Merge pull request #1281 from gqrx-sdr/amplitude-axis-fix

Fix inconsistent 1-2-5 scaling of amplitude axis
gqrx-sdr · Sep 27, 2023 · 72dda81 · 72dda81
2 parents 273e4ef + 0dfcada
commit 72dda81
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diff --git a/resources/news.txt b/resources/news.txt
@@ -36,6 +36,7 @@
      FIXED: Crash in AFSK1200 decoder.
      FIXED: Y axis in saved waterfall is too narrow.
      FIXED: Hang when setting a very narrow filter width.
+     FIXED: Inconsistent 1-2-5 scaling of amplitude axis.
 
 
       2.16: Released April 28, 2023

diff --git a/src/qtgui/plotter.cpp b/src/qtgui/plotter.cpp
@@ -2223,8 +2223,9 @@ void CPlotter::drawOverlay()
     // Level grid
     qint64 mindBAdj64 = 0;
     qint64 dbDivSize = 0;
+    qint64 dbSpan = (qint64) (m_PandMaxdB - m_PandMindB);
 
-    calcDivSize((qint64) m_PandMindB, (qint64) m_PandMaxdB,
+    calcDivSize((qint64) m_PandMindB, ((qint64) m_PandMindB) + dbSpan,
                 qMax(h / (m_VdivDelta * m_DPR), (qreal)VERT_DIVS_MIN),
                 mindBAdj64, dbDivSize, m_VerDivs);