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--- youtube:monogame-ball [2024/02/28 18:26] – 削除 - 外部編集 (不明な日付) 127.0.0.1
+++ youtube:monogame-ball [2024/02/28 18:36] (現在) – freemikan
@@ 行 1: / 行 1: @@
+====== 画面を跳ね回るボール ======
+{{:youtube:monogame-myballgame.png|}}
+===== Game1.cs =====
+<file csharp>
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+namespace MyBallGame;
+public class Game1 : Game
+{
+    private GraphicsDeviceManager _graphics;
+    private SpriteBatch _spriteBatch;
+    private Ball _ball;
+    const int GAME_WIDTH = 320;
+    const int GAME_HEIGHT = 480;
+    public Game1()
+    {
+        _graphics = new GraphicsDeviceManager(this);
+        Content.RootDirectory = "Content";
+        IsMouseVisible = true;
+        _graphics.PreferredBackBufferWidth = GAME_WIDTH;
+        _graphics.PreferredBackBufferHeight = GAME_HEIGHT;
+        _graphics.ApplyChanges();
+    }
+    protected override void Initialize()
+    {
+        // TODO: Add your initialization logic here
+        base.Initialize();
+    }
+    protected override void LoadContent()
+    {
+        _spriteBatch = new SpriteBatch(GraphicsDevice);
+        var ballTexture = Content.Load<Texture2D>("Circle");
+        var ballRadius = ballTexture.Width / 2.0f;
+        var ballPosition = new Vector2(GAME_WIDTH / 2.0f - ballRadius, GAME_HEIGHT / 2.0f - ballRadius);
+        var ballVelocity = new Vector2(300.0f, 300.0f);
+        _ball = new Ball(ballPosition, ballRadius, ballVelocity, ballTexture);
+    }
+    protected override void Update(GameTime gameTime)
+    {
+        if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
+            Exit();
+        _ball.Update(gameTime, GAME_WIDTH, GAME_HEIGHT);
+        base.Update(gameTime);
+    }
+    protected override void Draw(GameTime gameTime)
+    {
+        GraphicsDevice.Clear(Color.CornflowerBlue);
+        _spriteBatch.Begin();
+        _ball.Draw(_spriteBatch);
+        _spriteBatch.End();
+        base.Draw(gameTime);
+    }
+}
+class Ball
+{
+    private Vector2 _position;
+    private float _radius;
+    private Vector2 _velocity;
+    private Texture2D _texture;
+    public Ball(Vector2 position, float radius, Vector2 velocity, Texture2D texture)
+    {
+        _position = position;
+        _radius = radius;
+        _velocity = velocity;
+        _texture = texture;
+    }
+    public void Update(GameTime gameTime, int gameWidth, int gameHeight)
+    {
+        float deltaTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
+        _position = _position + _velocity * deltaTime;
+        if (_position.X <= 0.0f || _position.X + _radius * 2.0f >= gameWidth)
+        {
+            _velocity.X *= -1.0f;
+        }
+        if (_position.Y <= 0.0f || _position.Y + _radius * 2.0f >= gameHeight)
+        {
+            _velocity.Y *= -1.0f;
+        }
+    }
+    public void Draw(SpriteBatch spriteBatch)
+    {
+        spriteBatch.Draw(_texture, _position, Color.Green);
+    }
+}
+</file>
+===== Program.cs =====
+<file csharp>
+using var game = new MyBallGame.Game1();
+game.Run();
+</file>