Initial commit — Copydev Imposing Tool

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>

app/engine/page_numbers.py

@@ -0,0 +1,89 @@
+"""Moteur Numerotation de pages."""
+
+from pypdf import PdfReader, PdfWriter
+from reportlab.pdfgen import canvas
+from reportlab.lib.units import mm
+from .pdf_utils import get_page_size
+import io
+
+
+POSITIONS = {
+    "haut-gauche": ("left", "top"),
+    "haut-centre": ("center", "top"),
+    "haut-droite": ("right", "top"),
+    "milieu-gauche": ("left", "middle"),
+    "milieu-centre": ("center", "middle"),
+    "milieu-droite": ("right", "middle"),
+    "bas-gauche": ("left", "bottom"),
+    "bas-centre": ("center", "bottom"),
+    "bas-droite": ("right", "bottom"),
+}
+
+
+def add_page_numbers(input_path, output_path, position="bas-centre",
+                     font_name="Helvetica", font_size=10, color=(0, 0, 0),
+                     prefix="", suffix="", start_number=1,
+                     margin_x=10*mm, margin_y=10*mm,
+                     apply_to="all"):
+    """Ajouter des numeros de page.
+
+    position: cle de POSITIONS
+    apply_to: "all", "even", "odd"
+    """
+    reader = PdfReader(input_path)
+    writer = PdfWriter()
+
+    h_align, v_align = POSITIONS.get(position, ("center", "bottom"))
+    total_pages = len(reader.pages)
+
+    for i, page in enumerate(reader.pages):
+        page_num = start_number + i
+
+        # Filtre pair/impair
+        if apply_to == "even" and page_num % 2 != 0:
+            writer.add_page(page)
+            continue
+        if apply_to == "odd" and page_num % 2 == 0:
+            writer.add_page(page)
+            continue
+
+        w, h = get_page_size(page)
+
+        # Generer le texte
+        text = f"{prefix}{page_num}{suffix}"
+
+        # Creer overlay avec le numero
+        packet = io.BytesIO()
+        c = canvas.Canvas(packet, pagesize=(w, h))
+        c.setFont(font_name, font_size)
+        c.setFillColorRGB(*color)
+
+        # Calculer la position
+        text_width = c.stringWidth(text, font_name, font_size)
+
+        if h_align == "left":
+            x = margin_x
+        elif h_align == "right":
+            x = w - margin_x - text_width
+        else:
+            x = (w - text_width) / 2
+
+        if v_align == "top":
+            y = h - margin_y - font_size
+        elif v_align == "middle":
+            y = (h - font_size) / 2
+        else:
+            y = margin_y
+
+        c.drawString(x, y, text)
+        c.showPage()
+        c.save()
+
+        packet.seek(0)
+        overlay_reader = PdfReader(packet)
+        page.merge_page(overlay_reader.pages[0])
+        writer.add_page(page)
+
+    with open(output_path, "wb") as f:
+        writer.write(f)
+    return output_path