如何在AWT中将图像添加到框架中？

Question

我试过这个，但不起作用。

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.Panel;

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class Gfx
{
  public static void main(String[] args)
  {
    Frame f = new Frame ("Gfx");
    f.addWindowListener (new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          f.dispose (); }});
    Panel p = new Panel ();
    f.add(p);
    BufferedImage image = new BufferedImage(1000, 1000, BufferedImage.TYPE_INT_ARGB);
    p.add(image);
    f.pack();
    f.setVisible (true);
  }
}

错误是:

Gfx.java:21: error: no suitable method found for add(BufferedImage)
    p.add(image);
     ^
    method Component.add(PopupMenu) is not applicable
      (argument mismatch; BufferedImage cannot be converted to PopupMenu)
    method Container.add(Component) is not applicable
      (argument mismatch; BufferedImage cannot be converted to Component)

缓冲图像不是组件。如何将其转换为组件？

Answer 1

如果您想使用AWT绘图，请使用Canvas。在JavaSwing中，您创建了一个绘图JPanel。

我修改了您的代码以创建以下GUI：

我缩小了图片的尺寸，这样图形用户界面更适合答案。

这是完整的可运行代码。

import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

public class Gfx {
    public static void main(String[] args) {
        Frame f = new Frame("Gfx");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                f.dispose();
            }
        });

        Canvas canvas = new Canvas() {
            private static final long serialVersionUID = 1L;

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(200, 200);
            }

            @Override
            public void paint(Graphics g) {
                super.paint(g);
                BufferedImage image = new BufferedImage(200, 200,
                        BufferedImage.TYPE_INT_ARGB);
                g.drawImage(image, 0, 0, this);
            }
        };

        f.add(canvas);
        f.pack();
        f.setVisible(true);
    }
}