var class = {
	create: function() {
	
		return function() {
		this.initialize.apply(this, arguments);
		}
	}
}

object.extend = function(destination, source) {
	for (var property in source) {
	destination[property] = source[property];
	}
	return destination;
}

var transformview = class.create();
transformview.prototype = {
//容器对象,滑动对象,切换参数,切换数量
initialize: function(container, slider, parameter, count, options) {
	if(parameter <= 0 || count <= 0) return;
	var ocontainer = $2(container), oslider = $2(slider), othis = this;
	
	this.index = 0;//当前索引
	
	this._timer = null;//定时器
	this._slider = oslider;//滑动对象
	this._parameter = parameter;//切换参数
	this._count = count || 0;//切换数量
	this._target = 0;//目标参数
	
	this.setoptions(options);
	
	this.up = !!this.options.up;
	this.step = math.abs(this.options.step);
	this.time = math.abs(this.options.time);
	this.auto = !!this.options.auto;
	this.pause = math.abs(this.options.pause);
	this.onstart = this.options.onstart;
	this.onfinish = this.options.onfinish;
	
	ocontainer.style.overflow = "hidden";
	ocontainer.style.position = "relative";
	
	oslider.style.position = "absolute";
	oslider.style.top = oslider.style.left = 0;
},
//设置默认属性
setoptions: function(options) {
	this.options = {//默认值
	up: true,//是否向上(否则向左)
	step: 5,//滑动变化率
	time: 10,//滑动延时
	auto: true,//是否自动转换
	pause: 3000,//停顿时间(auto为true时有效)
	onstart: function(){},//开始转换时执行
	onfinish: function(){}//完成转换时执行
};
object.extend(this.options, options || {});
},
//开始切换设置
start: function() {
if(this.index < 0){
this.index = this._count - 1;
} else if (this.index >= this._count){ this.index = 0; }

this._target = -1 * this._parameter * this.index;
this.onstart();
this.move();
},
//移动
move: function() {
cleartimeout(this._timer);
var othis = this, style = this.up ? "top" : "left", inow = parseint(this._slider.style[style]) || 0, istep = this.getstep(this._target, inow);
if (istep != 0) {
this._slider.style[style] = (inow + istep) + "px";
this._timer = settimeout(function(){ othis.move(); }, this.time);
} else {
this._slider.style[style] = this._target + "px";
this.onfinish();
if (this.auto) { this._timer = settimeout(function(){ othis.index++; othis.start(); }, this.pause); }
}
},
//获取步长
getstep: function(itarget, inow) {
var istep = (itarget - inow) / this.step;
if (istep == 0) return 0;
if (math.abs(istep) < 1) return (istep > 0 ? 1 : -1);
return istep;
},
//停止
stop: function(itarget, inow) {
cleartimeout(this._timer);
this._slider.style[this.up ? "top" : "left"] = this._target + "px";
}
};