Java 油漆组件是';我没打电话
很抱歉,一个可能已经解决的问题,但我已经到处搜索,找不到解决方案。我刚刚发现,不管发生什么,paintComponent都不会被调用,不管我把repaint()放在哪里 我已经尝试了几种不同的方法,并尝试从不同的领域调用它,但不管怎样,它似乎永远不会被调用Java 油漆组件是';我没打电话,java,user-interface,Java,User Interface,很抱歉,一个可能已经解决的问题,但我已经到处搜索,找不到解决方案。我刚刚发现,不管发生什么,paintComponent都不会被调用,不管我把repaint()放在哪里 我已经尝试了几种不同的方法,并尝试从不同的领域调用它,但不管怎样,它似乎永远不会被调用 import java.awt.*; import java.awt.event.*; import java.awt.Component; import javax.swing.*; import javax.swing.BoxLayout
import java.awt.*;
import java.awt.event.*;
import java.awt.Component;
import javax.swing.*;
import javax.swing.BoxLayout;
import javax.swing.event.*;
import java.awt.event.KeyEvent;
import java.util.Scanner;
public class LevelOne extends JPanel implements KeyListener
{
int width = 0;
int height = 0;
int bx = 0;
int hx = 0;
int by = 0;
int hy = 0;
Image joe = new ImageIcon("upgrademan.png").getImage();
ImagePanel2 panel2 = new ImagePanel2(new ImageIcon("levelone.png").getImage());
JFrame frame = new JFrame ("Level One");
public LevelOne()
{
frame.getContentPane().add(panel2);
Game game1 = new Game();
frame.setSize(600, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBackground(Color.WHITE);
frame.pack();
frame.setVisible(true);
levelOne();
requestFocus();
}
public void levelOne()
{
repaint(); // this doesn't call paintComponent below?
}
public void paintComponent(Graphics g)
{
super.paintComponent(g); //draw background color
System.out.println("this enters paintComponent");
g.drawImage(joe,100,100,200,200, null); // this doesn't seem to be drawing
requestFocus();
}
public void keyPressed(KeyEvent e) // all they keyListener methods
{
}
public void keyTyped(KeyEvent e)
{
}
public void keyReleased(KeyEvent e)
{
}
}
class ImagePanel2 extends JPanel { // this entire class simply exists to call in order to set a picture as a background
Image img;
public ImagePanel2(String img) { // just sets img in method to class img variable
this(new ImageIcon(img).getImage());
}
public ImagePanel2(Image img) { // sets size of picture
this.img = img;
Dimension dims = new Dimension(600,600);
setPreferredSize(dims);
setMinimumSize(dims);
setMaximumSize(dims);
setSize(dims);
setLayout(null);
}
public void paintComponent(Graphics g) { // draws image
g.drawImage(img, 0, 0, this);
}
}
我期望ImagePanel类打印一个背景,它确实打印了,但我也期望名为joe的图像打印,它没有打印。显示“joe”的唯一位置是LevelOne实例的paintComponent()方法。但您从未将LevelOne实例添加到您的框架或该框架中的任何面板。我真的不明白您的意思,我需要做什么?