javascript 图片裁剪

学php gd库看到有图片裁剪正好整一个嗯其实挺简单的

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>clip</title> <style type="text/css"> *{ padding:0; margin:0;} ul{ list-style-type:none; overflow:hidden; zoom:1; width:1000px; margin:30px auto; } li{ float:left; width:500px;} #container{width:480px; height:480px; margin:0 auto; border:1px solid #999; position:relative;background:url(http://images.cnblogs.com/likecs_com/wtcsy/192373/r_xx.jpg);} #container .block{height:100px; width:100px; border:1px solid #000000; position:absolute; left:50px; top:50px; background:#fff;filter:alpha(opacity=30);opacity:0.3; cursor:move;} #container .tips{ position:absolute; padding:5px; border:1px solid #ccc;background:#fff;filter:alpha(opacity=60);opacity:0.6; display:none; font-size:12px; color:#333; ;} .tips span{ display:inline-block;zoom:1; width:28px;} .rRightDown,.rLeftDown,.rLeftUp,.rRightUp,.rRight,.rLeft,.rUp,.rDown{ position:absolute;background:#f00;width:6px;height:6px;z-index:5;font-size:0;} .rLeftDown,.rRightUp{cursor:ne-resize;} .rRightDown,.rLeftUp{cursor:nw-resize;} .rRight,.rLeft{cursor:e-resize;} .rUp,.rDown{cursor:n-resize;} .rRightDown{ bottom:-3px; right:-3px;} .rLeftDown{ bottom:-3px; left:-3px;} .rRightUp{ top:-3px; right:-3px;} .rLeftUp{ top:-3px; left:-3px;} .rRight{ right:-3px; top:50%} .rLeft{ left:-3px; top:50%} .rUp{ top:-3px; left:50%} .rDown{ bottom:-3px; left:50%} #imgC{ border:1px solid #CCC; width:0; height:0; margin:0 auto;background:url(http://images.cnblogs.com/likecs_com/wtcsy/192373/r_xx.jpg);} .code { background: none repeat scroll 0 0 #E3F4F9; border: 1px solid #BAE2F0; font: 12px "Courier New",Courier,monospace; margin: 30px auto; padding: 10px 10px 40px; width:980px; } .code p{ height:24px; line-height:24px;} .code span{ display:inline-block;zoom:1; margin-right:5px; width:85px; font-weight:bold; color:#00F} </style> </head> <body> <div class="code"> <div class="how">使用方法</div> <p>$("#container").clip({ imgC : $("#imgC"), blockClass : "block", tipsClass : "tips" });</p> <p><span>imgC :</span> 表示裁剪图片的容器,也就是右边的图</p> <p><span>blockClass :</span> block的样式名也就是页面上的可以拖动的滑块的样式因为怕和别的页面上的样式重名默认是block</p> <p><span>tipsClass :</span> tips的样式名也就是页面上显示left width height top的那个span的样式名默认是tips</p> </div> <ul> <li> <div id="container"></div> </li> <li> <div id="imgC"></div> </li> </ul> <script type="text/javascript" src="http://common.cnblogs.com/script/jquery.js"></script> <script type="text/javascript"> (function(){ var dBody = document.body, dDoc = document.documentElement, ie = $.browser.msie; ie&&($.browser.version=="6.0") &&document.execCommand("BackgroundImageCache", false, true); var clip = function(options){ this.init.call(this,options); } clip.prototype = { options :{ moveCallBack : function(){}, blockClass : "block", tipsClass : "tips" }, init : function(options){ $.extend(this,this.options,options||{}); if(!this.container || !this.imgC){ return; } this.container = $(this.container); var self = this; this.block = $(\'<div class="\'+this.blockClass+\'">\ <div action="rightDown" class="rRightDown"></div>\ <div action="leftDown" class="rLeftDown"></div>\ <div action="rightUp" class="rRightUp"></div>\ <div action="leftUp" class="rLeftUp"></div>\ <div action="right" class="rRight"></div>\ <div action="left" class="rLeft"></div>\ <div action="up" class="rUp"></div>\ <div action="down" class="rDown" ></div>\ </div>\') .bind("mousedown.r",function(e){self.start(e)}) .appendTo(this.container[0]); this.tips = $(\'<span class="\'+this.tipsClass+\'" />\').appendTo(this.container[0]); this.setImg(); }, setImg : function(){ var block = this.block; var left = block.css("left"), top = block.css("top"), height = block.height(), width = block.width(); this.imgC.css({ height: height, width : width, "background-position" : "-"+left+" -"+top }); this.tips.html("left:<span>"+parseInt(left) + "</span>top:<span>" + +parseInt(top) + "</span>width:<span>"+width+ "</span>height:<span>"+height+"</span>"); }, start : function(e){ var $elem = $(e.target), block = this.block, self = this, move = false, container = this.container, action = $elem.attr("action"); //这个每次都要计算基本dom结构的改变浏览器的缩放都会让里面的值发生改变 this.offset = $.extend({height:container.height(),width:container.width()},container.offset()); this.blockOriginal = {height:block.height(),width:block.width(),left:parseInt(block.css("left")),top:parseInt(block.css("top"))}; if(action){ this.fun = this[action]; }else{ this.x = e.clientX - this.offset.left - this.blockOriginal.left ; this.y = e.clientY - this.offset.top - this.blockOriginal.top; move = true; } ie &&this.block[0].setCapture(); this.tips.show(); $(document) .bind("mousemove.r",function(e){self.move(e,move)}) .bind("mouseup.r",function(){self.end()}); }, end : function(){ $(document) .unbind("mousemove.r") .unbind("mouseup.r"); ie &&this.block[0].releaseCapture(); this.tips.hide(); }, move : function(e,isMove){ window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); var block = this.block; if(isMove){ var left = Math.max(0,e.clientX - this.offset.left - this.x); left = Math.min(left,this.offset.width - this.blockOriginal.width); var top = Math.max(0,e.clientY - this.offset.top - this.y); top = Math.min(top,this.offset.height - this.blockOriginal.height); block.css({left:left,top:top}); }else{ var offset = this.fun(e); block.css(offset); } this.setImg(); this.moveCallBack(); }, down : function(e){ var blockOriginal = this.blockOriginal, sTop = Math.max(dBody.scrollTop,dDoc.scrollTop), //出现垂直方向滚动条时候要计算这个 offset = this.offset; if(e.clientY-offset.top>=blockOriginal.top-sTop){ var height = Math.min(offset.height - blockOriginal.top,e.clientY-offset.top-blockOriginal.top+sTop), top = blockOriginal.top; }else{ var height = Math.min(offset.top+blockOriginal.top-e.clientY-sTop,blockOriginal.top), top = Math.max(e.clientY - offset.top+sTop,0); } return {height:height, top:top}; }, up : function(e){ var blockOriginal = this.blockOriginal, sTop = Math.max(dBody.scrollTop,dDoc.scrollTop), offset = this.offset; if(e.clientY-offset.top-blockOriginal.height<=blockOriginal.top-sTop){ var top = Math.max(e.clientY-offset.top+sTop,0), maxHeight = blockOriginal.top + blockOriginal.height, height = Math.min(maxHeight,blockOriginal.top + blockOriginal.height -(e.clientY-offset.top)-sTop); }else{ var height = Math.min(e.clientY-offset.top-blockOriginal.top-blockOriginal.height+sTop,offset.height-blockOriginal.top-blockOriginal.height), top = blockOriginal.top+blockOriginal.height; } return {height:height, top:top}; }, left : function(e){ var blockOriginal = this.blockOriginal, offset = this.offset; if(e.clientX - offset.left - blockOriginal.width - blockOriginal.left<=0){ var left = Math.max(e.clientX - offset.left,0), width = Math.min(blockOriginal.left + blockOriginal.width,blockOriginal.left + blockOriginal.width -(e.clientX-offset.left)); }else{ var width = Math.min(e.clientX-offset.left-blockOriginal.left-blockOriginal.width,offset.width-blockOriginal.left-blockOriginal.width), left = blockOriginal.left + blockOriginal.width; } return {left : left, width : width}; }, right : function(e){ var blockOriginal = this.blockOriginal, offset = this.offset; if(e.clientX-offset.left>=blockOriginal.left){ var width = Math.min(offset.width - blockOriginal.left,e.clientX - offset.left - blockOriginal.left), left = blockOriginal.left; }else{ var width = Math.min(offset.left + blockOriginal.left - e.clientX,blockOriginal.left), left = Math.max(e.clientX - offset.left,0); } return {left : left, width : width}; }, rightDown : function(e){ return $.extend(this.right(e),this.down(e)); }, leftDown : function(e){ return $.extend(this.left(e),this.down(e)); }, rightUp : function(e){ return $.extend(this.right(e),this.up(e)); }, leftUp : function(e){ return $.extend(this.left(e),this.up(e)); }, getValue : function(){ var block = this.block; return { left : parseInt(block.css("left")), top : parseInt(block.css("top")), width : block.width(), height : block.height() } } } $.fn.clip = function(options){ options.container = this; return new clip(options); } })(); xx = $("#container").clip({ imgC : $("#imgC") }) </script> </body> </html>