From c38595b3937cd4ccc4bba3c9fc8495a2f05dd97f Mon Sep 17 00:00:00 2001
From: Hans Kokx <hans.d.kokx@gmail.com>
Date: Fri, 13 Mar 2026 19:31:40 +0100
Subject: [PATCH] Guards can spot you

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>
---
 lib/features/renderer/renderer.dart | 61 +++++++++++++++++++++++++----
 1 file changed, 54 insertions(+), 7 deletions(-)

diff --git a/lib/features/renderer/renderer.dart b/lib/features/renderer/renderer.dart
index e5633ee..613c8e2 100644
--- a/lib/features/renderer/renderer.dart
+++ b/lib/features/renderer/renderer.dart
@@ -281,18 +281,26 @@ class _WolfRendererState extends State<WolfRenderer>
     }
     _spaceWasPressed = isSpacePressed;
 
-    // --- 4. UPDATE ENTITY SPRITES (8-WAY DIRECTIONAL) ---
+    // --- 4. UPDATE ENTITY LOGIC ---
     for (Entity entity in entities) {
+      // 1. Wake up if the player is spotted!
       if (entity.state == EntityState.idle) {
-        // Find angle from the guard TO the player
+        if (_hasLineOfSight(entity)) {
+          // "Halt!"
+          entity.state = EntityState.patrolling;
+          print("A guard spotted you!"); // Just for debugging
+        }
+      }
+
+      // 2. Visuals: 8-Way Directional Tracking
+      if (entity.state == EntityState.idle ||
+          entity.state == EntityState.patrolling) {
         double dx = player.x - entity.x;
         double dy = player.y - entity.y;
         double angleToPlayer = math.atan2(dy, dx);
 
-        // Find the difference between where the guard is facing and where the player is
         double diff = entity.angle - angleToPlayer;
 
-        // Wrap the angle to stay within -PI and +PI
         while (diff <= -math.pi) {
           diff += 2 * math.pi;
         }
@@ -300,12 +308,10 @@ class _WolfRendererState extends State<WolfRenderer>
           diff -= 2 * math.pi;
         }
 
-        // Snap that difference to one of 8 octants (45 degrees each)
-        // Sprite 50 is Front, 51 is Front-Right, 52 is Right, etc.
         int octant = ((diff + (math.pi / 8)) / (math.pi / 4)).floor() % 8;
         if (octant < 0) octant += 8;
 
-        // Base idle sprite for the Brown Guard is 50
+        // Base sprite for the Brown Guard
         entity.spriteIndex = 50 + octant;
       }
     }
@@ -349,6 +355,47 @@ class _WolfRendererState extends State<WolfRenderer>
     }
   }
 
+  bool _hasLineOfSight(Entity guard) {
+    double dx = player.x - guard.x;
+    double dy = player.y - guard.y;
+    double distance = math.sqrt(dx * dx + dy * dy);
+
+    // 1. FOV Check (Are you in front of them?)
+    double angleToPlayer = math.atan2(dy, dx);
+    double diff = guard.angle - angleToPlayer;
+
+    while (diff <= -math.pi) {
+      diff += 2 * math.pi;
+    }
+    while (diff > math.pi) {
+      diff -= 2 * math.pi;
+    }
+
+    // A standard guard FOV is about 180 degrees (90 degrees left/right)
+    if (diff.abs() > math.pi / 2) {
+      return false; // You are behind them!
+    }
+
+    // 2. Line of Sight Check (Are there walls in the way?)
+    double dirX = dx / distance;
+    double dirY = dy / distance;
+
+    // Step along the ray in small increments to check for solid blocks
+    double stepSize = 0.2;
+    for (double i = 0; i < distance; i += stepSize) {
+      int checkX = (guard.x + dirX * i).toInt();
+      int checkY = (guard.y + dirY * i).toInt();
+
+      // If we hit a solid wall or closed door, vision is blocked
+      if (!_isWalkable(checkX, checkY)) {
+        return false;
+      }
+    }
+
+    // If we made it all the way to the player without hitting a wall...
+    return true;
+  }
+
   @override
   Widget build(BuildContext context) {
     if (_isLoading) {