Mark the CQ frequency on the bandmap and leave Run when the radio moves off it

Starting Run stores the frequency in the position. The bandmap draws a
purple, bold "CQ Frequency" pseudospot there, which is not added to the
shared bandmap, and a click on it tunes back and sets Run. A move of more
than 3 kHz (a setting on the telnet Filters tab) while running switches
to search and pounce.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Nonemm.App/AppSession.cs

@@ -313,7 +313,7 @@ public sealed partial class AppSession : IDisposable
         positions.Clear();
         for (int number = 1; number <= PositionCount; number++)
         {
-            positions.Add(new OperatingPosition(Logging, number));
+            positions.Add(new OperatingPosition(Logging, number) { CqLeaveHertz = Settings.CqLeaveHertz });
         }
         activeRadio = Math.Min(activeRadio, positions.Count - 1);
         // the other stations refuse to resynchronise with a station on another
@@ -995,6 +995,10 @@ public sealed partial class AppSession : IDisposable
     {
         spotFilter = Settings.SpotFilter.ToFilter(BandPlan, Settings.Station, Countries, Calls, History);
         Bandmap.Lifetime = TimeSpan.FromMinutes(Math.Max(1, Settings.SpotTimeoutMinutes));
+        foreach (OperatingPosition position in positions)
+        {
+            position.CqLeaveHertz = Settings.CqLeaveHertz;
+        }
     }
 
     public void ReloadSupportFiles()

src/Nonemm.App/Configuration/Settings.cs

@@ -105,6 +105,10 @@ public sealed record Settings
     /// boxes are wiped. N1MM uses 2 kHz.
     public int QsySpotHertz { get; init; } = 2000;
 
+    /// How far the radio can move off the CQ frequency, in hertz, before a
+    /// running position goes back to searching.
+    public int CqLeaveHertz { get; init; } = 3000;
+
     public int TuningToleranceFor(ModeCategory mode) => mode switch
     {
         ModeCategory.Phone => PhoneTuningToleranceHertz,

src/Nonemm.App/Windows/BandmapView.cs

@@ -181,7 +181,7 @@ public sealed class BandmapView : Control
             new Point(ScaleX + 2, label.MarkY),
             new Point(LabelX - 2, label.LabelY + (LabelHeight / 2)));
         context.DrawText(
-            Text(label.Spot.Call.Text, colour, TextSize, label.Spot.IsLocal),
+            Text(label.Spot.Call.Text, colour, TextSize, label.Spot.IsLocal || label.Spot.IsCqFrequency),
             new Point(LabelX, label.LabelY + (LabelPadding / 2)));
     }
 

src/Nonemm.App/Windows/BandmapWindow.axaml.cs

@@ -34,15 +34,19 @@ public sealed partial class BandmapWindow : RefreshableWindow
 
     private readonly AppSession session;
     private readonly Action<Frequency, string> tune;
+    private readonly Action<Frequency> returnToCq;
 
     /// Where the slice was last drawn from, so it stays put until the receiver
     /// nears an edge.
     private Frequency? sliceLow;
 
-    public BandmapWindow(AppSession session, Action<Frequency, string> tune)
+    private static readonly IBrush CqBrush = new SolidColorBrush(Color.FromRgb(0x9B, 0x59, 0xB6));
+
+    public BandmapWindow(AppSession session, Action<Frequency, string> tune, Action<Frequency> returnToCq)
     {
         this.session = session;
         this.tune = tune;
+        this.returnToCq = returnToCq;
         InitializeComponent();
         SpanBox.ItemsSource = Spans.Select(s => s.Label).ToList();
         SpanBox.SelectedIndex = Math.Max(
@@ -59,7 +63,17 @@ public sealed partial class BandmapWindow : RefreshableWindow
         CentreBox.IsCheckedChanged += (_, _) => SaveView();
         View.Zoomed += (_, zoom) => Zoom(zoom);
         View.ColourOf = Colour;
-        View.SpotPicked += (_, spot) => tune(spot.Frequency, spot.Call.Text);
+        View.SpotPicked += (_, spot) =>
+        {
+            if (spot.IsCqFrequency)
+            {
+                returnToCq(spot.Frequency);
+            }
+            else
+            {
+                tune(spot.Frequency, spot.Call.Text);
+            }
+        };
         View.FrequencyPicked += (_, frequency) => tune(frequency, "");
         session.Bandmap.Changed += (_, _) => Dispatcher.UIThread.Post(Refresh);
         Refresh();
@@ -95,12 +109,24 @@ public sealed partial class BandmapWindow : RefreshableWindow
         long shown = high.Hertz - low.Hertz;
         View.TickStep = StepFor(shown);
         View.DenseTicks = shown is > 40_000 and <= 200_000;
-        View.Spots = session.Bandmap.On(band);
+        View.Spots = WithCqFrequency(session.Bandmap.On(band), band);
         View.Vfos = Vfos();
         View.Segments = session.BandPlan.For(band);
         View.InvalidateVisual();
     }
 
+    /// The bandmap's spots with the pseudospot for the CQ frequency, when the
+    /// position has one on this band. It is added here and not to the bandmap,
+    /// so it does not age out and the other windows do not list it.
+    private IReadOnlyList<Spot> WithCqFrequency(IReadOnlyList<Spot> spots, Band band)
+    {
+        if (session.Position?.CqFrequency is not { } cq || Bands.ForFrequency(cq) != band)
+        {
+            return spots;
+        }
+        return [.. spots.Append(Spot.CqFrequency(cq, DateTime.UtcNow)).OrderBy(s => s.Frequency.Hertz)];
+    }
+
     /// Green for where the operator is listening, red for where the radio
     /// transmits when working split, orange for the other radio of a two-radio
     /// station.
@@ -165,7 +191,8 @@ public sealed partial class BandmapWindow : RefreshableWindow
         _ => Frequency.FromKilohertz(50),
     };
 
-    private IBrush Colour(Spot spot) => Verdicts.Colour(VerdictFor(spot));
+    private IBrush Colour(Spot spot) =>
+        spot.IsCqFrequency ? CqBrush : Verdicts.Colour(VerdictFor(spot));
 
     private Verdict? VerdictFor(Spot spot)
     {

src/Nonemm.App/Windows/EntryWindow.CallFrame.cs

@@ -12,10 +12,6 @@ namespace Nonemm.App.Windows;
 /// which is how a station is worked without typing its call.
 public sealed partial class EntryWindow
 {
-    /// Where we last called CQ, so the frame can say so when the radio comes
-    /// back to it.
-    private Frequency cqFrequency;
-
     /// What the frame holds, when it holds a callsign. `CQ-Frequency` is not
     /// one, and neither is nothing.
     private string framedCall = "";
@@ -35,7 +31,7 @@ public sealed partial class EntryWindow
             CallFrameText.Text = "";
             return;
         }
-        if (cqFrequency.Hertz > 0
+        if (Logging.CqFrequency is { } cqFrequency
             && Math.Abs(Logging.Frequency.Hertz - cqFrequency.Hertz) <= TuningTolerance.Hertz)
         {
             CallFrameText.Text = "CQ-Frequency";
@@ -86,7 +82,7 @@ public sealed partial class EntryWindow
     {
         if (Logging is not null)
         {
-            cqFrequency = Logging.Frequency;
+            Logging.CqFrequency = Logging.Frequency;
         }
     }
 }

src/Nonemm.App/Windows/EntryWindow.Menu.cs

@@ -462,7 +462,7 @@ public sealed partial class EntryWindow
 
     private void OnShowCheck(object? sender, RoutedEventArgs e) => Show(() => new CheckWindow(session));
 
-    private void OnShowBandmap(object? sender, RoutedEventArgs e) => Show(() => new BandmapWindow(session, Tune));
+    private void OnShowBandmap(object? sender, RoutedEventArgs e) => Show(() => new BandmapWindow(session, Tune, ReturnToCq));
 
     private void OnShowAvailable(object? sender, RoutedEventArgs e) =>
         Show(() => new AvailableWindow(session, Tune));
@@ -712,6 +712,14 @@ public sealed partial class EntryWindow
         }
     }
 
+    /// A click on the CQ frequency on the bandmap: back to where the CQs went
+    /// out, and running again.
+    private void ReturnToCq(Frequency frequency)
+    {
+        Tune(frequency, "");
+        SetRunning(true);
+    }
+
     private void Tune(Frequency frequency, string call)
     {
         if (Logging is null)

src/Nonemm.App/Windows/EntryWindow.Operators.cs

@@ -109,7 +109,7 @@ public sealed partial class EntryWindow
     [
         (nameof(LogWindow), () => _ = Show(() => new LogWindow(session), activate: false)),
         (nameof(CheckWindow), () => _ = Show(() => new CheckWindow(session), activate: false)),
-        (nameof(BandmapWindow), () => _ = Show(() => new BandmapWindow(session, Tune), activate: false)),
+        (nameof(BandmapWindow), () => _ = Show(() => new BandmapWindow(session, Tune, ReturnToCq), activate: false)),
         (nameof(AvailableWindow), () => _ = Show(() => new AvailableWindow(session, Tune), activate: false)),
         (nameof(ScoreWindow), () => _ = Show(() => new ScoreWindow(session), activate: false)),
         (nameof(StatisticsWindow), () => _ = Show(() => new StatisticsWindow(session), activate: false)),

src/Nonemm.App/Windows/TelnetWindow.Filters.cs

@@ -50,6 +50,7 @@ public sealed partial class TelnetWindow
         BlockedCallsBox.Text = string.Join(' ', filter.BlockedCalls);
         TimeoutBox.Text = session.Settings.SpotTimeoutMinutes.ToString(CultureInfo.InvariantCulture);
         QsySpotBox.Text = session.Settings.QsySpotHertz.ToString(CultureInfo.InvariantCulture);
+        CqLeaveBox.Text = session.Settings.CqLeaveHertz.ToString(CultureInfo.InvariantCulture);
         SpotCommentBox.Text = session.Settings.SpotComment;
     }
 
@@ -74,6 +75,7 @@ public sealed partial class TelnetWindow
             RandomizeSpots = RandomizeBox.IsChecked == true,
             SpotTimeoutMinutes = Minutes(TimeoutBox.Text, session.Settings.SpotTimeoutMinutes),
             QsySpotHertz = Minutes(QsySpotBox.Text, session.Settings.QsySpotHertz),
+            CqLeaveHertz = Minutes(CqLeaveBox.Text, session.Settings.CqLeaveHertz),
         });
         Show("*** filters applied — they hold for the spots that arrive from now on", NoticeColour);
     }

src/Nonemm.App/Windows/TelnetWindow.axaml

@@ -124,6 +124,8 @@
           <TextBox Name="TimeoutBox" Width="60" HorizontalAlignment="Left" />
           <TextBlock Classes="label" Text="Spot a call locally when the radio moves more than (Hz)" />
           <TextBox Name="QsySpotBox" Width="60" HorizontalAlignment="Left" />
+          <TextBlock Classes="label" Text="Go back to search and pounce when the radio moves off the CQ frequency by more than (Hz)" TextWrapping="Wrap" />
+          <TextBox Name="CqLeaveBox" Width="60" HorizontalAlignment="Left" />
           <Button Content="Apply" Click="OnApplyFilters" Margin="0,10,0,0" />
         </StackPanel>
       </ScrollViewer>