Electrical junction dot — always user-managed. Junctions are auto-placed when a wire drawing operation creates a new T-intersection, but they are ordinary objects after that: selectable, movable, and deletable. There is no separate 'auto' type.
| 12 | |
| 13 | |
| 14 | class JunctionItem(QGraphicsEllipseItem): |
| 15 | """ |
| 16 | Electrical junction dot — always user-managed. |
| 17 | |
| 18 | Junctions are auto-placed when a wire drawing operation creates a new |
| 19 | T-intersection, but they are ordinary objects after that: selectable, |
| 20 | movable, and deletable. There is no separate 'auto' type. |
| 21 | """ |
| 22 | |
| 23 | def __init__(self, center: QPointF): |
| 24 | r = JUNCTION_RADIUS |
| 25 | super().__init__(-r, -r, 2 * r, 2 * r) |
| 26 | self.setPos(center) |
| 27 | self.setPen(QPen(Qt.NoPen)) |
| 28 | self.setBrush(QBrush(JUNCTION_COLOR)) |
| 29 | self.setZValue(Z_JUNCTION) |
| 30 | self.setFlag(QGraphicsItem.ItemIsSelectable) |
| 31 | self.setFlag(QGraphicsItem.ItemIsMovable) |
| 32 | self.setFlag(QGraphicsItem.ItemSendsGeometryChanges) |
| 33 | |
| 34 | def boundingRect(self) -> QRectF: |
| 35 | r = JUNCTION_RADIUS + _SEL_PAD |
| 36 | return QRectF(-r, -r, 2.0 * r, 2.0 * r) |
| 37 | |
| 38 | def itemChange(self, change, value): |
| 39 | if change == QGraphicsItem.ItemPositionChange: |
| 40 | snapped = snap(value) |
| 41 | if self.scene() and not getattr(self.scene(), '_group_drag_active', False): |
| 42 | delta = snapped - self.pos() |
| 43 | if delta.x() or delta.y(): |
| 44 | self._rubber_band_wires(delta) |
| 45 | return snapped |
| 46 | return super().itemChange(change, value) |
| 47 | |
| 48 | def _rubber_band_wires(self, delta: QPointF) -> None: |
| 49 | """Move wire endpoints that currently touch this junction.""" |
| 50 | from .wire_item import WireItem |
| 51 | pos_key = _pt_key(self.pos()) |
| 52 | for item in self.scene().items(): |
| 53 | if not isinstance(item, WireItem): |
| 54 | continue |
| 55 | hits = {i for i, pt in enumerate(item.points) if _pt_key(pt) == pos_key} |
| 56 | if hits: |
| 57 | item.move_points(hits, delta) |
no outgoing calls
no test coverage detected