Interpretation of javascript image cropping techniques_javascript techniques

When learning the php gd library, I saw that there is a picture that can be cropped into exactly the same shape. It’s actually quite simple. > The code is as follows: Resize *{ 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/cnblogs_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;} .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/cnblogs_com/wtcsy/192373/r_xx.jpg);} (function(){ var dBody = document.body, dDoc = document.documentElement; var clip = function(options){ this.init.call(this,options); } clip.prototype = { options :{ moveCallBack : function(){}, className : "block" }, init : function(options){ $.extend(this,this.options,options||{}); if(!this.container || !this.imgC){ return; } this.container = $(this.container); var self = this; this.block = $(' \ \ \ \ \ \ \ \ \ ') .bind("mousedown.r",function(e){self.start(e)}) .appendTo(this.container[0]); this.setImg() ; }, setImg : function(){ var block = this.block; this.imgC.css({ height: block.height(), width : block.width(), "background-position" : "-" block.css("left") " -" block.css("top") }); }, start : function(e){ var $elem = $(e.target), block = this.block, self = this, move = false, container = this.container, action = $elem.attr("action"); //Every time the basic dom structure is changed, the zoom of the browser will change the value inside. 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; } $(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"); }, move : function(e,isMove){ window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();

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 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 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); } })(); $("#container").clip({ imgC : $("#imgC") })

Interpretation of javascript image cropping techniques_javascript techniques

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