Java 小程序中的背景图像
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Background Images in Java Applets
提问by Ethan Webster
How do you set a background image in Java Applets?
如何在 Java Applets 中设置背景图像？
Let's say I want background.gif to be the background in my java applet class but how would I do this?
假设我希望 background.gif 成为我的 java applet 类中的背景，但我该怎么做？
回答by confucius
I dont think there is a function to do this. But you can extend a Panel (which can act as a simple container of components) and override the paint method to draw an image in the background.
The following is a sample program. Hope this helps.
我不认为有一个功能可以做到这一点。但是你可以扩展一个 Panel（它可以作为一个简单的组件容器）并覆盖paint方法在背景中绘制图像。
下面是一个示例程序。希望这可以帮助。
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.io.IOException.*;
public class BackgroundApplet extends Applet {
Image backGround;
public void init() {
// set the size of the applet to the size of the background image.
// Resizing the applet may cause distortion of the image.
setSize(300, 300);
// Set the image name to the background you want. Assumes the image
// is in the same directory as the class file is
backGround = getImage(getCodeBase(), "save.GIF");
BackGroundPanel bgp = new BackGroundPanel();
bgp.setLayout(new FlowLayout());
bgp.setBackGroundImage(backGround);
// Add the components you want in the Applet to the Panel
bgp.add(new Button("Button 1"));
bgp.add(new TextField("isn't this cool?"));
bgp.add(new Button("Useless Button 2"));
// set the layout of the applet to Border Layout
setLayout(new BorderLayout());
// now adding the panel, adds to the center
// (by default in Border Layout) of the applet
add(bgp);
}
}
class BackGroundPanel extends Panel {
Image backGround;
BackGroundPanel() {
super();
}
public void paint(Graphics g) {
// get the size of this panel (which is the size of the applet),
// and draw the image
g.drawImage(getBackGroundImage(), 0, 0,
(int)getBounds().getWidth(), (int)getBounds().getHeight(), this);
}
public void setBackGroundImage(Image backGround) {
this.backGround = backGround;
}
private Image getBackGroundImage() {
return backGround;
}
}
