【发布时间】：2013-04-09 13:36:54
【问题描述】：
我正在开发一个小程序，我没有这方面的经验.. 我想绘制两个对象，插入图像并将背景颜色更改为黑色。如果我不改变颜色，一切正常，当我决定改变背景颜色时问题就来了。 我得到的是没有图纸和图片的黑屏。如果我最小化或重新调整窗口大小，那么我会得到一切。 下面是我的代码，简化版。
import javax.swing.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class JAlienHunt extends JApplet implements ActionListener {
private JButton button = new JButton();
JLabel greeting = new JLabel("Welcome to Alien Hunt Game!");
JLabel gameOverMessage = new JLabel(" ");
JPanel displayPanel = new JPanel(new GridLayout(2, 4));
private int[] alienArray = new int[8];
int countJ = 0, countM = 0;
private ImageIcon image = new ImageIcon("earth.jpg");
private int width, height;
Container con = getContentPane();
Font aFont = new Font("Gigi", Font.BOLD, 20);
public void init() {
/** Setting the Layout and adding the content. */
width = image.getIconWidth();
height = image.getIconHeight();
greeting.setFont(aFont);
greeting.setHorizontalAlignment(SwingConstants.CENTER);
con.setLayout(new BorderLayout());
con.add(greeting, BorderLayout.NORTH);
con.add(displayPanel, BorderLayout.CENTER);
/** Add Buttons to the Applet */
displayPanel.add(button);
String text = Integer.toString(i+1); // convert button # to String adding 1.
buttons.setText(text);
buttons.addActionListener(this);
}
public void actionPerformed(ActionEvent event) {
/** Shows the Alien representing the selected button and deactivate the button. */
if(event.getSource() == buttons)
button.setText("Jupiterian");
else
buttons[i].setText("Martian");
button.setEnabled(false);
con.remove(greeting);
displayPanel.remove(button);
displayPanel.setLayout(new FlowLayout());
gameOverMessage.setHorizontalAlignment(SwingConstants.CENTER);
con.add(gameOverMessage, BorderLayout.NORTH);
repaint();
}
public void paint(Graphics gr) {
super.paint(gr);
/** Condition when user loses the game. Two Jupiterians will be painted on the screen*/
Jupiterian jupit = new Jupiterian();
displayPanel.setBackground(Color.BLACK);
gameOverMessage.setFont(new Font ("Calibri", Font.BOLD, 25));
gameOverMessage.setText("The Earth has been destroyed!");
jupit.draw(gr, 250, 120);
gr.copyArea(190, 40, 465, 300, 500, 0);
gr.drawImage(image.getImage(), 400, 400, width, height, this); //+
}
}
---------------- Jupiterian 类的方法 draw()
public void draw(Graphics g, int x, int y) {
g.setColor(Color.WHITE);
g.drawOval(x, y, 160, 160); // Body of the alien
g.drawLine(x, y + 80, x - 40, y + 170); // Left hand
g.drawLine(x - 40, y + 170, x - 40, y + 180); // Left hand fingers
g.drawLine(x - 40, y + 170, x - 55, y + 180);
Font aFont = new Font ("Chiller", Font.BOLD, 30); // Description text.
g.setFont(aFont);
g.drawString(toString(), 230, 60);
}
--- 抽象类
public abstract class Aliena {
protected String name;
protected String planet;
/** Constructor for the class. Creates the Alien object with the parameters provided */
public Aliena(String nam, int eyes, String hair, String plan){
name = nam;
planet = plan;
}
/** Method that returns a String with a complete description of the Alien. */
public String toString(){
String stringAlien = "I am " + name + " from " + planet;
return stringAlien;
}
}
提前致谢！
【问题讨论】：
-
什么是
Jupiterian和con- 如果您在paint方法中设置ContentPane的背景颜色，那么不要 -
如需尽快获得更好的帮助，请发帖SSCCE。
-
Jupiterian 是一个用于创建绘图的类。基本上我想画一个圆圈。我创建了对象，然后调用它的 draw() 方法来绘制圆。那我应该在哪里改变颜色呢？
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请务必添加@MadProgrammer（或其他人）以通知他们有新评论。那么，没有SSCCE？在这个问题开放期间，我已经帮助了一些将 SSCCE 发布到成功解决方案的人..
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我在我的问题上设置了 SSCCE。 @MadProgrammer