Coloquei na sessão java basico e ninguem soube responder… então vou tentar aqui
fiz o space invaders, não da erro algum no netbeans mas não carrega absolutamente nada, fica uma janela preta apenas =P!
(segui o coke and code: http://www.cokeandcode.com/info/tut2d.html)
Game.java
package space;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferStrategy;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Game extends Canvas {
private ArrayList removeList = new ArrayList();
private BufferStrategy strategy;
private boolean gameRunning = true;
private ArrayList entities = new ArrayList();
private Entity ship;
private int alienCount;
private boolean waitingForKeyPress = true;
private boolean logicRequiredThisLoop = false;
private String message = "";
private boolean leftPressed = false;
private boolean rightPressed = false;
private boolean firePressed = false;
private double moveSpeed = 300;
private long lastFire = 0;
private long firingInterval = 500;
public Game(){
JFrame container = new JFrame("Kinaite");
JPanel panel = (JPanel) container.getContentPane();
panel.setPreferredSize(new Dimension(800,600));
panel.setLayout(null);
setBounds(0,0,800,600);
panel.add(this);
setIgnoreRepaint(true);
container.pack();
container.setResizable(false);
container.setVisible(true);
container.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
addKeyListener(new KeyInputHandler());
requestFocus();
createBufferStrategy(2);
strategy = getBufferStrategy();
}
public void updateLogic() {
logicRequiredThisLoop = true;
}
public void tryToFire() {
if (System.currentTimeMillis() - lastFire < firingInterval) {
return;
}
lastFire = System.currentTimeMillis();
ShotEntity shot = new ShotEntity(this,"sprites/shot.gif",ship.getX()+10,ship.getY()-30);
entities.add(shot);
}
public void removeEntity(Entity entity) {
removeList.add(entity);
}
private void startGame() {
// clear out any existing entities and intialise a new set
entities.clear();
initEntities();
// blank out any keyboard settings we might currently have
leftPressed = false;
rightPressed = false;
firePressed = false;
}
private void initEntities() {
ship = new ShipEntity(this,"sprites/ship.gif",370,550);
entities.add(ship);
alienCount = 0;
for (int row=0;row<5;row++) {
for (int x=0;x<12;x++) {
Entity alien = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
entities.add(alien);
alienCount++;
}
}
}
public void notifyDeath(){
message = "Você perdeu =P!";
waitingForKeyPress = true;
}
public void notifyAlienKilled (){
alienCount--;
if (alienCount == 0) {
notifyWin();
}
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
if (entity instanceof AlienEntity) {
// speed up by 2%
entity.setHorizontalMovement(entity.getHorizontalMovement() * 1.02);
}
}
}
public void notifyWin(){
message = "Você ganhou";
waitingForKeyPress = true;
}
public void gameloop(){
long lastLoopTime = System.currentTimeMillis();
while (gameRunning){
long delta = System.currentTimeMillis() - lastLoopTime;
lastLoopTime = System.currentTimeMillis();
Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
g.setColor(Color.black);
g.fillRect(0,0,800,600);
g.dispose();
strategy.show();
try { Thread.sleep(10); } catch (Exception e) {}
if (!waitingForKeyPress) {
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.move(delta);
}
}
if (logicRequiredThisLoop) {
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.doLogic();
}
logicRequiredThisLoop = false;
}
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.draw(g);
}
for (int p=0;p<entities.size();p++) {
for (int s=p+1;s<entities.size();s++) {
Entity me = (Entity) entities.get(p);
Entity him = (Entity) entities.get(s);
if (me.collidesWith(him)) {
me.collidedWith(him);
him.collidedWith(me);
}
}
}
if (logicRequiredThisLoop) {
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.doLogic();
}
logicRequiredThisLoop = false;
}
if (waitingForKeyPress) {
g.setColor(Color.white);
g.drawString(message,(800-g.getFontMetrics().stringWidth(message))/2,250);
g.drawString("Aperte Qualquer tecla",(800-g.getFontMetrics().stringWidth("Aperte Qualquer tecla"))/2,300);
}
ship.setHorizontalMovement(0);
if ((leftPressed) && (!rightPressed)) {
ship.setHorizontalMovement(-moveSpeed);
} else if ((rightPressed) && (!leftPressed)) {
ship.setHorizontalMovement(moveSpeed);
}
if (firePressed) {
tryToFire();
}
try { Thread.sleep(10); } catch (Exception e) {}
}
}
private class KeyInputHandler extends KeyAdapter {
private int pressCount = 1;
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
leftPressed = true;
}
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
rightPressed = true;
}
if (e.getKeyCode() == KeyEvent.VK_SPACE) {
firePressed = true;
}
}
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
leftPressed = false;
}
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
rightPressed = false;
}
if (e.getKeyCode() == KeyEvent.VK_SPACE) {
firePressed = false;
}
}
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == 27) {
System.exit(0);
}
}
}
public static void main(String[] args) {
Game g = new Game();
g.gameloop();
}
}Entity.java
package space;
import java.awt.Graphics;
import java.awt.Rectangle;
public abstract class Entity {
protected double x;
protected double y;
protected double dx;
protected double dy;
protected String ref;
private Sprite sprite;
private Rectangle me;
private Rectangle him;
public Entity(String ref,int x,int y) {
this.sprite = SpriteStore.get().getSprite(ref);
this.x = x;
this.y = y;
}
public boolean collidesWith(Entity other) {
me.setBounds((int) x,(int) y,sprite.getWidth(),sprite.getHeight());
him.setBounds((int) other.x,(int) other.y,other.sprite.getWidth(),other.sprite.getHeight());
return me.intersects(him);
}
public void move(long delta) {
x += (delta * dx) / 1000;
y += (delta * dy) / 1000;
}
public void draw(Graphics g) {
sprite.draw(g,(int) x,(int) y);
}
public void setHorizontalMovement(double dx) {
this.dx = dx;
}
public void setVerticalMovement(double dy) {
this.dy = dy;
}
public double getHorizontalMovement() {
return dx;
}
public double getVerticalMovement() {
return dy;
}
public void doLogic() {
}
public int getX() {
return (int) x;
}
public int getY() {
return (int) y;
}
public abstract void collidedWith(Entity other);
}AlienEntity.java
package space;
public class AlienEntity extends Entity {
private Game game;
private double moveSpeed = 75;
public AlienEntity(Game game,String ref,int x,int y) {
super(ref,x,y);
this.game = game;
dx = -moveSpeed;
}
public void doLogic() {
dx = -dx;
y += 10;
if (y > 570) {
game.notifyDeath();
}
}
public void move(long delta) {
//limite de um lado;
if ((dx < 0) && (x < 10)) {
game.updateLogic();
}
//chegou ao limite do lado oposto?
if ((dx > 0) && (x > 750)) {
game.updateLogic();
}
// proceed with normal move
super.move(delta);
}
public void collidedWith(Entity other) {}
}ShipEntity.java
package space;
public class ShipEntity extends Entity{
private Game game;
public ShipEntity(Game game, String ref,int x,int y) {
super(ref,x,y);
this.game = game;
}
public void move(long delta) {
if ((dx < 0) && (x < 10)) {
return;
}
// não se move após o limite
if ((dx > 0) && (x > 750)) {
return;
}
super.move(delta);
}
public void collidedWith(Entity other) {
if (other instanceof AlienEntity) {
game.notifyDeath();
}
}
}ShotEntity.java
package space;
public class ShotEntity extends Entity {
private Game game;
private double moveSpeed = -300;
private boolean used = false;
public ShotEntity (Game game,String sprite, int x, int y){
super(sprite,x,y);
this.game = game;
dy = moveSpeed;
}
public void move(long delta) {
super.move(delta);
if (y < -100) {
game.removeEntity(this);
}
}
public void collidedWith(Entity other) {
if(used){
return;
}
if (other instanceof AlienEntity) {
game.removeEntity(this);
game.removeEntity(other);
game.notifyAlienKilled();
}
}
}Sprite.java
package space;
import java.awt.Graphics;
import java.awt.Image;
public class Sprite {
private Image image;
public Sprite(Image image){
this.image = image;
}
public int getWidth() {
return image.getWidth(null);
}
public int getHeight() {
return image.getHeight(null);
}
public void draw(Graphics g,int x,int y) {
g.drawImage(image,x,y,null);
}
}SpriteStore.java
package space;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import javax.imageio.ImageIO;
public class SpriteStore {
private static SpriteStore single = new SpriteStore();
public static SpriteStore get() {
return single;
}
private HashMap sprites = new HashMap();
public Sprite getSprite(String ref){
if (sprites.get(ref) != null) {
return (Sprite) sprites.get(ref);
}
BufferedImage sourceImage = null;
try {
URL url = this.getClass().getClassLoader().getResource(ref);
if (url == null) {
fail("Can't find ref: "+ref);
}
sourceImage = ImageIO.read(url);
} catch (IOException e) {
fail("Failed to load: "+ref);
}
//Carrega a imagem com a VGA ao invez de usar a CPU
GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
Image image = gc.createCompatibleImage(sourceImage.getWidth(),sourceImage.getHeight(),Transparency.BITMASK);
//desenhar o sprite
image.getGraphics().drawImage(sourceImage,0,0,null);
//Cria e retorna o sprite
Sprite sprite = new Sprite(image);
sprites.put(ref,sprite);
return sprite;
}
private void fail(String message) {
System.err.println(message);
System.exit(0);
}
}Sim eu tive um pouco de dificuldade no que esta relacionado aos sprites em si (imagens) não entendi oque ele fez para os spirtes aparecerem na tela, mas como o codigo estava la, eu colei no meu codigo, mas alem disso o resto eu entendi.