java jgrasp pingpong

[torlejv123]

Hi i was wondering if someone had the time and will to finish my applet (in jgrasp). Its an assignment for school that i really need to finish this weekend. Its the typical pong game, Two boards and a ball bouncing from side to side. I've managed to get the ball bounce around in a the box and I can move the two blocks up and down. Now to the problem, I can't figure out how to get the ball to bounce when it hits the blocks. The applet should also include a point-counting system thats counts every time the ball passes one of the blocks.


any ways here is the two parted applet:

/* Interaktivitet - lyssnare*/
import java.awt.*;
import java.applet.*;
// behövs för lyssnare
import java.awt.event.*;
import java.awt.Choice;
//implementerar lyssnare - actionlistener - för knappar
public class StartGUI extends Applet implements ActionListener
{
     Button startButton;
	  Button pauseButton;
     StartCanvas pc;
	  Choice level = null;
	  Choice bc = null;
	  Panel kn=new Panel();
	  public void init() 
     {
	 	   pc=new StartCanvas(this);
         startButton = new Button("Start game!");
			pauseButton = new Button("Pause game!");
			level = new Choice();
			//lägg till nivå
			level.add("1");
			level.add("2");
			level.add("3");
			level.add("4");
			 bc = new Choice();
			//lägg till bakgrundsfärg
			bc.add("Yellow");
			bc.add("Green");
		   bc.add("Gray");
			bc.add("White");
		     // lägg till lyssnare
          startButton.addActionListener(this);
    		 pauseButton.addActionListener(this);
	        			 
			  setLayout(new GridBagLayout());
			  GridBagConstraints c = new GridBagConstraints();
	        //fyll allt
			  c.fill = GridBagConstraints.BOTH;
	        //position    
			  c.gridx = 0;
	        c.gridy = 0;
			  //storlek på y
			  c.ipady = getHeight()-25;
			  add(pc, c);
			  //fyll panell först
	        kn.setLayout(new GridLayout(1,4,30,10));  
			  kn.add(startButton);
			  kn.add(pauseButton);
			  kn.add(bc);
	        kn.add(level);
			  //och till sist hela applet
			  c.ipady = 25;
			  c.gridx = 0;
			  c.gridy = 1;
	        add(kn, c);
			 
			 
			 
         }
			
			public void enableAll(boolean b)
			{
				level.setEnabled(b);
				bc.setEnabled(b);
				startButton.setEnabled(b);


			}
			
			
			
			
			
			
               //utförs när någon knapp trycks 
        public void actionPerformed(ActionEvent evt) 
         {
              //om det är ok knapp, rita om
              if (evt.getSource() == startButton) 
				  {
				       	pc.setVel(level.getSelectedItem());
				         pc.setPause(false);
							pc.setBackgroundCol(bc.getSelectedItem());
							enableAll(false);

                   
				  }
				  if(evt.getSource() ==pauseButton) 
				  {
				   pc.setPause(true);
				  	enableAll(true);

				  }

       } 
} 


/*trådar - animering*/
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.awt.event.KeyEvent;
//Implementera Runnable för trådar
public class StartCanvas extends Canvas implements Runnable,KeyListener
{
         public StartGUI sp;
         //tråd
			final int rx=10;
			final int ry=30;

         private Thread bollThread;
         //bållens x,y - koordinater      
			private int x=50,y=100;
			//bollens hastighet x och y koordinater
         private int vx=5,vy=5; 
			int ryh=150;
			int ryv=150;   
		   //true - om tråden körs , annars falsk
		   boolean running = true;
			//för att pausa tråden
			boolean pause = true;
			//bollens radie
 			private final int BR=10;
			//hur fort bilden uppdateras - konstant - nivå 1
			private final int VEL=100;
       	//hur fort bilden uppdateras
			private int vel=40;
			//bakgrundsfärg
			Color  bgColor=Color.white;
		   public StartCanvas(StartGUI p)
         {
			      sp=p;
			 	   //skapa och starta tråden
		         bollThread= new Thread(this);
               bollThread.start();
			 		addKeyListener( this );
         }
			
			
			public void setVel(String nr)
			{
				vel=VEL/Integer.parseInt(nr);
			}
			
		
       			
				public void update(Graphics g) {
						Graphics offgc;
						//skapa en buffer för att lagra bilden 
						Image	offscreen = createImage(getWidth(), getWidth());
						offgc = offscreen.getGraphics();
						// tömm hela ytan = fyll allt med bakgrundsfärg
						offgc.setColor(getBackground());
						offgc.fillRect(0, 0,getWidth(), getWidth());
						offgc.setColor(getForeground());
						//omritning - lagra hela bilden i buffer
						paint(offgc);
						//när hela bilden blir klar skicka den till skärmen 
						g.drawImage(offscreen, 0, 0, this);
         }
	
         //stoppa tråden , när appleten avslutas
		   public void destroy()
         {
              // stoppa tråden
				    running = false;
                bollThread = null;
         }
         public void paint(Graphics g)
			{
			    setBackground(bgColor);
			    //kolla X gränser 
			    if (checkXBoundaries())
                   vx=-vx;
						 
	          //kolla Y gränser 
				 if (checkYBoundaries())
              {    
						 
						 vy=-vy;
				}
				
				
					 
							 
				 //uppdatera x koordinater
			    
				 x+=vx;
				 y+=vy;
				 g.setColor(new Color(0,0,255));
				 g.fillArc(x,y, BR, BR,0,360); //rita  en röd cirkel
					 
				 g.fillRect(10,ryv,rx,ry);
				 g.fillRect(360,ryh,rx,ry);
				 

			
 
			}
			
		   //bestäm färgen	
			public void setBackgroundCol(String col)
			{
				if(col.equals("Green"))
					bgColor=Color.green;
				if(col.equals("Yellow"))
					bgColor=Color.yellow;
				if(col.equals("Gray"))
					bgColor=Color.gray;
				if(col.equals("White"))
					bgColor=Color.white;

				
			}
			
			
			//ha en paus
			public void setPause(boolean p)
			{
				pause=p;
			}
			
			 public void keyPressed( KeyEvent e ){}
			public void keyReleased( KeyEvent e ) { }
			public void keyTyped( KeyEvent e ) {
			char c = e.getKeyChar();
      	if ( c == 'w' && ryv>5) 
					ryv=ryv-5;
			if (c== 'd' && ryv+ry < getHeight()-5)
				ryv=ryv+5;
			
			if (c== 'o' && ryh >5)
					ryh=ryh-5;
			
			if (c== 'k' && ryh+ry < getHeight()-5)
						ryh=ryh+5;
		 
			repaint();
			e.consume();
			
			
		
			
				
				
		}
		
      
			
			
	
			
			
			
			
			//kolla x och y gränser
			private boolean checkYBoundaries()
			{
				return (y<0 && BR<=ry || y+BR>getHeight());
			}
			
			private  boolean checkXBoundaries()
			{
			   return (x<0 && BR<=rx|| x+BR>getWidth());

			 }
		  //omritningen händer i denna tråd
		  public void run()
	     {
	          //lopp där uppdateringen (omritningen) skers
	          while (running)
	          {
				   if(!pause)
					{
			               try
			               {
			                     // vänta vel ms
			                     bollThread.sleep(vel);
										repaint();
			               }
			               catch (InterruptedException e)
			               {
			                    System.out.println(e);
			                }
					 }
	           }
	     }
}

[Fubarable]

Hi i was wondering if someone had the time and will to finish my applet (in jgrasp).

Please, this is not a homework finishing forum.

If you want our help, and are willing to do the work yourself, then please ask us specific questions about bugs in your code or concepts you're not clear on and we'll be more than happy to help you. Best of luck.

edit: Also consider creating more classes including a Ball class and a Paddle class. Then giving the game a "model" -- a non-gui class that runs the game and that the GUI portion uses to paint itself with. This assignment will be a lot easier if you can divide out your concepts so you can work on the ball bouncing logic in isolation of the GUI.