add initial project files and configurations, including EventBus, systems, and resources

Code/Systems/CameraShakeSystem.cs

@@ -0,0 +1,72 @@
+using Godot;
+using MaxEffort.Code.Core;
+
+namespace MaxEffort.Code.Systems;
+
+[GlobalClass]
+public partial class CameraShakeSystem : Node
+{
+    [Export] private Camera2D _camera;
+    [Export] private float _decayRate = 0.8f;  // How fast shaking stops
+    [Export] private float _maxOffset = 20.0f; // Max pixels to shake
+    [Export] private float _maxRoll = 0.1f;    // Max rotation (radians)
+    
+    private float _trauma = 0f; // Current shake intensity (0 to 1)
+    private float _currentFocus = 0f;
+    private RandomNumberGenerator _rng = new();
+    
+    public override void _Ready()
+    {
+        EventBus.OnCameraTrauma += AddTrauma;
+        EventBus.OnFocusChanged += OnFocusChanged;
+    }
+
+    public override void _ExitTree()
+    {
+        EventBus.OnCameraTrauma -= AddTrauma;
+        EventBus.OnFocusChanged -= OnFocusChanged;
+    }
+
+    public override void _Process(double delta)
+    {
+        if (_camera == null) return;
+        
+        if (_currentFocus > 0.75f)
+        {
+            AddTrauma(1.5f * (float)delta); 
+        }
+        
+        if (_trauma > 0)
+        {
+            _trauma -= _decayRate * (float)delta;
+            _trauma = Mathf.Max(0, _trauma);
+
+            var shake = _trauma * _trauma;
+            
+            var offsetX = _maxOffset * shake * _rng.RandfRange(-1, 1);
+            var offsetY = _maxOffset * shake * _rng.RandfRange(-1, 1);
+            var rotation = _maxRoll * shake * _rng.RandfRange(-1, 1);
+
+            _camera.Offset = new Vector2(offsetX, offsetY);
+            _camera.Rotation = rotation;
+        }
+        else
+        {
+            if (_camera.Offset != Vector2.Zero) 
+            {
+                _camera.Offset = _camera.Offset.Lerp(Vector2.Zero, (float)delta * 5f);
+                _camera.Rotation = Mathf.Lerp(_camera.Rotation, 0, (float)delta * 5f);
+            }
+        }
+    }
+    
+    private void OnFocusChanged(float focus)
+    {
+        _currentFocus = focus;
+    }
+    
+    private void AddTrauma(float amount)
+    {
+        _trauma = Mathf.Clamp(_trauma + amount, 0f, 1f);
+    }
+}