Adjust ScrollPane

What's the difference?

What is DisplayCanvas class?

If you want further help post a Short, Self Contained, Compilable and Executable, Example Program ([url http://homepage1.nifty.com/algafield/sscce.html]SSCCE[/url]) that demonstrates the problem.

And don't forget to use code formatting when posting code:

http://forum.java.sun.com/help.jspa?sec=formatting

Rodney_McKaya at 2007-7-10 3:30:25 >

Use setDefaultCloseOperation(JDialog.EXIT_ON_CLOSE);

instead of registering a window listener to do this.

Here is the updated code:

import java.awt.BorderLayout;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Point;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionAdapter;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

public class Try extends JFrame{

JPanel all = new JPanel(new BorderLayout());

JPanel main = new JPanel(new BorderLayout());

DisplayCanvas canvas;

JScrollPane scroll;

JButton btn1;

public Try(){

super("Testing");

setResizable(false);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

canvas = new DisplayCanvas();

scroll = new JScrollPane(new JLabel(new ImageIcon("contain.jpg")));

scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

main.add(scroll, BorderLayout.CENTER);

canvas.setOpaque(false);

all.add(main,BorderLayout.CENTER);

all.setBounds(55,82,240,319);

setContentPane(new JLabel(new ImageIcon("myBorder.gif")));

getContentPane().add(canvas);

getContentPane().add(all);

pack();

setVisible(true);

}

public static void main(String args[]){

new Try();

}

class DisplayCanvas extends JPanel{

BufferedImage bi;

AffineTransform at;

double x;

DisplayCanvas(){

setBounds(55,105,239,295);

addMouseMotionListener(new MouseMotionHandler());

BufferedImage image = null;

try {

image = ImageIO.read(new File("line.gif"));

} catch (IOException e) {

System.out.println("Make sure image line.jpg is in the same directory");

System.exit(0);

}

bi = new BufferedImage(image.getWidth(),image.getHeight(),BufferedImage.TYPE_INT_ARGB);

Graphics2D big = bi.createGraphics();

big.drawImage(image,0,0,this);

at = new AffineTransform();

at.translate(getWidth()/2, getHeight()/2);

}

public void paintComponent(Graphics g){

super.paintComponent(g);

Graphics2D g2D = (Graphics2D)g;

AffineTransform saveXform = g2D.getTransform();

// at.rotate(Math.toRadians(5));

at.rotate(Math.toRadians(x));

AffineTransform toCenterAt = new AffineTransform();

toCenterAt.concatenate(at);

toCenterAt.translate(-(getWidth()/2),-(getHeight()/2));

g2D.transform(toCenterAt);

g2D.drawImage(bi,150,200,this);

g2D.setTransform(saveXform);

}

class MouseMotionHandler extends MouseMotionAdapter{

public void mouseDragged(MouseEvent e){

x = 5;

Point viewPosition = scroll.getViewport().getViewPosition();

repaint();

if (viewPosition.y < scroll.getViewport().getViewSize().height-scroll.getSize().height-1)

viewPosition.y++;

scroll.getViewport().setViewPosition(viewPosition);

}

}

}

}

Rodney_McKaya at 2007-7-10 3:30:25 >