Tweaked AITarget ranges: now it's possible to evade some monsters by stopping the sub and/or turning off noisy devices, AITarget ranges can be made visible by entering "ShowAITargets" in the console, misc cleanup

Subsurface/Source/Characters/AI/AITarget.cs

@@ -1,30 +1,31 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
 
 namespace Barotrauma
 {
     class AITarget
     {
+        public static bool ShowAITargets;
+
         public static List<AITarget> List = new List<AITarget>();
 
         public Entity Entity;
 
-        protected float soundRange;
-        protected float sightRange;
+        private float soundRange;
+        private float sightRange;
         
         public float SoundRange
         {
-            get 
-            {
-                return soundRange;
-            }
-            set { soundRange = value; }
+            get { return soundRange; }
+            set { soundRange = Math.Max(value, 0.0f); }
         }
 
         public float SightRange
         {
             get { return sightRange; }
-            set { sightRange = value; }
+            set { sightRange = Math.Max(value, 0.0f); }
         }
 
         public Vector2 WorldPosition
@@ -48,5 +49,24 @@ namespace Barotrauma
             List.Remove(this);
         }
 
+        public void Draw(SpriteBatch spriteBatch)
+        {
+            if (!ShowAITargets) return;
+
+            var rangeSprite = GUI.SubmarineIcon;
+
+            if (soundRange > 0.0f)
+                rangeSprite.Draw(spriteBatch,
+                    new Vector2(WorldPosition.X, -WorldPosition.Y),
+                    Color.Cyan * 0.1f, rangeSprite.Origin,
+                    0.0f, soundRange / rangeSprite.size.X);
+
+            if (sightRange > 0.0f)
+                rangeSprite.Draw(spriteBatch,
+                    new Vector2(WorldPosition.X, -WorldPosition.Y),
+                    Color.Orange * 0.1f, rangeSprite.Origin,
+                    0.0f, sightRange / rangeSprite.size.X);
+        }
+
     }
 }