Name: gsC80088 Date: 11/12/98


/*
  Bug in JDK1.2 RC1

  This program runs properly under jdk 1.1.7, but fails under
  JDK 1.2 RC1, as well as jdk1.2beta4.2, beta 4.1 and beta 4

  This program graphically copies component to an Image. This is
  useful in producing screen dumps of java components or web pages
  automatically.

  Under JDK 1.1.7, it opens a window, adds some components to it,
  then creates a graphical copy and puts this into a second window.

  Under JDK 1.2beta4.2, it produces a class cast exception, as
  follows:

  Exception in thread "main" java.lang.ClassCastException:
  sun.awt.image.BufferedImageGraphics2D
        at sun.awt.windows.WComponentPeer.print(WComponentPeer.java:92)
        at sun.awt.windows.WCanvasPeer.print(WCanvasPeer.java:47)
        at sun.awt.windows.WPanelPeer.print(WPanelPeer.java:24)
        at java.awt.Component.printAll(Component.java:1966)
        at DumpBug.dump(DumpBug.java:xx)
        at DumpBug.main(DumpBug.java:xx)

  The line which generated the exception is marked below with a comment.

  This was tested on Windows 98, using JDK1.2 RC1

  This bug was reported previously under JDK 1.2, 1.2Beta4, and 1.2 Beta 4.1
*/

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

public class DumpBug
{
    Panel mp;
    Canvas mPic;

    static Frame mf;
    
    public static void main(String[] args)
    {
        mf = new Frame("Main window");
        mf.setBounds (10, 10, 300, 200);
        mf.addWindowListener
        (
            new WindowAdapter()
            {
                public void windowClosing(WindowEvent evt)
                {
                    System.exit(0);
                }
            }
        );
        DumpBug db = new DumpBug(mf);
        mf.show();
        db.dump();
    }
    
    DumpBug(Frame mf)
    {
        mp = new Panel(new BorderLayout());
        mp.add(BorderLayout.NORTH, new Label("Dump test"));
        mp.add(BorderLayout.CENTER, new Button("Nothing"));
        mf.add(mp);
        mf.validate();
    }
    
    Image mImage;
    void dump()
    {
        Dimension theSize = mp.getSize();
        mImage = mp.createImage(theSize.width, theSize.height);
        Graphics gr = mImage.getGraphics();
        mp.printAll(gr); // ClassCastException generated here
        
        Frame osFrame = new Frame("Off-screen Duplicate");
        osFrame.setLocation(350, 10);
        Insets in = mf.getInsets();
        osFrame.setSize(
            theSize.width + in.left + in.right,
            theSize.height + in.top + in.bottom
        );
        mPic = new Canvas()
        {
            public void paint(Graphics gr)
            {
                gr.drawImage(mImage, 0, 0, mPic);
            }
        };
        osFrame.add(mPic);
        osFrame.show();
    }
}
(Review ID: 41482)
======================================================================

Name: krT82822 Date: 08/27/99


The created off-screen image doesn't print out.

What I am trying to do is to print all the component in the window,
such as a screen shot. The reason using an image instead of printing
directly all the components on the print Graphic object is to scale
down the window size. What I mean is that sometime the window size
is bigger than the printer paper size.
Thus, I need to scale the window down to fit the print paper.

First, I tried to create an off screen image and print all components
in it. Next, I used the g.drawImage() method to scale the off screen
image down.

If I test this under the Sun system, it always works.
( I tested this under jdk1.1.7 and 1.2 )
But if I test this under the Window NT, it won't work at all.
I only got the blank page.
( I tested this under jdk1.1.7 and jdk1.1.8 )

Here is my test code to reproduce it.

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

public class PrintTest extends Panel
        implements ActionListener
{
        Button btn;
        public PrintTest()
        {
                dotheLayout();
        }

        public void dotheLayout()
        {
                btn = new Button("Print");
                btn.addActionListener( this );
                btn.setActionCommand("Print");

                add( btn );

        }


        public void actionPerformed( ActionEvent e )
        {
                String cmd = e.getActionCommand();

                if( cmd.equals("Print") ){
                        System.out.println("Print button clicked!!");
                        printWindow();

                }
        } // method actionPerformed()

    public void printWindow()
    {
                System.out.println("***print method is called in printWindow***");
                // Get a PrintJob object from the system.
                // This posts a Print dialog.
                Toolkit toolkit = this.getToolkit();
                PrintJob job = toolkit.getPrintJob( (Frame)getParent(), "Printing Test", null );
                
                if ( job != null ) { // in case of clicking OK in a Print dialog.
                        Graphics g = job.getGraphics();
                        Graphics imgG = null;

                        Dimension winSize = this.getSize();
                                        
                        // Create an image and print all components in the image
                        Image winImage = createImage( winSize.width, winSize.height );
                        imgG = winImage.getGraphics();

                        printAll( imgG );

                        // just check if it draws a string in the image
                        imgG.setFont( new Font("Helvetica", Font.BOLD, 20) );
                        imgG.setColor( Color.black );
                        imgG.drawString("image test", 50, 50 );
                        imgG.drawRect(10, 10, 50, 50 );

                        g.translate( 10, 10 );
                        // The window image is scaled down here
                        boolean finished =
                                g.drawImage(winImage, 0, 0, winSize.width, winSize.height/2, null);
                        System.out.println("finished drawing image: " + finished );
                                        
                        //imgG.dispose();
                        g.dispose();

                        job.end();

                }
        } // method print()

    public static void main( String[] args )
        {
                Frame frame = new Frame( "Print Test" );
                PrintTest test = new PrintTest();
                frame.setSize( 200, 200 );
                frame.addWindowListener( new WindowCloser() );
                frame.add( test, "Center" );
                frame.setVisible( true );

    } // method main()


} // PrintTest


class WindowCloser extends WindowAdapter
{
    public void windowClosing( WindowEvent we)
        {
                Window win = we.getWindow();
                win.setVisible(false);
                win.dispose();
                System.exit(0);
    }
} // class WindowCloser

------------

8/27/99 eval1127@eng -- NT gets ClassCastException in sun.aw.image.BufferedImageGraphics2D (Solaris OK);
This is an apparent duplicate of bug # 4189679. The problem still occurs in kestrel-beta (this report was filed against 1.1.7 and 1.1.8). Will change priority and
severity of bug. Also recategorized as classes_2D (from _awt).

Exception occurred during event dispatching:
java.lang.ClassCastException: sun.awt.image.BufferedImageGraphics2D
        at sun.awt.windows.WComponentPeer.print(WComponentPeer.java:111)
        at sun.awt.windows.WCanvasPeer.print(WCanvasPeer.java:60)
        at sun.awt.windows.WPanelPeer.print(WPanelPeer.java:24)
        at java.awt.Component.printAll(Component.java:2106)
        at PrintTest.printWindow(PrintTest.java:77)
        at PrintTest.actionPerformed(PrintTest.java:54)
        at java.awt.Button.processActionEvent(Button.java:333)
        at java.awt.Button.processEvent(Button.java:306)
        at java.awt.Component.dispatchEventImpl(Component.java:2529)
        at java.awt.Component.dispatchEvent(Component.java:2443)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:302)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:95)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:86)

(Review ID: 94511)
======================================================================