在applet中绘制缓冲图像

时间:2012-02-23 15:35:22

标签: java swing graphics applet paintcomponent

我要做的是将已缓冲的图像绘制到JFrame。

JFrame p1=new JFrame();
p1.getContentPane();
p1.setSize(new Dimension(h,w));
p1.setVisible(true);
p1.update(bufferedImage.getGraphics());

这是到目前为止的代码。 bufferedImage 是一个缓冲图像,但此代码仅打开JFrame并且不绘制图像。我以前从未使用过图形。感谢

2 个答案:

答案 0 :(得分:2)

1)将BufferedImage作为Icon添加到JLabel

2)不要直接在JFrame放置JComponent / JPanel

答案 1 :(得分:1)

请参阅此工作代码:

public static void main(String[] args) throws Exception {
    BufferedImage buf=null;
    try {
        buf = ImageIO.read(new File("estbest.jpg"));
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    new ImageFrame(buf, "Input Image ");
}

ImageFrame类:

public class ImageFrame extends JFrame {
    BufferedImage image;

    public ImageFrame(final BufferedImage image) {
        this(image, "No Title");
    }

    public ImageFrame(final BufferedImage image, final String title) {
        this.image = image;
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                if (image != null) {
                    setSize(image.getWidth(null), image.getHeight(null));
                } else {
                    setSize(250, 90);
                }
                setTitle(title);
                setVisible(true);
                repaint();
            }
        });
    }

    public void paint(Graphics g) {
        if (image == null) {
            g.setColor(Color.BLACK);
            g.fillRect(0, 0, 250, 90);
            System.out.println("image null");
            g.setFont(new Font("Arial", Font.BOLD, 24));
            g.setColor(Color.RED);
            g.drawString("Invalid or No Image", 10, 50);
        } else {
            g.drawImage(image, 0, 0, null);
        }
    }
}

来源:Java: Loading images in JFrame - Reusable ImageFrame