Created a world, added the ball to the world, body constraints missing

core/src/com/mygdx/game/GameScreens/GameIntro.java

@@ -18,18 +18,14 @@ import java.util.Date;
 public class GameIntro extends GameScreen
 {
     BitmapFont bf = new BitmapFont();
-    long creationDate;
 
     Texture intro;
 
     String s;
 
     @Override
-    public void buildStage() {
-        /*Label l = new Label("Intro screen", FontManager.getInstance().getLabelStyle(Color.BLACK));
-        l.setPosition(50, 50);
-        addActor(l);*/
-        creationDate = System.currentTimeMillis();
+    public void buildStage()
+    {
         bf.setColor(Color.RED);
 
         intro = new Texture(Gdx.files.internal("images/Intro.jpg"));
@@ -42,7 +38,7 @@ public class GameIntro extends GameScreen
 
         batch.draw(intro, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
 
-        if(System.currentTimeMillis() - creationDate > 2000)
+        if(System.currentTimeMillis() - creationDate > 3000)
         {
             // Intro screen is over
             GameScreenManager.getInstance().showGameScreen(GameScreenEnum.GAME_MENU);

core/src/com/mygdx/game/GameScreens/GameMenu.java

@@ -24,6 +24,11 @@ public class GameMenu extends GameScreen
 
         batch.draw(menu, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
 
+        if(totalElapsedSeconds() > 3)
+        {
+            GameScreenManager.getInstance().showGameScreen(GameScreenEnum.GAME_PLAY);
+        }
+
         super.render(delta);
     }
 }

core/src/com/mygdx/game/GameScreens/GamePlay.java

@@ -3,6 +3,18 @@ package com.mygdx.game.GameScreens;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.math.Shape2D;
+import com.badlogic.gdx.math.Vector2;
+import com.badlogic.gdx.physics.box2d.Body;
+import com.badlogic.gdx.physics.box2d.BodyDef;
+import com.badlogic.gdx.physics.box2d.Box2D;
+import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer;
+import com.badlogic.gdx.physics.box2d.CircleShape;
+import com.badlogic.gdx.physics.box2d.Fixture;
+import com.badlogic.gdx.physics.box2d.FixtureDef;
+import com.badlogic.gdx.physics.box2d.Shape;
+import com.badlogic.gdx.physics.box2d.World;
 
 /**
  * Gameplay screen, allowing the user to play against an IA or another player on a shared screen
@@ -10,14 +22,62 @@ import com.badlogic.gdx.graphics.g2d.SpriteBatch;
  */
 public class GamePlay extends GameScreen
 {
+    Texture game_field, pad_left, pad_right, goal_left, goal_right, player_left, player_right, ball;
+    World world;
+    Body b_ball;
+
+    Box2DDebugRenderer b2dd;
+
     @Override
-    public void buildStage() {
+    public void buildStage()
+    {
+        game_field = new Texture(Gdx.files.internal("images/Terrain.png"));
+        pad_left = new Texture(Gdx.files.internal("images/Pad.png"));
+        pad_right = new Texture(Gdx.files.internal("images/Pad.png"));
+        goal_left = new Texture(Gdx.files.internal("images/But.bmp"));
+        goal_right = new Texture(Gdx.files.internal("images/But.bmp"));
+        player_left = new Texture(Gdx.files.internal("images/JoueurGauche.png"));
+        player_right = new Texture(Gdx.files.internal("images/JoueurDroite.png"));
+        ball = new Texture(Gdx.files.internal("images/Ballon.png"));
+
+        world = new World(new Vector2(0, 0), true);
+
+        BodyDef bd_ball = new BodyDef();
+        bd_ball.type = BodyDef.BodyType.DynamicBody;
+        bd_ball.position.set(width()/2, height()/2);
+
+        b_ball = world.createBody(bd_ball);
+
+        FixtureDef fd_ball = new FixtureDef();
+        fd_ball.shape = new CircleShape();
+        fd_ball.shape.setRadius((1/85f) * width());
+
+        Fixture f = b_ball.createFixture(fd_ball);
+
+        b2dd = new Box2DDebugRenderer();
     }
 
     @Override
     public void render(float delta) {
         beforeRender();
 
+        batch.draw(game_field, width()*0.1f, 0, width()*0.8f, height());
+
+        batch.draw(ball, b_ball.getPosition().x, b_ball.getPosition().y, (1/85f)*width(), (1/85f)*width());
+        //b2dd.render(world, getCamera().combined);
+
+        world.step(delta, 1, 1);
+
         super.render(delta);
     }
+
+    private float width()
+    {
+        return Gdx.graphics.getWidth();
+    }
+
+    private float height()
+    {
+        return Gdx.graphics.getHeight();
+    }
 }

core/src/com/mygdx/game/GameScreens/GameScreen.java

@@ -15,9 +15,11 @@ public abstract class GameScreen extends Stage implements Screen
 {
 
     SpriteBatch batch = new SpriteBatch();
+    long creationDate;
 
     protected GameScreen() {
-        super( new StretchViewport(320.0f, 240.0f, new OrthographicCamera()) );
+        super( new StretchViewport(102.4f, 76.8f, new OrthographicCamera()) );
+        creationDate = System.currentTimeMillis();
     }
 
     /**
@@ -55,4 +57,9 @@ public abstract class GameScreen extends Stage implements Screen
     @Override public void hide() {}
     @Override public void pause() {}
     @Override public void resume() {}
+
+    public long totalElapsedSeconds()
+    {
+        return (System.currentTimeMillis() - creationDate) / 1000;
+    }
 }