Files
kicad-zone-resistance/fill_resistance/main.py
T
janik 92bb29637f Model sub-resolution traces as exact 1D resistor chains
Tracks are now first-class Problem objects (TrackSeg: centerline +
width, dump schema v5), so the wide/narrow decision replays at raster
time: traces at least TRACK_1D_FACTOR (3) cells wide rasterize from
their outline as before; narrower ones mark the cells their centerline
crosses as copper and connect them with explicit conductance links
carrying the trace's TRUE arc length per link - no staircase inflation
for diagonals or arcs, and no discretization error in the trace R, at
any grid size. Links across cells already joined by pour faces are
skipped (union, not sum); chain-only cells get no sheet faces (their
copper is narrower than a cell). Electrodes, via barrels, connectivity
restriction and the skin-effect scaling all work on chain cells
unchanged.

This removes the need to shrink the cell size for thin traces: a 0.2 mm
bridge at 500 um cells now matches its finely-rasterized ground truth
within a few percent (tested), including diagonal and arc traces.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-15 16:02:01 +07:00

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"""Top-level orchestration for the KiCad-launched action.
Flow: connect -> read the two selected contacts (rectangles/pads) ->
gather fills -> selection dialog (net, layers, contacts, current, cell)
-> extract vias -> solve -> figures + report.
Every failure is reported twice: on stdout (lands in the KiCad status-bar
warning list) and as a matplotlib error figure, so it cannot be missed.
"""
from __future__ import annotations
import sys
import traceback
from . import config, pipeline, report
from .errors import CandidateError, UserFacingError
def _fail(message: str, outdir) -> None:
print(f"ERROR: {message}")
from . import plots
fig = plots.fig_error(message)
plots.save_and_show([(fig, "error")], outdir)
sys.exit(1)
def main() -> None:
outdir = None
try:
from kipy.errors import ApiError
from . import board_io, dialog
try:
kicad, board = board_io.connect()
stackup = board_io.get_stackup_info(board)
es1, es2, net_hint = board_io.get_electrodes(board)
if board_io.any_zone_unfilled(board) or config.ALWAYS_REFILL:
board_io.refill(board)
fills = board_io.gather_net_fills(board)
tracks = board_io.gather_net_tracks(board)
copper = board_io.merge_copper(
fills, board_io.tracks_as_polygons(tracks))
candidate_nets = board_io.nets_overlapping(copper, es1, es2)
buildups = board_io.gather_mask_buildups(board)
except ApiError as e:
raise UserFacingError(
f"KiCad API error: {e}\nIf KiCad is showing a dialog, close "
f"it and run again."
)
if not candidate_nets:
raise CandidateError(
"No copper (zone fill or trace) overlaps both contacts. "
"Check that both sit over copper of the same net and that "
"the fills are up to date (press B in the board editor)."
)
def group_label(parts):
names = [p.label for p in parts[:3]]
more = f" +{len(parts) - 3}" if len(parts) > 3 else ""
return f"{len(parts)}× " + ", ".join(names) + more
def group_contact(parts):
contacts = {p.contact for p in parts}
return contacts.pop() if len(contacts) == 1 else "auto"
default_net = (net_hint if net_hint in candidate_nets
else candidate_nets[0])
selection = dialog.ask(
candidates={n: list(copper[n].keys()) for n in candidate_nets},
layer_order=stackup.names,
default_net=default_net,
e1_label=group_label(es1), e2_label=group_label(es2),
contact1=group_contact(es1), contact2=group_contact(es2),
buildup_layers=sorted(buildups.keys()),
)
if selection is None:
print("cancelled")
return
if selection.contact1 != "auto":
for e in es1:
e.contact = selection.contact1
if selection.contact2 != "auto":
for e in es2:
e.contact = selection.contact2
if selection.cell_um is not None:
config.CELL_UM_OVERRIDE = selection.cell_um
try:
problem = board_io.build_problem(
board, selection.net, selection.layers, es1, es2, stackup,
fills,
buildups=(buildups if selection.include_buildup else None),
extra_cu_um=selection.extra_cu_um,
tracks=(tracks if selection.include_tracks else None))
outdir = report.make_output_dir(board_io.board_dir(board))
except ApiError as e:
raise UserFacingError(f"KiCad API error: {e}")
report.write_geometry_dump(outdir, problem)
pipeline.run(problem, outdir, show=True, i_test=selection.current_a,
freq_hz=selection.freq_hz,
contact_model=selection.contact_model)
except UserFacingError as e:
_fail(str(e), outdir)
except Exception:
_fail(traceback.format_exc(), outdir)
if __name__ == "__main__":
main()