seemingly working, added display text

Program.cs

@@ -13,9 +13,8 @@ public class Program
     private const double DrawFrequency = 60.0;
     private static Scenario scenario;
 
-    // Speed control (existing + new throttle)
+    // Speed control
     private static double desiredSpeed = 0.01;
-    //private static double desiredSpeed = 1.0;
     private static double currentSpeed = desiredSpeed;
     private const double MinSpeed = 0.0001;
     private const double MaxSpeed = 1.0;
@@ -24,22 +23,47 @@ public class Program
     private static double lastDesiredSpeed = 0.1;
     private static bool isRealTime = false;
 
-    // Throttle smoothing
-    private static double targetThrottle = 0.0;   // 1.0 when W is pressed, 0.0 otherwise
+    // Throttle smoothing (unused but kept)
+    private static double targetThrottle = 0.0;
     private static double currentThrottle = 0.0;
-    private const double ThrottleSmoothing = 20.0; // rate of change
+    private const double ThrottleSmoothing = 20.0;
 
     private static volatile bool running = true;
 
+    // ---- Overlay text ----
+    private static Font? overlayFont;
+    private static Text? overlayText;
+
     public static void Main()
     {
         var mode = new VideoMode(new Vector2u(1280, 720));
-        var window = new RenderWindow(mode, "FluidSim - Engine (W = throttle)");
+        var window = new RenderWindow(mode, "FluidSim");
         window.SetVerticalSyncEnabled(true);
         window.Closed += (_, _) => { running = false; window.Close(); };
         window.MouseWheelScrolled += OnMouseWheel;
         window.KeyPressed += OnKeyPressed;
 
+        // ---- Load font ----
+        try
+        {
+            overlayFont = new Font("fonts/FiraCodeNerdFont-Medium.ttf");
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Failed to load font 'fonts/LiberationMono-Regular.ttf': {ex.Message}");
+            overlayFont = null;   // will skip text drawing
+        }
+
+        if (overlayFont != null)
+        {
+            // SFML 3 Text(font, character size in pixels)
+            overlayText = new Text(overlayFont)
+            {
+                FillColor = Color.White,
+                Position = new Vector2f(10, 10)
+            };
+        }
+
         var soundEngine = new SoundEngine(bufferCapacity: 16384);
         soundEngine.Volume = 100;
         soundEngine.Start();
@@ -74,7 +98,6 @@ public class Program
             double speedSmoothing = 8.0;
             currentSpeed += (desiredSpeed - currentSpeed) * (1.0 - Math.Exp(-speedSmoothing * dtClock));
 
-
             // Generate audio
             double targetAudioClock = currentRealTime + 0.05;
             while (totalOutputSamples < targetAudioClock * SampleRate && running)
@@ -116,21 +139,30 @@ public class Program
                     break;
             }
 
-            // Drawing & title
+            // Drawing
             if (currentRealTime - lastDrawTime >= drawInterval)
             {
                 double actualSpeed = totalOutputSamples / (currentRealTime * SampleRate);
-                double simTime = totalSimSteps / (double)SampleRate;
-                string toggleHint = isRealTime ? "[Space] slow mo" : "[Space] real time";
-                string throttleHint = Keyboard.IsKeyPressed(Keyboard.Key.W) ? "W held" : "W released";
-                window.SetTitle(
-                    $"{toggleHint}  {throttleHint}  " +
-                    $"Thr: {currentThrottle:F2}  " +
-                    $"Speed: {currentSpeed:F3}x → {desiredSpeed:F3}x  " +
-                    $"Act: {actualSpeed:F2}x"
-                );
+                double realtimePercent = totalOutputSamples / (currentRealTime * SampleRate) * 100.0;
+
+                // Update overlay text
+                if (overlayText != null)
+                {
+                    string toggleHint = isRealTime ? "[Space] slow mo" : "[Space] real time";
+                    string throttleHint = Keyboard.IsKeyPressed(Keyboard.Key.W) ? "W held" : "W released";
+                    overlayText.DisplayedString =
+                        $"{toggleHint}  {throttleHint}  " +
+                        $"Speed: {currentSpeed:F3}x  " +
+                        $"RT: {realtimePercent:F1}%";
+                }
+
                 window.Clear(Color.Black);
                 scenario.Draw(window);
+
+                // Draw the overlay on top
+                if (overlayText != null)
+                    window.Draw(overlayText);
+
                 window.Display();
                 lastDrawTime = currentRealTime;
             }
@@ -140,7 +172,6 @@ public class Program
         window.Dispose();
     }
 
-    // (Mouse wheel, space toggle unchanged)
     private static void OnMouseWheel(object? sender, MouseWheelScrollEventArgs e)
     {
         bool wasRealTime = Math.Abs(desiredSpeed - 1.0) < 1e-6;