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Adapter automatiquement l'ImageIcon à la taille de l'étiquette

Sur mon JFrame, j'utilise le code suivant pour afficher une image sur le panneau:

  ImageIcon img= new ImageIcon("res.png");
  jLabel.setIcon(img);

Je voudrais "redimensionner" l'image dans l'étiquette. En effet, la taille de l’image n’est parfois que de quelques pixels, parfois bien plus.

Existe-t-il un moyen de définir la taille de l'étiquette, puis de redimensionner automatiquement l'image dans l'étiquette?

21
martin8

C'est une question délicate. Vous soulignez le fait que vous utilisez une JLabel pour afficher l'image, ce qui est la méthode standard, mais JLabel est une petite bête complexe, avec alignement et positionnement de texte, d'icône et de texte.

Si vous n'avez pas besoin de toutes ces fonctionnalités supplémentaires, je créerais simplement vous-même un composant personnalisé capable de peindre une image mise à l'échelle ...

La question suivante est la suivante: comment voulez-vous redimensionner l'image? Voulez-vous conserver le rapport hauteur/largeur de l'image? Voulez-vous "adapter" ou "remplir" l'image à l'espace disponible.

@ David a raison. Dans la mesure du possible, évitez Image#getScaledInstance car ce n’est pas le plus rapide, mais surtout, il n’offre pas non plus la meilleure qualité.

Fit vs Fill

enter image description here

L'exemple suivant est plutôt simple (et emprunte beaucoup à ma bibliothèque de code, il est donc probablement aussi un peu compliqué;)). Il pourrait utiliser un fil de mise à l'échelle en arrière-plan, mais je baserais ma décision sur la taille potentielle de l'image d'origine.

public class ResizableImage {

    public static void main(String[] args) {
        new ResizableImage();
    }

    public ResizableImage() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                try {
                    BufferedImage image = ImageIO.read(new File("/path/to/your/image"));

                    JFrame frame = new JFrame("Test");
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setLayout(new BorderLayout());
                    frame.add(new ScalablePane(image));
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (Exception exp) {
                    exp.printStackTrace();
                }
            }
        });
    }

    public class ScalablePane extends JPanel {

        private Image master;
        private boolean toFit;
        private Image scaled;

        public ScalablePane(Image master) {
            this(master, true);
        }

        public ScalablePane(Image master, boolean toFit) {
            this.master = master;
            setToFit(toFit);
        }

        @Override
        public Dimension getPreferredSize() {
            return master == null ? super.getPreferredSize() : new Dimension(master.getWidth(this), master.getHeight(this));
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Image toDraw = null;
            if (scaled != null) {
                toDraw = scaled;
            } else if (master != null) {
                toDraw = master;
            }

            if (toDraw != null) {
                int x = (getWidth() - toDraw.getWidth(this)) / 2;
                int y = (getHeight() - toDraw.getHeight(this)) / 2;
                g.drawImage(toDraw, x, y, this);
            }
        }

        @Override
        public void invalidate() {
            generateScaledInstance();
            super.invalidate();
        }

        public boolean isToFit() {
            return toFit;
        }

        public void setToFit(boolean value) {
            if (value != toFit) {
                toFit = value;
                invalidate();
            }
        }

        protected void generateScaledInstance() {
            scaled = null;
            if (isToFit()) {
                scaled = getScaledInstanceToFit(master, getSize());
            } else {
                scaled = getScaledInstanceToFill(master, getSize());
            }
        }

        protected BufferedImage toBufferedImage(Image master) {
            Dimension masterSize = new Dimension(master.getWidth(this), master.getHeight(this));
            BufferedImage image = createCompatibleImage(masterSize);
            Graphics2D g2d = image.createGraphics();
            g2d.drawImage(master, 0, 0, this);
            g2d.dispose();
            return image;
        }

        public Image getScaledInstanceToFit(Image master, Dimension size) {
            Dimension masterSize = new Dimension(master.getWidth(this), master.getHeight(this));
            return getScaledInstance(
                            toBufferedImage(master),
                            getScaleFactorToFit(masterSize, size),
                            RenderingHints.VALUE_INTERPOLATION_BILINEAR,
                            true);
        }

        public Image getScaledInstanceToFill(Image master, Dimension size) {
            Dimension masterSize = new Dimension(master.getWidth(this), master.getHeight(this));
            return getScaledInstance(
                            toBufferedImage(master),
                            getScaleFactorToFill(masterSize, size),
                            RenderingHints.VALUE_INTERPOLATION_BILINEAR,
                            true);
        }

        public Dimension getSizeToFit(Dimension original, Dimension toFit) {
            double factor = getScaleFactorToFit(original, toFit);
            Dimension size = new Dimension(original);
            size.width *= factor;
            size.height *= factor;
            return size;
        }

        public Dimension getSizeToFill(Dimension original, Dimension toFit) {
            double factor = getScaleFactorToFill(original, toFit);
            Dimension size = new Dimension(original);
            size.width *= factor;
            size.height *= factor;
            return size;
        }

        public double getScaleFactor(int iMasterSize, int iTargetSize) {
            return (double) iTargetSize / (double) iMasterSize;
        }

        public double getScaleFactorToFit(Dimension original, Dimension toFit) {
            double dScale = 1d;
            if (original != null && toFit != null) {
                double dScaleWidth = getScaleFactor(original.width, toFit.width);
                double dScaleHeight = getScaleFactor(original.height, toFit.height);
                dScale = Math.min(dScaleHeight, dScaleWidth);
            }
            return dScale;
        }

        public double getScaleFactorToFill(Dimension masterSize, Dimension targetSize) {
            double dScaleWidth = getScaleFactor(masterSize.width, targetSize.width);
            double dScaleHeight = getScaleFactor(masterSize.height, targetSize.height);

            return Math.max(dScaleHeight, dScaleWidth);
        }

        public BufferedImage createCompatibleImage(Dimension size) {
            return createCompatibleImage(size.width, size.height);
        }

        public BufferedImage createCompatibleImage(int width, int height) {
            GraphicsConfiguration gc = getGraphicsConfiguration();
            if (gc == null) {
                gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
            }

            BufferedImage image = gc.createCompatibleImage(width, height, Transparency.TRANSLUCENT);
            image.coerceData(true);
            return image;
        }

        protected BufferedImage getScaledInstance(BufferedImage img, double dScaleFactor, Object hint, boolean bHighQuality) {
            BufferedImage imgScale = img;
            int iImageWidth = (int) Math.round(img.getWidth() * dScaleFactor);
            int iImageHeight = (int) Math.round(img.getHeight() * dScaleFactor);

            if (dScaleFactor <= 1.0d) {
                imgScale = getScaledDownInstance(img, iImageWidth, iImageHeight, hint, bHighQuality);
            } else {
                imgScale = getScaledUpInstance(img, iImageWidth, iImageHeight, hint, bHighQuality);
            }

            return imgScale;
        }

        protected BufferedImage getScaledDownInstance(BufferedImage img,
                        int targetWidth,
                        int targetHeight,
                        Object hint,
                        boolean higherQuality) {

            int type = (img.getTransparency() == Transparency.OPAQUE)
                            ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;

            BufferedImage ret = (BufferedImage) img;

            if (targetHeight > 0 || targetWidth > 0) {
                int w, h;
                if (higherQuality) {
                    // Use multi-step technique: start with original size, then
                    // scale down in multiple passes with drawImage()
                    // until the target size is reached
                    w = img.getWidth();
                    h = img.getHeight();
                } else {
                    // Use one-step technique: scale directly from original
                    // size to target size with a single drawImage() call
                    w = targetWidth;
                    h = targetHeight;
                }

                do {
                    if (higherQuality && w > targetWidth) {
                        w /= 2;
                        if (w < targetWidth) {
                            w = targetWidth;
                        }
                    }
                    if (higherQuality && h > targetHeight) {
                        h /= 2;
                        if (h < targetHeight) {
                            h = targetHeight;
                        }
                    }

                    BufferedImage tmp = new BufferedImage(Math.max(w, 1), Math.max(h, 1), type);
                    Graphics2D g2 = tmp.createGraphics();
                    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
                    g2.drawImage(ret, 0, 0, w, h, null);
                    g2.dispose();

                    ret = tmp;
                } while (w != targetWidth || h != targetHeight);
            } else {
                ret = new BufferedImage(1, 1, type);
            }

            return ret;
        }

        protected BufferedImage getScaledUpInstance(BufferedImage img,
                        int targetWidth,
                        int targetHeight,
                        Object hint,
                        boolean higherQuality) {

            int type = BufferedImage.TYPE_INT_ARGB;

            BufferedImage ret = (BufferedImage) img;
            int w, h;
            if (higherQuality) {
                // Use multi-step technique: start with original size, then
                // scale down in multiple passes with drawImage()
                // until the target size is reached
                w = img.getWidth();
                h = img.getHeight();
            } else {
                // Use one-step technique: scale directly from original
                // size to target size with a single drawImage() call
                w = targetWidth;
                h = targetHeight;
            }

            do {
                if (higherQuality && w < targetWidth) {
                    w *= 2;
                    if (w > targetWidth) {
                        w = targetWidth;
                    }
                }

                if (higherQuality && h < targetHeight) {
                    h *= 2;
                    if (h > targetHeight) {
                        h = targetHeight;
                    }
                }

                BufferedImage tmp = new BufferedImage(w, h, type);
                Graphics2D g2 = tmp.createGraphics();
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
                g2.drawImage(ret, 0, 0, w, h, null);
                g2.dispose();

                ret = tmp;
                tmp = null;
            } while (w != targetWidth || h != targetHeight);
            return ret;
        }
    }
}
41
MadProgrammer

Est-il possible de définir la taille de l'étiquette

Remplacez getPreferredSize() de JLabel et renvoyez la Dimensions que vous voulez, Mais, étant donné que JLabel redimensionnera lui-même en fonction de son contenu, il vous suffira de redimensionner l'image que vous ajoutez à la JLabel.

et ensuite pour redimensionner automatiquement l'image dans l'étiquette?

Vous devrez redimensionner votre image en fonction de la largeur et de la hauteur souhaitées (ajoutez-la simplement à la variable JLabel et la taille JLabel sera adaptée à l'image).

Je ne recommande pas Image.getScaledInstance(..) avoir une lecture ici pour plus:

Image.getScaledInstance() ne renvoie pas une image finie et mise à l'échelle. Il laisse la majeure partie du travail de mise à l'échelle pour une période ultérieure lorsque l'image est en pixels sont utilisés.

Voici une méthode personnalisée que j'ai utilisée pour contourner les problèmes créés par getScaledInstance:

public static BufferedImage resize(BufferedImage image, int width, int height) {
    BufferedImage bi = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
    Graphics2D g2d = (Graphics2D) bi.createGraphics();
    g2d.addRenderingHints(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
    g2d.drawImage(image, 0, 0, width, height, null);
    g2d.dispose();
    return bi;
}

vous créeriez une image à la taille souhaitée par:

BufferedImage image=ImageIO.read(..);
BufferedImage resizedImage=resize(image,100,100);//resize the image to 100x100
25
David Kroukamp

Vous pouvez également le faire en surchargeant la méthode paintComponent de JLabel et en dessinant le image ayant la largeur et la hauteur égales à celles de JLabel. Et si vous souhaitez redimensionner l'image lorsque le parent container est redimensionné, vous pouvez appliquer le WindowListener sur le conteneur parent et repaint l'instance Jlabel chaque fois que le conteneur parent est redimensionné.

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.SwingUtilities;
import Java.awt.Graphics;
import Java.awt.event.WindowAdapter;
import Java.awt.event.WindowEvent;


public class  LabelDemo extends JFrame
{
    ImageIcon imageIcon;
    MyJLabel jLabel ;
    public LabelDemo ()
    {
        super("JLabel Demo");
    }
    public void createAndShowGUI()
    {
        imageIcon = new ImageIcon("Apple.png");
        jLabel = new MyJLabel(imageIcon);
        getContentPane().add(jLabel);
        addWindowListener( new WindowAdapter()
        {
            public void windowResized(WindowEvent evt)
            {
                jLabel.repaint();
            }
        });
        setSize(300,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        jLabel.repaint();
    }
    public static void main(String st[])
    {
        SwingUtilities.invokeLater( new Runnable()
        {
            @Override
            public void run()
            {
                LabelDemo demo = new LabelDemo();
                demo.createAndShowGUI();
            }
        });
    }
}
class MyJLabel extends JLabel
{
    ImageIcon imageIcon;
    public MyJLabel(ImageIcon icon)
    {
        super();
        this.imageIcon = icon;
    }
    @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        g.drawImage(imageIcon.getImage(),0,0,getWidth(),getHeight(),this);
    }
}
7
Vishal K

Vous pouvez utiliser l’icône Stretch

L'image sera automatiquement redimensionnée pour remplir l'espace disponible pour l'étiquette. Vous pouvez contrôler si l'image est redimensionnée de manière proportionnelle ou si elle remplit complètement la zone.

Utiliser StretchIcon est plus flexible que de faire une peinture personnalisée comme suggéré dans les autres liens, car vous pouvez bénéficier du redimensionnement automatique de tout composant prenant en charge une icône.

StretchIcon.Java:

import Java.awt.Component;
import Java.awt.Container;
import Java.awt.Graphics;
import Java.awt.Graphics2D;
import Java.awt.Image;
import Java.awt.Insets;
import Java.awt.RenderingHints;
import Java.awt.image.BufferedImage;
import Java.awt.image.ImageObserver;
import Java.net.URL;

import javax.swing.ImageIcon;

/**
 * An <CODE>Icon</CODE> that scales its image to fill the component area, excluding any border or insets, optionally maintaining the image's
 * aspect ratio by padding and centering the scaled image horizontally or vertically.
 * <P>
 * The class is a drop-in replacement for <CODE>ImageIcon</CODE>, except that the no-argument constructor is not supported.
 * <P>
 * As the size of the Icon is determined by the size of the component in which it is displayed, <CODE>StretchIcon</CODE> must only be used
 * in conjunction with a component and layout that does not depend on the size of the component's Icon.
 *
 * @version 1.1 01/15/2016
 * @author Darryl
 */
public class StretchIcon extends ImageIcon
{
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    /**
     * Determines whether the aspect ratio of the image is maintained. Set to <code>false</code> to allow th image to distort to fill the
     * component.
     */
    protected boolean         proportionate    = true;

    /**
     * Creates a <CODE>StretchIcon</CODE> from an array of bytes.
     *
     * @param imageData an array of pixels in an image format supported by the AWT Toolkit, such as GIF, JPEG, or (as of 1.3) PNG
     *
     * @see ImageIcon#ImageIcon(byte[])
     */
    public StretchIcon(byte[] imageData)
    {
        super(imageData);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from an array of bytes with the specified behavior.
     *
     * @param imageData an array of pixels in an image format supported by the AWT Toolkit, such as GIF, JPEG, or (as of 1.3) PNG
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(byte[])
     */
    public StretchIcon(byte[] imageData, boolean proportionate)
    {
        super(imageData);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from an array of bytes.
     *
     * @param imageData an array of pixels in an image format supported by the AWT Toolkit, such as GIF, JPEG, or (as of 1.3) PNG
     * @param description a brief textual description of the image
     *
     * @see ImageIcon#ImageIcon(byte[], Java.lang.String)
     */
    public StretchIcon(byte[] imageData, String description)
    {
        super(imageData, description);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from an array of bytes with the specified behavior.
     *
     * @see ImageIcon#ImageIcon(byte[])
     * @param imageData an array of pixels in an image format supported by the AWT Toolkit, such as GIF, JPEG, or (as of 1.3) PNG
     * @param description a brief textual description of the image
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(byte[], Java.lang.String)
     */
    public StretchIcon(byte[] imageData, String description, boolean proportionate)
    {
        super(imageData, description);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the image.
     *
     * @param image the image
     *
     * @see ImageIcon#ImageIcon(Java.awt.Image)
     */
    public StretchIcon(Image image)
    {
        super(image);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the image with the specified behavior.
     *
     * @param image the image
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(Java.awt.Image)
     */
    public StretchIcon(Image image, boolean proportionate)
    {
        super(image);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the image.
     *
     * @param image the image
     * @param description a brief textual description of the image
     *
     * @see ImageIcon#ImageIcon(Java.awt.Image, Java.lang.String)
     */
    public StretchIcon(Image image, String description)
    {
        super(image, description);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the image with the specified behavior.
     *
     * @param image the image
     * @param description a brief textual description of the image
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(Java.awt.Image, Java.lang.String)
     */
    public StretchIcon(Image image, String description, boolean proportionate)
    {
        super(image, description);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified file.
     *
     * @param filename a String specifying a filename or path
     *
     * @see ImageIcon#ImageIcon(Java.lang.String)
     */
    public StretchIcon(String filename)
    {
        super(filename);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified file with the specified behavior.
     *
     * @param filename a String specifying a filename or path
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(Java.lang.String)
     */
    public StretchIcon(String filename, boolean proportionate)
    {
        super(filename);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified file.
     *
     * @param filename a String specifying a filename or path
     * @param description a brief textual description of the image
     *
     * @see ImageIcon#ImageIcon(Java.lang.String, Java.lang.String)
     */
    public StretchIcon(String filename, String description)
    {
        super(filename, description);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified file with the specified behavior.
     *
     * @param filename a String specifying a filename or path
     * @param description a brief textual description of the image
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(Java.awt.Image, Java.lang.String)
     */
    public StretchIcon(String filename, String description, boolean proportionate)
    {
        super(filename, description);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified URL.
     *
     * @param location the URL for the image
     *
     * @see ImageIcon#ImageIcon(Java.net.URL)
     */
    public StretchIcon(URL location)
    {
        super(location);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified URL with the specified behavior.
     *
     * @param location the URL for the image
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(Java.net.URL)
     */
    public StretchIcon(URL location, boolean proportionate)
    {
        super(location);
        this.proportionate = proportionate;
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified URL.
     *
     * @param location the URL for the image
     * @param description a brief textual description of the image
     *
     * @see ImageIcon#ImageIcon(Java.net.URL, Java.lang.String)
     */
    public StretchIcon(URL location, String description)
    {
        super(location, description);
    }

    /**
     * Creates a <CODE>StretchIcon</CODE> from the specified URL with the specified behavior.
     *
     * @param location the URL for the image
     * @param description a brief textual description of the image
     * @param proportionate <code>true</code> to retain the image's aspect ratio, <code>false</code> to allow distortion of the image to
     *            fill the component.
     *
     * @see ImageIcon#ImageIcon(Java.net.URL, Java.lang.String)
     */
    public StretchIcon(URL location, String description, boolean proportionate)
    {
        super(location, description);
        this.proportionate = proportionate;
    }

    /**
     * Paints the icon. The image is reduced or magnified to fit the component to which it is painted.
     * <P>
     * If the proportion has not been specified, or has been specified as <code>true</code>, the aspect ratio of the image will be preserved
     * by padding and centering the image horizontally or vertically. Otherwise the image may be distorted to fill the component it is
     * painted to.
     * <P>
     * If this icon has no image observer,this method uses the <code>c</code> component as the observer.
     *
     * @param c the component to which the Icon is painted. This is used as the observer if this icon has no image observer
     * @param g the graphics context
     * @param x not used.
     * @param y not used.
     *
     * @see ImageIcon#paintIcon(Java.awt.Component, Java.awt.Graphics, int, int)
     */
    @Override
    public synchronized void paintIcon(Component c, Graphics g, int x, int y)
    {
        Image image = getImage();
        if (image == null)
        {
            return;
        }
        Insets insets = ((Container) c).getInsets();
        x = insets.left;
        y = insets.top;

        int w = c.getWidth() - x - insets.right;
        int h = c.getHeight() - y - insets.bottom;

        if (proportionate)
        {
            int iw = image.getWidth(c);
            int ih = image.getHeight(c);

            if ((iw * h) < (ih * w))
            {
                iw = (h * iw) / ih;
                x += (w - iw) / 2;
                w = iw;
            }
            else
            {
                ih = (w * ih) / iw;
                y += (h - ih) / 2;
                h = ih;
            }
        }
        ImageObserver io = getImageObserver();

        /*
         * Added this code to generate nicer looking results when scaling. - bspkrs
         * BEGIN CHANGES
         */
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR);
        Graphics2D g2d = bi.createGraphics();
        g2d.addRenderingHints(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
        g2d.drawImage(image, 0, 0, w, h, io == null ? c : io);
        g2d.dispose();
        /*
         * END CHANGES
         */

        g.drawImage(bi, x, y, w, h, io == null ? c : io);
    }

    /**
     * Overridden to return 0. The size of this Icon is determined by the size of the component.
     *
     * @return 0
     */
    @Override
    public int getIconWidth()
    {
        return 0;
    }

    /**
     * Overridden to return 0. The size of this Icon is determined by the size of the component.
     *
     * @return 0
     */
    @Override
    public int getIconHeight()
    {
        return 0;
    }
}
3
camickr
private Image fitimage(Image img, int w, int h) {
    int width = img.getWidth(this);
    int height = img.getHeight(this);
    BufferedImage resizedimage;

    if (width > w && height > h) {
        resizedimage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = resizedimage.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(img, 0, 0, w, h, null);
        g2.dispose();
    } else {
        resizedimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = resizedimage.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(img, 0, 0, width, height, null);
        g2.dispose();
    }
    return resizedimage;
}
0
Dheeraj Upadhyay

Essayez cette fonction: 

public static BufferedImage resize(BufferedImage image, int width, int height) {
    BufferedImage bi = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
    Graphics2D g2d = (Graphics2D) bi.createGraphics();
    g2d.addRenderingHints(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
    g2d.drawImage(image, 0, 0, width, height, null);
    g2d.dispose();
    return bi;
}

BufferedImage image1=ImageIO.read(url.openStream());
     BufferedImage resizedImage=resize(image,100,100);
     System.out.println("Load image into frame...");
      icon=new ImageIcon(resizedImage);
0
Punit Gupta