Swingでグラフィック！

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<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="generator" content=
"HTML Tidy for Cygwin (vers 1st September 2004), see www.w3.org" />
<title>Hello World Applet</title>
</head>
<body>
<applet code="DoubleBufferingTest" width="600" height="600"></applet>
</body>
</html>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/**
<pre>
Swingでは勝手にダブルバッファリングしてくれるので便利！
</pre>
$Id: SwingGraphics.html,v 1.1 2009/06/22 16:11:58 kishi Exp kishi $
@author KISHI Yasuhiro
*/

public class DoubleBufferingTest extends JApplet implements ItemListener {

    public void init() {

        Container contentPane = getContentPane();
        contentPane.setLayout( new FlowLayout() );

        GlobalPainter gp = new GlobalPainter();

        gp.setPreferredSize( new Dimension( 400 , 400 ) );

        contentPane.add( gp );

        Checkbox checkbox = new Checkbox( "色を変えます" , true );

        //------------------------------------------------------
        // ItemListenerをチェックボックスに対して追加
        //------------------------------------------------------
        checkbox.addItemListener( gp );
        checkbox.addItemListener( this );

        contentPane.add( checkbox );
    }

    public void itemStateChanged( ItemEvent e ) {
        Checkbox checkbox = ( Checkbox ) e.getItemSelectable();

        System.out.println( "checkbox status = " + checkbox.getState() );

        /* ------- ダブルバッファリングしているかどうかのテストコード ---------------
               getRootPane().setDoubleBuffered( ch.getState() );
               ( ( JComponent ) getContentPane() ).setDoubleBuffered( ch.getState() );
        ----------------------------------------------------------------------------*/
    }

}

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

/**
<pre>
様々な図形などの描画をコントロールするクラス
</pre>
$Id: SwingGraphics.html,v 1.1 2009/06/22 16:11:58 kishi Exp kishi $
@author KISHI Yasuhiro
*/

class GlobalPainter extends JComponent implements Runnable, ItemListener {
    private int count = 0;
    private int x = 0;
    private Color color = Color.blue;
    private Dimension dim = getSize();

    /** 矩形を別スレッドで描画するクラス */
    private RectFiller rf1;
    private RectFiller rf2;

    public GlobalPainter() {
        ( new Thread( this ) ).start();

        rf1 = new RectFiller( new Color( 0x33, 0x00, 0x99 ), 30, 40 );
        rf1.start();

        rf2 = new RectFiller( Color.yellow, 50, 60 );
        rf2.start();
    }

    public void run() {

        while ( true ) {
            x += 3;
            if ( x > 100 ) {
                x = 0;
            }

            /************* 【重要】 ****************/
            SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
                        repaint();
                    }
                }
            );

            try {

                Thread.sleep( 10 );

            } catch ( Exception exception ) {}
        }

    }

    public void paintComponent( Graphics g ) {

        g.setColor( color );
        g.fillRect( 10 , 10 , 10 + x , 20 );

        /* このオブジェクトは別スレッドで動いている */
        rf1.paint( g );
        rf2.paint( g );
    }


    public void itemStateChanged( ItemEvent e ) {
        // チェックボックスの状態で色を変える
        Checkbox checkbox = ( Checkbox ) e.getItemSelectable();

        count++;
        System.out.println( "count=" + count );

        if ( checkbox.getState() ) {
            this.color = Color.blue;
        } else {
            this.color = Color.red;
        }
    }
}

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

/**
$Id: SwingGraphics.html,v 1.1 2009/06/22 16:11:58 kishi Exp kishi $
@author KISHI Yasuhiro
*/

public class RectFiller extends Thread {
    private int x = 0;
    private Color color;
    private int sx;
    private int sy;

    public RectFiller( Color color, int sx, int sy ) {
        this.color = color;
        this.sx = sx;
        this.sy = sy;
    }

    public void paint( Graphics g ) {
        g.setColor( color );
        g.fillRect( sx , sy , 10 + x , 20 );
    }

    public void run() {
        while ( true ) {
            if ( x++ > 100 ) {
                x = 0;
            }
            try {
                sleep( 100 );
            } catch ( Exception exception ) {}

            System.out.println( "x=" + x );
        }
    }
}
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