Help with Space Invaders Game

• • Reply

  11 years ago

  by deathwings

  phil hunter

  Belfast, United Kingdom

  Joined 11 years ago

  Hi, im new to these forums so forgive if i dont follow the right way on laying things out. Im trying to create space invaders game but im stuck when im trying to create multiple aliens/ invaders. I have a class called Aliens (which is the invaders), and i can create an instance of an Alien. But when I try to create multiple instances they are not showing up on screen. I am not getting any error message sthough (which im hoping is a good sign, lol).

  GamePanel is where all the action is and Alien is the alien/ invader class.

  Here is the code:

  import java.awt.; import javax.swing.; import java.awt.Image; import java.awt.event.KeyListener; import java.awt.event.KeyEvent;

  public class GamePanel extends JComponent implements KeyListener { SpaceInvaders game; static Player player1; Aliens alien1; static public Image spaceship2R; static public Image spaceship2L;

  public GamePanel(SpaceInvaders game)
  {
  	this.game = game;
  
  	player1 = new Player(this);
  	player1.start();
  
  	for(int i=0; i<4; i++)
  	{
  		alien1 = new Aliens(this);
  		alien1.setX(i*100);
  		alien1.start();
  	}
  
  
      this.setFocusable(true);
      this.addKeyListener(this);
  }
  
  public void paintComponent(Graphics g)
  {
  	Image pic1 = player1.getImage();
  	Image pic2 = alien1.getImage();
  
  	super.paintComponent(g);
  
  	g.drawImage(pic1, player1.getX(), player1.getY(), 50, 50,this);
  	g.drawImage(pic2, alien1.getX(), alien1.getY(), 50, 50,this);
  
  }
  

  }//end class

  import java.awt.Image; import java.awt.*;

  class Aliens extends Thread { //variables GamePanel parent; private boolean isRunning; private int xPos = 0, yPos = 0; Thread thread; static char direction = 'r'; Aliens alien; static public Image alien1; static public Image alien2;

  public Aliens(GamePanel parent)
  {
  	this.parent = parent;
  	isRunning = true;
  }
  
  public void run()
  {
  	while(isRunning)
  	{
  		Toolkit kit = Toolkit.getDefaultToolkit();
  		alien1 = kit.getImage("alien1.gif");
  		alien2 = kit.getImage("alien2.gif");
  
  		try
               {       
               	thread.sleep(100);
               }
               catch(InterruptedException e)
               {
              	 System.err.println(e);
               }
          	updateAliens();
          	parent.repaint();
  	}
  
  }
  
  public static Image getImage()
  {
  	Image alienImage = alien1;
      switch(direction){
      	case('l'):
      		alienImage = alien1;
      		break;
      	case('r'):
      		alienImage = alien1;
      		break;
      }
      return alienImage;	
  }
  
  public void updateAliens()
  {
  	if(direction=='r')
  	{
  		xPos+=20;
  		if(xPos >= SpaceInvaders.WIDTH-50||xPos < 0)
  		{
  			yPos+=50;
  			xPos-=20;
  			direction='l';
  		}
  	}
  	else
  	{
  		xPos-=20;
  		if(xPos >= SpaceInvaders.WIDTH-50||xPos < 0)
  		{
  			yPos+=50;
  			xPos+=20;
  			direction='r';
  		}
  	}
  
  }
  
  public void setDirection(char c){ direction = c; }
  public void setX(int x){ xPos = x; }
  public void setY(int y){ yPos = y; }
  public int getX(){ return xPos; }
  public int getY(){ return yPos; }
  

  }//end class

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• • Reply

  11 years ago

  by deathwings

  phil hunter

  Belfast, United Kingdom

  Joined 11 years ago

  problem was sorted, fixed it.

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