基本上,当我单击稳定按钮时,我的 Belisha 信标必须保持橙色,但在我的程序中,当我单击稳定按钮时,信标保持浅灰色。有人可以指出我哪里出了问题吗?非常感谢:)。这是我的代码:
package Homework;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.Timer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class BelishaBeacon {
private static Timer timer;
public class Drawing extends JPanel {
private int x = 125;
private int y = 80;
private boolean changeColors = false;
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
Rectangle box1 = new Rectangle(165, 180, 20, 45);
Rectangle box2 = new Rectangle(165, 225, 20, 45);
Rectangle box3 = new Rectangle(165, 270, 20, 45);
Rectangle box4 = new Rectangle(165, 315, 20, 45);
Rectangle box5 = new Rectangle(165, 360, 20, 45);
Rectangle box6 = new Rectangle(165, 405, 20, 45);
Ellipse2D.Double ball = new Ellipse2D.Double(x, y, 100, 100);
g2.draw(ball);
g2.draw(box1);
g2.draw(box2);
g2.draw(box3);
g2.draw(box4);
g2.draw(box5);
g2.draw(box6);
g2.setColor(Color.BLACK);
g2.fill(box1);
g2.fill(box3);
g2.fill(box5);
g2.setColor(Color.ORANGE);
g2.fill(ball);
changeColors = !changeColors;
if (changeColors) {
g2.setColor(Color.lightGray);
g2.fill(new Ellipse2D.Double(x, y, 100, 100));
}
}
public void changeColors() {
changeColors = true;
repaint();
}
}
public BelishaBeacon() {
JFrame frame = new JFrame();
frame.setSize(350, 570);
frame.setTitle("Belisha Beacon");
frame.setLayout(new BorderLayout(0, 0));
final Drawing shapes = new Drawing();
timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
shapes.repaint();
}
});
JButton jbtFlash = new JButton("Flash");
jbtFlash.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Flashing");
if (!timer.isRunning()) {
timer.start();
}
}
});
final JButton jbtSteady = new JButton("Steady");
jbtSteady.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
timer.stop();
}
});
JPanel controlPanel = new JPanel();
controlPanel.setLayout(new GridLayout(1, 2, 0, 0));
controlPanel.add(jbtFlash);
controlPanel.add(jbtSteady);
frame.add(controlPanel, BorderLayout.SOUTH);
frame.add(shapes);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
new BelishaBeacon();
timer.start();
}
}
最佳答案
不要尝试在paintComponent()
中切换颜色,而是给Drawing
一个Color
并使用它渲染球:
private Color color = Color.lightGray;
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
…
g2.setColor(color);
g2.fill(ball);
…
}
让changeColors()
真正改变颜色:
public void changeColors() {
if (Color.orange.equals(color)) {
color = Color.lightGray;
} else {
color = Color.orange;
}
repaint();
}
并添加一个 makeSteady()
方法:
public void makeSteady() {
color = Color.orange;
repaint();
}
现在,您的计时器操作可以执行 shapes.changeColors()
,您的 Flash 按钮处理程序可以执行 timer.restart()
您的 Steady 按钮处理程序可以执行以下操作:
timer.stop();
shapes.makeSteady();
另外,不要忘记invokeLater()
.
关于java - Belisha Beacon 程序中的 JButton 查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36651192/