TDR:prevent zooming if no data

Author: zielaskowski

src/NanoVNASaver/Charts/TDR.py

@@ -37,7 +37,6 @@
 )
 from PySide6.QtWidgets import QDialog, QInputDialog, QMenu, QSizePolicy
 
-from ..RFTools import Datapoint
 from .Chart import Chart, ChartPosition
 
 logger = logging.getLogger(__name__)
@@ -343,10 +342,6 @@ def copy(self) -> "TDRChart":
 
     def wheelEvent(self, a0: QWheelEvent) -> None:
         a0.accept()
-        self.data = [
-            Datapoint(0, 0.0, 0.0)
-        ]  # A bit of cheating otherwise the super().wheelEvent() exits
-        # without doing anything.
         super().wheelEvent(a0)
 
     def mouseMoveEvent(self, a0: QMouseEvent) -> None:

src/NanoVNASaver/Windows/TDR.py

@@ -28,6 +28,7 @@
 from scipy.constants import speed_of_light  # type: ignore
 from scipy.signal import convolve  # type: ignore
 
+from ..RFTools import Datapoint
 from .Defaults import make_scrollable
 from .ui import get_window_icon
 
@@ -292,6 +293,10 @@ def updateTDR(self):
         self.tdr_result_label.setText(f"{cable_len}m ({feet}ft {inches}in)")
         self.app.tdr_result_label.setText(f"{cable_len}m")
         self.td = list(td)
+        self.app.tdr_chart.data = [
+            Datapoint(0, 0.0, 0.0)
+        ]  # A bit of cheating otherwise the super().wheelEvent() exits
+        # without doing anything.
         self.updated.emit()
 
     def _tdr_lowpass(self, tdr_format, s11, tdr_window) -> np.ndarray: