jquery实现自定义图片裁剪功能【推荐】
1.自定义宽高效果
1.html 代码 index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="./jquery-1.12.4.min.js"></script> </head> <body> <img class="source" src="./test2.jpg" alt=""> <img src="" class="target" alt=""> </body> </html>
2.添加插件代码
(function ($) { $.fn.photoCrop=function (option) { var opt={ img:'', fixedScale:9/5, isHead:null, maxWidth:'1400', maxHeight:'800', callBack:function () {} } opt=$.extend(opt,option); var _this=this; var imgSrc=opt.img ? opt.img:_this.attr('src'); var photoCropBox=$('<div id="photoCropBox" style="position: fixed;width: 100%;height: 100%;top: 0;left: 0;background: rgba(0,0,0,0.5);z-index: 99999;padding: 20px;">' + '<canvas id="cropCanvas" style="position: absolute;opacity:1;left: 0;top: 0;z-index: 100"></canvas><img id="dataImg" src="'+imgSrc+'" style="opacity: 0;position: absolute" alt=""><div id="photoCropBox-panel-box" style="position: relative;width: 100%;height: 100%;">' + '<div id="photoCropBox-panel" style="opacity:0;background: #eee;border-radius: 5px;max-width: '+opt.maxWidth+'px;max-height: '+opt.maxHeight+'px;position: absolute;text-align: center"><div id="photoCropBox-img" style="margin: 40px 60px 20px;display: inline-block;position: relative">' + '<img src="'+imgSrc+'" style="max-width: 100%;display: block;max-height: 100%;max-height: '+(opt.maxHeight-110)+'px;" alt=""></div><div id="photoCropBox-option" style="text-align: right;padding-right: 50px;padding-bottom: 20px;position: relative;z-index: 2"><span id="photoCropBox-end">裁剪</span><span id="photoCropBox-start">手动裁剪</span><span id="photoCropBox-cancel">取消</span></div></div>' + '</div></div>'); $('body').append(photoCropBox); var _box=$('#photoCropBox-img'); var imgWidth=_box.find('img').width(); $('#photoCropBox-option span').css({ lineHeight:'30px', background:'#000', color:'#fff', display:'inline-block', paddingLeft:'20px', paddingRight:'20px', marginRight:'5px', cursor:'pointer' }) var cropBox=$('<div id="photoCropBox-cropBox" style="position: absolute;z-index: 5;cursor: Move;display: none">' + '<div id="cropBoxLine" style="overflow: hidden;position: absolute;width: 100%;height: 100%;">' + '<img src="'+imgSrc+'" style="display: block;width: '+_box.find('img').width()+'px;position: absolute;max-height: none;max-width: none" alt="">' + '<div class="top line" style="width: 100%;height: 1px;top: 0;left: 0;"></div><div class="right line" style="height: 100%;width: 1px;top: 0;right: 0"></div>' + '<div class="line bottom" style="width: 100%;height: 1px;bottom: 0px;left: 0"></div><div class="left line" style="height: 100%;width: 1px;top: 0;left: 0"></div></div>' + '<div id="cropBoxLine2"><div class="left line2" style="height: 100%;width: 1px;top: 0;left: 0;cursor: w-resize"></div><div class="right line2" style="height: 100%;width: 1px;top: 0;right: 0;cursor: e-resize"></div><div class="top line2" style="width: 100%;height: 1px;top: 0;left: 0;cursor: n-resize;position: absolute"></div><div class="bottom line2" style="width: 100%;height: 1px;bottom: 0px;left: 0;cursor: s-resize"></div>' + '<div class="left bot" style="left: -3px;top: 50%;margin-top: -4px;cursor: w-resize"></div><div class="right bot" style="right: -3px;top: 50%;margin-top: -4px;cursor: e-resize"></div><div class="bottom bot" style="bottom: -3px;left: 50%;margin-left: -4px;cursor: s-resize"></div><div class="top bot" style="top: -3px;left: 50%;margin-left: -4px;cursor: n-resize"></div>' + '<div class="left-top bot" style="left: -3px;top: -3px;cursor: nw-resize"></div><div class="left-bottom bot" style="left: -3px;bottom: -3px;cursor: sw-resize"></div><div class="right-top bot" style="right: -3px;top: -3px;cursor: ne-resize"></div><div class="right-bottom bot"style="right: -3px;bottom: -3px;cursor: se-resize"></div></div></div>'); var screen=$('<div id="photoCropBox-bg" style="background: rgba(0,0,0,.5);position: absolute;left: 0;top: 0;width: 100%;height: 100%;z-index: 4;cursor: crosshair;display: none"></div>') _box.append(cropBox); _box.append(screen); var _corp=$('#photoCropBox-cropBox'); var cropBoxLine=$('#cropBoxLine'); setTimeout(function () { console.log(imgWidth) cropBoxLine.find('img').css('width',_box.find('img').width()+'px') },20) if(opt.isHead){ cropBoxLine.css({borderRadius:'100%'}) } $('#photoCropBox-cropBox .line,#photoCropBox-cropBox .line2').css({ background:'url(./img/Jcrop.gif)', position:'absolute', opacity:.5 }) $('#photoCropBox-cropBox .bot').css({ background:'rgba(0,0,0,0.5)', position:'absolute', width:7, height:7, border:'1px #999 solid' }) setTimeout(function () { init(); },10) $(window).on('resize',function () { setPosition(); }) $('#photoCropBox-cancel').on('click',function () { closeBox(); }) $('#photoCropBox-bg').on('mousedown',function (e) { if(opt.fixedScale) return //固定 $('#cropBoxLine2').hide(); var _this=$(this); var _sx=e.pageX,_sy=e.pageY; var _tx=_this.offset().left; var _ty=_this.offset().top; $(document).on('mousemove',function (e) { e.preventDefault(); var _ex=e.pageX,_ey=e.pageY; getPosition(_ex,_ey,_ty,_tx,_sx,_sy,_this) }) $(document).on('mouseup',function () { $(document).unbind('mousemove'); $('#cropBoxLine2').show(); }) }) var lock=false; _corp.on('mousedown',function (e) { if(lock){return} var _sx=e.pageX,_sy=e.pageY; var pW=$('#photoCropBox-bg').width(),pH=$('#photoCropBox-bg').height(); var _this=$(this),_thisX=parseInt(_this.css('left')),_thisY=parseInt(_this.css('top')),_thisW=parseInt(_this.css('width')),_thisH=parseInt(_this.css('height')); $(document).on('mousemove',function (e) { e.preventDefault(); var _ex=e.pageX,_ey=e.pageY; var _x=_ex-_sx,_y=_ey-_sy; _x+=_thisX;_y+=_thisY; if(_x<0) _x=0; if(_y<0) _y=0; if(_y>pH-_thisH) _y=pH-_thisH; if(_x>pW-_thisW) _x=pW-_thisW; resizeCropBox("","",_y,_x,true) }) $(document).on('mouseup',function () { $(document).unbind('mousemove'); }) }) //控制大小 $('#cropBoxLine2 .bot').on("mousedown",function (e) { lock=true; var _esx=e.pageX,_esy=e.pageY; var _that=$(this); var _this=$('#photoCropBox-bg'); var _tx=_this.offset().left; var _ty=_this.offset().top; var _sx=_corp.offset().left,_sy=_corp.offset().top;//裁剪框 if(_that.hasClass('right-top')) _sy+=_corp.height(); if(_that.hasClass('left-top')){ _sy+=_corp.height(); _sx+=_corp.width(); } if(_that.hasClass('left-bottom')) _sx+=_corp.width(); $(document).on('mousemove',function (e) { e.preventDefault(); var _ex=e.pageX,_ey=e.pageY; if(opt.fixedScale){ _ey=(_ex-_esx)/opt.fixedScale+_esy; if(_that.hasClass('right-top') || _that.hasClass('left-bottom')){ _ey=(_esx-_ex)/opt.fixedScale+_esy; } } getPosition(_ex,_ey,_ty,_tx,_sx,_sy,_this) }) $(document).on('mouseup',function () { $(document).unbind('mousemove'); lock=false; }) }) $('#cropBoxLine2 .left,#cropBoxLine2 .top,#cropBoxLine2 .right,#cropBoxLine2 .bottom').on('mousedown',function (e) { if(opt.fixedScale) return //固定 lock=true; var _that=$(this); var _this=$('#photoCropBox-bg'); var _tx=_this.offset().left;// var _ty=_this.offset().top; var _sx=_corp.offset().left,_sy=_corp.offset().top; var ch=_corp.height(),cw=_corp.width(); if(_that.hasClass('top')){ _sy+=ch; }else if(_that.hasClass('left')) { _sx+=cw; } $(document).on('mousemove',function (e) { e.preventDefault(); var _ex=e.pageX,_ey=e.pageY; if(_that.hasClass('top') || _that.hasClass('bottom')){ if(!(_ey-_sy>0)){ var _x=_sx-_tx,_y=_ey-_ty,_w=cw,_h=-(_ey-_sy); if(_y<0) {_y=0;_h=_sy-_ty;} }else{ var _x=_sx-_tx,_y=_sy-_ty,_w=cw,_h=_ey-_sy; if(_h>_this.height()-_y) _h=_this.height()-_y; } }else { if(_ex-_sx>0 && _ey-_sy>0){ var _x=_sx-_tx,_y=_sy-_ty,_w=_ex-_sx,_h=ch; if(_w>_this.width()-_x) _w=_this.width()-_x; }else if(!(_ex-_sx>0) && _ey-_sy>0){ var _x=_ex-_tx,_y=_sy-_ty,_w=-(_ex-_sx),_h=ch; if(_x<0) {_x=0;_w=_sx-_tx;} } } resizeCropBox(_w,_h,_y,_x); }) $(document).on('mouseup',function () { $(document).unbind('mousemove'); lock=false; }) }) $('#photoCropBox-start').on('click',function () { _corp.css('display','block') $('#photoCropBox-bg').css('display','block') }) $('#photoCropBox-end').on('click',function () { getImage() closeBox() }) function init() { setPosition() if(opt.fixedScale){ if((_box.height()-_box.width()/opt.fixedScale/2)<0){ resizeCropBox(_box.height()*opt.fixedScale,_box.height(),0,(_box.width()-_box.height()*opt.fixedScale)/2) }else { resizeCropBox(_box.width()/2,_box.width()/opt.fixedScale/2,(_box.height()-_box.width()/opt.fixedScale/2)/2,_box.width()/4) } }else { resizeCropBox(_box.width()/2,_box.height()/2,_box.height()/4,_box.width()/4) } if(opt.fixedScale) { $('.bot.top,.bot.left,.bot.bottom,.bot.right').remove();//固定 } } function setPosition() { $('#photoCropBox-panel').css({ top:($('#photoCropBox-panel-box').height()-$('#photoCropBox-panel').height())/2+'px', left:($('#photoCropBox-panel-box').width()-$('#photoCropBox-panel').width())/2+'px', opacity:1 }) } //结束x,y 背景x,y function getPosition(_ex,_ey,_ty,_tx,_sx,_sy,_this) { if(_ex-_sx>0 && _ey-_sy>0){ var _x=_sx-_tx,_y=_sy-_ty,_w=_ex-_sx,_h=_ey-_sy; if(_w>_this.width()-_x) _w=_this.width()-_x; if(_h>_this.height()-_y) _h=_this.height()-_y; }else if(!(_ex-_sx>0) && _ey-_sy>0){ var _x=_ex-_tx,_y=_sy-_ty,_w=-(_ex-_sx),_h=_ey-_sy; if(_x<0) {_x=0;_w=_sx-_tx;} if(_h>_this.height()-_y) _h=_this.height()-_y; }else if(!(_ex-_sx>0) && !(_ey-_sy>0)){ var _x=_ex-_tx,_y=_ey-_ty,_w=-(_ex-_sx),_h=-(_ey-_sy); if(_x<0) {_x=0;_w=_sx-_tx;} if(_y<0) {_y=0;_h=_sy-_ty;} }else if(_ex-_sx>0 && !(_ey-_sy>0)){ var _x=_sx-_tx,_y=_ey-_ty,_w=_ex-_sx,_h=-(_ey-_sy); if(_y<0) {_y=0;_h=_sy-_ty;} if(_w>_this.width()-_x) _w=_this.width()-_x; } if(opt.fixedScale){ if(_w/opt.fixedScale>_h){ _w=_h*opt.fixedScale }else if (_w<opt.fixedScale*_h){ _h=_w/opt.fixedScale } } resizeCropBox(_w,_h,_y,_x); } var c=document.getElementById("cropCanvas"); var ctx=c.getContext("2d"); var img=$('#dataImg'); function getImage() { var scale=$('#photoCropBox-img').width()/$('#dataImg').width(); var sx=parseInt(_corp.css('left'))/scale; var sy=parseInt(_corp.css('top'))/scale; var swidth=parseInt(_corp.css('width'))/scale; var sheight=parseInt(_corp.css('height'))/scale; var c_img = new Image; c_img.onload = function () { ctx.drawImage(c_img,sx,sy,swidth,sheight,0,0,swidth,sheight); var url=c.toDataURL("image/jpeg"); opt.callBack(url); }; c_img.crossOrigin = 'anonymous'; //可选值:anonymous,* c_img.src = imgSrc c.width = swidth; c.height = sheight; } //宽,高,top,left,m-是否是拖拽 function resizeCropBox(w,h,t,l,m) { _corp.css(prefix()+'transition','all 0s'); if(!m){ _corp.css({ width:w, height:h, top:t+'px', left:l+'px' }) }else { _corp.css({ top:t+'px', left:l+'px' }) } cropBoxLine.find('img').css({ top:-t+'px', left:-l+'px' }) } function closeBox() { $('#photoCropBox').remove(); } function prefix() { var prefixes=['','-ms-','-moz-','-webkit-','-o-'],i=0; while (i < prefixes.length){ if($('body').css(prefixes[i]+'transition')){ return prefixes[i]; } i++; } } } })(jQuery)
3.绑定代码
$(function () { $('.source').on('click',function () { $(this).photoCrop({ fixedScale:false, isHead:false, callBack:function(url){ $('.target').attr('src',url) }, }); }) })
2.宽高比例固定效果
代码:
$(function () { $('.source').on('click',function () { $(this).photoCrop({ fixedScale:5/6, isHead:false, callBack:function(url){ $('.target').attr('src',url) }, }); }) })
3.头像裁剪效果
代码:
$(function () { $('.source').on('click',function () { $(this).photoCrop({ fixedScale:1, isHead:true, callBack:function(url){ $('.target').attr('src',url) }, }); }) })
以上代码易修改,大家可以自行扩展。希望本文的内容对大家的学习或者工作能带来一定的帮助,同时也希望多多支持我们!
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