5 from reportlab.lib.pagesizes import A4
6 a4_width, a4_height = A4
8 parser = argparse.ArgumentParser(description="build print-ready book PDF")
9 parser.add_argument("-i", "--input", dest="input_file", action="append", required=True, help="input PDF file")
10 parser.add_argument("-o", "--output", dest="output_file", required=True, help="output PDF file")
11 parser.add_argument("-p", "--pages", dest="page_range", action="append", help="page range, e.g., '3-end'")
12 parser.add_argument("-c", "--crop", dest="crop_range", help="crops left, bottom, right, top – e.g., '10,10,10,10'")
13 parser.add_argument("-n", "--nup4", dest="nup4", action='store_true', help="puts 4 input pages onto 1 output page")
14 parser.add_argument("-a", "--analyze", dest="analyze", action="store_true", help="print lines identifying spine, page borders")
15 parser.add_argument("-t", "--symmetry", dest="symmetry", action="store_true", help="alternate horizontal crops between odd and even pages")
16 parser.add_argument("-r", "--rotate", dest="rotate", help="rotate page of number by 90°")
17 parser.add_argument("-m", "--margin", type=float, default=4.3, help="print margin (default 4.3)")
18 args = parser.parse_args()
21 # select pages from input files
24 for i, input_file in enumerate(args.input_file):
25 file = open(input_file, 'rb')
26 opened_files += [file]
27 reader = pypdf.PdfReader(file)
29 end_page = len(reader.pages)
30 if args.page_range and len(args.page_range) > i:
31 start, end = args.page_range[i].split('-')
32 if not (len(start) == 0 or start == "start"):
33 start_page = int(start) - 1
34 if not (len(end) == 0 or end == "end"):
36 for page_num in range(start_page, end_page):
37 page = reader.pages[page_num]
38 pages_to_add += [page]
39 print("read in %s page number %d" % (input_file, page_num+1))
43 page = pages_to_add[int(args.rotate) - 1]
44 page.add_transformation(pypdf.Transformation().translate(tx=-a4_width/2, ty=-a4_height/2))
45 page.add_transformation(pypdf.Transformation().rotate(-90))
46 page.add_transformation(pypdf.Transformation().translate(tx=a4_width/2, ty=a4_height/2))
48 # normalize all pages to portrait A4
49 for page in pages_to_add:
51 page.rotate(360 - page["/Rotate"])
52 page.mediabox.left = 0
53 page.mediabox.bottom = 0
54 page.mediabox.top = a4_height
55 page.mediabox.right = a4_width
56 page.cropbox = page.mediabox
59 crop_left, crop_bottom, crop_right, crop_top = 0, 0, 0, 0
61 crop_left, crop_bottom, crop_right, crop_top = [float(x) for x in args.crop_range.split(',')]
62 cropped_width = a4_width - crop_left - crop_right
63 cropped_height = a4_height - crop_bottom - crop_top
66 zoom_horizontal = a4_width / (a4_width - crop_left - crop_right)
67 zoom_vertical = a4_height / (a4_height - crop_bottom - crop_top)
68 if (zoom_horizontal > 1 and zoom_vertical < 1) or (zoom_horizontal < 1 and zoom_vertical > 1):
69 print("Error: opposing zooms.")
71 elif zoom_horizontal + zoom_vertical > 2:
72 zoom = min(zoom_horizontal, zoom_vertical)
74 zoom = max(zoom_horizontal, zoom_vertical)
76 writer = pypdf.PdfWriter()
79 for page in pages_to_add:
80 if args.symmetry and odd_page:
81 page.add_transformation(pypdf.Transformation().translate(tx=-crop_right, ty=-crop_bottom))
83 page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
84 page.add_transformation(pypdf.Transformation().scale(zoom, zoom))
85 page.mediabox.right = cropped_width * zoom
86 page.mediabox.top = cropped_height * zoom
88 odd_page = not odd_page
91 points_per_mm = 2.83465
92 printable_margin = args.margin * points_per_mm
93 printable_scale = (a4_width - 2*printable_margin)/a4_width
94 spine_limit = 10 * points_per_mm
95 half_width = a4_width / n_pages_per_axis
96 half_height = a4_height / n_pages_per_axis
97 section_scale_factor = 1 / n_pages_per_axis
98 spine_part_of_page = (spine_limit / half_width) / printable_scale
99 bonus_shrink_factor = 1 - spine_part_of_page
102 mod_to_8 = len(pages_to_add) % 8
104 for _ in range(8 - mod_to_8):
105 new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
106 pages_to_add += [new_page]
108 for page in pages_to_add:
115 new_page_order += [eight_pack[3]] # page front, upper left
116 new_page_order += [eight_pack[0]] # page front, upper right
117 new_page_order += [eight_pack[7]] # page front, lower left
118 new_page_order += [eight_pack[4]] # page front, lower right
119 new_page_order += [eight_pack[1]] # page back, upper left
120 new_page_order += [eight_pack[2]] # page back, upper right
121 new_page_order += [eight_pack[5]] # page back, lower left
122 new_page_order += [eight_pack[6]] # page back, lower right
126 for page in new_page_order:
128 new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
130 # in-section transformations: align pages on top, left-hand pages to left, right-hand to right
131 page.add_transformation(pypdf.Transformation().translate(ty=(a4_height / zoom - (a4_height - crop_top))))
134 page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
136 page.add_transformation(pypdf.Transformation().translate(tx=-crop_right))
137 elif i == 1 or i == 3:
139 page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_left))))
141 page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_right))))
142 page.add_transformation(pypdf.Transformation().scale(zoom * bonus_shrink_factor, zoom * bonus_shrink_factor))
144 page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin/printable_scale))
146 # outer section transformations
147 page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*a4_height))
149 y_section = a4_height
150 page.mediabox.bottom = half_height
151 page.mediabox.top = a4_height
154 page.mediabox.bottom = 0
155 page.mediabox.top = half_height
158 page.mediabox.left = 0
159 page.mediabox.right = half_width
161 page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*a4_width))
163 page.mediabox.left = half_width
164 page.mediabox.right = a4_width
165 page.add_transformation(pypdf.Transformation().translate(tx=x_section, ty=y_section))
166 page.add_transformation(pypdf.Transformation().scale(section_scale_factor, section_scale_factor))
167 new_page.merge_page(page)
169 print("merged page number", page_count)
172 from reportlab.pdfgen import canvas
175 packet = io.BytesIO()
176 c = canvas.Canvas(packet, pagesize=A4)
178 c.line(0, a4_height, a4_width, a4_height)
179 c.line(0, half_height, a4_width, half_height)
180 c.line(0, 0, a4_width, 0)
181 c.line(0, a4_height, 0, 0)
182 c.line(half_width, a4_height, half_width, 0)
183 c.line(a4_width, a4_height, a4_width, 0)
185 new_pdf = pypdf.PdfReader(packet)
186 new_page.merge_page(new_pdf.pages[0])
187 printable_offset_x = printable_margin
188 printable_offset_y = printable_margin * a4_height / a4_width
189 new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
190 new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
191 x_left_spine_limit = half_width * bonus_shrink_factor
192 x_right_spine_limit = a4_width - x_left_spine_limit
193 if args.analyze or front_page:
194 packet = io.BytesIO()
195 c = canvas.Canvas(packet, pagesize=A4)
199 c.line(x_left_spine_limit, a4_height, x_left_spine_limit, 0)
200 c.line(x_right_spine_limit, a4_height, x_right_spine_limit, 0)
203 cut_depth = 19.5 * points_per_mm
204 cut_width = 10.5 * points_per_mm
205 middle_point_depth = 4 * points_per_mm
207 start_up_left_left_x = x_left_spine_limit - 0.5 * cut_width
208 start_up_left_right_x = x_left_spine_limit + 0.5 * cut_width
209 middle_point_up_left_y = half_height + middle_point_depth
210 end_point_up_left_y = half_height + cut_depth
211 c.line(start_up_left_right_x, half_height, x_left_spine_limit, end_point_up_left_y)
212 c.line(x_left_spine_limit, end_point_up_left_y, x_left_spine_limit, middle_point_up_left_y)
213 c.line(x_left_spine_limit, middle_point_up_left_y, start_up_left_left_x, half_height)
215 start_down_right_left_x = x_right_spine_limit - 0.5 * cut_width
216 start_down_right_right_x = x_right_spine_limit + 0.5 * cut_width
217 middle_point_down_right_y = half_height - middle_point_depth
218 end_point_down_right_y = half_height - cut_depth
219 c.line(start_down_right_left_x, half_height, x_right_spine_limit, end_point_down_right_y)
220 c.line(x_right_spine_limit, end_point_down_right_y, x_right_spine_limit, middle_point_down_right_y)
221 c.line(x_right_spine_limit, middle_point_down_right_y, start_down_right_right_x, half_height)
223 if args.analyze or front_page:
225 new_pdf = pypdf.PdfReader(packet)
226 new_page.merge_page(new_pdf.pages[0])
227 writer.add_page(new_page)
229 front_page = not front_page
230 for file in opened_files:
233 with open(args.output_file, 'wb') as output_file:
234 writer.write(output_file)