Wilson Cash

Oh, I'm not sure if it does what I want or not, I'm just not sure how to do it. The code I posted just shows what I have so far.

Hi.

Is there a way to split a string into words, but only until a certain number of words? So for example, say I have a string "Hello my name is Adam", is it possible to split it into "Hello" "my" "name is Adam"?

My code right now:

String words[]; String message = "Hello my name is Adam"; words = message.split("\\s+"); for (int i = 0; i < words.length; i++) { System.out.println(words[i]); }

Thanks in advance.

Hi,

Thanks for the help guys. I have attached a screen shot of the projectile just as it touches the rocket. The numbers in the top left are the coordinates of the rocket (top) and projectile (bottom). (The rocket is a gray square for now)
I am pretty sure that the arraylists contain something because the projectiles and rockets are all rendered from the arraylist and removed when they are not on screen which indicates that the arraylist does contain some entries.

Hi,

I apologize if this is in the wrong board. The moderators can move it if it is.

I have two abstract classes. Rocket and Projectile, which look like this (I have only left the relevant parts)

public abstract class Rocket extends Entity{ protected int dx, dy; protected int y; protected int width = 20, height = 20; protected BufferedImage rocket = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); public Rocket(int x, int y, int health, int dir, int speed) { super(x, y, health, dir); this.y = y; this.dy = speed; this.dx = speed; visible = false; } public void tick(){ y = y + dy; if(y > Game.WIDTH * Game.SCALE){ visible = true; } } public void render(Graphics g){ g.drawImage(rocket, x, y, null); g.fillRect(x, y, width, height); // temporary } public Rectangle bounds() { return new Rectangle(x, y, width, height); } }

public abstract class Projectile extends Entity{ protected int xOrigin, yOrigin; protected double angle; protected BufferedImage projectile; protected double nx, ny; protected int x, y; protected double speed, range, damage; protected boolean removed = false; public static Rectangle bounds; public Projectile(int x, int y, int health, double dir) { super(x, y, health, dir); xOrigin = x; yOrigin = y; angle = dir; this.x = x; this.y = y; } protected void move(){ } public boolean isRemoved(){ return removed; } public Rectangle bounds() { return new Rectangle((int)x, (int)y, width, height); } }

Then I have subclasses extending those two classes (I will show NormalRocket and MachineGunProjectile) which call the super of bounds like so:

public class NormalRocket extends Rocket{ public int x; public int y; int dx, dy; public int width = 20, height = 20; int burnDuration = 20; int timer = 0; Base base = new Base(0, 0, 0, 0, 0, 0); public NormalRocket(int x, int y, int health, int dir, int speed) { super(x, y, health, dir, speed); this.x = x; this.y = y; visible = false; try { rocket = ImageIO.read(new File("res/rocket_normal.png")); } catch (IOException e) { e.printStackTrace(); } } public void tick(){ super.tick(); } public void render(Graphics g){ super.render(g); } public Rectangle bounds(){ return super.bounds(); } public boolean getVisible(){ return visible; } }

public class MachineGunProjectile extends Projectile{ private int width = 6, height = 6; private int x, y; public static final int FIRE_RATE = 15; public MachineGunProjectile(int x, int y, int health, double dir){ super(x, y, health, dir); this.x = x; this.y = y; range = 300; speed = 4; damage = 10; nx = speed * Math.cos(angle); ny = speed * Math.sin(angle); bounds = new Rectangle(this.x, this.y, this.width, this.height); try { projectile = ImageIO.read(new File("res//MachineGunProjectile.png")); } catch (IOException e) { e.printStackTrace(); } } public void tick(){ move(); if(x > Game.WIDTH * Game.SCALE || x < 0 || y > Game.HEIGHT * Game.SCALE || y < 0){ removed = true; } } protected void move(){ x += nx; y += ny; } public boolean isRemoved(){ return super.isRemoved(); } public Rectangle bounds(){ return super.bounds(); } public void collision(Rocket rocket){ super.collision(rocket); } public void render(Graphics g){ g.drawImage(projectile, (int)x, (int)y, null); } }

I have a level class which contains two lists, one for rockets and the other for projectiles, and rockets and projectiles are added to the respective lists:

public static ArrayList<Projectile> projectiles = new ArrayList<Projectile>(); private static ArrayList<Rocket> rockets = new ArrayList<Rocket>(); private void spawnRocket(int rocketType, int x) { switch (rocketType) { case ROCKET_NORMAL: rockets.add(new NormalRocket(x, -10, 80, 0, 2)); rocketsSpawned++; rocketsOnScreen++; break; case ROCKET_FIRE: if(difficulty > 1 && random.nextInt(100) > fireRocketSpawn){ rockets.add(new FireRocket(x, -10, 70, 0, 2)); rocketsSpawned++; rocketsOnScreen++; }else{ return; } break; case ROCKET_ZIPPER: if(difficulty > 2 && random.nextInt(100) > zipperRocketSpawn){ rockets.add(new ZipperRocket(x, -10, 40, 0, 4)); rocketsSpawned++; rocketsOnScreen++; }else{ return; } break; case ROCKET_TANK: if(difficulty > 3 && random.nextInt(100) > tankRocketSpawn){ rockets.add(new TankRocket(x, -10, 130, 0, 1)); rocketsSpawned++; rocketsOnScreen++; }else{ return; } break; } }

I am using the following code to check for collision between the projectiles and rockets. The problem is, that "HIT" is not printed and I cannot figure out why:

private void collision(){ for(int i = 0; i < projectiles.size(); i++){ for(int j = 0; j < rockets.size(); j++){ if(projectiles.get(i).bounds().intersects(rockets.get(j).bounds())){ System.out.println("HIT!"); } } } }

I do not know why this does not work, I have tried 2 different techniques so far and neither work. Can anyone help me solve this problem? I can post more code if it is necessary.

Thanks. That works perfectly.

Hi!

I'm working on a save system for my game, and everything is fine. However, I need to save some variables to a properties file, which are integers. However setProperty does not allow saving integers. I am asking how to write the int into the file without modifying it too much. Is this possible? I tried casting, but that does not seem to work. I think I need to parse the variables in some way, but I am clueless on how to do that.

Here is my code:

public static Properties saves = new Properties(); public void save(){ saves.setProperty("coinBank", player.getCoinBank()); try { saves.store(new FileOutputStream("saves.properties"), null); } catch (IOException e) { e.printStackTrace(); } } // This is in the player class public int getCoinBank(){ return coinBank; }

Thanks!

Ok I understand now. Thanks!

I'm not really sure what you mean by creating it? I have an InputHandler class.

Hi!

I have a game, and I just added a InputHandler class. The problem is that whenever I run my game, I get a java.lang.nullPointerException in my Player class where the if statement for checking if the key is pressed.

Game

import java.awt.Canvas; import java.awt.Dimension; import java.awt.Graphics; import java.awt.image.BufferStrategy; import java.awt.image.BufferedImage; import java.awt.image.DataBufferInt; import javax.swing.JFrame; import adam.miszczak.darkrun.entity.Coin; import adam.miszczak.darkrun.entity.ObstacleHole; import adam.miszczak.darkrun.entity.ObstacleWolf; import adam.miszczak.darkrun.entity.Player; import adam.miszczak.darkrun.gfx.Screen; public class Game extends Canvas implements Runnable{ private static final long serialVersionUID = 1L; public static final int WIDTH = 350; public static final int HEIGHT = WIDTH / 16 * 9; public static final int SCALE = 2; private Thread thread; private JFrame frame; private boolean running = false; private Screen screen; private BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB); private int[] pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData(); Player player = new Player(null); ObstacleWolf obstacleWolf = new ObstacleWolf(); ObstacleHole obstacleHole = new ObstacleHole(); Coin coin = new Coin(); public InputHandler input; public Game() { Dimension size = new Dimension(WIDTH * SCALE, HEIGHT * SCALE); setPreferredSize(size); screen = new Screen(WIDTH, HEIGHT); frame = new JFrame(); } public synchronized void start() { running = true; thread = new Thread(this, "Display"); thread.start(); } public synchronized void stop() { running = false; try { thread.join(); } catch (InterruptedException e) { e.printStackTrace(); } } public void run() { long lastTime = System.nanoTime(); long timer = System.currentTimeMillis(); final double ns = 1000000000.0 / 60.0; double delta = 0; int frames = 0; int ticks = 0; while(running){ long now = System.nanoTime(); delta += (now - lastTime) / ns; lastTime = now; while(delta >= 1){ tick(); ticks++; delta--; } render(); frames++; if(System.currentTimeMillis() - timer > 1000){ timer += 1000; System.out.println(ticks + " tps, " + frames + " fps"); ticks = 0; frames = 0; } } stop(); } public void tick(){ player.tick(); player.move(); obstacleHole.move(); obstacleWolf.move(); coin.move(); } public void render(){ BufferStrategy bs = getBufferStrategy(); if(bs == null){ createBufferStrategy(3); return; } for(int i = 0; i < pixels.length; i++){ pixels[i] = screen.pixels[i]; } Graphics g = bs.getDrawGraphics(); g.drawImage(image, 0, 0, getWidth(), getHeight(), null); player.render(g); obstacleHole.render(g); obstacleWolf.render(g); coin.render(g); g.dispose(); bs.show(); } public static void main(String[] args){ Game game = new Game(); game.frame.setResizable(false); game.frame.setTitle("Darkrun"); game.frame.add(game); game.frame.pack(); game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); game.frame.setLocationRelativeTo(null); game.frame.setVisible(true); game.start(); } }

InputHandler

import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.util.ArrayList; import java.util.List; public class InputHandler implements KeyListener{ public InputHandler(Game game){ game.addKeyListener(this); } public class Key{ private boolean pressed = false; private int numTimesPressed = 0; public int getNumTimesPressed(){ return numTimesPressed; } public boolean isPressed(){ return pressed; } public void toggle(boolean isPressed){ pressed = isPressed; if(pressed)numTimesPressed++; } } public List<Key> keys = new ArrayList<Key>(); public Key up = new Key(); public Key down = new Key(); public Key left = new Key(); public Key right = new Key(); public void keyPressed(KeyEvent e) { toggleKey(e.getKeyCode(), true); } public void keyReleased(KeyEvent e) { toggleKey(e.getKeyCode(), false); } public void keyTyped(KeyEvent e) { } public void toggleKey(int keyCode, boolean isPressed){ if(keyCode == KeyEvent.VK_UP){up.toggle(isPressed);} } }

Player

import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import adam.miszczak.darkrun.InputHandler; public class Player { int x; int y; int dx; public long xElapsed = 0; public int dy; int width = 50; int height = 75; int hangTime = 0; int maxHangTime = 100; public double playerSpeed = 0.3; public int coinsCollected = 0; public boolean isMoving = true; public boolean hasJumped = false; public boolean jumpReady = true; public boolean hasCollided = false; private BufferedImage moving1 = null; private InputHandler input; public Player(InputHandler input){ try { moving1 = ImageIO.read(new File("res/player_moving_1.png")); }catch (IOException e) { e.printStackTrace(); } x = 150; y = 250; this.input = input; } public void render(Graphics g){ Graphics2D g2d = (Graphics2D) g; g2d.drawImage(moving1, x, y, null); } public void move(){ x = x + dx; y = y + dy; xElapsed++; if(hasJumped == true){ dy = 1; hangTime++; } if(hangTime == maxHangTime){ dy = -1; } if(y == 150){ dy = 0; hasJumped = false; jumpReady = true; } } public void tick(){ if(jumpReady){ if(input.up.isPressed()){ hasJumped = true; jumpReady = false; } } } public void paint(Graphics g){ g.setColor(Color.RED); g.fillRect(x, y, width, height); } public int getX(){ return x; } public int getY(){ return y; } public long getXElapsed(){ return xElapsed; } public double getSpeed(){ return playerSpeed; } public int getCoinsCollected(){ return coinsCollected; } public Rectangle bounds(){ return (new Rectangle(x, y, width, height)); } }

I have tried lots of things but I just cannot figure this out. It's probably something that I just overlooked and can't find. Help is appreciated. Thanks!

This is the error message:

Exception in thread "Display" java.lang.NullPointerException at adam.miszczak.darkrun.entity.Player.tick(Player.java:76) at adam.miszczak.darkrun.Game.tick(Game.java:95) at adam.miszczak.darkrun.Game.run(Game.java:77) at java.lang.Thread.run(Unknown Source)

Not exactly sure how I would go about checking where it says that.

EDIT: I assume you mean the CPU field. In that case, it is 00 and goes up occasionally but it has not gone higher that 04. The memory usage is just below 46,000K

Hi,

I have a simple game set up, not yet finished, and only using basic rectangles for graphics right now.

The problem is, that when start the game for the first time after starting up eclipse (or my computer) the game runs at over 160 FPS, after a while though, it drops to 100, and if I launch it again, it stays at 100 FPS and occasionally speeding up to 167 FPS and slowing down again. Can anyone explain why this is happening, I can provide my code if necessary, if it is a problem with its efficiency.

Thanks in advance!

Hi!

I was making an app for the android, where if you press a button, a sound plays. The problem is, that after playing one sound, pressing the buttons again does nothing

public class MainActivity extends Activity { Button s1, s2, s3, s4; MediaPlayer ss1, ss2, ss3, ss4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.linear); s1 = (Button) findViewById(R.id.s1); s2 = (Button) findViewById(R.id.s2); s3 = (Button) findViewById(R.id.s3); s4 = (Button) findViewById(R.id.s4); s1.setOnClickListener(new View.OnClickListener(){ public void onClick(View v){ ss1 = MediaPlayer.create(MainActivity.this, R.raw.sound1); ss1.start(); } }); s2.setOnClickListener(new View.OnClickListener(){ public void onClick(View v){ ss2 = MediaPlayer.create(MainActivity.this, R.raw.sound2); ss2.start(); } }); s3.setOnClickListener(new View.OnClickListener(){ public void onClick(View v){ ss3 = MediaPlayer.create(MainActivity.this, R.raw.sound3); ss3.start(); } }); s4.setOnClickListener(new View.OnClickListener(){ public void onClick(View v){ ss4 = MediaPlayer.create(MainActivity.this, R.raw.sound4); ss4.start(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }

How can I fix this?

Thanks!

Hi,

I was trying to load an image and print it out on the screen, but for some reason it does not seem to appear. The path is correct (the file is in a res folder), but even with an image that is elsewhere on my computer with the correct file path it still does not work.

Game.java

import javax.swing.JFrame; import com.desecrationstudios.twilight.gfx.Screen; public class Game extends JFrame{ private static final long serialVersionUID = 1L; public static final int WIDTH = 500; public static final int HEIGHT = 350; public static final String NAME = "Game"; public Game(){ setSize(WIDTH, HEIGHT); setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setTitle(NAME); add(new Screen()); setVisible(true); } public static void main(String[] args){ new Game(); } }

Screen.java

import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.JPanel; import javax.swing.Timer; public class Screen extends JPanel implements ActionListener, KeyListener{ private static final long serialVersionUID = 2791049993836372036L; private Background background; public Screen(){ background = new Background(); Timer tick = new Timer(20, this); tick.start(); this.addKeyListener(this); this.setDoubleBuffered(true); this.setFocusable(true); } private void update(){ } public void PaintComponent(Graphics g){ super.paintComponent(g); //Background, will have its own function soon. Graphics2D g2d = (Graphics2D)g; g2d.drawImage(background.getImage(), background.getX(), background.getY(), this); } public void actionPerformed(ActionEvent arg0) { update(); repaint(); } public void keyPressed(KeyEvent arg0) { } public void keyReleased(KeyEvent arg0) { } public void keyTyped(KeyEvent arg0) { } }

Background.java

import java.awt.Image; import javax.swing.ImageIcon; public class Background { public int x = 0; public int y = 0; private Image background; public Background(){ ImageIcon i = new ImageIcon("/background_night_1.png"); background = i.getImage(); } public int getX() { return x; } public int getY() { return y; } public Image getImage() { return background; } }

Thanks!

Also, another question I have, is how would I define the drawImage function in the background class, so that in the screen.paintComponent method I just have to call background.paint(g) and it prints it out on the screen?
Something like this:

public void paint1(Graphics g){ g.setColor(Color.RED); g.fillRect(x, y, height, width); }

and then I just have to call player.paint(g) in screen.paintComponent method

but instead with an image like so:

public void paint(Graphics g){ ImageIcon i = new ImageIcon("/background_night_1.png"); background = i.getImage(); Graphics2D g2d = (Graphics2D)g; g2d.drawImage(background, x, y, this); }

but that does not work because "The method drawImage(Image, int, int, ImageObserver) in the type Graphics is not applicable for the arguments (Image, int, int, Background)"

Yeah, I'll use the the object oriented way more, however I will also use the boolean one for simple tests.

Thanks for the replies guys. Both worked well!