af66debcde
Add the QGraphicsView layer: NodeItem (SVG symbol + title + draggable, snap-to-grid), PortItem (relation-colored anchors with compatibility hints), EdgeItem (orthogonal routing, arc hops on crossings, line styles, head/tail decorations, animated flow dashes), and DiagramScene binding the document to items with edge-drawing interaction and a grid background. Add EditorController with a QUndoStack (add/connect/delete/move/edit) and scene interaction tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
30 lines
761 B
Python
30 lines
761 B
Python
"""Cached access to bundled SVG node symbols."""
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from __future__ import annotations
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import os
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from PyQt6.QtSvg import QSvgRenderer
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_NODES_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "resources", "nodes")
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_cache: dict[str, QSvgRenderer] = {}
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def nodes_dir() -> str:
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return _NODES_DIR
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def renderer(svg_name: str) -> QSvgRenderer | None:
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"""Return a cached, valid QSvgRenderer for ``svg_name`` or None."""
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if not svg_name:
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return None
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r = _cache.get(svg_name)
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if r is None:
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path = os.path.join(_NODES_DIR, svg_name)
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if not os.path.exists(path):
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return None
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r = QSvgRenderer(path)
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if not r.isValid():
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return None
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_cache[svg_name] = r
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return r
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