我正在尝试使用jPanel和jFrame在Java中进行图像滚动。我在drawQuestion类中绘制了我的图像,然后向jScrollPanel添加了drawQuestion,并且它不滚动。请告诉我我的错误在哪里,我一直在寻找几天,我仍然无法找到它。 对不起,我的英语不好。Java JPanel不会滚动
main.java:
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class main{
private static int width = 800;
private static int height = 450;
public static void main(String[] args){
JFrame window = new JFrame("DPA Physics 2013 9 class");
drawQuestion question = new drawQuestion();
JScrollPane scroll = new JScrollPane(question);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setSize(width,height);
window.setLocationRelativeTo(null);
window.add(scroll);
window.setVisible(true);
}
}
drawQuestion.java:
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
public class drawQuestion extends JPanel{
private static final long serialVersionUID = 1L;
public void paintComponent(Graphics g){
super.paintComponent(g);
Image image1 = new ImageIcon(this.getClass().getResource("Page1.png")).getImage();
g.drawImage(image1,0,0,this);
}
}
1)'drawQuestion'应该被称为'DrawQuestion'或者更好的'DrawableQuestion',它应该*返回一个与图像大小相同的首选大小。* 2)Image image1 = new ImageIcon (this.getClass()。getResource(“Page1.png”))。getImage();应该在面板创建时加载图像,或者在构造函数中传递给面板。 3)更容易的是在滚动窗格中的“JLabel”中显示图像。 [E.G.](http://stackoverflow.com/a/13463684/418556) – 2013-04-27 07:00:07