Bildeviser kaller paintComponent() to ganger + java.lang.OutOfMemoryError

PelleP · 3. januar 2010

Jeg har eksperimentert litt med en bildeviser (se kode):

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.SwingUtilities;

import javax.swing.filechooser.*;

import java.io.*;

import java.io.File;

import java.beans.*;

public class Ikontest extends JFrame implements ActionListener{

public static void main(String[]args){

Ikontest ik = new Ikontest();

}

ImageFilter imagefilter;

JButton open;

JButton avslutt;

JPanel buttonpanel;

JFileChooser filechooser;

Bildepanel bildepanel;

File file;

Ikontest(){

bildepanel = new Bildepanel();

getContentPane().add(bildepanel, BorderLayout.CENTER);

setTitle("Ikontest");

open = new JButton("Åpne bilde");

open.addActionListener(this);

avslutt = new JButton("Avlsutt");

avslutt.addActionListener(this);

buttonpanel = new JPanel();

buttonpanel.add(open);

buttonpanel.add(avslutt);

add(buttonpanel, BorderLayout.NORTH);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

pack();

setVisible(true);

}

public void actionPerformed(ActionEvent e){

if(e.getSource() == open){

filechooser = new JFileChooser();

filechooser.addChoosableFileFilter(new ImageFilter());

filechooser.setAcceptAllFileFilterUsed(false);

filechooser.setFileView(new ImageFileView());

filechooser.setAccessory(new ImagePreview(filechooser));

int returnval = filechooser.showOpenDialog(this);

if(returnval == JFileChooser.APPROVE_OPTION){

file = filechooser.getSelectedFile();

bildepanel.tegnBilde(file.getPath());

pack();

}else{

}

}else{

System.exit(0);

}

class Bildepanel extends JPanel{

ImageIcon ikon;

String path;

Dimension resolution;

int makswidth;

int maksheight;

int imagewidth;

int imageheight;

Bildepanel(){

resolution = Toolkit.getDefaultToolkit().getScreenSize();

makswidth = resolution.width;

maksheight = resolution.height-40;

}

public void tegnBilde(String path){

this.path = path;

ikon = new ImageIcon(path);

}

public void paintComponent(Graphics g){

imagewidth = ikon.getIconWidth();

imageheight = ikon.getIconHeight();

dimensionPrint();

if(imageheight > maksheight){

imagewidth = imagewidth * maksheight / imageheight;

imageheight = maksheight;

}

if(imagewidth > makswidth){

imageheight = imageheight * makswidth / imagewidth;

imagewidth = makswidth;

dimensionPrint();

}

getPreferredSize();

super.paintComponent(g);

System.out.println("Tegner bilde");

g.drawImage(ikon.getImage(), 0, 0, imagewidth, imageheight, this);

}

public Dimension getPreferredSize(){

if(ikon != null){

return new Dimension(ikon.getIconWidth(), ikon.getIconHeight());

}else{

return new Dimension(600, 800);

}

public void dimensionPrint(){//for test purpouse

double format = ((double)(imagewidth/imageheight));

System.out.println(imagewidth);

System.out.println(imageheight);

System.out.println(format);

}

class Utils{

public final static String jpeg = "jpeg";

public final static String jpg = "jpg";

public final static String gif = "gif";

public final static String tiff = "tiff";

public final static String tif = "tif";

public final static String png = "png";

/*

* Get the extension of a file.

*/

public static String getExtension(File file) {

String ext = null;

String string = file.getName();

int i = string.lastIndexOf('.');

if (i > 0 && i < string.length() - 1){

ext = string.substring(i+1).toLowerCase();

}

return ext;

}

protected static ImageIcon createImageIcon(String path) {

java.net.URL imgURL = Utils.class.getResource(path);

if (imgURL != null) {

return new ImageIcon(imgURL);

} else {

System.err.println("Couldn't find file: " + path);

return null;

}

class ImageFileView extends FileView {

ImageIcon jpgIcon = Utils.createImageIcon("images/jpgIcon.gif");

ImageIcon gifIcon = Utils.createImageIcon("images/gifIcon.gif");

ImageIcon tiffIcon = Utils.createImageIcon("images/tiffIcon.gif");

ImageIcon pngIcon = Utils.createImageIcon("images/pngIcon.png");

public String getName(File f) {

return null; //let the L&F FileView figure this out

}

public String getDescription(File f) {

return null; //let the L&F FileView figure this out

}

public Boolean isTraversable(File f) {

return null; //let the L&F FileView figure this out

}

public String getTypeDescription(File f) {

String extension = Utils.getExtension(f);

String type = null;

if (extension != null) {

if (extension.equals(Utils.jpeg) ||

extension.equals(Utils.jpg)) {

type = "JPEG Image";

} else if (extension.equals(Utils.gif)){

type = "GIF Image";

} else if (extension.equals(Utils.tiff) ||

extension.equals(Utils.tif)) {

type = "TIFF Image";

} else if (extension.equals(Utils.png)){

type = "PNG Image";

}

return type;

}

public Icon getIcon(File f) {

String extension = Utils.getExtension(f);

Icon icon = null;

if (extension != null) {

if (extension.equals(Utils.jpeg) ||

extension.equals(Utils.jpg)) {

icon = jpgIcon;

} else if (extension.equals(Utils.gif)) {

icon = gifIcon;

} else if (extension.equals(Utils.tiff) ||

extension.equals(Utils.tif)) {

icon = tiffIcon;

} else if (extension.equals(Utils.png)) {

icon = pngIcon;

}

return icon;

}

class ImagePreview extends JComponent implements PropertyChangeListener {

ImageIcon thumbnail = null;

File file = null;

public ImagePreview(JFileChooser fc) {

setPreferredSize(new Dimension(100, 50));

fc.addPropertyChangeListener(this);

}

public void loadImage() {

if (file == null) {

thumbnail = null;

return;

}

//Don't use createImageIcon (which is a wrapper for getResource)

//because the image we're trying to load is probably not one

//of this program's own resources.

ImageIcon tmpIcon = new ImageIcon(file.getPath());

if (tmpIcon != null) {

if (tmpIcon.getIconWidth() > 90) {

thumbnail = new ImageIcon(tmpIcon.getImage().

getScaledInstance(90, -1,

Image.SCALE_DEFAULT));

} else { //no need to miniaturize

thumbnail = tmpIcon;

}

public void propertyChange(PropertyChangeEvent e) {

boolean update = false;

String prop = e.getPropertyName();

//If the directory changed, don't show an image.

if (JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(prop)) {

file = null;

update = true;

//If a file became selected, find out which one.

} else if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(prop)) {

file = (File) e.getNewValue();

update = true;

}

//Update the preview accordingly.

if (update) {

thumbnail = null;

if (isShowing()) {

loadImage();

repaint();

}

protected void paintComponent(Graphics g) {

if (thumbnail == null) {

loadImage();

}

if (thumbnail != null) {

int x = getWidth()/2 - thumbnail.getIconWidth()/2;

int y = getHeight()/2 - thumbnail.getIconHeight()/2;

if (y < 0) {

y = 0;

}

if (x < 5) {

x = 5;

}

thumbnail.paintIcon(this, g, x, y);

}

Meningen er at man skal klikke på knappen "åpne bilde" få opp en JFileChooser som man velger et bilde med og bildet skal da tegnes på en JPanel. Deretter kan man velge et nytt bilde.

På min 6-7 år gamle PC som jeg brukte til igår så fungerte det tilfredstillende. Når jeg flytter programmet over til min nye PC så tegnes bildet noen ganger men ikke andre. Jeg får følgende utskrift på skjermen:

Tegner bilde

Tegnet bilde

4000

3000

1.0

1280

960

1.0

Tegner bilde

Tegnet bilde

Exception in thread "Image Fetcher 0" java.lang.OutOfMemoryError: Java heap space

at java.awt.image.DataBufferInt.<init>(DataBufferInt.java:41)

at java.awt.image.Raster.createPackedRaster(Raster.java:458)

at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1015)

at sun.awt.image.ImageRepresentation.createBufferedImage(ImageRepresentation.java:230)

at sun.awt.image.ImageRepresentation.setPixels(ImageRepresentation.java:484)

at sun.awt.image.ImageDecoder.setPixels(ImageDecoder.java:120)

at sun.awt.image.JPEGImageDecoder.sendPixels(JPEGImageDecoder.java:97)

at sun.awt.image.JPEGImageDecoder.readImage(Native Method)

at sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:119)

at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:246)

at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)

at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)