ledclock.java

一个用JAVA编写的日历

package java1;
import java.applet.*;
import java.awt.*;
import java.util.Date;

public class ledclock extends Applet implements Runnable
{ 
  Graphics g;
  Thread my_thread;
  int width;
  int height;
  int x,y,xold,yold,xreset,yreset;
  int year;
  int month;
  Panel p;
  boolean response,all;
  Font font;
  FontMetrics fontmetrics;
  AudioClip clip;
  Date current_time,old_time,month_to_show;
 String string="中国民用航空学院计算机学院030341A";
 public void init() //获得需要的初始参数
 { 
     g=getGraphics();
     current_time=new Date();
     year=current_time.getYear();
     month=current_time.getMonth();
     month_to_show=new Date(year,month,1);
    old_time=current_time;
     set_defaults();
     response=false;
     all=true;
     clip=getAudioClip(getCodeBase(),"spacemusic.au");
     Font font=new Font("TimesRoman" ,Font.BOLD,height/15);//设置字体
     g.setFont(font);
     FontMetrics font_metrics=g.getFontMetrics();
     p=new Panel();//设置控制面板
     p.add(new Button ("<"));
     p.add(new Label("CALENDAR"));
     p.add(new Button (">"));
     p.add(new Button ("reset"));
     p.setLocation(0,height*2/6+50);
     add(p);
 }
   public boolean handleEvent(Event evt)//处理鼠标的按下事件
   {
       switch(evt.id)
       {
           case Event.MOUSE_DOWN:
           all=true;
           response=true;
           clip.loop();
           get_sel1(evt.x,evt.y);//对鼠标的按下坐标进行处理
           break;
           default:super.handleEvent(evt);
           
       }
       return true;
       
   }
    public boolean action(Event evt,Object arg)//对按钮动作作响应
    {
        if(arg.equals("<"))
        {
            all=true;
            if(--month<0)
            { month=11;
              year--;
              
        }
    }
        if(arg.equals(">"))
      
        {
            all=true;
            if(++month>11)
            { month=1;
              year++;
              
        }
    }
     
        if(arg.equals("reset"))
        {
          all=true;
         response=false;
         xold=xreset;
         yold=yreset;
         month_to_show=new Date();
         month_to_show=new Date(month_to_show.getYear(),month_to_show.getMonth(),1);
        }//设置新的要显示的date参数
        else 
            month_to_show=new Date(year,month,1);
        repaint();
        return true;
    }
    void set_defaults()//设置高和宽
    { width=size().width ;
      height=size().height;
      x=width;
      y=height/6;
    }
   public void start()//启动线程
    { if(my_thread==null)
     
      { my_thread=new Thread(this);
          my_thread.start();
      }
   }
    public void stop()//线程结束
    {
       my_thread.stop();
        my_thread=null;
    }
   public void run()
   { 
       while(my_thread!=null)
     {
         repaint();
         x-=10;//更新活动字串的显示位置的X坐标
         if(x<10)
             x=width;
         try{
             Thread.sleep(200);//每0.2s更新一次
         }
         catch(InterruptedException e){ }
     }
   }
   public void update(Graphics g)
   { current_time=new Date();//获得新时间，更新新参数
     int hours=current_time.getHours();
     int minutes=current_time.getMinutes();
     int seconds=current_time.getSeconds();
     int old_second=old_time.getSeconds();
     if(all==true)
     {
         all=false;
         g.setColor(Color.blue);
         g.fillRect(0,0,width,height);//更新背景
         
     }
     else
     {   g.setColor(Color.blue);
         g.fillRect(0,height/6,width,height/10);
     }
     if(old_second!=seconds){
         String time;
         if(hours<10)
             time="0"+hours;
         else
             time=""+hours;
         if(minutes<10)
             time=time+":0"+minutes;
         else
             time=time+":"+minutes;
            if(seconds<10)
             time=time+":0"+seconds;
         else
             time=time+":"+seconds;
         g.setColor(Color.blue);
         g.fillRect(0,0,width,height/12);
         g.setColor(Color.green);
        old_second=seconds;//改变旧的时间
     }
     g.setColor(Color.red);
     y=height/6+30;
     g.drawString(string,x,y);
     g.drawString(month_name(month_to_show.getMonth())+"  "+(1900+month_to_show.getYear()),width/2-40,height/6+60);
        y=height/6+80;
        for(int i=0;i<7;i++)
            g.drawString(day_of_week(i),((width)*i)/7+10,y);
        int first=month_to_show.getDay();
        int last=number_of_days(month_to_show.getMonth(),month_to_show.getYear());//输出该月的每一天
        int day=first;
         y=height/6+100;
         g.setColor(Color.white);
          for(int i=0;i<=last;i++)
        {
            g.drawString(""+i,((width)*day)/7+10,y);
            if(++day>6)
            {day=0;
             y+=height/10;
            }
        }
         g.setColor(Color.red);
         if(response==false)
          get_sel2(first,height/6+85);
          g.draw3DRect(xold,yold,width/16,height/19,false);
       }
          public void paint(Graphics g)
          { set_defaults();
            update(g);
            
          }
       public void get_sel1(int x,int y)//处理鼠标按下的坐标，转换成画框的位置参数
       {
         Graphics  gg=getGraphics();
         int inter_x=x;
         int inter_y=y;
         int x1=0;
         int y1=height/6+85;
         int dx=width/7;
         int dy=height/10;
        if(inter_y<y1);
        else
        {while(inter_y>y1+dy)
             y1=y1+dy;
         while(inter_x>x1+dx)
             x1=x1+dx;
        }
         response=true;
         xold=x1;
         yold=y1;
       }
       public void get_sel2(int firstday,int y0)
       { int today=get_today();//得到今天是几号
         int yy,xx;
         Graphics g1=g;
         yy=0;
         xx=0;
         if(firstday==0)//如果第一天是星期天
         {
             yy=(today-1)/7;//获得应在日历上的第几行，第几列画框
             xx=today-yy*7-1;
         }
         else
          if(firstday!=0)
          {  yy=(today+firstday-1)/7;
             xx=(today+firstday)-yy*7-1; 
          
         }
         yy=y0+yy*height/10;
         xx=xx*width/7;
         xreset=xx;
         yreset=yy;
         xold=xx;
         yold=yy;
       }
       int get_today()
       {
           String inter =current_time.toString();//将时间转化为字符串
           int string_length=inter.length();
           char char_arry[]=new char[string_length];
           inter.getChars(0,string_length,char_arry,0);
           int k,b;
           k=char_arry[8]-'0';
           b=char_arry[9]-'0';
           return k*10+b;
       }
       String day_of_week(int day)//获得星期的名称
       {
           switch(day)
           {   case 0:return("日");
               case 1:return("一");
               case 2:return("二");
               case 3:return("三");
               case 4:return("四");
               case 5:return("五");
            default:return("六");
       } 
       }
   
       String month_name(int month)//获得月份的名称
       {
               switch(month)
           { 
               case 0:return("一月");
               case 1:return("二月");
               case 2:return("三月");
               case 3:return("四月");
               case 4:return("五月");
               case 5:return("六月");
               case 6:return("七月");
               case 7:return("八月");
               case 8:return("九月"); 
               case 9:return("十月" );
               case 10:return("十一月" );
               default:return("十二月");
       }
       }
      int number_of_days(int month,int year)
      { switch (month+1)
        {   case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:return(31);
            case 4:
            case 6:
            case 9:
            case 11:return(30);
            default://对2月要判断是否闰年
                if(year%4!=0) return(28);
                else if (year%100!=0) return(29);
                 else if (year%400!=0) return(28);
                 else return(29);
                  }
      
       
    }
}