add World class & refactor other things appropriately

GitOrigin-RevId: 9e72fe95272da1a8e9d50ffe147ae13742547ed4

Jumpy.Shared/Jumpy.Shared.projitems

@@ -6,7 +6,7 @@
     <SharedGUID>2785994a-a14f-424e-8e77-2e464d28747f</SharedGUID>
   </PropertyGroup>
   <PropertyGroup Label="Configuration">
-    <Import_RootNamespace>Jumpy.Shared</Import_RootNamespace>
+    <Import_RootNamespace>Jumpy</Import_RootNamespace>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Camera.cs" />
@@ -16,5 +16,6 @@
     <Compile Include="$(MSBuildThisFileDirectory)KeyboardInput.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)JumpyGame.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Player.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)World.cs" />
   </ItemGroup>
 </Project>

Jumpy.Shared/JumpyGame.cs

@@ -24,10 +24,12 @@ namespace Jumpy {
     History<GamePadState> gamePad = new History<GamePadState>(2);
 
     FpsCounter fpsCounter = new FpsCounter();
-    Player player;
-    Texture2D grassland;
     Texture2D grasslandBg1;
     Texture2D grasslandBg2;
+    Texture2D whiteTexture;
+
+    Player player;
+    World world;
 
     public JumpyGame() {
       graphics = new GraphicsDeviceManager(this);
@@ -54,10 +56,14 @@ namespace Jumpy {
     protected override void LoadContent() {
       spriteBatch = new SpriteBatch(GraphicsDevice);
       font = Content.Load<SpriteFont>("font");
+      // TODO: decouple things like Player and World from their textures.
       player = new Player(Content.Load<Texture2D>("player_1x"));
-      grassland = Content.Load<Texture2D>("grassland");
+      world = new World(Content.Load<Texture2D>("grassland"));
+      // TODO: move backgrounds into World.
       grasslandBg1 = Content.Load<Texture2D>("grassland_bg1");
       grasslandBg2 = Content.Load<Texture2D>("grassland_bg2");
+      whiteTexture = new Texture2D(GraphicsDevice, 1, 1);
+      whiteTexture.SetData(new Color[] { Color.White });
     }
 
     // Called once per game. Unloads all game content.
@@ -85,6 +91,21 @@ namespace Jumpy {
       base.Update(gameTime);
     }
 
+    private void DrawRect(SpriteBatch spriteBatch, Rectangle rect, Color color) {
+      // top side
+      spriteBatch.Draw(
+        whiteTexture, new Rectangle(rect.Left, rect.Top, rect.Width, 1), color);
+      // bottom side
+      spriteBatch.Draw(
+        whiteTexture, new Rectangle(rect.Left, rect.Bottom - 1, rect.Width, 1), color);
+      // left side
+      spriteBatch.Draw(
+        whiteTexture, new Rectangle(rect.Left, rect.Top, 1, rect.Height), color);
+      // right side
+      spriteBatch.Draw(
+        whiteTexture, new Rectangle(rect.Right - 1, rect.Top, 1, rect.Height), color);
+    }
+
     // Called when the game should draw itself.
     protected override void Draw(GameTime gameTime) {
       // We need to update the FPS counter in Draw() since Update() might get called more
@@ -99,7 +120,8 @@ namespace Jumpy {
       spriteBatch.Begin();
 
       // Draw background.
-      Rectangle bgSource = new Rectangle(0, grasslandBg1.Height - Camera.Height, Camera.Width, Camera.Height);
+      Rectangle bgSource = new Rectangle(
+        0, grasslandBg1.Height - Camera.Height, Camera.Width, Camera.Height);
       Rectangle bgTarget = new Rectangle(0, 0, Camera.Width, Camera.Height);
       spriteBatch.Draw(grasslandBg2, bgTarget, bgSource, Color.White);
       spriteBatch.Draw(grasslandBg1, bgTarget, bgSource, Color.White);
@@ -108,17 +130,7 @@ namespace Jumpy {
       player.Draw(gameTime, spriteBatch);
 
       // Draw foreground tiles.
-      int size = 16;
+      world.Draw(spriteBatch);
-      for (int i = 0; i < Camera.Width / size; i++) {
-        Rectangle source = new Rectangle(3 * size, 0 * size, size, size);
-        Vector2 drawPos = new Vector2(i * size, Camera.Height - size * 2);
-        spriteBatch.Draw(grassland, drawPos, source, Color.White);
-      }
-      for (int i = 0; i < Camera.Width / size; i++) {
-        Rectangle source = new Rectangle(3 * size, 1 * size, size, size);
-        Vector2 drawPos = new Vector2(i * size, Camera.Height - size);
-        spriteBatch.Draw(grassland, drawPos, source, Color.White);
-      }
 
       // Aaaaand we're done.
       spriteBatch.End();

Jumpy.Shared/Player.cs

@@ -12,7 +12,7 @@ namespace Jumpy {
     private Texture2D texture;
     private const int spriteSize = 48;
     private const int spriteWidth = 7;
-    private const int bottomPadding = 5;
+    private const int bottomPadding = 1;
     private const int moveSpeed = 200;
     private const int jumpSpeed = 600;
     private const int gravity = 2000;

Jumpy.Shared/World.cs

@@ -0,0 +1,88 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using System.Collections.Generic;
+
+namespace Jumpy {
+  enum Terrain {
+    Empty,
+    Grass,
+    Rock
+  }
+
+  class Tile {
+    Texture2D texture;
+    Terrain terrain;
+    Rectangle position;
+
+    public Tile(Texture2D texture, Terrain terrain, Rectangle position) {
+      this.texture = texture;
+      this.terrain = terrain;
+      this.position = position;
+    }
+
+    public Rectangle Position { get; }
+    public Terrain Terrain { get; }
+
+    public void Draw(SpriteBatch spriteBatch) {
+      int size = World.TileSize;
+      switch (terrain) {
+        case Terrain.Grass: {
+          // TODO: hold these rectangles statically instead of making them anew constantly.
+          Rectangle source = new Rectangle(3 * size, 0 * size, size, size);
+          spriteBatch.Draw(texture, position, source, Color.White);
+          break;
+        }
+        case Terrain.Rock: {
+          Rectangle source = new Rectangle(3 * size, 1 * size, size, size);
+          spriteBatch.Draw(texture, position, source, Color.White);
+          break;
+        }
+        case Terrain.Empty:
+        default:
+          break;
+      }
+    }
+  }
+
+  class World {
+
+    public const int TileSize = 16;
+    int width;
+    int height;
+    Tile[,] tiles;
+
+    public int Width { get; }
+    public int Height { get; }
+
+    public World(Texture2D texture) {
+      width = Camera.Width / TileSize;
+      height = Camera.Height / TileSize + 1;
+      tiles = new Tile[width, height];
+      for (int j = 0; j < height; j++) {
+        for (int i = 0; i < width; i++) {
+          Terrain terrain;
+          if (j < height - 3) {
+            terrain = Terrain.Empty;
+          } else if (j == height - 3) {
+            terrain = Terrain.Grass;
+          } else {
+            terrain = Terrain.Rock;
+          }
+          if (j == 4 && 11 < i && i < 15) {
+            terrain = Terrain.Grass;
+          }
+          var position = new Rectangle(i * TileSize, j * TileSize, TileSize, TileSize);
+          tiles[i, j] = new Tile(texture, terrain, position);
+        }
+      }
+    }
+
+    public void Draw(SpriteBatch spriteBatch) {
+      for (int j = 0; j < height; j++) {
+        for (int i = 0; i < width; i++) {
+          tiles[i, j].Draw(spriteBatch);
+        }
+      }
+    }
+  }
+}