feat(game): use Stage & Table to render the UI.

app/src/main/java/org/vibecoders/moongazer/Game.java

@@ -1,8 +1,11 @@
 package org.vibecoders.moongazer;
 
 import com.badlogic.gdx.ApplicationAdapter;
-import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.scenes.scene2d.Stage;
+import com.badlogic.gdx.scenes.scene2d.ui.Table;
+import com.badlogic.gdx.utils.viewport.ScreenViewport;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -14,7 +17,10 @@ public class Game extends ApplicationAdapter {
     public static State state = State.INTRO;
     public static Transition transition = null;
     SpriteBatch batch;
-    Texture logo;
+    // UI stage
+    public Stage stage;
+    public Table root;
+    // Scenes
     Scene currentScene;
     Scene introScene;
     public static Scene mainMenuScene;
@@ -25,7 +31,14 @@ public class Game extends ApplicationAdapter {
         Assets.loadIntroAndWait();
         log.info("Intro assets loaded successfully.");
         batch = new SpriteBatch();
-        currentScene = introScene = new Intro();
+        // Stage for UI elements
+        stage = new Stage(new ScreenViewport(), batch);
+        Gdx.input.setInputProcessor(stage);
+        root = new Table();
+        root.setFillParent(true);
+        stage.addActor(root);
+        // Scene initialization
+        currentScene = introScene = new Intro(this);
         // By the end of the intro, the main menu scene will be created and assigned to Game.mainMenuScene
     }
 
@@ -36,6 +49,9 @@ public class Game extends ApplicationAdapter {
             batch.begin();
             transition.render(batch);
             batch.end();
+            // Handle stage drawing for UI elements
+            stage.act(Gdx.graphics.getDeltaTime());
+            stage.draw();
             return;
         }
         switch (Game.state) {
@@ -54,6 +70,9 @@ public class Game extends ApplicationAdapter {
         batch.begin();
         currentScene.render(batch);
         batch.end();
+        // Handle stage drawing for UI elements
+        stage.act(Gdx.graphics.getDeltaTime());
+        stage.draw();
     }
 
     @Override
@@ -61,6 +80,8 @@ public class Game extends ApplicationAdapter {
         introScene.dispose();
         mainMenuScene.dispose();
         Assets.dispose();
+        batch.dispose();
+        stage.dispose();
         log.debug("Resources disposed");
     }
 }

app/src/main/java/org/vibecoders/moongazer/scenes/Intro.java

@@ -16,13 +16,15 @@ import com.badlogic.gdx.utils.ScreenUtils;
  */
 public class Intro extends Scene {
     private Texture logo;
+    private Game game;
     private long startTime;
     private long endTime = 0;
 
     /**
      * Initializes the intro scene, starts loading assets.
      */
-    public Intro() {
+    public Intro(Game game) {
+        this.game = game;
         logo = Assets.getAsset("icons/logo.png", Texture.class);
         startTime = System.currentTimeMillis() + 500;
         log.info("Starting to load all remaining assets...");
@@ -38,7 +40,7 @@ public class Intro extends Scene {
         if (System.currentTimeMillis() > endTime + 2000 && endTime != 0) {
             if (Game.transition == null) {
                 Assets.waitUntilLoaded();
-                Game.mainMenuScene = new MainMenu();
+                Game.mainMenuScene = new MainMenu(game);
                 Game.transition = new Transition(this, Game.mainMenuScene, State.MAIN_MENU, 1000);
             }
             batch.draw(TEXTURE_BLACK, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);

app/src/main/java/org/vibecoders/moongazer/scenes/MainMenu.java

@@ -3,6 +3,7 @@ package org.vibecoders.moongazer.scenes;
 import static org.vibecoders.moongazer.Constants.*;
 
 import org.vibecoders.moongazer.managers.Assets;
+import org.vibecoders.moongazer.Game;
 
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
@@ -15,11 +16,12 @@ import com.badlogic.gdx.scenes.scene2d.ui.Label.LabelStyle;
 public class MainMenu extends Scene {
     Label textLabel;
 
-    public MainMenu() {
-        super();
+    public MainMenu(Game game) {
+        super(game);
         var font = Assets.getFont("ui", 24);
         textLabel = new Label("Moongazer", new LabelStyle(font, Color.BLACK));
         textLabel.setPosition(WINDOW_WIDTH / 2f - textLabel.getWidth() / 2f, WINDOW_HEIGHT / 2f - textLabel.getHeight() / 2f);
+        game.root.addActor(textLabel);
     }
     /**
      * Renders the main menu scene.
@@ -28,6 +30,7 @@ public class MainMenu extends Scene {
     @Override
     public void render(SpriteBatch batch) {
         batch.draw(TEXTURE_WHITE, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
-        textLabel.draw(batch, 1.0f);
+        // Unneeded as using Scene2D Stage to render the label
+        // textLabel.draw(batch, 1.0f);
     }
 }

app/src/main/java/org/vibecoders/moongazer/scenes/Scene.java

@@ -1,12 +1,16 @@
 package org.vibecoders.moongazer.scenes;
 
 import org.slf4j.Logger;
+import org.vibecoders.moongazer.Game;
 import org.vibecoders.moongazer.managers.Assets;
 
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 
 public abstract class Scene {
     protected final Logger log = org.slf4j.LoggerFactory.getLogger(getClass());
+    public Scene(Game game) {
+        this();
+    }
     public Scene() {
         if (!Assets.isLoadedAll() && Assets.isStartLoadAll()) {
             Assets.waitUntilLoaded();