[WIP] feat: A vispy-based stage tracker

examples/stage_recorder.py

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+import useq
+from pymmcore_plus import CMMCorePlus
+from qtpy.QtWidgets import QApplication
+
+from pymmcore_widgets import StageWidget
+from pymmcore_widgets._stage_recorder import StageRecorder
+
+app = QApplication([])
+
+mmc = CMMCorePlus().instance()
+mmc.loadSystemConfiguration()
+
+mmc.setProperty("Camera", "Mode", "Noise")
+
+rec = StageRecorder()
+rec.poll_xy_stage = True
+rec.show()
+
+s = StageWidget(mmc.getXYStageDevice())
+s.setStep(300)
+s.show()
+
+
+seq = useq.MDASequence(
+    channels=["FITC"],
+    grid_plan=useq.GridRowsColumns(
+        rows=4,
+        columns=4,
+        fov_width=mmc.getImageWidth() * mmc.getPixelSizeUm(),
+        fov_height=mmc.getImageHeight() * mmc.getPixelSizeUm(),
+    ),
+    stage_positions=[(0, 0)],
+)
+
+mmc.run_mda(seq)
+
+app.exec()

examples/stage_tracker.py

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+"""Example usage of the SnapButton class."""
+
+import useq
+from pymmcore_plus import CMMCorePlus
+from qtpy.QtWidgets import QApplication
+
+from pymmcore_widgets import StageWidget
+from pymmcore_widgets._stage_tracker import StageTracker
+
+app = QApplication([])
+
+mmc = CMMCorePlus().instance()
+mmc.loadSystemConfiguration()
+
+track = StageTracker()
+track.poll_xy_stage = True
+track.show()
+
+seq = useq.MDASequence(
+    channels=[{"config": "FITC", "exposure": 200}],
+    grid_plan=useq.GridRowsColumns(
+        rows=4,
+        columns=4,
+        fov_width=mmc.getImageWidth() * mmc.getPixelSizeUm(),
+        fov_height=mmc.getImageHeight() * mmc.getPixelSizeUm(),
+    ),
+    stage_positions=[(0, 0)],
+)
+
+mmc.run_mda(seq)
+
+s = StageWidget(mmc.getXYStageDevice())
+s.setStep(300)
+s.show()
+
+app.exec()