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kicad-zone-resistance/fill_resistance/dialog.py
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janikandClaude Fable 5 8aff1c0be9
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Trim threshold: absolute A/mm2 variant next to the relative one
The dialog threshold field gets a unit selector: % of mean |J|
(default, as before) or absolute A/mm2. The absolute variant applies
at the solved operating point - |J| scales with the test current, so
it is meant to be used with the real operating current entered as the
test current (config comment, README and dialog say so).

Switching units swaps in the other unit config default
(TRIM_THRESHOLD_A_MM2 = 1.0 for absolute) but never clobbers a number
the user typed. Validation stays per unit: 0..100 for %, > 0 for
A/mm2. pipeline.run takes trim_pct/trim_abs (at most one), compute()
mirrors that, and the JSON records threshold_mode + threshold_value
next to the resolved threshold_a_per_mm2.

Suite on dev 3.13 and the Python 3.9 mac-stack venv: 151 passed each;
dialog wiring exercised offscreen (defaults, unit swap, validation).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-24 14:21:13 +07:00

332 lines
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"""Qt selection dialog shown on plugin launch: net, layers, per-electrode
contact, test current, optional cell size. PySide6 is already a plugin
dependency (matplotlib QtAgg backend); the QApplication created here is
reused by matplotlib afterwards.
"""
from __future__ import annotations
from dataclasses import dataclass
from PySide6.QtCore import Qt
from PySide6.QtWidgets import (QApplication, QCheckBox, QComboBox, QDialog,
QDialogButtonBox, QFormLayout, QHBoxLayout,
QLabel, QLineEdit, QListWidget,
QListWidgetItem, QVBoxLayout, QWidget)
from . import config, skin
ALL_LAYERS = "All selected layers"
AUTO_CONTACT = "(auto: per contact part)"
MODEL_LABELS = {
"uniform": "Uniform injection (conductor pressed on top)",
"equipotential": "Equipotential (ideal bonded lug)",
}
@dataclass
class Selection:
net: str
layers: list[str]
contact1: str # "auto", "all" or layer name
contact2: str
current_a: float
cell_um: float | None
freq_hz: float = 0.0
contact_model: str = "uniform"
include_buildup: bool = False
extra_cu_um: float = 0.0
include_tracks: bool = True
vias_capped: bool = True
cap_max_drill_mm: float = 0.5
adaptive: bool = True
push_overlays: bool = False # EXPERIMENTAL in-KiCad |J| overlays
trim_enabled: bool = False # EXPERIMENTAL low-current copper marking
trim_mode: str = "pct" # "pct" (% of the mean |J|) or "abs" (A/mm2)
trim_value: float = 10.0 # threshold in the unit trim_mode names
class _Dialog(QDialog):
def __init__(self, candidates: dict[str, list[str]], layer_order: list[str],
default_net: str, e1_label: str, e2_label: str,
contact1: str, contact2: str, buildup_layers: list[str]):
super().__init__()
self.setWindowTitle("Fill Resistance")
self.setWindowFlag(Qt.WindowStaysOnTopHint, True)
self._candidates = candidates
self._layer_order = layer_order
form = QFormLayout()
self.net_box = QComboBox()
for net in sorted(candidates):
self.net_box.addItem(net)
self.net_box.setCurrentText(default_net)
form.addRow("Signal (net):", self.net_box)
self.layer_list = QListWidget()
self.layer_list.setMaximumHeight(120)
form.addRow("Layers:", self.layer_list)
self.tracks_check = QCheckBox("include the net's traces "
"(tracks + arcs)")
self.tracks_check.setChecked(config.INCLUDE_TRACKS)
form.addRow("Conductors:", self.tracks_check)
self.capped_check = QCheckBox(
f"vias filled + capped ({config.CAP_PLATING_UM:g} µm cap; "
f"off = open mouths)")
self.capped_check.setChecked(config.VIAS_CAPPED)
form.addRow("Vias:", self.capped_check)
self.cap_drill_edit = QLineEdit(f"{config.CAP_MAX_DRILL_MM:g}")
self.cap_drill_edit.setEnabled(config.VIAS_CAPPED)
self.capped_check.toggled.connect(self.cap_drill_edit.setEnabled)
form.addRow("Capped up to drill [mm]:", self.cap_drill_edit)
self.adaptive_check = QCheckBox(
"adaptive cells (coarsen plane interiors; faster on large "
"boards, corrected to ≲0.03 % of the uniform grid)")
self.adaptive_check.setChecked(config.ADAPTIVE_CELLS)
form.addRow("Grid:", self.adaptive_check)
self.contact1_box = QComboBox()
self.contact2_box = QComboBox()
form.addRow(f"V+ ({e1_label}):", self.contact1_box)
form.addRow(f"V ({e2_label}):", self.contact2_box)
self.model_box = QComboBox()
for key in ("uniform", "equipotential"):
self.model_box.addItem(MODEL_LABELS[key], key)
default_index = 0 if config.CONTACT_MODEL == "uniform" else 1
self.model_box.setCurrentIndex(default_index)
form.addRow("Contact model:", self.model_box)
self.current_edit = QLineEdit(f"{config.TEST_CURRENT_A:g}")
form.addRow("Test current [A]:", self.current_edit)
self.freq_edit = QLineEdit("")
self.freq_edit.setPlaceholderText("0 = DC (e.g. 142k, 1.5M)")
form.addRow("Frequency [Hz]:", self.freq_edit)
self.cell_edit = QLineEdit("")
self.cell_edit.setPlaceholderText("auto")
form.addRow("Cell size [µm]:", self.cell_edit)
self.buildup_check = QCheckBox(
f"{config.SOLDER_THICKNESS_UM:g} µm solder on mask openings"
+ (f" ({', '.join(buildup_layers)})" if buildup_layers
else " (none found)"))
self.buildup_check.setChecked(bool(buildup_layers)
and config.INCLUDE_MASK_BUILDUP)
self.buildup_check.setEnabled(bool(buildup_layers))
form.addRow("Buildup:", self.buildup_check)
self.extracu_edit = QLineEdit(f"{config.BUILDUP_EXTRA_CU_UM:g}")
self.extracu_edit.setEnabled(bool(buildup_layers))
form.addRow("Extra Cu in openings [µm]:", self.extracu_edit)
first, last = config.OVERLAY_LAYERS[0], config.OVERLAY_LAYERS[-1]
self.overlay_check = QCheckBox(
f"experimental: push per-layer |J| heatmaps into the board as "
f"reference images on {first}..{last} (replaces images there; "
f"layers must be enabled in Board Setup)")
self.overlay_check.setChecked(config.PUSH_OVERLAYS)
form.addRow("Overlays:", self.overlay_check)
tfirst, tlast = config.TRIM_LAYERS[0], config.TRIM_LAYERS[-1]
self.trim_check = QCheckBox(
f"experimental: mark copper below the threshold as polygons "
f"on {tfirst}..{tlast} (replaces polygons there; a suggestion "
f"only - removing copper shifts current elsewhere)")
self.trim_check.setChecked(config.TRIM_ENABLED)
form.addRow("Low-current copper:", self.trim_check)
self.trim_mode_box = QComboBox()
self.trim_mode_box.addItem("% of mean |J|", "pct")
self.trim_mode_box.addItem("A/mm²", "abs")
self.trim_mode_box.setCurrentIndex(1 if config.TRIM_MODE == "abs"
else 0)
self.trim_edit = QLineEdit(self._trim_default())
for w in (self.trim_edit, self.trim_mode_box):
w.setEnabled(config.TRIM_ENABLED)
self.trim_check.toggled.connect(w.setEnabled)
self.trim_mode_box.currentIndexChanged.connect(
self._trim_mode_changed)
trim_row = QWidget()
trim_lay = QHBoxLayout(trim_row)
trim_lay.setContentsMargins(0, 0, 0, 0)
trim_lay.addWidget(self.trim_edit, 1)
trim_lay.addWidget(self.trim_mode_box)
form.addRow("Threshold:", trim_row)
buttons = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
buttons.accepted.connect(self._try_accept)
buttons.rejected.connect(self.reject)
lay = QVBoxLayout(self)
lay.addLayout(form)
note = QLabel("Multiple layers are coupled through the net's "
"via/through-pad barrels. f > 0 applies only the "
"foil-thickness skin effect (a lower bound on the "
"resistance rise) - not an AC impedance simulation: "
"proximity and inductance are not modeled.")
note.setWordWrap(True)
note.setStyleSheet("color: gray; font-size: 10px;")
lay.addWidget(note)
self.error_label = QLabel("")
self.error_label.setWordWrap(True)
self.error_label.setStyleSheet("color: #b02a2a;")
self.error_label.setVisible(False)
lay.addWidget(self.error_label)
lay.addWidget(buttons)
self._selection: Selection | None = None
self._desired1, self._desired2 = contact1, contact2
self.net_box.currentTextChanged.connect(self._refresh)
self._refresh()
def _trim_default(self, mode: str | None = None) -> str:
mode = mode or self.trim_mode_box.currentData()
return (f"{config.TRIM_THRESHOLD_A_MM2:g}" if mode == "abs"
else f"{config.TRIM_THRESHOLD_PCT:g}")
def _trim_mode_changed(self):
# swap in the new unit's default, but never clobber a number the
# user typed themselves
mode = self.trim_mode_box.currentData()
other = "pct" if mode == "abs" else "abs"
if self.trim_edit.text().strip() in ("", self._trim_default(other)):
self.trim_edit.setText(self._trim_default(mode))
def _refresh(self):
self.error_label.setVisible(False)
net = self.net_box.currentText()
layers = [n for n in self._layer_order
if n in self._candidates.get(net, [])]
self.layer_list.clear()
for name in layers:
item = QListWidgetItem(name)
item.setFlags(item.flags() | Qt.ItemIsUserCheckable)
item.setCheckState(Qt.Checked)
self.layer_list.addItem(item)
for box, desired in ((self.contact1_box, self._desired1),
(self.contact2_box, self._desired2)):
box.clear()
box.addItem(AUTO_CONTACT)
box.addItem(ALL_LAYERS)
box.addItems(layers)
if desired == "all":
box.setCurrentText(ALL_LAYERS)
elif desired in layers:
box.setCurrentText(desired)
def checked_layers(self) -> list[str]:
out = []
for i in range(self.layer_list.count()):
item = self.layer_list.item(i)
if item.checkState() == Qt.Checked:
out.append(item.text())
return out
def _build_selection(self) -> Selection:
"""Parse and validate every field; raises ValueError with a
user-readable message instead of silently substituting defaults
(a typo silently becoming 1 A / DC would mislabel the result)."""
layers = self.checked_layers()
if not layers:
raise ValueError("Check at least one layer.")
def number(edit: QLineEdit, name: str) -> float:
text = edit.text().strip()
try:
return float(skin.normalize_decimal(text))
except ValueError as exc:
if "separator" in str(exc):
raise ValueError(f"{name}: {exc}")
raise ValueError(f"{name}: '{text}' is not a number.")
current = number(self.current_edit, "Test current")
if current <= 0:
raise ValueError("Test current must be > 0 A.")
cell = None
if self.cell_edit.text().strip():
cell = number(self.cell_edit, "Cell size")
if cell <= 0:
raise ValueError("Cell size must be > 0 µm.")
try:
freq = skin.parse_frequency(self.freq_edit.text())
except ValueError as exc:
# as in number(): keep parse_frequency's own explanation for
# the inputs it rejects deliberately, not just "unparseable"
if any(k in str(exc) for k in ("separator", "negative")):
raise ValueError(f"Frequency: {exc}")
raise ValueError(
f"Frequency: cannot parse '{self.freq_edit.text()}' "
f"(examples: 0, 142k, 1.5M).")
extra_cu = 0.0
if self.extracu_edit.isEnabled():
extra_cu = number(self.extracu_edit, "Extra Cu")
if extra_cu < 0:
raise ValueError("Extra Cu must be ≥ 0 µm.")
trim_mode = self.trim_mode_box.currentData()
trim_value = float(self._trim_default(trim_mode))
if self.trim_check.isChecked():
trim_value = number(self.trim_edit, "Trim threshold")
if trim_mode == "pct" and not 0 < trim_value < 100:
raise ValueError("Trim threshold must be between 0 and "
"100 (% of the mean |J|).")
if trim_mode == "abs" and trim_value <= 0:
raise ValueError("Trim threshold must be > 0 A/mm².")
cap_max_drill = config.CAP_MAX_DRILL_MM
if self.capped_check.isChecked():
cap_max_drill = number(self.cap_drill_edit, "Capped up to drill")
if cap_max_drill <= 0:
raise ValueError("Capped-up-to drill must be > 0 mm.")
def contact(box: QComboBox) -> str:
t = box.currentText()
if t == AUTO_CONTACT:
return "auto"
return "all" if t == ALL_LAYERS else t
return Selection(net=self.net_box.currentText(), layers=layers,
contact1=contact(self.contact1_box),
contact2=contact(self.contact2_box),
current_a=current, cell_um=cell,
freq_hz=freq,
contact_model=self.model_box.currentData(),
include_buildup=self.buildup_check.isChecked(),
extra_cu_um=extra_cu,
include_tracks=self.tracks_check.isChecked(),
vias_capped=self.capped_check.isChecked(),
cap_max_drill_mm=cap_max_drill,
adaptive=self.adaptive_check.isChecked(),
push_overlays=self.overlay_check.isChecked(),
trim_enabled=self.trim_check.isChecked(),
trim_mode=trim_mode, trim_value=trim_value)
def _try_accept(self) -> None:
try:
self._selection = self._build_selection()
except ValueError as e:
self.error_label.setText(str(e))
self.error_label.setVisible(True)
return
self.accept()
def ask(candidates: dict[str, list[str]], layer_order: list[str],
default_net: str, e1_label: str, e2_label: str,
contact1: str, contact2: str,
buildup_layers: list[str] | None = None) -> Selection | None:
"""Show the dialog; returns None on cancel."""
app = QApplication.instance() or QApplication([])
dlg = _Dialog(candidates, layer_order, default_net, e1_label, e2_label,
contact1, contact2, buildup_layers or [])
dlg.raise_()
dlg.activateWindow()
if dlg.exec() != QDialog.Accepted:
return None
return dlg._selection