feat: primeira versao funcional do jogo

Author: GustavoLR548

src/main/java/com/gustavolr/engine/entity/Entity.java

@@ -1,6 +1,7 @@
 package com.gustavolr.engine.entity;
 
 import java.awt.Graphics;
+import java.awt.Rectangle;
 
 public abstract class Entity {
 
@@ -40,4 +41,12 @@ public void update() {
     public void render(Graphics g) {
 
     }
+
+	public boolean isColidding(Entity e1) {
+		
+		Rectangle e1Mask = new Rectangle(e1.position.x, e1.position.y, e1.width, e1.height);
+		Rectangle e2Mask = new Rectangle(this.position.x, this.position.y, this.width, this.height);
+		
+		return e1Mask.intersects(e2Mask);
+	}
 }

src/main/java/com/gustavolr/game_entities/Ball.java

@@ -5,13 +5,14 @@
 
 import com.gustavolr.engine.entity.Entity;
 import com.gustavolr.engine.entity.Vector;
-import com.gustavolr.listeners.BallListener;
+import com.gustavolr.engine.window.GameWindow;
+import com.gustavolr.listeners.BallMovedListener;
 
 public class Ball extends Entity {
 
     private int speed;
     private Color color;
-    private BallListener listener;
+    private BallMovedListener listener;
 
     float dx = 1;
     float dy = 1;
@@ -21,16 +22,23 @@ public Ball(Vector position, int width, int height) {
         speed = 1;
     }
 
-    public void addListener(BallListener b) {
+    public void addListener(BallMovedListener b) {
         this.listener = b;
     }
 
+    public void ballCollidedWithPaddle() {
+        dx *= -1;
+    }
+
     @Override
     public void update() {
 
         position.x += dx * speed;
         position.y += dy * speed;
 
+        if(position.y < 0 || position.y > GameWindow.getWindowHeight())
+            dy *= -1;
+
         if (listener != null) {
             this.listener.ballMoved(position);
         }

src/main/java/com/gustavolr/game_entities/Enemy.java

@@ -5,17 +5,17 @@
 
 import com.gustavolr.engine.entity.Entity;
 import com.gustavolr.engine.entity.Vector;
-import com.gustavolr.listeners.BallListener;
+import com.gustavolr.listeners.BallMovedListener;
 
-public class Enemy extends Entity implements BallListener {
+public class Enemy extends Entity implements BallMovedListener {
 
     private int speed = 1;
     private Color color = Color.RED;
 
     public Enemy(Vector position, int width, int height) {
         super(position, width, height);
     }
-    
+
     @Override
     public void render(Graphics g) {
         g.setColor(this.color);

src/main/java/com/gustavolr/game_scenes/MainScene.java

@@ -35,6 +35,12 @@ public void update() {
         for( Entity e : entities) {
             e.update();
         }
+
+        if (b.isColidding(e)) {
+            b.ballCollidedWithPaddle();
+        } else if(b.isColidding(p)) {
+            b.ballCollidedWithPaddle();
+        }
     }   
 
     @Override

…om/gustavolr/listeners/BallListener.java …stavolr/listeners/BallMovedListener.javasrc/main/java/com/gustavolr/listeners/BallListener.java renamed to src/main/java/com/gustavolr/listeners/BallMovedListener.java src/main/java/com/gustavolr/listeners/BallListener.java renamed to src/main/java/com/gustavolr/listeners/BallMovedListener.java

@@ -2,6 +2,6 @@
 
 import com.gustavolr.engine.entity.Vector;
 
-public interface BallListener {
+public interface BallMovedListener {
     public void ballMoved(Vector ballPosition);
 }