/*******************************************************************************************************************
* 函數名稱: taiwanCalendar(yy,mm,dd,act)										                                       *	
* 功能說明: 顯示台灣農曆						   											   						   *
* 傳入參數: yy:年																									   *
*		   mm:月																									   *
*	       dd:日																									   *
*	       act:1:西元2:農曆3:農曆天干地支4:節氣5:牲肖年6:星期幾                                                               *
* 範   例: taiwanCalendar(2009,12,7,3)			                                                                   *								
* 傳 回 值: 農曆顯示值										                                                           *
* 更新日期: 2009/12/07	 																                           *
* 更新人員: 蘇耀坤																                                   *
********************************************************************************************************************/
function taiwanCalendar(yy,mm,dd,act)//
{
   mm =  parseInt(mm) - 1 ;
   showCld(yy,mm);
   return showCldDay((parseInt(dd)+1),act);
}
var cld;
var dateArray = new Array();
var yearMain;//今年什麼年
var lunarInfo=new Array(
0x4bd8,0x4ae0,0xa570,0x54d5,0xd260,0xd950,0x5554,0x56af,0x9ad0,0x55d2,
0x4ae0,0xa5b6,0xa4d0,0xd250,0xd295,0xb54f,0xd6a0,0xada2,0x95b0,0x4977,
0x497f,0xa4b0,0xb4b5,0x6a50,0x6d40,0xab54,0x2b6f,0x9570,0x52f2,0x4970,
0x6566,0xd4a0,0xea50,0x6a95,0x5adf,0x2b60,0x86e3,0x92ef,0xc8d7,0xc95f,
0xd4a0,0xd8a6,0xb55f,0x56a0,0xa5b4,0x25df,0x92d0,0xd2b2,0xa950,0xb557,
0x6ca0,0xb550,0x5355,0x4daf,0xa5b0,0x4573,0x52bf,0xa9a8,0xe950,0x6aa0,
0xaea6,0xab50,0x4b60,0xaae4,0xa570,0x5260,0xf263,0xd950,0x5b57,0x56a0,
0x96d0,0x4dd5,0x4ad0,0xa4d0,0xd4d4,0xd250,0xd558,0xb540,0xb6a0,0x95a6,
0x95bf,0x49b0,0xa974,0xa4b0,0xb27a,0x6a50,0x6d40,0xaf46,0xab60,0x9570,
0x4af5,0x4970,0x64b0,0x74a3,0xea50,0x6b58,0x5ac0,0xab60,0x96d5,0x92e0,
0xc960,0xd954,0xd4a0,0xda50,0x7552,0x56a0,0xabb7,0x25d0,0x92d0,0xcab5,
0xa950,0xb4a0,0xbaa4,0xad50,0x55d9,0x4ba0,0xa5b0,0x5176,0x52bf,0xa930,
0x7954,0x6aa0,0xad50,0x5b52,0x4b60,0xa6e6,0xa4e0,0xd260,0xea65,0xd530,
0x5aa0,0x76a3,0x96d0,0x4afb,0x4ad0,0xa4d0,0xd0b6,0xd25f,0xd520,0xdd45,
0xb5a0,0x56d0,0x55b2,0x49b0,0xa577,0xa4b0,0xaa50,0xb255,0x6d2f,0xada0,
0x4b63,0x937f,0x49f8,0x4970,0x64b0,0x68a6,0xea5f,0x6b20,0xa6c4,0xaaef,
0x92e0,0xd2e3,0xc960,0xd557,0xd4a0,0xda50,0x5d55,0x56a0,0xa6d0,0x55d4,
0x52d0,0xa9b8,0xa950,0xb4a0,0xb6a6,0xad50,0x55a0,0xaba4,0xa5b0,0x52b0,
0xb273,0x6930,0x7337,0x6aa0,0xad50,0x4b55,0x4b6f,0xa570,0x54e4,0xd260,
0xe968,0xd520,0xdaa0,0x6aa6,0x56df,0x4ae0,0xa9d4,0xa4d0,0xd150,0xf252,
0xd520);

var solarMonth=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
var Gan=new Array("甲","乙","丙","丁","戊","己","庚","辛","壬","癸");
var Zhi=new Array("子","丑","寅","卯","辰","巳","午","未","申","酉","戍","亥");
var Animals=new Array("鼠","牛","虎","兔","龍","蛇","馬","羊","猴","雞","狗","豬");
var solarTerm = new Array("小寒","大寒","立春","雨水","驚蟄","春分","清明","榖雨","立夏","小滿","芒種","夏至","小暑","大暑","立秋","處暑","白露","秋分","寒露","降霜","立冬","小雪","大雪","冬至")
var sTermInfo = new Array(0,21208,42467,63836,85337,107014,128867,150921,173149,195551,218072,240693,263343,285989,308563,331033,353350,375494,397447,419210,440795,462224,483532,504758);
var nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十');
var nStr2 = new Array('初','十','廿','卅','卌');
var monthName = new Array("1 月","2 月","3 月","4 月","5 月","6 月","7 月","8 月","9 月","10 月","11 月","12 月");





/*****************************************************************************
                                      日期計算
*****************************************************************************/

//====================================== 傳回農曆 y 年的總天數
function lYearDays(y)
{
	 var i, sum = 348;
	 for(i=0x8000; i>0x8; i>>=1) sum += (lunarInfo[y-1900] & i)? 1: 0;
	 return(sum+leapDays(y));
}

//====================================== 傳回農曆 y 年閏月的天數
function leapDays(y)
{
   if(leapMonth(y))  return((lunarInfo[y-1900] & 0x10000)? 30: 29);
   else return(0);
}

//====================================== 傳回農曆 y 年潤哪個月 1-12 , 沒潤傳回 0
function leapMonth(y)
{
	var lm = lunarInfo[y-1900] & 0xf;
	return(lm==0xf?0:lm);
}

//====================================== 傳回農曆 y 年 m 月總天數
function monthDays(y,m)
{
	return( (lunarInfo[y-1900] & (0x10000>>m))? 30: 29 );
}

//====================================== 算出農曆, 傳入日期物件, 傳回農曆日期物件
//                                       該物件屬性有 .year .month .day .isLeap .yearCyl .dayCyl .monCyl
function Lunar(objDate) {
	var i, leap=0, temp=0;
	var offset   = (Date.UTC(objDate.getFullYear(),objDate.getMonth(),objDate.getDate()) - Date.UTC(1900,0,31))/86400000;
	
	for(i=1900; i<2100 && offset>0; i++) { temp=lYearDays(i); offset-=temp; }
	
	if(offset<0) { offset+=temp; i--; }
	
	this.year = i;
	
	leap = leapMonth(i); 
	this.isLeap = false;
	
	for(i=1; i<13 && offset>0; i++) {
	
	if(leap>0 && i==(leap+1) && this.isLeap==false)
	   { --i; this.isLeap = true; temp = leapDays(this.year); }
	else
	   { temp = monthDays(this.year, i); }
	
	
	if(this.isLeap==true && i==(leap+1)) this.isLeap = false;
	
	offset -= temp;
	}
	
	if(offset==0 && leap>0 && i==leap+1)
	if(this.isLeap)
	   { this.isLeap = false; }
	else
	   { this.isLeap = true; --i; }
	
	if(offset<0){ offset += temp; --i; }
	
	this.month = i;
	this.day = offset + 1;
}

//==============================傳回國曆 y 年某 m+1 月的天數
function solarDays(y,m)
{
	if(m==1)
		return(((y%4 == 0) && (y%100 != 0) || (y%400 == 0))? 29: 28);
	else
		return(solarMonth[m]);
}
//============================== 傳入 offset 傳回干支, 0=甲子
function cyclical(num)
{
   return(Gan[num%10]+Zhi[num%12]);
}

//============================== 月曆屬性
function calElement(sYear,sMonth,sDay,week,lYear,lMonth,lDay,isLeap,cYear,cMonth,cDay) {

      this.isToday    = false;
      //國曆
      this.sYear      = sYear;
      this.sMonth     = sMonth;
      this.sDay       = sDay;
      this.week       = week;
      //農曆
      this.lYear      = lYear;
      this.lMonth     = lMonth;
      this.lDay       = lDay;
      this.isLeap     = isLeap;
      //干支
      this.cYear      = cYear;
      this.cMonth     = cMonth;
      this.cDay       = cDay;

      this.color      = '';

      this.lunarFestival = ''; //農曆節日
      this.solarFestival = ''; //國曆節日
      this.solarTerms    = ''; //節氣

}

//===== 某年的第 n 個節氣為幾日(從 0 小寒起算)
function sTerm(y,n) {
   var offDate = new Date( ( 31556925974.7*(y-1900) + sTermInfo[n]*60000  ) + Date.UTC(1900,0,6,2,5) )
   return(offDate.getUTCDate())
}

//============================== 傳回月曆物件 (y年,m+1月)
function calendar(y,m)
{
   var sDObj, lDObj, lY, lM, lD=1, lL, lX=0, tmp1, tmp2
   var lDPOS = new Array(3)
   var n = 0
   var firstLM = 0

   sDObj = new Date(y,m,1)            //當月一日日期

   this.length    = solarDays(y,m)    //國曆當月天數
   this.firstWeek = sDObj.getDay()    //國曆當月 1 日星期幾
	if(m<2) cY=cyclical(y-1900+36-1);
	else cY=cyclical(y-1900+36);
	var term2=sTerm(y,2); //蕾景
	
	
	var firstNode = sTerm(y,m*2) //殿隙絞堎☆誹★峈撓羲宎
	cM = cyclical((y-1900)*12+m+12);
	
	
	var dayCyclical = Date.UTC(y,m,1,0,0,0,0)/86400000+25567+10;

   for(var i=0;i<this.length;i++)
   {

      if(lD>lX)
	  {
         sDObj = new Date(y,m,i+1)    //當月一日日期
         lDObj = new Lunar(sDObj)     //農曆
         lY    = lDObj.year           //農曆年
         lM    = lDObj.month          //農曆月
         lD    = lDObj.day            //農曆日
         lL    = lDObj.isLeap         //農曆是否閏月
         lX    = lL? leapDays(lY): monthDays(lY,lM) //農曆當月最後一天

         if(n==0) firstLM = lM
         lDPOS[n++] = i-lD+1
      }
		if(m==1 && (i+1)==term2) cY=cyclical(y-1900+36);
		
		if((i+1)==firstNode) cM = cyclical((y-1900)*12+m+13);
		
		cD = cyclical(dayCyclical+i);      
      this[i] = new calElement(y, m+1, i+1, nStr1[(i+this.firstWeek)%7],lY, lM, lD++, lL,cY ,cM, cD);
   }
   //節氣
   tmp1=sTerm(y,m*2  )-1
   tmp2=sTerm(y,m*2+1)-1
   this[tmp1].solarTerms = solarTerm[m*2]
   this[tmp2].solarTerms = solarTerm[m*2+1]
}



///////////////////////////////////////////////////////////////////////////////



function showCld(SY,SM)
{
	var i,sD,s,size;
	cld = new calendar(SY,SM);
	if(SY>1874 && SY<1909) yDisplay = '光緒' + (((SY-1874)==1)?'元':SY-1874)
	if(SY>1908 && SY<1912) yDisplay = '宣統' + (((SY-1908)==1)?'元':SY-1908)
	if(SY>1911) yDisplay = '民國' + (((SY-1911)==1)?'元':SY-1911)
	yearMain = Animals[(SY-4)%12];
	for(i=0;i<42;i++)
	{
		sD = i - cld.firstWeek;
		if(sD>-1 && sD<cld.length)
		{ //日期內
			dateArray[i] = sD + 1;
		}  
	}
}


//////////////////////////////////////////////////////////////////////////////

var width = "130";
var offsetx = 2;
var offsety = 16;

var x = 0;
var y = 0;
var snow = 0;
var sw = 0;
var cnt = 0;



//顯示詳細日期資料
function showCldDay(v,act)
{
	var d=v-2;
	switch(act)
	{
		case 1:
			return cld[d].sYear+'年 '+cld[d].sMonth+'月'+cld[d].sDay+'日 ';
			break;
		case 2:
			return '農曆'+(cld[d].isLeap?'潤 ':' ')+cld[d].lMonth+' 月 '+cld[d].lDay+' 日';
			break;
		case 3:
			return cld[d].cYear+'年 '+cld[d].cMonth+'月'+cld[d].cDay + '日';
			break;
		case 4:
			return cld[d].solarTerms + ' ' + cld[d].solarFestival + ' ' + cld[d].lunarFestival;
			break;
		case 5:
			return yearMain;
			break;		
		case 6:
			return '星期'+cld[d].week;
			break;						
	}
}