java实现时钟表盘教程方法

心已赠人 2024-03-23 09:58 22阅读 0赞

本文实例为大家分享了java实现时钟表盘的具体代码，供大家参考，具体内容如下

设计并实现一个模拟时钟功能的应用程序。程序中应显示时针、分针和秒针，并同时以数字形式显示当前时间。

实现结果：

![在这里插入图片描述][fd2b0ef16e53405fb4560ca297ede4fb.png]  
源代码如下：

//ClockPanel.java  
import javax.swing.*;  
import java.util.Calendar;  
import java.util.GregorianCalendar;  
import java.util.Timer;  
import java.util.TimerTask;  
import java.text.SimpleDateFormat;  
import java.util.Locale;  
import java.awt.*;  
import java.awt.event.\*;

public class ClockPanel extends JPanel\{  
private GregorianCalendar calendar;  
private JButton btn;  
private JButton btn2;  
private int currentState=8;  
private String zone;  
private int hourTemp;  
final int X=320, Y=240, R=120; // 圆心坐标，半径  
private int xPos,yPos;  
private int hour,minute,second;  
private int xHour,yHour,xMinute,yMinute,xSecond,ySecond;//表针位置（大端）  
private int xHour1,yHour1,xMinute1,yMinute1,xSecond1,ySecond1;//表针位置（小端）  
private double a\_sec,a\_min ,a\_hour;//角度

ClockPanel() {   // 创建定时器对象
        Timer t = new Timer();  
        Task task = new Task();  
        t.schedule(task, 0, 1000); 
        setLayout(new BorderLayout(10,20)); 
        btn=new JButton("时区  上");
        btn2=new JButton("时区 下");
        btn.setBorder(BorderFactory.createRaisedBevelBorder());
        btn2.setBorder(BorderFactory.createRaisedBevelBorder());
        btn.setBackground(Color.green);
        btn2.setBackground(Color.green);
        btn.addActionListener(new ButtonListener()); 
        btn2.addActionListener(new ButtonListener()); 
        add(btn,BorderLayout.WEST); 
        add(btn2,BorderLayout.EAST); 
    }
    //相关事件处理
    private class ButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {    
    
            if (event.getSource()==btn)
                currentState++;
            if (event.getSource()==btn2)
                currentState--;
        }
    
    }
    
    public void paintComponent(Graphics g){ 
        super.paintComponent(g); 
        double alfa;    //所画点对应的角度
        Graphics2D g2d=(Graphics2D)g;
        BasicStroke bstroke=new BasicStroke(1.0f);
        BasicStroke bstroke2=new BasicStroke(2.0f);
        BasicStroke bstroke3=new BasicStroke(3.0f);
    
        g2d.setStroke(bstroke2);
        for(int i=0;i<=360;i+=6)  {
            alfa=Math.toRadians(i);  //角度用弧度表示
            xPos=X+(int)(R*Math.cos(alfa));   // x坐标
            yPos=Y-(int)(R*Math.sin(alfa));   // y坐标
            int xBegin=320+(int)(144*Math.sin(alfa));
            int yBegin=240-(int)(144*Math.cos(alfa));
            int xEnd=320+(int)(159*Math.sin(alfa));
            int yEnd=240-(int)(159*Math.cos(alfa));
    
            g2d.setColor(Color.BLACK);
            g2d.drawLine(xBegin,yBegin,xEnd,yEnd);
    
            g2d.setColor(Color.RED);
            switch(i){  // 写时钟数字刻度
                case 0: g2d.drawString("3", xPos,yPos);
                        break;
                case 90: g2d.drawString("12", xPos,yPos);
                        break;
                case 180: g2d.drawString("9", xPos,yPos);
                        break;
                case 270: g2d.drawString("6",xPos,yPos);
                        break;      
            }
    
            if(i%30==0){
                g2d.drawLine(xBegin,yBegin,xEnd,yEnd);
            }
    
        }
    
    
        g2d.setColor(Color.BLACK);
        g2d.setStroke(bstroke3);
        g2d.drawLine(X, Y, xHour,yHour);    // 画时针
        g2d.drawLine(X, Y, xHour1,yHour1);  
        g2d.setColor(Color.BLUE);
        g2d.setStroke(bstroke2);
        g2d.drawLine(X, Y, xMinute,yMinute);    // 画分针
        g2d.drawLine(X, Y, xMinute1,yMinute1);
        g2d.setColor(Color.RED);
        g2d.setStroke(bstroke);
        g2d.drawLine(X, Y, xSecond,ySecond);    // 画秒针
        g2d.drawLine(X, Y, xSecond1,ySecond1);
        //表盘中心点1
        g2d.drawOval(317,237,6,6); 
        g2d.fillOval(317,237,6,6);
        //表盘中心点2
        g2d.setColor(Color.BLACK);
        g2d.drawOval(319,238,4,4); 
        g2d.fillOval(319,238,4,4);
        //表盘中心圆环
        g2d.setColor(Color.ORANGE);
        g2d.drawOval(300,220,40,40); 
        g2d.setColor(Color.black);
        g2d.drawString("15010140079",290,376); 
    
        GregorianCalendar gre=new GregorianCalendar(); 
        SimpleDateFormat dateforamt1=new SimpleDateFormat("yyyy年MM月dd日E");
        //SimpleDateFormat dateforamt2=new SimpleDateFormat("H时m分s秒");
        g2d.setColor(Color.black);
        g2d.setFont(new Font("SAN_SERIF",Font.BOLD,20)); 
        g2d.drawString(dateforamt1.format(gre.getTime()),250,50);
    
        g2d.drawString(hour+"时"+minute+"分"+second+"秒",260,430);
        //时区判断
        if(currentState>12){
            currentState=-11;
        }
        else if(currentState<-11){
            currentState=12;
        }
        if(currentState<=12&&currentState>=1)
            zone="东"+currentState+"区";
        else
            zone="西"+(1-currentState)+"区";
        g2d.drawString(zone,170,50); 
    
    }
    
    class Task extends TimerTask {  
        public void run() {  
            calendar = new GregorianCalendar();  
            hourTemp=currentState>0?(currentState-8):(currentState-1);
            hour = calendar.get(Calendar.HOUR)+hourTemp;  
            minute = calendar.get(Calendar.MINUTE);  
            second = calendar.get(Calendar.SECOND); 
    
            a_sec = second * 2 * Math.PI / 60;
            a_min = minute * 2 * Math.PI / 60 + a_sec / 60;
            a_hour = hour * 2 * Math.PI / 12 + a_min / 12;
            // 计算时、分、秒针的末端位置
            xSecond=320+(int)(110*Math.sin(a_sec));
            ySecond=240-(int)(110*Math.cos(a_sec));
            xMinute=320+(int)(90 *Math.sin(a_min));
            yMinute=240-(int)(90 *Math.cos(a_min));
            xHour=  320+(int)(70 *Math.sin(a_hour));
            yHour=  240-(int)(70 *Math.cos(a_hour));
            xSecond1=320-(int)(22*Math.sin(a_sec));
            ySecond1=240+(int)(22*Math.cos(a_sec));
            xMinute1=320-(int)(15*Math.sin(a_min));
            yMinute1=240+(int)(15*Math.cos(a_min));
            xHour1  =320-(int)(5 *Math.sin(a_hour));
            yHour1  =240+(int)(5 *Math.cos(a_hour));
    
            repaint();  
        }  
    }

//  
//Clock.java  
import javax.swing.\*;

public class Clock\{  
public static void main(String\[\] args) \{  
JFrame frame=new JFrame(“Clock”); //创建图文框  
frame.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);  
frame.getContentPane().add(new ClockPanel()); //添加面板  
frame.setVisible(true);  
frame.setSize(640,480);  
\}  
\}  
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

[fd2b0ef16e53405fb4560ca297ede4fb.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/23/71bc6e2f21e949999fbf83c0b2cadfcd.png