77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
"""
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Rozlozi naskenovanou brozuru do PDF se strankami razenymi od 1.
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Predpoklady:
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- Kazda PDF stranka obsahuje dve stranky brozury vedle sebe (leva + prava).
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- Sken probíhal duplexne od stredoveho listu smerem ven.
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- Stredove stranky se odvodi automaticky z poctu PDF stranek.
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Pouziti:
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python rozloz_brozuru.py <vstup.pdf> [vystup.pdf]
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"""
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import sys
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import copy
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from pypdf import PdfReader, PdfWriter
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from pypdf.generic import RectangleObject
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def rozloz(input_path, output_path):
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reader = PdfReader(input_path)
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n_pdf = len(reader.pages)
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center_left = n_pdf # napr. 12 nebo 40
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center_right = n_pdf + 1 # napr. 13 nebo 41
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total_pages = n_pdf * 2 # celkovy pocet stran brozury
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print(f"PDF stranek : {n_pdf}")
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print(f"Stran brozury: {total_pages} (stred: {center_left}+{center_right})")
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# Mapovani: brozurova strana -> (pdf_idx 0-based, 'L'/'P')
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page_map = {}
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n_sheets = n_pdf // 2
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for k in range(n_sheets):
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front_pdf = 2 * k
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back_pdf = 2 * k + 1
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page_map[center_left - 2 * k] = (front_pdf, 'L')
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page_map[center_right + 2 * k] = (front_pdf, 'P')
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page_map[center_right + 2 * k + 1] = (back_pdf, 'L')
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page_map[center_left - 2 * k - 1] = (back_pdf, 'P')
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writer = PdfWriter()
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for bp in range(1, total_pages + 1):
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pdf_idx, lr = page_map[bp]
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src = reader.pages[pdf_idx]
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width = float(src.mediabox.width)
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height = float(src.mediabox.height)
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half_w = width / 2
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new_page = copy.copy(src)
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if lr == 'L':
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box = RectangleObject([0, 0, half_w, height])
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else:
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box = RectangleObject([half_w, 0, width, height])
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new_page.mediabox = box
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new_page.cropbox = box
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writer.add_page(new_page)
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with open(output_path, "wb") as f:
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writer.write(f)
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print(f"Hotovo: {output_path} ({total_pages} stranek)")
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print("Pouziti: python rozloz_brozuru.py <vstup.pdf> [vystup.pdf]")
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sys.exit(1)
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inp = sys.argv[1]
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out = sys.argv[2] if len(sys.argv) > 2 else inp.replace(".pdf", "_serazena.pdf")
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rozloz(inp, out)
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