Más practica menos teoría.: thread

Capturas de Pantalla

Codigo

package masterdavidjavabasico;

import java.awt.*;
import java.applet.Applet;

public class BouncingLines extends Applet implements Runnable {

    Thread runner = null;

    final static int WIDTH = 600;
    final static int HEIGHT = 500;

    Image    image;
    Graphics graphics;

    int[] x1;
    int[] y1;
    int[] x2;
    int[] y2;

    int dx1 = 2 + (int)( 3 * Math.random() );
    int dy1 = 2 + (int)( 3 * Math.random() );
    int dx2 = 2 + (int)( 3 * Math.random() );
    int dy2 = 2 + (int)( 3 * Math.random() );

    static int first = 0;

    final static int LINES = 50;

    public void init() {

        x1 = new int[LINES];
        y1 = new int[LINES];
        x2 = new int[LINES];
        y2 = new int[LINES];



        x1[0] = (int)( WIDTH * Math.random() );
        y1[0] = (int)( HEIGHT * Math.random() );
        x2[0] = (int)( WIDTH * Math.random() );
        y2[0] = (int)( HEIGHT * Math.random() );



        for ( int i = 1; i < LINES; i++ ) {

            x1[i] = x1[0];
            y1[i] = y1[0];
            x2[i] = x2[0];
            y2[i] = y2[0];
        }
        image    = createImage( WIDTH, HEIGHT );
        graphics = image.getGraphics();
    }

    public void start() {



        if ( runner == null ) {

            runner = new Thread( this );
            runner.start();
        }
    }

    public void stop() {



        if ( runner != null && runner.isAlive() )
            runner.stop();

        runner = null;
    }

    public void run() {

        while (runner != null) {

            repaint();

            try {

                Thread.sleep( 20 );

            } catch ( InterruptedException e ) {


            }
        }
    }

    public void paint( Graphics g ) {

        update( g );
    }

    public void update( Graphics g ) {

        graphics.setColor( Color.white );
        graphics.fillRect( 0, 0, WIDTH, HEIGHT );



        graphics.setColor( Color.red );

        int line = first;

        for ( int i = 0; i < LINES; i++ ) {

            graphics.drawLine( x1[line], y1[line],
                               x2[line], y2[line] );
            line++;
            if ( line == LINES ) line = 0;
        }

        line = first;

        first--;

        if ( first < 0 ) first = LINES - 1;

        x1[first] = x1[line];
        y1[first] = y1[line];
        x2[first] = x2[line];
        y2[first] = y2[line];


        if (x1[first] + dx2 < WIDTH)
            x1[first] += dx1;
        else
            dx1 = -(2 + (int)( 3 * Math.random() ));

        if (x1[first] + dx1 >= 0)
            x1[first] += dx1;
        else
            dx1 = 2 + (int)( 3 * Math.random() );

        if (y1[first] + dy1 < HEIGHT)
            y1[first] += dy1;
        else
            dy1 = -(2 + (int)( 3 * Math.random() ));

        if (y1[first] + dy1 >= 0)
            y1[first] += dy1;
        else
            dy1 = 2 + (int)( 3 * Math.random() );

        if (x2[first] + dx2 < WIDTH)
            x2[first] += dx2;
        else
            dx2 = -(2 + (int)( 3 * Math.random() ));

        if (x2[first] + dx2 >= 0)
            x2[first] += dx2;
        else
            dx2 = 2 + (int)( 3 * Math.random() );

        if (y2[first] + dy2 < HEIGHT)
            y2[first] += dy2;
        else
            dy2 = -(2 + (int)( 3 * Math.random() ));

        if (y2[first] + dy2 >= 0)
            y2[first] += dy2;
        else
            dy2 = 2 + (int)( 3 * Math.random() );

        g.drawImage( image, 0, 0, this );
    }
}

Descargar Programa

http://www.megaupload.com/?d=Y2HWCBWU

Codigo

package masterdavidjavabasico;

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

public class Demo1 extends JComponent {

    private final static int ANCHO = 512;

    private final static int ALTO = 384;

    private final static int DIAMETRO = 20;

    private float x, y;

    private float vx, vy;

    public Demo1() {
        setPreferredSize(new Dimension(ANCHO, ALTO));
        x = 10;
        y = 20;
        vx = 300;
        vy = 400;
    }

    private void fisica(float dt) {
        x += vx * dt;
        y += vy * dt;
        if (vx < 0 && x <= 0 || vx > 0 && x + DIAMETRO >= ANCHO)
            vx = -vx;
        if (vy < 0 && y < 0 || vy > 0 && y + DIAMETRO >= ALTO)
            vy = -vy;
    }

    public void paint(Graphics g) {
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, ANCHO, ALTO);
        g.setColor(Color.RED);
        g.fillOval(Math.round(x), Math.round(y), DIAMETRO, DIAMETRO);
    }

    private void dibuja() throws Exception {
        SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    paintImmediately(0, 0, ANCHO, ALTO);
                }
            });
    }

    public void cicloPrincipalJuego() throws Exception {
        long tiempoViejo = System.nanoTime();
        while (true) {
            long tiempoNuevo = System.nanoTime();
            float dt = (tiempoNuevo - tiempoViejo) / 1000000000f;
            tiempoViejo = tiempoNuevo;
            fisica(dt);
            dibuja();
        }
    }

    public static void main(String[] args) throws Exception {
        JFrame jf = new JFrame("Demo1");
        jf.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    System.exit(0);
                }
            });
        jf.setResizable(false);
        Demo1 demo1 = new Demo1();
        jf.getContentPane().add(demo1);
        jf.pack();
        jf.setVisible(true);
        demo1.cicloPrincipalJuego();
    }
}

Descargar el Programa

http://www.megaupload.com/?d=7J2E0PXE

Páginas

Animacion Con Lineas en Java

Animacion Sencilla en Java usando un circulo