我有一个任务是显示带有菜单按钮的涂色“眼睛”,以更改其颜色和背景颜色。接下来为它们设置动画。但是目前我一直坚持绘画,在我的JFrame中,我创建了JPanel,其中包含带有绘制的眼睛和按钮的面板。按钮已正确渲染,但未显示我的眼睛画布。我尝试将paint更改为paintComponent,以不同的方式设置contentPane,但仍然无济于事。
import java.awt.*;
import javax.swing.*;
public class Main extends JFrame {
public static void main(String[] args) {
final JFrame frame = new JFrame("Eyes");
frame.setPreferredSize(new Dimension(600, 450));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel players = new JPanel(new GridLayout(1, 3));
players.add(new JButton("Eyes color"));
players.add(new JButton("Eye pupil"));
players.add(new JButton("Background color"));
JPanel eyes = new JPanel();
Eyes e = new Eyes();
eyes.add(e);
eyes.setPreferredSize(new Dimension(600, 400));
JPanel content = new JPanel();
content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
frame.setContentPane(content);
content.add(players);
content.add(eyes);
// frame.getContentPane().add(content);
frame.pack();
frame.setVisible(true);
}
}
class Eyes extends JPanel {
public Eyes(){
}
public void paint(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
BasicStroke bs = new BasicStroke(3.0f);
g2d.setBackground(Color.green);
g2d.setStroke(bs);
g2d.setColor(Color.yellow);
g2d.fillOval(50, 150, 200, 200);
g2d.fillOval( 350, 150, 200, 200);
g2d.setColor(Color.BLACK);
g2d.drawOval(49, 149, 201, 201);
g2d.drawOval(349, 149, 201, 201);
g2d.fillOval(125, 225, 50, 50);
g2d.fillOval(425, 225, 50, 50);
}
}
这就是我应该得到的:
alt text http://img175.imageshack.us/img175/6420/eyes1.jpg
这就是我所拥有的:
alt text http://img132.imageshack.us/img132/827/eyes2i.jpg
当我尝试直接在JFrame中绘画它时,除了没有设置背景之外,它几乎可以完美地工作。为什么setBackgroundColor不会以任何方式影响我的绘图?
最佳答案
Eyes
类已经是一个面板。您不需要这个附加面板:JPanel eyes = new JPanel();
使它像这样:
Eyes eyes = new Eyes();
eyes.setPreferredSize(new Dimension(600, 400));
JPanel content = new JPanel();
content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
frame.setContentPane(content);
content.add(players);
content.add(eyes);
您也可以使其与其他面板一起使用。只需设置
e
面板的首选大小即可。JPanel eyes = new JPanel();
Eyes e = new Eyes();
eyes.add(e);
e.setPreferredSize(new Dimension(600, 400));
eyes.setPreferredSize(new Dimension(600, 400));