Question

我正在尝试调整ImageIcon的大小并在GridBagLayout JPanel中使用它。它确实调整了大小......但它仍然以全尺寸显示。因此，您在较大的图像内部有一个调整大小的图像。任何人都看到下面的代码明显错误？谢谢！

public CharacterPage(WikiDB db) throws IOException {
    super("Character Page");

    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    setSize(new Dimension(1000,1000));

    rootPanel.setLayout(new GridBagLayout());
    final GridBagConstraints c = new GridBagConstraints();
    rootPanel.setSize(new Dimension(500,500));

   searchButton.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {

            BufferedImage img1 = null;

                for (int x = 0; x < characterImages.size(); x++){
                    String imageURL = "http://cosplayidol.otakuhouse.com/wp- 
                           content/uploads/2012/06/s-1-1.jpg"

                    try
                    {
                        URL url1 = new URL(imageURL);

                        URLConnection conn1 = url1.openConnection();
                        conn1.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
                        InputStream in1 = conn1.getInputStream();

                        img1 = ImageIO.read(in1);
                    } catch (IOException ioe)
                    {
                        ioe.printStackTrace();
                    }


                }

                Graphics2D g2 = img1.createGraphics();
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, 
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                g2.drawImage(img1, 0,0,100, 100, null);
                g2.dispose();

                ImageIcon newIcon = new ImageIcon(img1);

                c.fill = GridBagConstraints.HORIZONTAL;

                JLabel cIcon = new JLabel(newIcon);
                c.gridx = 0;
                c.gridy = 6;
                rootPanel.add(cIcon,c);
               }
          });

       setContentPane(rootPanel);
    pack();
    setVisible(true);
      }

Answer 1

Graphics2D g2 = img1.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, 
    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(img1, 0, 0, 100, 100, null);
g2.dispose();

应该是这样的：

int w = 100;
int h = 100;
// create an image of the appropriate size!
BufferedImage img2 = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = img2.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, 
    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(img1, 0, 0, w, h, null);
g2.dispose();

Answer 2

这些线将调整后的图像重新绘制在原始图像上：

Graphics2D g2 = img1.createGraphics();
g2.drawImage(img1, 0,0,100, 100, null);

绘制从rootPanel本身创建的图形。

图像在GridBagLayout中没有正确调整大小

2 个答案: