お絵かきコラボレーション

そのうちにサーバを介してネットワーク対応版を作ってみようかな。。。

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ClientFrame.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;

import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;

/**
* $Id: Collaboration.html,v 1.1 2009/06/22 16:11:40 kishi Exp kishi $
* @author KISHI Yasuhiro
*/

public class ClientFrame extends JFrame {

    private DrawingPanel panel = null;

    public ClientFrame ( int x, int y, String userName ) {
        super( "お絵かきコラボレーションのテスト(" + userName + ")" );

        try {
            // 外観を設定します
            UIManager.setLookAndFeel( "com.sun.java.swing.plaf.windows.WindowsLookAndFeel" );
            // 外観を変更します
            SwingUtilities.updateComponentTreeUI( this );
        } catch ( Exception e ) {
            e.printStackTrace();
            System.exit( -1 );
        }

        setBounds( x, y, 640, 480 );

        panel = new DrawingPanel();
        Container container = getContentPane();
        container.add( panel );

        setVisible( true );

        addWindowListener( new WindowAdapter() {
                               public void windowClosing( WindowEvent ev ) {
                                   dispose();
                                   System.exit( 0 );
                               }
                           }
                         );

    }

    public DrawingPanel getDrawingPanel() {
        return this.panel;
    }

    public void setCollaborator( ClientFrame frame ) {
        DrawingPanel cPanel = frame.getDrawingPanel();
        panel.setCollaboratorPanel( cPanel );
    }

    private static void createAndShowGUI() {

        ClientFrame frame1 = new ClientFrame( 0, 0, "ユーザA" );
        ClientFrame frame2 = new ClientFrame( 0, 500, "ユーザB" );

        frame1.setCollaborator( frame2 );
        frame2.setCollaborator( frame1 );
    }

    public static void main( String[] args ) {
        javax.swing.SwingUtilities.invokeLater( new Runnable() {
                                                    public void run() {
                                                        createAndShowGUI();
                                                    }
                                                }
                                              );

    }

}

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DrawingPanel.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;

import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;

import javax.imageio.*;
import java.awt.image.*;

import java.io.*;

/**
* $Id: Collaboration.html,v 1.1 2009/06/22 16:11:40 kishi Exp kishi $
* @author KISHI Yasuhiro
*/

public class DrawingPanel extends JPanel implements ActionListener {
    private BufferedImage offImage = null;
    private Point currentPoint;
    private DrawingPanel cPanel;

    public DrawingPanel() {
        super();

        setLayout( null );

        // 透明にする
        setOpaque( false );

        JButton saveButton = new JButton( "画像を保存" );
        saveButton.setLocation( 500, 350 );
        saveButton.setSize( 100, 50 );
        saveButton.setActionCommand( "SAVE" );
        saveButton.addActionListener( this );
        this.add( saveButton );

        this.addMouseMotionListener( new MouseMotionAdapter() {
                                         public void mouseDragged( MouseEvent e ) {

                                             // マウスの位置をセット
                                             Point p = e.getPoint();

                                             if ( offImage == null ) {
                                                 // ここは注意が必要 ⇒ BufferedImage.TYPE_INT_ARGB
                                                 // BufferedImage.TYPE_INT_RGBを使うと下のレイヤーの画像が塗り消されてしまいます
                                                 // アルファチャネルも追加しておく
                                                 offImage = new BufferedImage( getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB );
                                             }

                                             Graphics2D g2d = ( Graphics2D ) offImage.createGraphics();

                                             g2d.setStroke( new BasicStroke( 3.0F ) );
                                             g2d.setPaint( Color.black );
                                             g2d.drawLine( currentPoint.x, currentPoint.y, p.x, p.y );
                                             g2d.dispose();

                                             repaint();

                                             // コラボレータのオフ画像を取得
                                             BufferedImage cOffImage = cPanel.getOffImage();

                                             if ( cOffImage == null ) {
                                                 // ここは注意が必要 ⇒ BufferedImage.TYPE_INT_ARGB
                                                 // BufferedImage.TYPE_INT_RGBを使うと下のレイヤーの画像が塗り消されてしまいます
                                                 // アルファチャネルも追加しておく
                                                 cOffImage = new BufferedImage( getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB );
                                             }
                                             Graphics2D g2d_other = ( Graphics2D ) cOffImage.createGraphics();

                                             g2d_other.setStroke( new BasicStroke( 3.0F ) );
                                             g2d_other.setPaint( Color.red );
                                             g2d_other.drawLine( currentPoint.x, currentPoint.y, p.x, p.y );
                                             g2d_other.dispose();

                                             cPanel.repaint();

                                             // マウスの位置をセット
                                             currentPoint = e.getPoint();

                                         }
                                     }
                                   );

        this.addMouseListener( new MouseAdapter() {
                                   public void mousePressed( MouseEvent e ) {
                                       currentPoint = e.getPoint();
                                   }
                               }
                             );

    }

    public void paintComponent( Graphics g ) {
        super.paintComponent( g );

        if ( offImage != null ) {
            ( ( Graphics2D ) g ).drawImage( offImage, 0, 0, this );
        }
    }

    public void setCollaboratorPanel( DrawingPanel cPanel ) {
        this.cPanel = cPanel;
    }

    public BufferedImage getOffImage() {
        return this.offImage;
    }

    public void actionPerformed( ActionEvent event ) {
        String command = event.getActionCommand();

        if ( "SAVE".equals( command ) ) {
            System.out.println( "画像をファイルに保存しています..." );
            try {

                boolean result = ImageIO.write( offImage, "png", new File( "mytest" + this.toString() + ".png" ) );

                System.out.println( "画像をファイルに保存しました！" );
            } catch ( Exception e ) {
                e.printStackTrace();
            }

        }
    }

}