clockcanvas.java

指针式电子时钟 有日期和星期显示 可以设置闹钟

import java.io.IOException;
import java.util.Calendar;
import java.util.TimeZone;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class ClockCanvas extends Canvas implements Runnable {
     private Image source;
     private Image copy;
     private Calendar cal;
     private int imageWidth, imageHeight;
     private int screenWidth, screenHeight; 
     private int hourLength = 36, minuteLength = 50, secLength = 58; 
     private int hour = 0, minute = 0, second = 0;  //当前时间
     private int hx, hy; //时针坐标
    
     public ClockCanvas() {
         try { 
             source = Image.createImage("/Clock.png");
             copy = Image.createImage(this.getWidth(), this.getHeight());
             Graphics g = copy.getGraphics();
       
             imageWidth = source.getWidth();
             imageHeight = source.getHeight();
             screenWidth = this.getWidth();
             screenHeight = this.getHeight();
             TimeZone tz = TimeZone.getTimeZone("GMT+8:00");
             cal = Calendar.getInstance();
             

             g.drawImage(source, (screenWidth - imageWidth) / 2, 
                         (screenHeight - imageHeight) / 2, 
                          Graphics.TOP | Graphics.LEFT);
       
         } catch (IOException e) {
             e.printStackTrace();
         }
         Thread t = new Thread(this);
         t.start();
     }
    
     protected void paint(Graphics g) {
         g.drawImage(copy, 0, 0, Graphics.TOP | Graphics.LEFT);
         g.setColor(0, 0, 0);
         g.drawString(cal.getTime().toString(),0,0, Graphics.TOP | Graphics.LEFT);
         
         second = (second + 1) % 60; 
      
         double secangle = Math.PI * second / 30;
         int sx = screenWidth / 2 + (int) (secLength * Math.sin(secangle));
         int sy = screenHeight / 2 - (int) (secLength * Math.cos(secangle));
         //画秒针
         g.setColor (0,0,0);
         g.drawLine(sx, sy, screenWidth / 2, screenHeight / 2);
    
         if (second % 60 == 0) {
             minute = (minute + 1) % 60;
         }
      
         double minangle = Math.PI * minute / 30;
         int mx = screenWidth / 2 + (int) (minuteLength * Math.sin(minangle));
         int my = screenHeight / 2 - (int) (minuteLength * Math.cos(minangle));
         //画分针
         g.setColor(0,0,0);
         g.drawLine(mx, my, screenWidth / 2, screenHeight / 2);
      
         if (minute % 60 == 0) {
             hour = (hour + 1) % 12;
         }
      
         double hourangle = Math.PI * hour / 6 + Math.PI * minute / 360;
         hx = screenWidth / 2 + (int) (hourLength * Math.sin(hourangle));
         hy = screenHeight / 2 - (int) (hourLength * Math.cos(hourangle));
         //画时针
         g.setColor (0,0,0);
         g.drawLine(hx, hy, screenWidth / 2, screenHeight / 2);
     }
    
     public void run() {
         hour = cal.get(Calendar.HOUR);
         minute = cal.get(Calendar.MINUTE);
         second = cal.get(Calendar.SECOND);
      
         while (true) {
             cal = Calendar.getInstance (TimeZone.getTimeZone("GMT+8:00"));
             repaint();
             try {
                 Thread.sleep(1000);
             } catch (InterruptedException e) {
                 e.printStackTrace();
             }
         }
     }
}