more accurate submarine body generation, multiplayer fixes, saving takes HiddenSubPosition into account, fire coordinate fixes, editscreen fixes, checking item triggers in AIObjectiveGoto, netlobbyscreen sync fixes, re-enabled level start/end positions, water edit fixed

Subsurface/Source/Characters/BackgroundSprite/BackgroundCreature.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xml.Linq;
+
+namespace Barotrauma
+{
+
+    class BackgroundCreature : ISteerable
+    {
+        const float MaxDepth = 100.0f;
+
+        const float CheckWallsInterval = 5.0f;
+
+        public bool Enabled;
+
+        private BackgroundCreaturePrefab prefab;
+
+        private Vector2 position;
+
+        private Vector3 velocity;
+
+        private float depth;
+        
+        private SteeringManager steeringManager;
+
+        private float checkWallsTimer;
+
+        public Swarm Swarm;
+
+        Vector2 drawPosition;
+        public Vector2 TransformedPosition
+        {
+            get { return drawPosition; }
+        }
+
+        public Vector2 SimPosition
+        {
+            get { return position; }
+        }
+
+        public Vector2 Velocity
+        {
+            get { return new Vector2(velocity.X, velocity.Y); }
+        }
+
+        public Vector2 Steering
+        {
+            get;
+            set;
+        }
+        
+        public BackgroundCreature(BackgroundCreaturePrefab prefab, Vector2 position)
+        {
+            this.prefab = prefab;
+
+            this.position = position;
+
+            drawPosition = position;
+
+            steeringManager = new SteeringManager(this);
+
+            velocity = new Vector3(
+                Rand.Range(-prefab.Speed, prefab.Speed),
+                Rand.Range(-prefab.Speed, prefab.Speed),
+                Rand.Range(0.0f, prefab.WanderZAmount));
+
+            checkWallsTimer = Rand.Range(0.0f, CheckWallsInterval);
+            
+        }
+
+        float ang;
+        Vector2 obstacleDiff;
+
+        public void Update(float deltaTime)
+        {
+            position += new Vector2(velocity.X, velocity.Y) * deltaTime;
+            depth = MathHelper.Clamp(depth + velocity.Z * deltaTime, 0.0f, MaxDepth);
+
+            checkWallsTimer -= deltaTime;
+            if (checkWallsTimer<=0.0f && Level.Loaded!=null)
+            {
+                checkWallsTimer = CheckWallsInterval;
+
+                obstacleDiff = Vector2.Zero;
+
+                var cells = Level.Loaded.GetCells(position, 1);
+                if (cells.Count > 0)
+                {
+
+                    foreach (Voronoi2.VoronoiCell cell in cells)
+                    {
+                        obstacleDiff += cell.Center - position;
+                    }
+
+                    obstacleDiff = Vector2.Normalize(obstacleDiff) * prefab.Speed;
+                }
+            }            
+
+            if (Swarm!=null)
+            {
+                Vector2 midPoint = Swarm.MidPoint();
+                float midPointDist = Vector2.Distance(position, midPoint);
+
+                if (midPointDist > Swarm.MaxDistance)
+                {
+                    steeringManager.SteeringSeek(midPoint, (midPointDist / Swarm.MaxDistance) * prefab.Speed);
+                }
+            }
+
+            if (prefab.WanderAmount > 0.0f)
+            {
+                steeringManager.SteeringWander(prefab.Speed);
+            }
+
+            if (obstacleDiff != Vector2.Zero)
+            {
+                steeringManager.SteeringSeek(-obstacleDiff, prefab.Speed);
+            }
+
+            steeringManager.Update(prefab.Speed);
+
+            if (prefab.WanderZAmount>0.0f)
+            {
+                ang += Rand.Range(-prefab.WanderZAmount, prefab.WanderZAmount);
+                velocity.Z = (float)Math.Sin(ang)*prefab.Speed;
+            }
+            
+            velocity = Vector3.Lerp(velocity, new Vector3(Steering.X, Steering.Y, velocity.Z), deltaTime);
+        }
+
+        public void Draw(SpriteBatch spriteBatch)
+        {
+            float rotation = 0.0f;
+            if (!prefab.DisableRotation)
+            {
+                rotation = MathUtils.VectorToAngle(new Vector2(velocity.X, -velocity.Y));
+                if (velocity.X < 0.0f) rotation -= MathHelper.Pi;
+            }
+
+            drawPosition = position;// +Level.Loaded.Position;
+
+            if (depth > 0.0f)
+            {
+                Vector2 camOffset = drawPosition - GameMain.GameScreen.Cam.WorldViewCenter;
+
+                drawPosition -= camOffset * (depth / MaxDepth) * 0.05f;
+            }
+            
+            prefab.Sprite.Draw(spriteBatch, new Vector2(drawPosition.X, -drawPosition.Y), Color.Lerp(Color.White, Color.DarkBlue, (depth/MaxDepth)*0.3f),
+                rotation, 1.0f - (depth / MaxDepth) * 0.2f, velocity.X > 0.0f ? SpriteEffects.None : SpriteEffects.FlipHorizontally, (depth / MaxDepth));
+        }
+    }
+
+    class Swarm
+    {
+        public List<BackgroundCreature> Members;
+
+        public readonly float MaxDistance;
+
+        public Vector2 MidPoint()
+        {
+            if (Members.Count == 0) return Vector2.Zero;
+
+            Vector2 midPoint = Vector2.Zero;
+
+            foreach (BackgroundCreature member in Members)
+            {
+                midPoint += member.SimPosition;
+            }
+
+            midPoint /= Members.Count;
+
+            return midPoint;
+        }
+
+        public Vector2 AvgVelocity()
+        {
+            if (Members.Count == 0) return Vector2.Zero;
+
+            Vector2 avgVel = Vector2.Zero;
+
+            foreach (BackgroundCreature member in Members)
+            {
+                avgVel += member.Velocity;
+            }
+
+           avgVel /= Members.Count;
+
+            return avgVel;
+        }
+
+        public Swarm(List<BackgroundCreature> members, float maxDistance)
+        {
+            this.Members = members;
+
+            this.MaxDistance = maxDistance;
+
+            foreach (BackgroundCreature bgSprite in members)
+            {
+                bgSprite.Swarm = this;
+            }
+        }
+    }
+}