/* created by hlr
 * des：重复定义，宽高可能会出bug
 * date：2015-10-20 16:46:06
 * v 1.0
 */ 
(function($){
	$.fn.adpimg=function(options){
		var defaults={
			fillcenter:true,//拉伸时居中
			innerstyle:false,//内填充，false拉伸填充
			doclass:"adpimg"//自定义img容器类名，默认adpimg
		}
		
		var options=$.extend(defaults,options);
		
		var $adpimg=$('.'+options.doclass);
		$adpimg.css({"position":"relative","overflow":"hidden"})
		//作用域 适用于一个div下对应一个img
		$adpimg.each(function(){
			var $_this=$(this);
			var w_adpimg=$_this.width();
			var h_adpimg=$_this.height();
			var pro=w_adpimg/h_adpimg;//比例，大于1表示横矩形。
//			console.log("容器宽高"+w_adpimg+" "+h_adpimg);
			
			var $img=$_this.find("img");
			//作用域 div下每个img
			$img.each(function(){
				var $_thisimg=$(this);
				var w_img=$_thisimg.width();
				var h_img=$_thisimg.height();
				var pro_img=w_img/h_img;
//				console.log("img款高："+w_img+" "+h_img+ " "+pro_img);
				$_thisimg.css({"position":"absolute","left":0,"right":0,"top":0,"bottom":0,"margin":"auto"})
				
				//判断比例,img 宽度自适应
				//内填充，自适应
				if(options.innerstyle){
					if(pro<pro_img){
						$_thisimg.css("width",w_adpimg);
						$_this.css("line-height",h_adpimg+"px");
//						console.log("内填充：widht-adapt")
					}else if(pro>pro_img){
						$_thisimg.css({"height":h_adpimg,"margin":"auto","display":"block"});
//						console.log("内填充：height-adapt")
					}
				}else{
					//内拉伸
					if(pro>pro_img){
						$_thisimg.css("width",w_adpimg);
						$_thisimg.css("height","none");
//						$_this.css("line-height",h_adpimg+"px");
//						console.log("拉伸：widht-adapt")
					}else if(pro<pro_img){
						$_thisimg.css({"height":h_adpimg,"margin":"auto","display":"block"});
						if(options.fillcenter){
							var nw=$_thisimg.width();
							$_thisimg.css("margin-left",-(nw-w_adpimg)/2)+"px";
//							console.log("fillcenter");
						}
//						console.log("拉伸：-height-adapt")
					}
				}
			})
		})
	}
})(jquery)
$(function(){
	$(".adpimg").adpimg();
	$(".adpimgin").adpimg({doclass:'adpimgin',innerstyle:true});
})