/**
* @classDescription 模拟Marquee，无间断滚动内容
* @author Aken Li(www.kxbd.com)
* @DOM
*      <div id="marquee">
*          <ul>
*               <li></li>
*               <li></li>
*          </ul>
*      </div>
* @CSS
*      #marquee {width:200px;height:50px;overflow:hidden;}
* @Usage
*      $('#marquee').kxbdMarquee(options);
* @options
*    isEqual:true,//所有滚动的元素长宽是否相等,true,false
*      loop: 0,//循环滚动次数，0时无限
*    direction: 'left',//滚动方向，'left','right','up','down'
*    scrollAmount:1,//步长
*    scrollDelay:20//时长
*/
(function($){

    $.fn.kxbdMarquee = function(options){
        var opts = $.extend({},$.fn.kxbdMarquee.defaults, options);
        
        return this.each(function(){
            var $marquee = $(this);//滚动元素容器
            var _scrollObj = $marquee.get(0);//滚动元素容器DOM
            var scrollW = $marquee.width();//滚动元素容器的宽度
            var scrollH = $marquee.height();//滚动元素容器的高度
            var $element = $marquee.children(); //滚动元素
            var $kids = $element.children();//滚动子元素
            var scrollSize=0;//滚动元素尺寸
            var _type = (opts.direction == 'left' || opts.direction == 'right') ? 1:0;//滚动类型，1左右，0上下
            
            //防止滚动子元素比滚动元素宽而取不到实际滚动子元素宽度
            $element.css(_type?'width':'height',1000);
            //获取滚动元素的尺寸
            if (opts.isEqual) {
                scrollSize = $kids[_type?'outerWidth':'outerHeight']() * $kids.length;
            }else{
                $kids.each(function(){
                    scrollSize += $(this)[_type?'outerWidth':'outerHeight']();
                });
            }
            //滚动元素总尺寸小于容器尺寸，不滚动
            if (scrollSize<(_type?scrollW:scrollH)) return; 
            //克隆滚动子元素将其插入到滚动元素后，并设定滚动元素宽度
            $element.append($kids.clone()).css(_type?'width':'height',scrollSize*2);
            
            var numMoved = 0;
            function scrollFunc(){
                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';
                if (opts.loop > 0) {
                    numMoved+=opts.scrollAmount;
                    if(numMoved>scrollSize*opts.loop){
                        _scrollObj[_dir] = 0;
                        return clearInterval(moveId);
                    } 
                }
                if(opts.direction == 'left' || opts.direction == 'up'){
                    _scrollObj[_dir] +=opts.scrollAmount;
                    if(_scrollObj[_dir]>=scrollSize){
                        _scrollObj[_dir] = 0;
                    }
                }else{
                    _scrollObj[_dir] -=opts.scrollAmount;
                    if(_scrollObj[_dir]<=0){
                        _scrollObj[_dir] = scrollSize;
                    }
                }
            }
            //滚动开始
            var moveId = setInterval(scrollFunc, opts.scrollDelay);
            //鼠标划过停止滚动
            $marquee.hover(
                function(){
                    clearInterval(moveId);
                },
                function(){
                    clearInterval(moveId);
                    moveId = setInterval(scrollFunc, opts.scrollDelay);
                }
            );
            
        });
    };
    $.fn.kxbdMarquee.defaults = {
        isEqual:true,//所有滚动的元素长宽是否相等,true,false
        loop: 0,//循环滚动次数，0时无限
        direction: 'left',//滚动方向，'left','right','up','down'
        scrollAmount:1,//步长
        scrollDelay:20//时长

    };
    $.fn.kxbdMarquee.setDefaults = function(settings) {
        $.extend( $.fn.kxbdMarquee.defaults, settings );
    };
})(jQuery);





function enHex(aDigit)
{
return("0123456789ABCDEF".substring(aDigit, aDigit+1))
}
function deHex(aDigit)
{
return("0123456789ABCDEF".indexOf(aDigit))
}

function toHex(n)
{
return (enHex((0xf00000 & n) >> 20) +
enHex((0x0f0000 & n) >> 16) +
enHex((0x00f000 & n) >> 12) +
enHex((0x000f00 & n) >> 8) +
enHex((0x0000f0 & n) >> 4) +
enHex((0x00000f & n) >> 0))
}
function toDecimal(hexNum)
{
var tmp = ""+hexNum.toUpperCase()
while (tmp.length < 6) tmp = "0"+tmp
return ((deHex(tmp.substring(0,1)) << 20) +
(deHex(tmp.substring(1,2)) << 16) + 
(deHex(tmp.substring(2,3)) << 12) +
(deHex(tmp.substring(3,4)) << 8) +
(deHex(tmp.substring(4,5)) << 4) +
(deHex(tmp.substring(5,6))))
}

var hoverColour
var numLinks;
var rate;
var numFadeLevels;
var bgR;
var bgG;
var bgB;
var currR;
var currG;
var currB;
var count;
var fadeOut;
var continuous;
var newColour;
var tID;
var redInterval;
var greenInterval;
var blueInterval;
function initLinks(mouseOverColour, numberOfLinks, fadeOutColour)
{
hoverColour = mouseOverColour;
numLinks = numberOfLinks;
rate = 1;
numFadeLevels = 30;
function initArray(theArray, length, val)
{
for(i=0;i<length;i++)
{
theArray[i] = val;
}
}
bgR = '0000' + fadeOutColour.substring(1,3)
bgG = '0000' + fadeOutColour.substring(3,5)
bgB = '0000' + fadeOutColour.substring(5,7)
currR = new Array(numLinks);
currG = new Array(numLinks);
currB = new Array(numLinks);
count = new Array(numLinks);
fadeOut = new Array(numLinks);
continuous = new Array(numLinks);
newColour = new Array(numLinks);
tID = new Array(numLinks);
redInterval = toDecimal(bgR) / numFadeLevels;
greenInterval = toDecimal(bgG) / numFadeLevels;
blueInterval = toDecimal(bgB) / numFadeLevels;
initArray(currR,numLinks,0);
initArray(currG,numLinks,0);
initArray(currB,numLinks,0);
initArray(count,numLinks,0);
initArray(fadeOut,numLinks,true);
initArray(continuous,numLinks,true);
} 
function startFade(id)
{
if(fadeOut[id] == true)
{ /*move colour towards background colour (increment)*/
currR[id] += redInterval;
currG[id] += greenInterval;
currB[id] += blueInterval;
newColour[id] = '#' + (toHex(currR[id])).substring(4,6) + (toHex(currG[id])).substring(4,6) + (toHex(currB[id])).substring(4,6);
if(++count[id] == numFadeLevels)
{
fadeOut[id] = false;
}
}
else
{
currR[id] -= redInterval;

currG[id] -= greenInterval;

currB[id] -= blueInterval;

newColour[id] = '#' + (toHex(currR[id])).substring(4,6) + (toHex(currG[id])).substring(4,6) + (toHex(currB[id])).substring(4,6);

if(--count[id] == 0)

{

fadeOut[id] = true;

}

}

if(continuous[id] == true)

{

document.getElementById(id).style.color = newColour[id]; 

}

else

{

document.getElementById(id).style.color = hoverColour;

}

clearTimeout(tID[id]);

tID[id]=setTimeout('startFade(' + id + ')', rate);

}

function continueFade(id)

{

continuous[id] = true;

}

function stopFade(id)

{

continuous[id] = false;

}

function StartTimers()

{ 

for(id=0; id<numLinks; id++)

{

t=setTimeout('startFade(' + id + ')', id*100);

}

}


initLinks('#FF0000', 6, '#FFCC77');