How to run all methods of a java applet without specifically calling them?

Question

I've just started creating a portal game through applet (yes I know it's totally outdated and I should be using swing blah blah blah), and so far I've only encountered one problem. The browser/appletviewer only calls paint and init automatically. If I want to call a method which needs a keyevent, that can't happen because init doesn't receive anything and paint only receives a Graphic. Therefore I can't call the method thinkerbox, which is kind of important. Here is my code so far (in two classes):

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class portal extends Applet
{

public Image stickA;
public int x = 90;
public int y = 20;

public void init()
{
    stickA = getImage( getDocumentBase(), "stick.jpg" );
}

public void thinkerbox( Graphics screen, KeyEvent e )
{
    addKeyListener(new keyaction());
    keyaction asdf = new keyaction();
    asdf.useKeys( e, screen );
}

public void moveRight( Graphics screen )
{
    addKeyListener(new keyaction());
    screen.setColor( Color.WHITE );
    screen.fillRect( x, y, 100, 100 );
    x += 10;
    paint( screen );
}

public void moveLeft( Graphics screen )
{
    screen.setColor( Color.WHITE );
    screen.fillRect( x, y, 100, 100 );
    x -= 10;
    paint( screen );
}

public void moveUp( Graphics screen )
{
    screen.setColor( Color.WHITE );
    screen.fillRect( x, y, 100, 100 );
    y += 10;
    paint( screen );
}

public void moveDown( Graphics screen )
{
    screen.setColor( Color.WHITE );
    screen.fillRect( x, y, 100, 100 );
    y -= 10;
    paint( screen );
}

public void paint( Graphics screen )
{
    setBackground( Color.WHITE );

    screen.setColor( Color.RED ); 
    screen.fillOval( 20, 20, 40, 80 ); //red portal1
    screen.fillOval( 200, 200, 40, 80 ); //red portal2

    screen.drawImage( stickA, x, y, 100, 100, this );
}
}

And the second one:

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class keyaction extends KeyAdapter
{

public void useKeys( KeyEvent e, Graphics screen )
{
    int keycode = e.getKeyCode();
    portal p = new portal();

    p.thinkerbox( screen, e );

    if( keycode == KeyEvent.VK_LEFT )
    {
        p.moveLeft( screen );
    }
    else if( keycode == KeyEvent.VK_RIGHT )
    {
        p.moveRight( screen );
    }
    else if( keycode == KeyEvent.VK_UP )
    {
        p.moveUp( screen );
    }
    else if( keycode == KeyEvent.VK_DOWN )
    {
        p.moveDown( screen );
    };
}
}

Help please?

score 1 · Answer 1 · answered Mar 29 '13 at 02:46

Suggestions:

Yes use Swing. You've no reason why not.
Use Key Bindings instead of a KeyListener.
Call your move methods in your binding actions.
Have your these methods change the state of your class -- change the value of one or more of the class fields.
Then call repaint()
Have your drawing JComponent's paintComponent(Graphics g) method use the class fields to decide what to draw where.

How to run all methods of a java applet without specifically calling them?

1 Answers1