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/manual_impose.py

@@ -0,0 +1,68 @@
+"""Moteur Imposition manuelle."""
+
+from pypdf import PdfReader, PdfWriter, PageObject, Transformation
+from .pdf_utils import get_page_size, create_crop_marks_page
+
+
+def manual_impose(input_path, output_path, sheet_size, placements, crop_marks=False):
+    """Imposition manuelle : placer des pages a des positions precises.
+
+    sheet_size: (largeur, hauteur) en points
+    placements: liste de dicts:
+        {"page": int (1-based), "x": float, "y": float, "scale": float, "rotation": int}
+    """
+    reader = PdfReader(input_path)
+    pages = reader.pages
+    sheet_w, sheet_h = sheet_size
+
+    writer = PdfWriter()
+    sheet = PageObject.create_blank_page(width=sheet_w, height=sheet_h)
+
+    mark_positions = []
+
+    for p in placements:
+        page_idx = p["page"] - 1
+        if page_idx < 0 or page_idx >= len(pages):
+            continue
+
+        page = pages[page_idx]
+        page_w, page_h = get_page_size(page)
+        x = p.get("x", 0)
+        y = p.get("y", 0)
+        scale = p.get("scale", 1.0)
+        rotation = p.get("rotation", 0)
+
+        overlay = PageObject.create_blank_page(width=sheet_w, height=sheet_h)
+        overlay.merge_page(page)
+
+        transform = Transformation()
+        if rotation:
+            # Rotation autour du centre de la page
+            cx = page_w / 2
+            cy = page_h / 2
+            transform = transform.translate(-cx, -cy)
+            transform = transform.rotate(rotation)
+            transform = transform.translate(cx, cy)
+        transform = transform.scale(scale, scale).translate(x, y)
+        overlay.add_transformation(transform)
+        sheet.merge_page(overlay)
+
+        if crop_marks:
+            scaled_w = page_w * scale
+            scaled_h = page_h * scale
+            mark_positions.extend([
+                (x, y),
+                (x + scaled_w, y),
+                (x, y + scaled_h),
+                (x + scaled_w, y + scaled_h),
+            ])
+
+    if crop_marks and mark_positions:
+        marks = create_crop_marks_page(sheet_w, sheet_h, mark_positions)
+        sheet.merge_page(marks)
+
+    writer.add_page(sheet)
+
+    with open(output_path, "wb") as f:
+        writer.write(f)
+    return output_path