Lasers

Scripts/Weapons/LaserBullet.cs

@@ -0,0 +1,82 @@
+using System.Linq;
+using Godot;
+
+namespace Cirno.Scripts.Weapons;
+
+public partial class LaserBullet : Bullet
+{
+    private Line2D _beam;
+    private Timer _preFireTimer;
+    private Timer _lethalTimer;
+    private Timer _spawnDelayTimer;
+    private bool _isLethal = false;
+    
+    public override void _Ready()
+    {
+        base._Ready();
+        _beam = new Line2D
+        {
+            DefaultColor = BulletInfo.PreFireColor,
+            Width = 1,
+            Visible = false
+        };
+        AddChild(_beam);
+        _beam.GlobalPosition = this.GlobalPosition;
+        
+        // Delay before the beam appears
+        _spawnDelayTimer = new Timer { WaitTime = BulletInfo.SpawnDelay, OneShot = true };
+        _spawnDelayTimer.Timeout += ShowBeam;
+        AddChild(_spawnDelayTimer);
+        _spawnDelayTimer.Start();
+        
+        FireLaser();
+    }
+
+    public void FireLaser()
+    {
+        Vector2 endPoint = GetLaserEndPoint(GlobalPosition, BulletInfo.Direction);
+
+        _beam.ClearPoints();
+        _beam.AddPoint(Vector2.Zero);
+        _beam.AddPoint(ToLocal(endPoint));
+
+        _preFireTimer = new Timer { WaitTime = BulletInfo.PreFireTime, OneShot = true };
+        _preFireTimer.Timeout += MakeLethal;
+        AddChild(_preFireTimer);
+        _preFireTimer.Start();
+    }
+
+    private void ShowBeam()
+    {
+        _beam.Visible = true;
+    }
+
+    private void MakeLethal()
+    {
+        _isLethal = true;
+        _beam.DefaultColor = BulletInfo.LethalColor;
+        _beam.Width = 3;
+
+        _lethalTimer = new Timer { WaitTime = BulletInfo.LethalTime, OneShot = true };
+        _lethalTimer.Timeout += QueueFree; // Destroy after lethal phase
+        AddChild(_lethalTimer);
+        _lethalTimer.Start();
+    }
+
+    protected override void RotateBullet(float degrees)
+    {
+        base.RotateBullet(degrees);
+        
+        _beam.SetPointPosition(_beam.Points.Length -1, ToLocal(GetLaserEndPoint(GlobalPosition, _direction)));
+    }
+    
+    private Vector2 GetLaserEndPoint(Vector2 start, Vector2 direction)
+    {
+        var spaceState = GetWorld2D().DirectSpaceState;
+        var query = PhysicsRayQueryParameters2D.Create(start, start + direction * 1000);
+        query.CollisionMask = 1 << 0; // World layer
+        var result = spaceState.IntersectRay(query);
+
+        return result.Count > 0 ? (Vector2)result["position"] : start + direction * 1000;
+    }
+}