Got rid of previous material system, now uses enumerators and item ids. Also imported QuadTree.cs so we can have entity collision.

.idea/.idea.Collector/.idea/misc.xml

@@ -3,4 +3,7 @@
   <component name="JavaScriptSettings">
     <option name="languageLevel" value="ES6" />
   </component>
+  <component name="com.jetbrains.rider.android.RiderAndroidMiscFileCreationComponent">
+    <option name="ENSURE_MISC_FILE_EXISTS" value="true" />
+  </component>
 </project>

Collector.sln.DotSettings.user

@@ -2,5 +2,6 @@
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Biome/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=chunkpair/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Crosshair/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Quadtree/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Shrubland/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Ungenerate/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

Collector/Collector.csproj

@@ -11,6 +11,7 @@
     </ItemGroup>
 
     <ItemGroup>
+        <PackageReference Include="MGCB.Linux" Version="3.5.1" />
         <PackageReference Include="MonoGame.Content.Builder" Version="3.7.0.9" />
         <PackageReference Include="MonoGame.Extended" Version="3.7.0" />
         <PackageReference Include="MonoGame.Framework.DesktopGL.Core" Version="3.8.0.13" />

Collector/Content/Content.mgcb

@@ -13,7 +13,7 @@
 
 #---------------------------------- Content ---------------------------------#
 
-#begin air.png
+#begin BlockAir.png
 /importer:TextureImporter
 /processor:TextureProcessor
 /processorParam:ColorKeyColor=255,0,255,255
@@ -23,7 +23,115 @@
 /processorParam:ResizeToPowerOfTwo=False
 /processorParam:MakeSquare=False
 /processorParam:TextureFormat=Color
-/build:air.png
+/build:BlockAir.png
+
+#begin BlockGrass.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockGrass.png
+
+#begin BlockJungleGrass.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockJungleGrass.png
+
+#begin BlockRoof.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockRoof.png
+
+#begin BlockSand.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockSand.png
+
+#begin BlockSnow.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockSnow.png
+
+#begin BlockStone.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockStone.png
+
+#begin BlockWall.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockWall.png
+
+#begin BlockWater.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockWater.png
+
+#begin BlockWood.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/processorParam:ColorKeyColor=255,0,255,255
+/processorParam:ColorKeyEnabled=True
+/processorParam:GenerateMipmaps=False
+/processorParam:PremultiplyAlpha=True
+/processorParam:ResizeToPowerOfTwo=False
+/processorParam:MakeSquare=False
+/processorParam:TextureFormat=Color
+/build:BlockWood.png
 
 #begin crosshair.png
 /importer:TextureImporter
@@ -37,7 +145,7 @@
 /processorParam:TextureFormat=Color
 /build:crosshair.png
 
-#begin grass.png
+#begin man.png
 /importer:TextureImporter
 /processor:TextureProcessor
 /processorParam:ColorKeyColor=255,0,255,255
@@ -47,67 +155,7 @@
 /processorParam:ResizeToPowerOfTwo=False
 /processorParam:MakeSquare=False
 /processorParam:TextureFormat=Color
-/build:grass.png
+/build:man.png
-
-#begin jungleGrass.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:jungleGrass.png
-
-#begin roof.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:roof.png
-
-#begin sand.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:sand.png
-
-#begin snow.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:snow.png
-
-#begin stone.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:stone.png
 
 #begin tree.png
 /importer:TextureImporter
@@ -121,39 +169,3 @@
 /processorParam:TextureFormat=Color
 /build:tree.png
 
-#begin wall.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:wall.png
-
-#begin water.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:water.png
-
-#begin wood.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:ColorKeyColor=255,0,255,255
-/processorParam:ColorKeyEnabled=True
-/processorParam:GenerateMipmaps=False
-/processorParam:PremultiplyAlpha=True
-/processorParam:ResizeToPowerOfTwo=False
-/processorParam:MakeSquare=False
-/processorParam:TextureFormat=Color
-/build:wood.png
-

Collector/Main.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using Collector.Character;
 using Collector.Dimension;
@@ -19,12 +20,15 @@ namespace Collector
         private PlayerMouse _playerMouse;
         private OrthographicCamera _cam;
         private WorldRenderer WorldRenderer { get; set; }
+        public static Dictionary<Blocks, Texture2D> Materials { get; } = new Dictionary<Blocks, Texture2D>();
+
 
         public Main()
         {
             _graphics = new GraphicsDeviceManager(this);
             Content.RootDirectory = "Content";
             IsMouseVisible = true;
+            IsFixedTimeStep = true;
         }
 
         protected override void Initialize()
@@ -32,7 +36,10 @@ namespace Collector
             // TODO: Add your initialization logic here
             base.Initialize();
 
-            BlockMaterials.Initialize(Content);
+            foreach (Blocks name in Enum.GetValues(typeof(Blocks))) 
+            {
+                Materials.Add(name,Content.Load<Texture2D>(name.ToString()));
+            }
             
             var viewportAdapter = new BoxingViewportAdapter(Window, GraphicsDevice, 800, 480);
             _player = new Player(0, 0);
@@ -49,7 +56,6 @@ namespace Collector
         {
             // TODO: Add your update logic here/*
             base.Update(gameTime);
-            
             World.LoadChunks();
             World.UnloadChunks();
         }

Collector/Restrictions.cs

@@ -8,7 +8,7 @@ namespace Collector
         public const int Seed = 1;
         public const float ViewportHeight = 9/2f;
         public const float ViewportWidth = 16/2f; 
-        public const int MovementSpeed = 16;
+        public const int MovementSpeed = 1;
         public const int FreeSpeed = 2;
         public const int KeyDelay = 0;
         public const int TileSize = 32;

Collector/src/Character/InputController.cs

@@ -181,7 +181,7 @@ public class InputController : IRestrictions
         }
         if (mouseState.RightButton == ButtonState.Pressed)
         {
-            Chunks.PlaceBlock(playerMouse.GetSelectedXTile(),playerMouse.GetSelectedYTile(),"wood");
+            Chunks.PlaceBlock(playerMouse.GetSelectedXTile(),playerMouse.GetSelectedYTile(),Blocks.BlockWood);
         }
     }
 

Collector/src/Dimension/Block.cs

@@ -1,8 +0,0 @@
-
-public class Block {
-    public string Name { get; }
-
-    public Block(string name) {
-        Name = name;
-    }
-}

Collector/src/Dimension/BlockMaterials.cs

@@ -1,32 +0,0 @@
-using System.Collections.Generic;
-using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Content;
-using Microsoft.Xna.Framework.Graphics;
-
-namespace Collector.Dimension
-{
-    public static class BlockMaterials {
-        public static readonly Dictionary<string,Block> Materials = new Dictionary<string, Block>();
-        public static readonly Dictionary<string,Texture2D> Textures = new Dictionary<string, Texture2D>();
-
-        //Private so the singleton can't be instantiated
-        static BlockMaterials() {}
-    
-        public static void Initialize(ContentManager content){
-            Materials.Add("grass",new Block("grass"));
-            Materials.Add("wood",new Block("wood"));
-            Materials.Add("water",new Block("water"));
-            Materials.Add("stone",new Block("stone"));
-            Materials.Add("snow",new Block("snow"));
-            Materials.Add("sand",new Block("sand"));
-            Materials.Add("air",new Block("air"));
-            Materials.Add("roof",new Block("roof"));
-            Materials.Add("wall",new Block("wall"));
-
-            foreach (var name in Materials.Keys)
-            {
-                Textures.Add(name,content.Load<Texture2D>(name));
-            }
-        }
-    }
-}

Collector/src/Dimension/Blocks.cs

@@ -0,0 +1,15 @@
+namespace Collector.Dimension
+{
+    public enum Blocks
+    {
+        BlockAir,
+        BlockGrass,
+        BlockWood,
+        BlockStone,
+        BlockSnow,
+        BlockSand,
+        BlockRoof,
+        BlockWall,
+        BlockWater
+    }
+}

Collector/src/Dimension/Chunks.cs

@@ -3,38 +3,39 @@
 using System;
 using System.Collections.Generic;
 using Collector.ThirdPartyCode;
+using Microsoft.Xna.Framework.Graphics;
 
 namespace Collector.Dimension
 {
-    public class Chunks: IRestrictions {
+    public static class Chunks
-        public static Dictionary<Tuple<int, int, int>, Block> LoadedChunks { get; } = new Dictionary<Tuple<int, int, int>, Block>();
+    {
-        private static readonly Dictionary<Tuple<int, int, int>, Block> SavedChunks = new Dictionary<Tuple<int, int, int>, Block>();
+        public static Dictionary<Tuple<int, int, int>, Blocks> LoadedChunks { get; } = new Dictionary<Tuple<int, int, int>, Blocks>();
+        private static readonly Dictionary<Tuple<int, int, int>, Blocks> SavedChunks = new Dictionary<Tuple<int, int, int>, Blocks>();
         
         private static readonly OpenSimplexNoise Gen1 = new OpenSimplexNoise(IRestrictions.Seed+ 1);
         private static readonly OpenSimplexNoise Gen2 = new OpenSimplexNoise(IRestrictions.Seed);
 
         public static void CreateStructures() {
             const int i = 10;
-            SetBlock(3 + i, 2,1,"wall");
+            SetBlock(3 + i, 2,1,Blocks.BlockWall);
-            SetBlock(4 + i, 2,1,"wall");
+            SetBlock(4 + i, 2,1,Blocks.BlockWall);
-            SetBlock(3 + i, 3,1, "roof");
+            SetBlock(3 + i, 3,1, Blocks.BlockRoof);
-            SetBlock(4 + i, 3,1,"roof");
+            SetBlock(4 + i, 3,1,Blocks.BlockRoof);
         }
 
-        private static void SetBlock(int x, int y, int z, string name) {
+        private static void SetBlock(int x, int y, int z, Blocks name)
-            LoadedChunks[new Tuple<int,int,int>(x, y, z)] = BlockMaterials.Materials[name];
+        {
-            SavedChunks[new Tuple<int,int,int>(x, y, z)] = BlockMaterials.Materials[name];
+            LoadedChunks[new Tuple<int, int, int>(x, y, z)] = name;
+            SavedChunks[new Tuple<int,int,int>(x, y, z)] = name;
         }
 
-        public static void PlaceBlock(int x, int y, string name)
+        public static void PlaceBlock(int x, int y, Blocks name)
         {
             var triple = new Tuple<int, int, int>(x, y, 1);
-            if (LoadedChunks.ContainsKey(triple))
+            if (!LoadedChunks.ContainsKey(triple)) return;
+            if (LoadedChunks[triple].Equals(Blocks.BlockAir))
             {
-                if (LoadedChunks[triple].Name.Equals("air"))
+                SetBlock(x, y, 1, name);
-                {
-                    SetBlock(x, y, 1, name);
-                }
             }
         }
 
@@ -42,10 +43,10 @@ namespace Collector.Dimension
             var triple = new Tuple<int, int, int>(x, y, 1);
             
             if (!LoadedChunks.ContainsKey(triple)) return;
-            if (LoadedChunks[triple].Name.Equals("air")) return;
+            if (LoadedChunks[triple].Equals(Blocks.BlockAir)) return;
             
-            LoadedChunks[triple] = BlockMaterials.Materials["air"];
+            LoadedChunks[triple] = Blocks.BlockAir;
-            SavedChunks[triple] = BlockMaterials.Materials["air"];
+            SavedChunks[triple] = Blocks.BlockAir;
         }
 
         public static void UngenerateChunk(int x, int y) {
@@ -99,8 +100,8 @@ namespace Collector.Dimension
             }
         }
 
-        private static Block GetBlocks(int x, int y, int z) {
+        private static Blocks GetBlocks(int x, int y, int z) {
-            return SavedChunks.GetValueOrDefault(new Tuple<int, int, int>(x, y, z), new Block("air"));
+            return SavedChunks.GetValueOrDefault(new Tuple<int, int, int>(x, y, z), Blocks.BlockAir);
         }
 
         private static double Noise1(double nx, double ny) {
@@ -111,7 +112,7 @@ namespace Collector.Dimension
             return Gen2.Evaluate(nx, ny) / 2 + 0.5;
         }
 
-        private static Block GetTerrain(int x, int y) {
+        private static Blocks GetTerrain(int x, int y) {
             const double scale = 0.01;
             var nx = x * scale;
             var ny = y * scale;
@@ -134,26 +135,26 @@ namespace Collector.Dimension
             return GetBiomeBlock(moisture, elevation);
         }
 
-        private static Block GetBiomeBlock(double moisture, double elevation) {
+        private static Blocks GetBiomeBlock(double moisture, double elevation) {
             var biome = GetBiome(moisture, elevation);
-            if (biome.Equals("Tundra")) return BlockMaterials.Materials["snow"];
+            if (biome.Equals("Tundra")) return Blocks.BlockSnow;
-            if (biome.Equals("Taiga")) return BlockMaterials.Materials["snow"];
+            if (biome.Equals("Taiga")) return Blocks.BlockSnow;
-            if (biome.Equals("Snow")) return BlockMaterials.Materials["snow"];
+            if (biome.Equals("Snow")) return Blocks.BlockSnow;
 
-            if (biome.Equals("Grassland")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("Grassland")) return Blocks.BlockGrass;
-            if (biome.Equals("Shrubland")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("Shrubland")) return Blocks.BlockGrass;
-            if (biome.Equals("TemperateDeciduousForest")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("TemperateDeciduousForest")) return Blocks.BlockGrass;
 
-            if (biome.Equals("TemperateRainForest")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("TemperateRainForest")) return Blocks.BlockGrass;
-            if (biome.Equals("TropicalSeasonalForest")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("TropicalSeasonalForest")) return Blocks.BlockGrass;
-            if (biome.Equals("TropicalForest")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("TropicalForest")) return Blocks.BlockGrass;
-            if (biome.Equals("TropicalRainForest")) return BlockMaterials.Materials["grass"];
+            if (biome.Equals("TropicalRainForest")) return Blocks.BlockGrass;
 
-            if (biome.Equals("Beach")) return BlockMaterials.Materials["sand"];
+            if (biome.Equals("Beach")) return Blocks.BlockSand;
-            if (biome.Equals("Bare")) return BlockMaterials.Materials["sand"];
+            if (biome.Equals("Bare")) return Blocks.BlockSand;
-            if (biome.Equals("Scorched")) return BlockMaterials.Materials["sand"];
+            if (biome.Equals("Scorched")) return Blocks.BlockSand;
-            if (biome.Equals("TemperateDesert")) return BlockMaterials.Materials["sand"];
+            if (biome.Equals("TemperateDesert")) return Blocks.BlockSand;
-            return biome.Equals("SubtropicalDesert") ? BlockMaterials.Materials["sand"] : BlockMaterials.Materials["water"];
+            return biome.Equals("SubtropicalDesert") ? Blocks.BlockSand : Blocks.BlockWater;
         }
 
         private static string GetBiome(double moisture, double elevation) {

Collector/src/Dimension/Inventory.cs

@@ -12,10 +12,6 @@ public class Inventory {
         this.inventory = inventory;
     }
     
-    public void AddItem(Block block){
-        inventory.AddFirst((ItemStack) block);
-    }
-
     public void RemoveItem(ItemStack itemStack){
         inventory.Remove(itemStack);
     }

Collector/src/Dimension/ItemStack.cs

@@ -1,11 +1,11 @@
 
 namespace Collector.Dimension
 {
-    public class ItemStack: Block {
+    public class ItemStack {
         int value;
         int quantity;
 
-        public ItemStack(string name, int value, int quantity) : base(name)
+        public ItemStack(Blocks id, int value, int quantity)
         {
             this.value = value;
             this.quantity = quantity;

Collector/src/Dimension/WorldRenderer.cs

@@ -1,7 +1,6 @@
 using System.Linq;
 using Collector.Character;
 using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
 
 namespace Collector.Dimension
@@ -23,10 +22,10 @@ namespace Collector.Dimension
 
         private static void DrawWorld(SpriteBatch batch, int layer)
         {
-            foreach (var chunkpair in Chunks.LoadedChunks.Keys.Where(chunkpair => chunkpair.Item3 == layer))
+            foreach (var chunkpair in Chunks.LoadedChunks.Keys.Where(chunkpair => layer==chunkpair.Item3))
             {
                 batch.Draw(
-                    BlockMaterials.Textures[Chunks.LoadedChunks[chunkpair].Name],
+                    Main.Materials[Chunks.LoadedChunks[chunkpair]],
                     new Rectangle(
                         chunkpair.Item1 << IRestrictions.TileShift,
                         chunkpair.Item2 << IRestrictions.TileShift,
@@ -40,10 +39,11 @@ namespace Collector.Dimension
         public void Draw(GameTime gameTime)
         {
             //Higher means draws in a lower layer
-            DrawWorld(_spriteBatch, 0);
+            DrawWorld(_spriteBatch,0);
+            DrawWorld(_spriteBatch,1);
             _inputController.Draw();
             _inputController.PlayerInput(_main,_playerMouse,gameTime);
-            DrawWorld(_spriteBatch, 1);
+            DrawWorld(_spriteBatch,2);
         }
     }
 }

Collector/src/ThirdPartyCode/QuadTree.cs

@@ -0,0 +1,320 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+//Quadtree code
+//https://github.com/futurechris/QuadTree
+
+namespace QuadTree
+{
+
+    public class QuadTree<T>
+    {
+        private static Stack<Branch> branchPool = new Stack<Branch>();
+        private static Stack<Leaf> leafPool = new Stack<Leaf>();
+
+        private readonly Branch _root;
+        private readonly int _splitCount;
+        private readonly int _depthLimit;
+        private readonly Dictionary<T, Leaf> _leafLookup = new Dictionary<T, Leaf>();
+
+
+        public QuadTree(int splitCount, int depthLimit, ref Quad region)
+        {
+            _splitCount = splitCount;
+			_depthLimit = depthLimit;
+            _root = CreateBranch(this, null, 0, ref region);
+        }
+
+		public QuadTree(int splitCount, int depthLimit, Quad region)
+            : this(splitCount, depthLimit, ref region)
+        {
+
+        }
+
+        public QuadTree(int splitCount, int depthLimit, float x, float y, float width, float height)
+            : this(splitCount, depthLimit, new Quad(x, y, x + width, y + height))
+        {
+
+        }
+
+
+        public void Clear()
+        {
+            _root.Clear();
+            _root.Tree = this;
+            _leafLookup.Clear();
+        }
+
+
+        public static void ClearPools()
+        {
+            branchPool = new Stack<Branch>();
+            leafPool = new Stack<Leaf>();
+        }
+
+
+        private void Insert(T value, ref Quad quad)
+        {
+            if (!_leafLookup.TryGetValue(value, out var leaf))
+            {
+                leaf = CreateLeaf(value, ref quad);
+                _leafLookup.Add(value, leaf);
+            }
+            _root.Insert(leaf);
+        }
+
+        public void Insert(T value, Quad quad)
+        {
+            Insert(value, ref quad);
+        }
+
+        public void Insert(T value, float x, float y, float width, float height)
+        {
+            var quad = new Quad(x, y, x + width, y + height);
+            Insert(value, ref quad);
+        }
+
+        private bool SearchArea(ref Quad quad, ref List<T> values)
+        {
+            if (values != null)
+                values.Clear();
+            else
+                values = new List<T>();
+            _root.SearchQuad(ref quad, values);
+            return values.Count > 0;
+        }
+        
+        public bool SearchArea(Quad quad, ref List<T> values)
+        {
+            return SearchArea(ref quad, ref values);
+        }
+
+        public bool SearchArea(float x, float y, float width, float height, ref List<T> values)
+        {
+            var quad = new Quad(x, y, x + width, y + height);
+            return SearchArea(ref quad, ref values);
+        }
+
+        public bool SearchPoint(float x, float y, ref List<T> values)
+        {
+            if (values != null)
+                values.Clear();
+            else
+                values = new List<T>();
+            _root.SearchPoint(x, y, values);
+            return values.Count > 0;
+        }
+
+        public bool FindCollisions(T value, ref List<T> values)
+        {
+            if (values != null)
+                values.Clear();
+            else
+                values = new List<T>(_leafLookup.Count);
+
+            if (!_leafLookup.TryGetValue(value, out var leaf)) return false;
+            var branch = leaf.Branch;
+
+            //Add the leaf's siblings (prevent it from colliding with itself)
+            if (branch.Leaves.Count > 0)
+                foreach (var t in branch.Leaves)
+                    if (leaf != t && leaf.Quad.Intersects(ref t.Quad))
+                        values.Add(t.Value);
+
+            //Add the branch's children
+            if (branch.Split)
+                for (var i = 0; i < 4; ++i)
+                    if (branch.Branches[i] != null)
+                        branch.Branches[i].SearchQuad(ref leaf.Quad, values);
+
+            //Add all leaves back to the root
+            branch = branch.Parent;
+            while (branch != null)
+            {
+                if (branch.Leaves.Count > 0)
+                    foreach (var t in branch.Leaves)
+                        if (leaf.Quad.Intersects(ref t.Quad))
+                            values.Add(t.Value);
+
+                branch = branch.Parent;
+            }
+            return false;
+        }
+        
+        public int CountBranches()
+        {
+            var count = 0;
+            CountBranches(_root, ref count);
+            return count;
+        }
+
+        private static void CountBranches(Branch branch, ref int count)
+        {
+            ++count;
+            if (!branch.Split) return;
+            for (var i = 0; i < 4; ++i)
+                if (branch.Branches[i] != null)
+                    CountBranches(branch.Branches[i], ref count);
+        }
+
+        private static Branch CreateBranch(QuadTree<T> tree, Branch parent, int branchDepth, ref Quad quad)
+        {
+            var branch = branchPool.Count > 0 ? branchPool.Pop() : new Branch();
+            branch.Tree = tree;
+            branch.Parent = parent;
+            branch.Split = false;
+			branch.Depth = branchDepth;
+            var midX = quad.MinX + (quad.MaxX - quad.MinX) * 0.5f;
+            var midY = quad.MinY + (quad.MaxY - quad.MinY) * 0.5f;
+            branch.Quads[0].Set(quad.MinX, quad.MinY, midX, midY);
+            branch.Quads[1].Set(midX, quad.MinY, quad.MaxX, midY);
+            branch.Quads[2].Set(midX, midY, quad.MaxX, quad.MaxY);
+            branch.Quads[3].Set(quad.MinX, midY, midX, quad.MaxY);
+            return branch;
+        }
+
+        private static Leaf CreateLeaf(T value, ref Quad quad)
+        {
+            var leaf = leafPool.Count > 0 ? leafPool.Pop() : new Leaf();
+            leaf.Value = value;
+            leaf.Quad = quad;
+            return leaf;
+        }
+
+        public class Branch
+        {
+            internal QuadTree<T> Tree;
+            internal Branch Parent;
+            internal readonly Quad[] Quads = new Quad[4];
+            internal readonly Branch[] Branches = new Branch[4];
+            internal readonly List<Leaf> Leaves = new List<Leaf>();
+            internal bool Split;
+			internal int Depth;
+
+            internal void Clear()
+            {
+                Tree = null;
+                Parent = null;
+                Split = false;
+
+                for (var i = 0; i < 4; ++i)
+                {
+                    if (Branches[i] == null) continue;
+                    branchPool.Push(Branches[i]);
+                    Branches[i].Clear();
+                    Branches[i] = null;
+                }
+
+                foreach (var t in Leaves)
+                {
+                    leafPool.Push(t);
+                    t.Branch = null;
+                    t.Value = default;
+                }
+
+                Leaves.Clear();
+            }
+
+            internal void Insert(Leaf leaf)
+            {
+                //If this branch is already split
+                if (Split)
+                {
+                    for (var i = 0; i < 4; ++i)
+                    {
+                        if (!Quads[i].Contains(ref leaf.Quad)) continue;
+                        Branches[i] ??= CreateBranch(Tree, this, Depth + 1, ref Quads[i]);
+                        Branches[i].Insert(leaf);
+                        return;
+                    }
+
+                    Leaves.Add(leaf);
+                    leaf.Branch = this;
+                }
+                else
+                {
+                    //Add the leaf to this node
+                    Leaves.Add(leaf);
+                    leaf.Branch = this;
+
+                    //Once I have reached capacity, split the node
+                    if (Leaves.Count >= Tree._splitCount && Depth < Tree._depthLimit)
+                    {
+                        Split = true;
+                    }
+                }
+            }
+
+            internal void SearchQuad(ref Quad quad, List<T> values)
+            {
+                if (Leaves.Count > 0)
+                    foreach (var t in Leaves)
+                        if (quad.Intersects(ref t.Quad))
+                            values.Add(t.Value);
+
+                for (var i = 0; i < 4; ++i)
+                    if (Branches[i] != null)
+                        Branches[i].SearchQuad(ref quad, values);
+            }
+
+            internal void SearchPoint(float x, float y, List<T> values)
+            {
+                if (Leaves.Count > 0) values.AddRange(from t in Leaves where t.Quad.Contains(x, y) select t.Value);
+
+                for (var i = 0; i < 4; ++i)
+                    if (Branches[i] != null)
+                        Branches[i].SearchPoint(x, y, values);
+            }
+        }
+
+        internal class Leaf
+        {
+            internal Branch Branch;
+            internal T Value;
+            internal Quad Quad;
+        }
+    }
+
+
+    public struct Quad
+    {
+        public float MinX;
+        public float MinY;
+        public float MaxX;
+        public float MaxY;
+        
+        public Quad(float minX, float minY, float maxX, float maxY)
+        {
+            MinX = minX;
+            MinY = minY;
+            MaxX = maxX;
+            MaxY = maxY;
+        }
+        
+        public void Set(float minX, float minY, float maxX, float maxY)
+        {
+            MinX = minX;
+            MinY = minY;
+            MaxX = maxX;
+            MaxY = maxY;
+        }
+
+
+        public bool Intersects(ref Quad other)
+        {
+            return MinX < other.MaxX && MinY < other.MaxY && MaxX > other.MinX && MaxY > other.MinY;
+        }
+
+        public bool Contains(ref Quad other)
+        {
+            return other.MinX >= MinX && other.MinY >= MinY && other.MaxX <= MaxX && other.MaxY <= MaxY;
+        }
+        
+        public bool Contains(float x, float y)
+        {
+            return x > MinX && y > MinY && x < MaxX && y < MaxY;
+        }
+    }
+}
+