add some shots (pew pew pew)

Shared/ShmupScene.cs

@@ -8,7 +8,7 @@ namespace SemiColinGames {
 
     const float DESIRED_ASPECT_RATIO = 1920.0f / 1080.0f;
 
-    private readonly Color backgroundColor = Color.Black;
+    private readonly Color backgroundColor = Color.DarkBlue;
 
     private readonly GraphicsDevice graphics;
     private readonly RenderTarget2D sceneTarget;
@@ -36,7 +36,7 @@ namespace SemiColinGames {
     public void Draw(bool isRunningSlowly, IWorld iworld, bool paused) {
       ShmupWorld world = (ShmupWorld) iworld;
       graphics.SetRenderTarget(null);
-      graphics.Clear(backgroundColor);
+      graphics.Clear(Color.Black);
 
       // Draw scene to sceneTarget.
       graphics.SetRenderTarget(sceneTarget);
@@ -51,6 +51,15 @@ namespace SemiColinGames {
       Vector2 spriteCenter = new Vector2(playerTexture.Width / 2, playerTexture.Height / 2);
       Vector2 drawPos = Vector2.Floor(Vector2.Subtract(world.Player.Position, spriteCenter));
       spriteBatch.Draw(playerTexture, drawPos, Color.White);
+
+      // Draw shots.
+      foreach (ShmupWorld.Shot s in world.Shots) {
+        Texture2D texture = s.Texture.Get;
+        Vector2 center = new Vector2(texture.Width / 2, texture.Height / 2);
+        spriteBatch.Draw(texture, Vector2.Floor(Vector2.Subtract(s.Position, center)), Color.White);
+      }
+
+      // Finish drawing sprites.
       spriteBatch.End();
 
       // Get ready to draw sceneTarget to screen.

Shared/ShmupWorld.cs

@@ -8,16 +8,34 @@ namespace SemiColinGames {
     public class ShmupPlayer {
       public TextureRef Texture = Textures.Yellow2;
       // Center of player sprite.
-      public Vector2 Position = new Vector2(32, 1080 / 8);
+      public Vector2 Position = new Vector2(48, 1080 / 8);
       public Vector2 HalfSize = new Vector2(16, 10);
+      public float Speed = 150f;
+    }
+
+    public class Shot {
+      public TextureRef Texture = Textures.Projectile1;
+      public Vector2 Position;
+      public Vector2 HalfSize = new Vector2(11, 8);
+      public Vector2 Velocity;
+      public Shot(Vector2 position, Vector2 velocity) {
+        Position = position;
+        Velocity = velocity;
+      }
     }
 
     public readonly Point Size;
     public readonly ShmupPlayer Player;
+    public readonly ProfilingList<Shot> Shots;
 
     public ShmupWorld() {
       Size = new Point(1920 / 4, 1080 / 4);
       Player = new ShmupPlayer();
+      Shots = new ProfilingList<Shot>(100, "shots");
+      Vector2 velocity = new Vector2(100, 0);
+      Shots.Add(new Shot(new Vector2(96, 1080 / 8), velocity));
+      Shots.Add(new Shot(new Vector2(96 * 2, 1080 / 8), velocity));
+      Shots.Add(new Shot(new Vector2(96 * 4, 1080 / 8), velocity));
     }
 
     ~ShmupWorld() {
@@ -29,14 +47,22 @@ namespace SemiColinGames {
     }
 
     public void Update(float modelTime, History<Input> input) {
-      float speed = 150f;
-      Vector2 motion = Vector2.Multiply(input[0].Motion, modelTime * speed);
+      Vector2 motion = Vector2.Multiply(input[0].Motion, modelTime * Player.Speed);
       Player.Position = Vector2.Add(Player.Position, motion);
       Player.Position.X = Math.Max(Player.Position.X, Player.HalfSize.X);
       Player.Position.X = Math.Min(Player.Position.X, Size.X - Player.HalfSize.X);
       Player.Position.Y = Math.Max(Player.Position.Y, Player.HalfSize.Y);
       Player.Position.Y = Math.Min(Player.Position.Y, Size.Y - Player.HalfSize.Y);
 
+      foreach (Shot shot in Shots) {
+        shot.Position = Vector2.Add(shot.Position, Vector2.Multiply(shot.Velocity, modelTime));
+        shot.Position.X = Math.Max(shot.Position.X, shot.HalfSize.X);
+        shot.Position.X = Math.Min(shot.Position.X, Size.X - shot.HalfSize.X);
+        shot.Position.X = Math.Max(shot.Position.X, shot.HalfSize.X);
+        shot.Position.X = Math.Min(shot.Position.X, Size.X - shot.HalfSize.X);
+      }
+
+      // Shots.RemoveAll(shot => shot.Position.X > Size.X);
     }
   }
 }