refactor

src/Poe2Trade.Navigation/StuckDetector.cs

@@ -0,0 +1,40 @@
+namespace Poe2Trade.Navigation;
+
+/// <summary>
+/// Detects when the player hasn't moved significantly over a window of frames.
+/// </summary>
+internal class StuckDetector
+{
+    private readonly double _threshold;
+    private readonly int _frameCount;
+    private int _counter;
+    private MapPosition? _lastPosition;
+
+    public bool IsStuck => _counter >= _frameCount;
+
+    public StuckDetector(double threshold, int frameCount)
+    {
+        _threshold = threshold;
+        _frameCount = frameCount;
+    }
+
+    public void Update(MapPosition position)
+    {
+        if (_lastPosition != null)
+        {
+            var dx = position.X - _lastPosition.X;
+            var dy = position.Y - _lastPosition.Y;
+            if (Math.Sqrt(dx * dx + dy * dy) < _threshold)
+                _counter++;
+            else
+                _counter = 0;
+        }
+        _lastPosition = position;
+    }
+
+    public void Reset()
+    {
+        _counter = 0;
+        _lastPosition = null;
+    }
+}