JS Tween 顏色漸變

更新時(shí)間：2008年12月30日 15:16:52 作者：

從我寫的as tween改寫的，基本功能跟as里面寫的一樣，只是沒有擴(kuò)展特定功能的接口（比如alpha2，move2，size2，color2等接口,這些在as tween里面都有實(shí)現(xiàn)）。

有31中緩動算法，實(shí)現(xiàn)了顏色的自動轉(zhuǎn)換（#f00 #ff0000 rgb(255,0,0)格式到顏色運(yùn)算格式，最后返回#ff0000格式）、px單位的自動轉(zhuǎn)換。
調(diào)用接口：
/**
* 對外接口
* Tween的示例
* @param startProps 開始屬性，單個(gè)屬性或者數(shù)組
* @param endProps 結(jié)束屬性，單個(gè)屬性或者數(shù)組
* @param timeSeconds 運(yùn)動消耗時(shí)間，單位秒
* @param animType 動作類型，字符串型，內(nèi)部自己轉(zhuǎn)換算子
* @param delay 延遲時(shí)間，多長時(shí)間后開始運(yùn)動，單位秒
*/
window.rtween = function(startProps, endProps, timeSeconds, animType, delay)
{
var tw = new Tween();
tw.start(startProps, endProps, timeSeconds, animType, delay);
return tw;
}
示例如下：
http://img.jb51.net/online/Tween.htm

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1- transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script src="http://img.jb51.net/jslib/jquery/jquery-1.2.6.js" type="text/javascript"></script> <script src="http://img.jb51.net/jslib/jquery/rtween.js" type="text/javascript"></script> </head> <body> <div>     <input type="button" value="alpha2" onclick="alpha2()" />     <input type="button" value="color2" onclick="color2()" />     <input type="button" value="bgcolor2" onclick="bgcolor2()" />     <input type="button" value="width2" onclick="width2()" />     <input type="button" value="left2" onclick="left2()"/>     <select size="1" id="tweentypeSelect" name="select"></select> </div> <div   class="9vutdjp"   id='t' style='width:500px;height:500px;background-color:#00f;color:#ccc;position:absolute;'>     function alpha2()     {         var t = rtween(1,0,1,type);         t.run = function(ps)         {             $('#t').css('opacity',ps);         }         t.complete = function()         {             rtween(0,1,1,type).run = function(ps)             {                 $('#t').css('opacity',ps);             }         }     } </div> <script>     //     var t = rtween(0,0,0.1);     var typeshtml = '';     //     for(var i in t.animTypes)     {         typeshtml+='<option>'+i+'</option>';     }     $('#tweentypeSelect').html(typeshtml);     //     var tag = $('#tweentypeSelect')[0];     var type = tag.options[tag.selectedIndex].text;     $('#tweentypeSelect').change(function(){         type = tag.options[tag.selectedIndex].text;     });     //     function alpha2()     {         var t = rtween(1,0,1,type);         t.run = function(ps)         {             $('#t').css('opacity',ps);         }         t.complete = function()         {             rtween(0,1,1,type).run = function(ps)             {                 $('#t').css('opacity',ps);             }         }     }     function color2()     {         var t=rtween($('#t').css('color'),'#ff0000',1,type);         t.run = function(ps)         {             $('#t').css('color',ps);         }         t.complete = function()         {             rtween($('#t').css('color'),'#ccc',1,type).run = function(ps)             {                 $('#t').css('color',ps);             }         }     }     function bgcolor2()     {         var t=rtween($('#t').css('backgroundColor'),'#ff0000',1,type);         t.run = function(ps)         {             $('#t').css('backgroundColor',ps);         }         t.complete = function()         {             rtween($('#t').css('backgroundColor'),'#0000ff',1,type).run = function(ps)             {                 $('#t').css('backgroundColor',ps);             }         }     }     function width2()     {         var t = rtween($('#t').css('width'),'200px',1,type);         t.run = function(ps)         {             $('#t').css('width',ps);         }         t.complete = function()         {             rtween($('#t').css('width'),'500px',1,type).run = function(ps)             {                 $('#t').css('width',ps);             }         }     }     function left2()     {         var t = rtween($('#t').offset().left+'px','500px',1,type);         t.run = function(ps)         {             $('#t').css('left',ps);         }         t.complete = function()         {             rtween($('#t').css('left'),'10px',1,type).run = function(ps)             {                 $('#t').css('left',ps);             }         }     } </script> </body> </html>

[Ctrl+A 全選注:引入外部Js需再刷新一下頁面才能執(zhí)行]

選擇列表里面的緩動算法，點(diǎn)前面的按鈕，就會以想對的緩動算法運(yùn)動

源代碼： http://img.jb51.net/jslib/jquery/rtween.js
核心代碼:
function Tween()
{
this._frame=20;
//
this._animType = linear;
this._delay = 0;
//
this.run = function(){}
this.complete = function(){}
}
//
Tween.prototype.getValue = function(prop)
{
this._valueType = ”;
if(prop.constructor == Array) return prop;
//
if(typeof(prop) == 'string')
{
if(isColor(prop))
{
this._valueType = ‘color';
return c2a(prop);
}
if(prop.split('px').length>1)
{
this._valueType = ‘px';
return [prop.split('px')[0]];
}
}
return [prop];
}
Tween.prototype.setValue = function(prop)
{
if(this._valueType == ‘color')return a2c(prop);
if(this._valueType == ‘px')return prop[0]+'px';
return prop;
}
Tween.prototype.start = function(startProps, endProps, timeSeconds, animType, delay)
{
if(animType != undefined)this._animType = this.animTypes[animType];
if(delay != undefined)this._delay = delay;
//
this._timeSeconds = timeSeconds;
this._startTimer = new Date().getTime() + this._delay * 1000;
//
this._endProps = this.getValue(endProps);
this._startProps = this.getValue(startProps);
this._currentProps = [];
//
var $this = this;
clearInterval(this._runID);
this._runID = setInterval(
function(){$this._run();}
,this._frame);
}
Tween.prototype.stop = function(state)
{
for(var i in this._startProps)
{
if(Number(state)>0)
this._currentProps[i] = this._endProps[i];
else if(Number(state)<0)
this._currentProps[i] = this._startProps[i];
}
this.callListener();
this.complete();
//
clearInterval(this._runID);
}
Tween.prototype.callListener = function()
{
this.run(this.setValue(this._currentProps));
}
Tween.prototype._run = function()
{
if ( new Date().getTime()- this._startTimer< 0) return;
var isEnd = false;
//
for(var i in this._startProps)
{
this._currentProps[i] = this._animType( new Date().getTime()-this._startTimer,Number(this._startProps[i]),Number(this._endProps[i])-Number(this._startProps[i]),this._timeSeconds * 1000);
//
if(this._startTimer + (this._timeSeconds * 1000) <= new Date().getTime())
{
this._currentProps[i] = this._endProps[i];
isEnd = true;
}
}
//
if(isEnd)this.stop();
else this.callListener();
}

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