plotter: prevent zooming gain out-of-bounds

In some situations, it was possible to zoom in a way that causes the minimum dB value in the plotter to become too low.
gqrx-sdr · Aug 11, 2023 · 197fae6 · 197fae6
1 parent 60bf96d
commit 197fae6
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/qtgui/plotter.cpp b/src/qtgui/plotter.cpp
@@ -1025,6 +1025,9 @@ void CPlotter::wheelEvent(QWheelEvent * event)
             m_PandMaxdB = FFT_MAX_DB;
 
         m_PandMindB = m_PandMaxdB - db_range;
+        if (m_PandMindB < FFT_MIN_DB)
+            m_PandMindB = FFT_MIN_DB;
+
         m_MaxHoldValid = false;
         m_MinHoldValid = false;
         m_histIIRValid = false;