Question

我已经能够根据组件的大小缩放字体，但是，我似乎无法弄清楚如何制作图像缩放。我的程序的工作方式是将组件添加到arrayList中，然后在最后设置每个组件的边界。我尝试过这种变化，并且无法让它起作用：

public class ImagePanel extends JPanel implements Updater{
    BufferedImage resizer;
    private int width;
    private int height;
    private JLabel picLabel;
    private BufferedImage myPicture;
    /**
     * Searches for the image in the specified location and sets the background of the ImagePanel to the specified color.
     * @param location
     * @param bGColor
     */
    public ImagePanel(String location, Color bGColor)
    {

        myPicture = null;
        this.setLayout(new BorderLayout());
        try {
            // TODO make it use the string.
            myPicture = ImageIO.read(new File("images/logo-actavis.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        picLabel = new JLabel(new ImageIcon(myPicture));
        add(picLabel,BorderLayout.CENTER);
         this.addComponentListener(new ComponentAdapter() {
                @Override
                /**
                 *  Makes it so it does not stretch out text. Resizes the fonts to scale with the screen width..
                 */
                public void componentResized(ComponentEvent e) {
                    if(picLabel.getHeight()!=0&&picLabel.getWidth()!=0)
                     {
                      width = picLabel.getWidth();
                      height = picLabel.getHeight();
                      myPicture=resize(myPicture, width, height);
                     }

                }
            });


        this.setBackground(bGColor);
    }
    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;
    }
}

Answer 1

您可以使用该方法从原始图像中获取缩放图像

public Image getScaledInstance(int width, int height, int hints)

Answer 2

而不是使用ImageIcon。你可以使用Darryl的Stretch Icon。

图标将根据标签的可用空间自动缩放。您可以按比例放大图像比例，或者让图像填满整个空间。

Answer 3

结束这样做：

     this.addComponentListener(new ComponentAdapter() {
            @Override
            /**
             *  Makes it so it does not stretch out text. Resizes the fonts to scale with the screen width..
             */
            public void componentResized(ComponentEvent e) {
                Double width = (double) e.getComponent().getWidth();
                Double height = (double) e.getComponent().getHeight();
                double scalingFactor=Math.min(width/originalWidth, height/originalHeight)*.7;
                myPicture = myPicture.getScaledInstance((int)(originalWidth*(scalingFactor)),(int) (originalHeight*(scalingFactor)), Image.SCALE_SMOOTH);
                picLabel = new JLabel(new ImageIcon(myPicture));
                add(picLabel,BorderLayout.CENTER);

            }
     });

原始高度/宽度是原始图片的宽高比。我将scalingFactor乘以.7，因为我不希望它填满整个Panel。

调整图像大小以缩小面板位于/ label

3 个答案: