()
| 56 | # ── helpers ────────────────────────────────────────────────────────────────── |
| 57 | |
| 58 | def _make_preview_pen() -> QPen: |
| 59 | pen = QPen(Qt.black, 1.2) |
| 60 | pen.setStyle(Qt.DashLine) |
| 61 | return pen |
| 62 | |
| 63 | |
| 64 | def _build_path(points: list[QPointF]) -> QPainterPath: |