import io
from reportlab.lib.pagesizes import A4
a4_width, a4_height = A4
+points_per_cm = 10 * 72 / 25.4
+cut_depth = 1.95 * points_per_cm
+cut_width = 1.05 * points_per_cm
+middle_point_depth = 0.4 * points_per_cm
+spine_limit = 1 * points_per_cm
parser = argparse.ArgumentParser(description="build print-ready book PDF")
-parser.add_argument("-i", "--input", dest="input_file", action="append", required=True, help="input PDF file")
-parser.add_argument("-o", "--output", dest="output_file", required=True, help="output PDF file")
-parser.add_argument("-p", "--pages", dest="page_range", action="append", help="page range, e.g., '3-end'")
-parser.add_argument("-c", "--crop", dest="crop_range", help="crops left, bottom, right, top – e.g., '10,10,10,10'")
-parser.add_argument("-n", "--nup4", dest="nup4", action='store_true', help="puts 4 input pages onto 1 output page")
-parser.add_argument("-a", "--analyze", dest="analyze", action="store_true", help="print lines identifying spine, page borders")
-parser.add_argument("-t", "--symmetry", dest="symmetry", action="store_true", help="alternate horizontal crops between odd and even pages")
+parser.add_argument("-i", "--input_file", action="append", required=True, help="input PDF file")
+parser.add_argument("-o", "--output_file", required=True, help="output PDF file")
+parser.add_argument("-p", "--page_range", action="append", help="page range, e.g., '3-end'")
+parser.add_argument("-c", "--crop_range", action="append", help="cm crops left, bottom, right, top – e.g., '10,10,10,10'; prefix with ':'-delimited page range to limit effect")
+parser.add_argument("-s", "--symmetry", action="store_true", help="alternate horizontal crops between odd and even pages")
parser.add_argument("-r", "--rotate", dest="rotate", type=int, action="append", help="rotate page of number by 90° (usable multiple times on same page!)")
-parser.add_argument("-m", "--margin", type=float, default=4.3, help="print margin (default 4.3)")
+parser.add_argument("-n", "--nup4", action='store_true', help="puts 4 input pages onto 1 output page")
+parser.add_argument("-a", "--analyze", action="store_true", help="in --nup4, print lines identifying spine, page borders")
+parser.add_argument("-m", "--margin", type=float, default=0.43, help="print margin for --nup4 in cm (default 0.43)")
args = parser.parse_args()
# select pages from input files
+def parse_page_range(range_string, pages):
+ start_page = 0
+ end_page = len(pages)
+ if range_string:
+ start, end = range_string.split('-')
+ if not (len(start) == 0 or start == "start"):
+ start_page = int(start) - 1
+ if not (len(end) == 0 or end == "end"):
+ end_page = int(end)
+ return start_page, end_page
pages_to_add = []
opened_files = []
+new_page_num = 0
for i, input_file in enumerate(args.input_file):
file = open(input_file, 'rb')
opened_files += [file]
reader = pypdf.PdfReader(file)
- start_page = 0
- end_page = len(reader.pages)
+ range_string = None
if args.page_range and len(args.page_range) > i:
- start, end = args.page_range[i].split('-')
- if not (len(start) == 0 or start == "start"):
- start_page = int(start) - 1
- if not (len(end) == 0 or end == "end"):
- end_page = int(end)
- for page_num in range(start_page, end_page):
- page = reader.pages[page_num]
+ range_string = args.page_range[i]
+ start_page, end_page = parse_page_range(range_string, reader.pages)
+ for old_page_num in range(start_page, end_page):
+ new_page_num += 1
+ page = reader.pages[old_page_num]
pages_to_add += [page]
- print("read in %s page number %d" % (input_file, page_num+1))
+ print("-i, -p: read in %s page number %d as new page %d" % (input_file, old_page_num+1, new_page_num))
+
+# if necessary, pad pages to multiple of 8
+if args.nup4:
+ mod_to_8 = len(pages_to_add) % 8
+ if mod_to_8 > 0:
+ print("-n: number of input pages %d not multiple of 8, padding to that" % len(pages_to_add))
+ 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]
# rotate page canvas
if args.rotate:
page.add_transformation(pypdf.Transformation().translate(tx=-a4_width/2, ty=-a4_height/2))
page.add_transformation(pypdf.Transformation().rotate(-90))
page.add_transformation(pypdf.Transformation().translate(tx=a4_width/2, ty=a4_height/2))
+ print("-r: rotating (by 90°) page", rotate)
# normalize all pages to portrait A4
for page in pages_to_add:
page.mediabox.right = a4_width
page.cropbox = page.mediabox
-# determine page crop
-crop_left, crop_bottom, crop_right, crop_top = 0, 0, 0, 0
-if args.crop_range:
- crop_left, crop_bottom, crop_right, crop_top = [float(x) for x in args.crop_range.split(',')]
-cropped_width = a4_width - crop_left - crop_right
-cropped_height = a4_height - crop_bottom - crop_top
-zoom = 1
+# 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:
- 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 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 page in pages_to_add:
- if args.symmetry and odd_page:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_right, ty=-crop_bottom))
- else:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
+ 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
- points_per_mm = 2.83465
- printable_margin = args.margin * points_per_mm
+ printable_margin = args.margin * points_per_cm
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 = []
+ new_i_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
+ n_eights = 0
for page in pages_to_add:
if i == 0:
eight_pack = []
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
i = 0
page_count = 0
front_page = True
- for page in new_page_order:
+ 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:
- if args.symmetry:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
- else:
- page.add_transformation(pypdf.Transformation().translate(tx=-crop_right))
+ page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
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().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))
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)
+ print("merged page number %d (of %d)" % (page_count, len(pages_to_add)))
i += 1
if i > 3:
from reportlab.pdfgen import canvas
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
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)
projects / misc / blobdiff