Initial Blockminers printer

scripts/boards.py

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+import math
+from pathlib import Path
+
+from .assets import load_json, load_rgb
+from .settings import BOARD_DECK, DECKS_DIR, BuildConfig
+
+
+def board_target_mm_for_mode(
+    board_path: Path,
+    board_mode: str,
+    board_custom_mm: tuple[float, float] | None = None,
+) -> tuple[float, float]:
+    if board_custom_mm is not None:
+        return board_custom_mm
+    ratio = board_aspect_ratio(board_path)
+    if board_mode == "a4-fit":
+        max_w, max_h = 210.0, 297.0
+        if ratio > max_w / max_h:
+            return max_w, max_w / ratio
+        return max_h * ratio, max_h
+    if board_mode == "a5-fit":
+        max_w, max_h = 148.0, 210.0
+        if ratio > max_w / max_h:
+            return max_w, max_w / ratio
+        return max_h * ratio, max_h
+
+    # Default: preserve aspect ratio while using approximately A5 area,
+    # capped to fit inside A4.
+    a5_area = 148.0 * 210.0
+    width = math.sqrt(a5_area * ratio)
+    height = math.sqrt(a5_area / ratio)
+    if width > 210.0 or height > 297.0:
+        scale = min(210.0 / width, 297.0 / height)
+        width *= scale
+        height *= scale
+    return width, height
+
+
+def board_aspect_ratio(board_path: Path) -> float:
+    deck_json = board_path.parent / "deck.json"
+    if deck_json.exists():
+        meta = load_json(deck_json)
+        if meta.get("cardWidth") and meta.get("cardHeight"):
+            return float(meta["cardWidth"]) / float(meta["cardHeight"])
+    with load_rgb(board_path) as img:
+        return img.width / img.height
+
+
+def board_target_mm(board_path: Path, config: BuildConfig) -> tuple[float, float]:
+    return board_target_mm_for_mode(board_path, config.board_mode, config.board_custom_mm)
+
+
+def board_mode_fits_paper(board_mode: str, paper_mm: tuple[float, float], margin_mm: float) -> bool:
+    usable_w = paper_mm[0] - 2 * margin_mm
+    usable_h = paper_mm[1] - 2 * margin_mm
+    board_paths = sorted((DECKS_DIR / BOARD_DECK).glob("*-jumbo-front.png"))
+    if not board_paths:
+        return True
+    for board_path in board_paths:
+        board_w, board_h = board_target_mm_for_mode(board_path, board_mode)
+        fits_upright = board_w <= usable_w and board_h <= usable_h
+        fits_rotated = board_h <= usable_w and board_w <= usable_h
+        if not (fits_upright or fits_rotated):
+            return False
+    return True