2:
+ zoom = min(zoom_horizontal, zoom_vertical)
+ else:
+ zoom = max(zoom_horizontal, zoom_vertical)
+ for page_num in range(start_page, end_page):
+ if args.symmetry and page_num % 2:
+ crops_at_page[page_num] = (crop_right, crop_bottom, crop_left, crop_top)
+ else:
+ 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.margin)
+ if args.analyze:
+ print("-a: drawing page borders, spine limits")
+ n_pages_per_axis = 2
+ printable_margin = args.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)