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Skalieren Sie das ImageIcon automatisch auf die Etikettengröße

Auf meinem JFrame verwende ich den folgenden Code, um ein Bild im Panel anzuzeigen:

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

Ich möchte das Bild in der Beschriftung "auto-size". In der Tat beträgt die Bildgröße manchmal nur wenige Pixel, manchmal sogar mehr.

Gibt es eine Möglichkeit, die Größe des Etiketts festzulegen und anschließend das Bild im Etikett automatisch zu skalieren?

21
martin8

Das ist eine knifflige Frage. Sie heben die Tatsache hervor, dass Sie eine JLabel verwenden, um das Bild anzuzeigen. Dies ist die Standardmethode, aber JLabel ist ein komplexes kleines Tier mit Text, Symbol und Textausrichtung und -positionierung.

Wenn Sie nicht all diese zusätzlichen Funktionen benötigen, würde ich einfach eine benutzerdefinierte Komponente erstellen, mit der ein skaliertes Bild gezeichnet werden kann.

Die nächste Frage ist, wie Sie das Bild skalieren möchten. Möchten Sie das Seitenverhältnis des Bildes beibehalten? Möchten Sie das Bild an den verfügbaren Platz "anpassen" oder "füllen".

@David ist richtig. Sie sollten, wo möglich, Image#getScaledInstance meiden, da es nicht der schnellste ist, aber was noch wichtiger ist, im Allgemeinen bietet es auch nicht die höchste Qualität.

Fit vs Fill

enter image description here

Das folgende Beispiel ist ziemlich simpel (und entlehnt meine Codebibliothek, daher ist es wahrscheinlich auch etwas verworren;)). Es könnte von einem Hintergrund-Skalierungsthread aus verwendet werden, aber ich würde die Entscheidung auf die mögliche Größe des Originalbilds stützen.

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

Gibt es eine Möglichkeit, die Größe des Etiketts festzulegen

Überschreiben Sie getPreferredSize() von JLabel und geben Sie die gewünschte Dimensions zurück Da sich jedoch eine JLabel an den Inhalt anpasst, müssen Sie nur das Bild ändern, das Sie der JLabel hinzufügen.

und dann das Bild im Etikett automatisch zu verkleinern?

Sie müssen die Größe Ihres Bildes entsprechend der gewünschten Breite und Höhe ändern (dann fügen Sie es einfach der Variablen JLabel hinzu und die Variable JLabel wird an das Bild angepasst).

Ich empfehle Image.getScaledInstance(..) nicht, hier mehr zu lesen:

Image.getScaledInstance() gibt kein fertiges, skaliertes Bild zurück. Es Ein Großteil der Skalierungsarbeit bleibt für einen späteren Zeitpunkt erhalten, wenn die Bildpixel werden verwendet.

Hier ist eine benutzerdefinierte Methode, die ich verwendet habe, um die von getScaledInstance erstellten Probleme zu umgehen:

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;
}

sie erstellen ein Bild in beliebiger Größe über:

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

Sie können dies auch tun, indem Sie die paintComponent-Methode von JLabel überschreiben und die image mit Breite und Höhe als JLabel zeichnen. Wenn Sie die Größe des Bildes ändern möchten, wenn die Größe des übergeordneten container geändert wird, können Sie die WindowListener auf den übergeordneten Container und repaint die Jlabel-Instanz jedes Mal anwenden, wenn der übergeordnete Container seine Größe ändert. Hier ist die Demo:

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

Sie können das Stretch-Symbol verwenden. 

Das Bild wird automatisch in der Größe angepasst, um den für das Etikett verfügbaren Platz zu füllen. Sie können steuern, ob das Bild proportional skaliert wird oder den Bereich vollständig ausfüllt.

Die Verwendung der Variable StretchIcon ist flexibler als das Anfertigen von benutzerdefinierten Bildern, wie in den anderen Links vorgeschlagen, da Sie von der automatischen Größenanpassung einer Komponente profitieren können, die ein Symbol unterstützt.

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

Versuchen Sie diese Funktion: 

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