e3dfd90933
Outil d'imposition PDF desktop (PyQt6) remplacant Quite Imposing Plus. 9 fonctions : livret, n-up, step & repeat, imposition manuelle, jointure pages, pages blanches, numerotation, masquage, fonds perdus. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
103 lines
3.3 KiB
Python
103 lines
3.3 KiB
Python
"""Moteur N-Up : placer plusieurs pages par feuille."""
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from pypdf import PdfReader, PdfWriter, PageObject, Transformation
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from .pdf_utils import get_page_size, create_blank_page, mm_to_pt, smart_crop_marks
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import io
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def nup_pages(input_path, output_path, cols=2, rows=2, sheet_size=(841.89, 595.28),
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margin_top=0, margin_bottom=0, margin_left=0, margin_right=0,
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gutter_h=0, gutter_v=0, scale_mode="fit", crop_marks=False,
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background_path=None):
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"""Placer plusieurs pages sur chaque feuille.
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cols, rows: grille
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sheet_size: (largeur, hauteur) en points
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margins: en points
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gutter_h, gutter_v: espacement horizontal/vertical entre pages
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scale_mode: "fit" (ajuster) ou "none" (taille reelle)
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crop_marks: ajouter des reperes de coupe
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background_path: chemin vers un PDF de fond
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"""
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reader = PdfReader(input_path)
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pages = reader.pages
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sheet_w, sheet_h = sheet_size
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# Zone utile
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usable_w = sheet_w - margin_left - margin_right - gutter_h * (cols - 1)
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usable_h = sheet_h - margin_top - margin_bottom - gutter_v * (rows - 1)
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cell_w = usable_w / cols
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cell_h = usable_h / rows
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# Fond
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bg_page = None
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if background_path:
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bg_reader = PdfReader(background_path)
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if bg_reader.pages:
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bg_page = bg_reader.pages[0]
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writer = PdfWriter()
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pages_per_sheet = cols * rows
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for sheet_idx in range(0, len(pages), pages_per_sheet):
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sheet = PageObject.create_blank_page(width=sheet_w, height=sheet_h)
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if bg_page:
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sheet.merge_page(bg_page)
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grid_positions = []
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for slot in range(pages_per_sheet):
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page_idx = sheet_idx + slot
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if page_idx >= len(pages):
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break
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page = pages[page_idx]
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page_w, page_h = get_page_size(page)
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col = slot % cols
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row = slot // cols
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grid_positions.append((col, row))
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# Position de la cellule
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x = margin_left + col * (cell_w + gutter_h)
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y = sheet_h - margin_top - (row + 1) * cell_h - row * gutter_v
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# Calcul du scale
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if scale_mode == "fit":
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scale_x = cell_w / page_w
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scale_y = cell_h / page_h
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scale = min(scale_x, scale_y)
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else:
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scale = 1.0
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# Centrage dans la cellule
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scaled_w = page_w * scale
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scaled_h = page_h * scale
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offset_x = x + (cell_w - scaled_w) / 2
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offset_y = y + (cell_h - scaled_h) / 2
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# Placer la page
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overlay = PageObject.create_blank_page(width=sheet_w, height=sheet_h)
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overlay.merge_page(page)
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overlay.add_transformation(
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Transformation().scale(scale, scale).translate(offset_x, offset_y)
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)
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sheet.merge_page(overlay)
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# Reperes de coupe
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if crop_marks and grid_positions:
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marks = smart_crop_marks(
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sheet_w, sheet_h, grid_positions,
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cell_w + gutter_h, cell_h + gutter_v,
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margin_left, margin_top
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)
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sheet.merge_page(marks)
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writer.add_page(sheet)
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with open(output_path, "wb") as f:
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writer.write(f)
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return output_path
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