plot tab remembers now value, satellite, points

gui/plot_tab.py

@@ -38,7 +38,7 @@ class PlotTab(QWidget):
             frame.setFrameShadow(QFrame.Raised)
             fl = QVBoxLayout(frame)
             fl.setContentsMargins(2, 2, 2, 2)
-            pw = SinglePlotWidget(model)
+            pw = SinglePlotWidget(model, plot_index=i)
             pw.setMinimumHeight(230)
             fl.addWidget(pw)
             grid.addWidget(frame, i // 2, i % 2)

gui/plot_widget.py

@@ -1,8 +1,24 @@
-import sys, os, math, time
+import sys, os, math, time, json
 from datetime   import datetime
 from queue      import Queue, Empty
 from collections import deque
 
+_SETTINGS_PATH = os.path.expanduser('~/.nmea_client_plots.json')
+
+def _load_plot_settings() -> list:
+    try:
+        with open(_SETTINGS_PATH) as f:
+            return json.load(f).get('plots', [])
+    except Exception:
+        return []
+
+def _save_plot_settings(settings: list):
+    try:
+        with open(_SETTINGS_PATH, 'w') as f:
+            json.dump({'plots': settings}, f, indent=2)
+    except Exception:
+        pass
+
 _root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 _gui  = os.path.dirname(os.path.abspath(__file__))
 for _p in [_root, _gui]:
@@ -256,13 +272,16 @@ class _Canvas(QWidget):
 # ── Single configurable plot ──────────────────────────────────────────────────
 
 class SinglePlotWidget(QWidget):
-    def __init__(self, model: ReceiverManager):
+    def __init__(self, model: ReceiverManager, plot_index: int = 0):
         super().__init__()
-        self._model = model
+        self._model       = model
+        self._plot_index  = plot_index
         self._data:       dict = {}   # rid → [deque(ts), deque(val)]
         self._known_sats: dict = {}   # rid → set[sat_label]  (selected only)
+        self._restore_sat = ''        # persisted satellite, applied on first combo fill
 
         self._build_ui()
+        self._load_settings()
 
         self._thread = PlotRenderThread()
         self._thread.frame_ready.connect(self._canvas.set_image)
@@ -296,7 +315,7 @@ class SinglePlotWidget(QWidget):
         bar.addWidget(QLabel("Satellit:"))
         self._val_cb = QComboBox()
         self._val_cb.setMinimumWidth(90); self._val_cb.setMaximumWidth(120)
-        self._val_cb.currentTextChanged.connect(self._submit_render)
+        self._val_cb.currentTextChanged.connect(self._on_sat_changed)
         bar.addWidget(self._val_cb)
 
         bar.addWidget(QLabel("Quelle:"))
@@ -332,9 +351,39 @@ class SinglePlotWidget(QWidget):
                 result.append(it.data(Qt.UserRole))
         return result
 
+    # ── Persistence ───────────────────────────────────────────────────────────
+
+    def _load_settings(self):
+        all_s = _load_plot_settings()
+        s = all_s[self._plot_index] if self._plot_index < len(all_s) else {}
+        if 'y_axis' in s:
+            self._y_cb.blockSignals(True)
+            self._y_cb.setCurrentText(s['y_axis'])
+            self._y_cb.blockSignals(False)
+            self._val_cb.setEnabled(s['y_axis'] != 'pDOP')
+        if 'history' in s:
+            self._hist_spin.blockSignals(True)
+            self._hist_spin.setValue(s['history'])
+            self._hist_spin.blockSignals(False)
+        if 'satellite' in s:
+            self._restore_sat = s['satellite']
+
+    def _save_settings(self):
+        all_s = _load_plot_settings()
+        while len(all_s) <= self._plot_index:
+            all_s.append({})
+        all_s[self._plot_index] = {
+            'y_axis':    self._y_cb.currentText(),
+            'satellite': self._val_cb.currentText(),
+            'history':   self._hist_spin.value(),
+        }
+        _save_plot_settings(all_s)
+
+    # ── Source helpers ────────────────────────────────────────────────────────
+
     def _rebuild_val_combo(self):
         selected = set(self._selected_rids())
-        current  = self._val_cb.currentText()
+        current  = self._val_cb.currentText() or self._restore_sat
         self._val_cb.blockSignals(True)
         self._val_cb.clear()
         sats = set()
@@ -344,6 +393,7 @@ class SinglePlotWidget(QWidget):
             self._val_cb.addItem(s)
         if current in sats:
             self._val_cb.setCurrentText(current)
+            self._restore_sat = ''
         self._val_cb.blockSignals(False)
 
     # ── Render submission ─────────────────────────────────────────────────────
@@ -369,12 +419,17 @@ class SinglePlotWidget(QWidget):
 
     # ── Config change handlers ────────────────────────────────────────────────
 
+    def _on_sat_changed(self, _text: str):
+        self._save_settings()
+        self._submit_render()
+
     def _on_y_changed(self, _text: str):
         is_pdop = (_text == 'pDOP')
         self._val_cb.setEnabled(not is_pdop)
         for rid in list(self._data):
             n = self._hist_spin.value()
             self._data[rid] = [deque(maxlen=n), deque(maxlen=n)]
+        self._save_settings()
         self._submit_render()
 
     def _on_source_changed(self):
@@ -385,6 +440,7 @@ class SinglePlotWidget(QWidget):
         for rid in list(self._data):
             old_ts, old_v   = self._data[rid]
             self._data[rid] = [deque(old_ts, maxlen=n), deque(old_v, maxlen=n)]
+        self._save_settings()
         self._submit_render()
 
     # ── Model signals ─────────────────────────────────────────────────────────