refactor: extract wire connectivity into module with KiCad-native IU matching
Move wire connectivity logic from _handle_get_wire_connections into commands/wire_connectivity.py. Use KiCad's internal integer unit system (10,000 IU/mm) with exact coordinate matching instead of tolerance-based float comparison, mirroring how KiCad itself determines connectivity. Key improvements: - Exact integer matching for wire endpoints (O(1) dict lookup vs O(n) grid scan) - Junction support for T-connections - Multi-unit symbol support (removed incorrect processed_refs dedup) - Single public API: get_wire_connections() Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Eugene Mikhantyev
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python/commands/wire_connectivity.py
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214
python/commands/wire_connectivity.py
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"""
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Wire Connectivity Analysis for KiCad Schematics
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Traces wire networks from a point and finds connected component pins.
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Uses KiCad's internal integer unit system (10,000 IU per mm) for exact
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coordinate matching, mirroring KiCad's own connectivity algorithm.
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"""
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import logging
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from pathlib import Path
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from typing import Dict, List, Optional, Set, Tuple
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from commands.pin_locator import PinLocator
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logger = logging.getLogger('kicad_interface')
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_IU_PER_MM = 10000 # KiCad schematic internal units per millimeter
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_QUERY_TOLERANCE_IU = 5000 # 0.5 mm in IU — for user-supplied query points
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def _to_iu(x_mm: float, y_mm: float) -> Tuple[int, int]:
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"""Convert mm coordinates to KiCad internal units (integer)."""
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return (round(x_mm * _IU_PER_MM), round(y_mm * _IU_PER_MM))
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def _parse_wires(schematic) -> List[List[Tuple[int, int]]]:
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"""Extract wire endpoints from a schematic object as IU tuples."""
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all_wires = []
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for wire in schematic.wire:
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if hasattr(wire, "pts") and hasattr(wire.pts, "xy"):
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pts = []
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for point in wire.pts.xy:
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if hasattr(point, "value"):
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pts.append(_to_iu(float(point.value[0]), float(point.value[1])))
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if len(pts) >= 2:
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all_wires.append(pts)
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return all_wires
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def _parse_junctions(schematic) -> List[Tuple[int, int]]:
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"""Extract junction points from a schematic object as IU tuples.
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Junctions may be exposed via schematic.junction (kicad-skip attribute) or
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might not exist. Handle both cases gracefully.
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"""
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junctions = []
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if not hasattr(schematic, 'junction'):
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return junctions
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for junc in schematic.junction:
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try:
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if hasattr(junc, 'at') and hasattr(junc.at, 'value'):
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junctions.append(_to_iu(float(junc.at.value[0]), float(junc.at.value[1])))
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except (IndexError, TypeError, ValueError):
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continue
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return junctions
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def _build_adjacency(
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all_wires: List[List[Tuple[int, int]]],
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junctions: List[Tuple[int, int]],
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) -> Tuple[List[Set[int]], Dict[Tuple[int, int], Set[int]]]:
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"""Build wire adjacency using exact IU coordinate matching.
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Returns a tuple of:
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- adjacency: list of sets, one per wire, containing adjacent wire indices
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- iu_to_wires: dict mapping each IU endpoint to the set of wire indices
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that have an endpoint at that exact coordinate (used for seed queries)
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"""
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# Map each IU endpoint to all wire indices that touch it
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iu_to_wires: Dict[Tuple[int, int], Set[int]] = {}
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for i, pts in enumerate(all_wires):
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for pt in pts:
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iu_to_wires.setdefault(pt, set()).add(i)
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# Wires that share an IU endpoint are adjacent
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adjacency: List[Set[int]] = [set() for _ in range(len(all_wires))]
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for wire_set in iu_to_wires.values():
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wire_list = list(wire_set)
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for a in wire_list:
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for b in wire_list:
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if a != b:
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adjacency[a].add(b)
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# Junctions: connect all wires that have an endpoint at the junction IU point
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for junc_iu in junctions:
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wire_set = iu_to_wires.get(junc_iu, set())
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wire_list = list(wire_set)
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for a in wire_list:
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for b in wire_list:
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if a != b:
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adjacency[a].add(b)
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return adjacency, iu_to_wires
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def _find_connected_wires(
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x_mm: float,
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y_mm: float,
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all_wires: List[List[Tuple[int, int]]],
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iu_to_wires: Dict[Tuple[int, int], Set[int]],
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adjacency: List[Set[int]],
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) -> Tuple:
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"""BFS from query point. Returns (visited wire indices, net IU points) or (None, None).
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Uses _QUERY_TOLERANCE_IU for the seed step because user-supplied coordinates
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may be imprecise. Wire-to-wire matching inside _build_adjacency is exact.
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"""
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query_iu = _to_iu(x_mm, y_mm)
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# Find seed wires: any wire whose endpoint is within _QUERY_TOLERANCE_IU of the query
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seed_indices: Set[int] = set()
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for iu_pt, wire_indices in iu_to_wires.items():
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if (abs(iu_pt[0] - query_iu[0]) <= _QUERY_TOLERANCE_IU and
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abs(iu_pt[1] - query_iu[1]) <= _QUERY_TOLERANCE_IU):
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seed_indices.update(wire_indices)
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if not seed_indices:
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return (None, None)
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# BFS flood-fill using pre-compiled adjacency
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visited: Set[int] = set(seed_indices)
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queue = list(seed_indices)
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net_points: Set[Tuple[int, int]] = set()
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for i in seed_indices:
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net_points.update(all_wires[i])
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while queue:
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wire_idx = queue.pop()
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for neighbor_idx in adjacency[wire_idx]:
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if neighbor_idx not in visited:
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visited.add(neighbor_idx)
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queue.append(neighbor_idx)
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net_points.update(all_wires[neighbor_idx])
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return (visited, net_points)
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def _find_pins_on_net(
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net_points: Set[Tuple[int, int]],
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schematic_path,
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schematic,
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) -> List[Dict]:
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"""Find component pins that land on net points.
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Uses exact IU matching with a ±_PIN_TOLERANCE_IU neighbourhood to guard
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against floating-point round-trip differences between wire and pin coordinates.
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Returns a list of {"component": ref, "pin": pin_num} dicts.
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"""
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def _on_net(px_mm: float, py_mm: float) -> bool:
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pin_iu = _to_iu(px_mm, py_mm)
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if pin_iu in net_points:
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return True
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x, y = pin_iu
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return ((x+1, y) in net_points or (x-1, y) in net_points or
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(x, y+1) in net_points or (x, y-1) in net_points)
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locator = PinLocator()
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pins = []
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seen: Set[Tuple] = set()
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ref = None
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for symbol in schematic.symbol:
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try:
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if not hasattr(symbol, 'property') or not hasattr(symbol.property, "Reference"):
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continue
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ref = symbol.property.Reference.value
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if ref.startswith("_TEMPLATE"):
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continue
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all_pins = locator.get_all_symbol_pins(Path(schematic_path), ref)
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if not all_pins:
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continue
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for pin_num, pin_data in all_pins.items():
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if _on_net(pin_data[0], pin_data[1]):
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key = (ref, pin_num)
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if key not in seen:
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seen.add(key)
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pins.append({"component": ref, "pin": pin_num})
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except Exception as e:
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logger.warning(f"Error checking pins for {ref if ref is not None else '<unknown>'}: {e}")
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return pins
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def get_wire_connections(schematic, schematic_path: str, x_mm: float, y_mm: float) -> Optional[Dict]:
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"""Find all component pins reachable from a point via connected wires.
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Returns dict with keys:
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- "pins": list of {"component": str, "pin": str}
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- "wires": list of {"start": {"x", "y"}, "end": {"x", "y"}} in mm
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Or None if no wire found at the query point.
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"""
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all_wires = _parse_wires(schematic)
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if not all_wires:
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return {"pins": [], "wires": []}
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junctions = _parse_junctions(schematic)
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adjacency, iu_to_wires = _build_adjacency(all_wires, junctions)
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visited, net_points = _find_connected_wires(x_mm, y_mm, all_wires, iu_to_wires, adjacency)
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if visited is None:
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return None
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wires_out = [
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{"start": {"x": all_wires[i][0][0] / _IU_PER_MM, "y": all_wires[i][0][1] / _IU_PER_MM},
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"end": {"x": all_wires[i][-1][0] / _IU_PER_MM, "y": all_wires[i][-1][1] / _IU_PER_MM}}
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for i in visited
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]
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if not hasattr(schematic, "symbol"):
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return {"pins": [], "wires": wires_out}
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pins = _find_pins_on_net(net_points, schematic_path, schematic)
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return {"pins": pins, "wires": wires_out}
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