Java 更改每个时钟滴答声的背景色
我试图在这个数字时钟的每一个滴答声上添加一个变化的背景色,但我不知道从哪里开始。这是我代码中的勾号部分Java 更改每个时钟滴答声的背景色,java,eclipse,swing,Java,Eclipse,Swing,我试图在这个数字时钟的每一个滴答声上添加一个变化的背景色,但我不知道从哪里开始。这是我代码中的勾号部分 public void start() { if ( runner==null) runner =new Thread(this); runner.start(); } public void run() { while(runner==Thread.currentThread()) { repaint(); try {Threa
public void start()
{
if ( runner==null) runner =new Thread(this);
runner.start();
}
public void run()
{
while(runner==Thread.currentThread())
{
repaint();
try {Thread.sleep(1000);}
catch(InterruptedException e) {}
}
}
其他信息(如果有帮助):
public Clockclass()
{
super ("javaclock"); setSize(300,100);
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
setVisible(true);
clockFont= new Font("Serif", Font.BOLD,50);
Container contentArea =getContentPane();
ClockPanel timeDisplay = new ClockPanel();
contentArea.add(timeDisplay);
setContentPane(contentArea);
start();
}
class ClockPanel extends JPanel
{
public void paintComponent (Graphics painter)
{
painter.setColor(Color.cyan);
painter.fillRect(0,0,300,100);
painter.setFont(clockFont);
painter.setColor(Color.white);
painter.drawString(timeNow(), 60, 40);
}
}
public String timeNow(){
Calendar now =Calendar.getInstance();
int hrs=now.get(Calendar.HOUR_OF_DAY);
int min=now.get(Calendar.MINUTE);
int sec=now.get(Calendar.SECOND);
String time= zero(hrs)+":"+zero(min)+":"+zero(sec);
return time;
}
public String zero(int num)
{
String number= (num<10)?("0"+num):(""+num);
return number;
}
公共时钟类()
{
超级(“javaclock”);设置大小(300100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(真);
clockFont=新字体(“衬线”,字体粗体,50);
容器contentArea=getContentPane();
ClockPanel timeDisplay=新的ClockPanel();
添加(时间显示);
setContentPane(contentArea);
start();
}
类ClockPanel扩展了JPanel
{
公共虚空绘制组件(图形绘制器)
{
painter.setColor(Color.cyan);
painter.fillRect(0,0300100);
painter.setFont(clockFont);
油漆工.设置颜色(颜色.白色);
画师.拉丝(timeNow(),60,40);
}
}
公共字符串timeNow(){
Calendar now=Calendar.getInstance();
int hrs=now.get(日历小时);
int min=now.get(Calendar.MINUTE);
int sec=now.get(Calendar.SECOND);
字符串时间=零(小时)+“:”+零(分钟)+“:”+零(秒);
返回时间;
}
公共字符串零(int num)
{
String number=(num除非您必须使用javax.swing.Timer
,否则它将在事件调度线程内执行tick事件通知
这将允许您通过直接传入颜色或自动调整颜色,简单地在时钟面板中提供新颜色或触发颜色更改
您应该始终调用super。paintComponent
paintComponent
也应该受到保护
,任何主体都没有理由在类上下文之外调用
请查看以了解更多详细信息
例如
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Clock {
public static void main(String[] args) {
new Clock();
}
public Clock() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private int count;
public TestPane() {
Timer timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
count++;
repaint();
}
});
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(count % 2 == 0 ? Color.RED : Color.YELLOW);
int dimeter = Math.min(getWidth(), getHeight());
int x = (getWidth() - dimeter) / 2;
int y = (getHeight()- dimeter) / 2;
g2d.fillOval(x, y, dimeter, dimeter);
g2d.dispose();
}
}
}