Entities verwalten sich jetzt ein Stück weit selbst.

src/de/teamteamteam/spacescooter/Main.java

@@ -2,6 +2,8 @@ package de.teamteamteam.spacescooter;
 
 import java.awt.EventQueue;
 
+import de.teamteamteam.spacescooter.entities.Player;
+import de.teamteamteam.spacescooter.entities.TestEntity;
 import de.teamteamteam.spacescooter.gui.GameFrame;
 import de.teamteamteam.spacescooter.threads.PaintThread;
 import de.teamteamteam.spacescooter.threads.EntityUpdateThread;
@@ -27,6 +29,10 @@ public class Main {
 			}
 		});
 		
+		//Whatever.
+		new TestEntity();
+		new Player();
+		
 		//Initialize PaintThread
 		PaintThread pt = new PaintThread(gf);
 		pt.start();

src/de/teamteamteam/spacescooter/entities/Entity.java

@@ -1,9 +1,27 @@
 package de.teamteamteam.spacescooter.entities;
 
 import java.awt.Graphics;
+import java.util.ArrayList;
 
 public abstract class Entity {
-		
+	
+	public static ArrayList<Entity> entities = null;
+	
+	/**
+	 * We need to initialize the ArrayList, so the EntityUpdateThread won't beat us.
+	 */
+	static {
+		Entity.entities = new ArrayList<Entity>();
+	}
+
+	/**
+	 * Constructor.
+	 * All entities are within a static array list for our convenience.
+	 */
+	public Entity() {
+		Entity.entities.add(this);
+	}
+	
 	public abstract void update();
 
 	public abstract void paint(Graphics g);

src/de/teamteamteam/spacescooter/entities/Player.java

@@ -4,7 +4,6 @@ import java.awt.Graphics;
 import java.awt.event.KeyEvent;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
-import java.io.InputStream;
 
 import javax.imageio.ImageIO;
 
@@ -19,11 +18,7 @@ public class Player extends Entity {
 	
 	static {
 		try {
-			InputStream res = Player.class.getClassLoader().getResourceAsStream("images/nyancat.png");
-			if(res == null) {
-				System.out.println("Kein res :/");
-			}
-			img = ImageIO.read(res);
+			img = ImageIO.read(Player.class.getClassLoader().getResourceAsStream("images/nyancat.png"));
 		} catch (IOException e) {
 			// TODO Auto-generated catch block
 			e.printStackTrace();
@@ -31,6 +26,7 @@ public class Player extends Entity {
 	}
 	
 	public Player() {
+		super();
 		this.x = 200;
 		this.y = 300;
 	}
@@ -38,16 +34,16 @@ public class Player extends Entity {
 	@Override
 	public void update() {
 		if(Keyboard.isKeyDown(KeyEvent.VK_UP)) {
-			this.y--;
+			this.y -= 3;
 		}
 		if(Keyboard.isKeyDown(KeyEvent.VK_DOWN)) {
-			this.y++;
+			this.y += 3;
 		}
 		if(Keyboard.isKeyDown(KeyEvent.VK_LEFT)) {
-			this.x--;
+			this.x -= 3;
 		}
 		if(Keyboard.isKeyDown(KeyEvent.VK_RIGHT)) {
-			this.x++;
+			this.x += 3;
 		}
 
 	}

src/de/teamteamteam/spacescooter/gui/GameFrame.java

@@ -1,36 +1,25 @@
 package de.teamteamteam.spacescooter.gui;
 
 import java.awt.Graphics;
-import java.util.ArrayList;
+import java.awt.image.BufferStrategy;
 import java.util.Iterator;
 
 import javax.swing.JFrame;
 
 import de.teamteamteam.spacescooter.controls.Keyboard;
 import de.teamteamteam.spacescooter.entities.Entity;
-import de.teamteamteam.spacescooter.entities.Player;
-import de.teamteamteam.spacescooter.entities.TestEntity;
 
 /**
  * The game will take place in this beautiful window.
  */
 public class GameFrame extends JFrame {
 
-	private ArrayList<Entity> entities;
-	
+	private static final long serialVersionUID = 1L;
+
 	public GameFrame() {
 		super();
-		this.entities = new ArrayList<Entity>();
-		
-		//TODO: Remove this!
-		this.entities.add(new TestEntity());
-		this.entities.add(new Player());
 	}
-	
-	public ArrayList<Entity> getEntityList() {
-		return this.entities;
-	}
-	
+
 	/**
 	 * Set up the GameFrame before showing it to the world.
 	 */
@@ -39,25 +28,40 @@ public class GameFrame extends JFrame {
 		this.setSize(800, 600);
 		this.setUndecorated(false);
 		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
-		
-		//Make sure we get the keyboard events. Use Keyboard.isKeyDown() to ask about keys status.
+
+		// Make sure we get the keyboard events. Use Keyboard.isKeyDown() to ask
+		// about keys status.
 		this.addKeyListener(new Keyboard());
-		
+
 		this.setVisible(true);
 	}
-	
+
 	/**
-	 * Have the GameFrame repaint all the visible entities.
+	 * The pain, do not underestimate it!
+	 * @see http://content.gpwiki.org/index.php/Java:Tutorials:Double_Buffering for details.
 	 */
-	@Override
-	public void paint(Graphics g) {
-		Iterator<Entity> i = this.entities.iterator();
-		while(i.hasNext()) {
-			Entity e = i.next();
-			e.paint(g);
+	public void drawEntities() {
+		this.createBufferStrategy(2);
+		Graphics bufferedGraphics = null;
+		BufferStrategy bufferStrategy = this.getBufferStrategy();
+		if (bufferStrategy == null) {
+			System.out.println("Mist");
 		}
+		try {
+			bufferedGraphics = bufferStrategy.getDrawGraphics();
+
+			//Now we can use bufferedGraphics to actually draw stuff ...
+			Iterator<Entity> i = Entity.entities.iterator();
+			while (i.hasNext()) {
+				Entity e = i.next();
+				e.paint(bufferedGraphics);
+			}
+		} finally {
+			//We are done, dispose the pen and celebrate the result!
+			if (bufferedGraphics != null) bufferedGraphics.dispose();
+		}
+
+		bufferStrategy.show();
 	}
-	
-	
-	
+
 }

src/de/teamteamteam/spacescooter/threads/EntityUpdateThread.java

@@ -1,9 +1,7 @@
 package de.teamteamteam.spacescooter.threads;
 
-import java.util.ArrayList;
 import java.util.Iterator;
 
-
 import de.teamteamteam.spacescooter.entities.Entity;
 import de.teamteamteam.spacescooter.gui.GameFrame;
 
@@ -31,8 +29,7 @@ public class EntityUpdateThread extends Thread {
 	}
 	
 	private void updateEntities() {
-		ArrayList<Entity> entityList = this.gf.getEntityList();
-		Iterator<Entity> i = entityList.iterator();
+		Iterator<Entity> i = Entity.entities.iterator();
 		while(i.hasNext()) {
 			Entity e = i.next();
 			e.update();

src/de/teamteamteam/spacescooter/threads/PaintThread.java

@@ -1,7 +1,12 @@
 package de.teamteamteam.spacescooter.threads;
 
+import java.awt.EventQueue;
+
 import de.teamteamteam.spacescooter.gui.GameFrame;
 
+/**
+ * This thread triggers about 60 redraws per second.
+ */
 public class PaintThread extends Thread {
 
 	private GameFrame gf;
@@ -11,13 +16,19 @@ public class PaintThread extends Thread {
 	}
 
 	public void run() {
+		final GameFrame gf = this.gf; // :'-(
 		while (true) {
 			try {
 				Thread.sleep(16);
 			} catch (InterruptedException e) {
 				System.err.println(e);
 			}
-			this.gf.repaint();
+			//Trigger redrawing the things. Important: AWT-Context needed here!
+			EventQueue.invokeLater(new Runnable() {
+				public void run() {
+					gf.drawEntities();
+				}
+			});
 		}
 	}
 }