45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
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import pypdf
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def main(source, out, section_length):
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assert section_length % 4 == 0
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in_reader = pypdf.PdfReader(source)
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out_writer = pypdf.PdfWriter()
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to_add = section_length - len(in_reader.pages) % section_length
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add_before = to_add // 2
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add_after = to_add - add_before
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pages = [pypdf.PageObject.create_blank_page(in_reader) for _ in range(add_before)]
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pages += in_reader.pages
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pages += [pypdf.PageObject.create_blank_page(in_reader) for _ in range(add_after)]
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for sig_start in range(0, len(in_reader.pages), section_length):
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for side in range(section_length // 4):
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top = [
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sig_start + section_length - side - 1,
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sig_start + side,
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]
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bottom = [
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sig_start + section_length // 2 + side,
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sig_start + section_length // 2 + side - 1,
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]
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if side % 2 != 0:
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top = list(reversed(top))
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bottom = list(reversed(bottom))
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print(top)
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print(bottom)
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continue
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for si, pi in enumerate(range(sig_start, sig_start + section_length)):
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page_box = pages[pi]
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trans = pypdf.Transformation()
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if si >= section_length // 4 and si < 3 * section_length // 4:
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trans = trans.rotate(180)
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trans = trans.scale(0.5, 0.5)
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