JSlider...

[Azteka1337]

I want to change the speed of the balls, nothing happens when I drag the slider...

Ok, have changed now to BorderLayout.CENTER and BorderLayout.SOUTH, thanks!

Can post everything, all my files.

I only want to change the speed of the balls, therefore I have:
public void stateChanged (ChangeEvent e)
{
Object kallan = e.getSource();
Slider slide = (Slider) kallan;

dx = slide.getValue(); // Then what?
dy = slide.getValue(); // and here ?
}



MAIN

import java.awt.*;
import javax.swing.*;
import java.util.Random;

public class Main
{
    public static void main(String[] args)
    {
         Boll b = new Boll ();
         JFrame ramen = new JFrame ("Flying things...");
         ramen.setSize(800, 640);
         ramen.setLocationRelativeTo(null);
         ramen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         Rummet rum = new Rummet ();
         ramen.add(rum, BorderLayout.CENTER);
         
         ramen.setVisible(true);
         ramen.setResizable(false);

         ramen.add(b.linjal (), BorderLayout.SOUTH);

         Random farg = new Random ();

         while (true)
         {
            int rod = farg.nextInt (256);
            int gron = farg.nextInt (256);
            int bla = farg.nextInt (256);
            Color farger = new Color (rod, gron, bla);

            b = new Boll (farger);
            rum.läggTillRitaBoll(b);

            Destination <Boll> dest = new Destination <Boll> (rum, b);
            new Thread (dest).start ();

            try
            {
                Thread.sleep(2000);
            }
            catch (Exception e)
            {
            }
         }
    }
}

Boll (BALL)

import java.awt.*;
import java.awt.geom.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class Boll implements FlyttaBoll, RitaBoll, ChangeListener
{
    private Slider linjal = new Slider (0, 5, 1);

    private int x;
    private int y;

    private int dx;
    private int dy;

    private Paint bollFarg;

    private int xStorlek;
    private int yStorlek;

    public Boll ()
    {
    }
    
    public Boll (Paint bollFarg)
    {
        this.bollFarg = bollFarg;
        this.xStorlek = 2;
        this.yStorlek = 2;

        this.x = 0;
        this.y = 0;

        this.dx = linjal.getValue();
        this.dy = linjal.getValue();
        linjal.addChangeListener(this);
      }

    public void rita (Graphics2D g)
    {
        Ellipse2D cirkel = new Ellipse2D.Double (x, y, xStorlek, yStorlek);
        g.setPaint (bollFarg);
        g.fill (cirkel);
    }

    public boolean flytta ()
    {
        if (x < 0 || x > 780)
        {
            dx = -dx;
        }
        if (y < 0 || y > 570)
        {
            dy = -dy;
        }

        x += dx;
        y += dy;

        boolean kvarIRummet = true;

        return kvarIRummet;
    }

    public void stateChanged (ChangeEvent e)
    {
        Object kallan = e.getSource();
        Slider slide = (Slider) kallan;

        this.dx = slide.getValue();
        this.dy = slide.getValue();
    }
    
    public Slider linjal ()
    {
        return linjal;
    }
}

Destination

class Destination <T extends RitaBoll & FlyttaBoll> implements Runnable
{
    private Rummet rum;

    private T boll;

    public Destination (Rummet rum, T boll)
    {
        this.rum = rum;
        this.boll = boll;
    }

    public void flytta ()
    {
        boolean ejDestination = boll.flytta ();

        while (ejDestination)
        {
            rum.repaint();

            try
            {
                Thread.sleep(4);
            }
            catch (Exception e)
            {
            }

            ejDestination = boll.flytta ();
        }
    }

    public void run ()
    {
        this.flytta ();
    }
}

Slider

import java.awt.Color;
import javax.swing.*;

public class Slider extends JSlider
{
    public Slider (int minstaVarde, int storstaVarde, int startVarde)
    {
        super (minstaVarde, storstaVarde, startVarde);

         this.setBackground(Color.BLACK);
         this.setMajorTickSpacing(1);
         this.setPaintTicks(true);
         this.setPaintLabels(true);
    }
}

Rummet (The room)

import javax.swing.*;
import java.awt.*;
import java.util.*;

public class Rummet extends JPanel
{
    private ArrayList <RitaBoll> bollar;

    public Rummet ()
    {
        this.setBackground(Color.BLACK);
        bollar = new ArrayList <RitaBoll> ();
    }

    @Override
    public void paintComponent (Graphics gr)
    {
        super.paintComponent(gr);
        Graphics2D g = (Graphics2D) gr;

        synchronized (this)
        {
            int antalBollar = bollar.size();
            RitaBoll boll = null;
            for (int i = 0; i < antalBollar; i++)
            {
                boll = bollar.get(i);
                boll.rita(g);
            }
        }
    }

    public synchronized void läggTillRitaBoll (RitaBoll boll)
    {
        bollar.add(boll);
    }
}

RitaBoll (PaintBall)

import java.awt.*;

public interface RitaBoll {
    void rita (Graphics2D g);
}

FlyttaBoll (MoveBall)

public interface FlyttaBoll{
    boolean flytta ();
}