1 files changed, 107 insertions, 0 deletions
diff --git a/V3/Map/FogOfWar.cs b/V3/Map/FogOfWar.cs
new file mode 100644
index 0000000..a243b60
--- /dev/null
+++ b/V3/Map/FogOfWar.cs
@@ -0,0 +1,107 @@
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Graphics;
+using V3.Objects;
+
+namespace V3.Map
+{
+    // ReSharper disable once ClassNeverInstantiated.Global
+    public sealed class FogOfWar
+    {
+        private const int FogRange = 64;
+        private const int SightRadius = 1000;
+        private Point mMapSize;
+        private Texture2D mFog;
+        private readonly List<Rectangle> mFogRectangle = new List<Rectangle>();
+
+        /// <summary>
+        /// Get the size of the map and create an boolean array
+        /// </summary>
+        /// <param name="size">the size of the map</param>
+        public void LoadGrid(Point size)
+        {
+            mMapSize = size;
+            CreateArray();
+        }
+
+        /// <summary>
+        /// An array so save whether the sprites already walked on this area
+        /// </summary>
+        private void CreateArray()
+        {
+            for (int i = -FogRange; i < mMapSize.Y; i += FogRange)
+            {
+                for (int j = -FogRange * 2; j < mMapSize.X; j += FogRange)
+                {
+                    mFogRectangle.Add(new Rectangle(j, i, mFog.Width, mFog.Height));
+                }
+            }
+        }
+
+        /// <summary>
+        /// The position from creatures which can open the fog
+        /// </summary>
+        /// <param name="creature">creatures which are able to open the fog</param>
+        public void Update(ICreature creature)
+        {
+            Ellipse creatureEllipse = new Ellipse(creature.Position, SightRadius, SightRadius);
+            var markedForDeletion = new List<Rectangle>();
+            foreach (var fog in mFogRectangle)
+            {
+                if (!creature.IsDead && creatureEllipse.Contains(fog.Center.ToVector2()))
+                {
+                    markedForDeletion.Add(fog);
+                }
+            }
+            foreach (var fogToDelete in markedForDeletion)
+            {
+                mFogRectangle.Remove(fogToDelete);
+            }
+        }
+
+        /// <summary>
+        /// The sprite for the fog
+        /// </summary>
+        /// <param name="content"></param>
+        public void LoadContent(ContentManager content)
+        {
+            mFog = content.Load<Texture2D>("Sprites/cloud");
+        }
+
+        /// <summary>
+        /// Try to draw fog of war efficiently.
+        /// </summary>
+        /// <param name="spriteBatch">Sprite batch used.</param>
+        public void DrawFog(SpriteBatch spriteBatch)
+        {
+            /*
+            var screen = camera.ScreenRectangle;
+            int fogPerRow = (mMapSize.X + FogRange) / FogRange;
+            int fogPerColumn = (mMapSize.Y + FogRange) / FogRange;
+            for (int i = screen.Y / FogRange; i < (screen.Y + screen.Height) / FogRange; i++)
+            {
+                for (int j = screen.X / FogRange; j < (screen.X + screen.Width) / FogRange; j++)
+                {
+                    spriteBatch.Draw(mFog, mFogRectangle[i * fogPerRow], Color.Black);
+                }
+            }
+            */
+            foreach (var fog in mFogRectangle)
+            {
+                spriteBatch.Draw(mFog, fog, Color.Black);
+            }
+        }
+
+        public void SetFog(List<Rectangle> fog)
+        {
+            mFogRectangle.Clear();
+            mFogRectangle.AddRange(fog);
+        }
+
+        public List<Rectangle> GetFog()
+        {
+            return mFogRectangle;
+        }
+    }
+}