Wie kann ich Bilder individuell zuschneiden? In diesem Artikel wird hauptsächlich JQuery zum Implementieren einer benutzerdefinierten Bildzuschneidefunktion vorgestellt. Der Code ist sehr einfach und leicht zu ändern. Werfen wir einen Blick mit dem untenstehenden Editor. Ich hoffe, er kann allen helfen.
1. Breiten- und Höheneffekt anpassen
1.html code 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 Plug-in-Code
(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=$('<p 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=""><p id="photoCropBox-panel-box" style="position: relative;width: 100%;height: 100%;">' +
'<p 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"><p 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=""></p><p 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></p></p>' +
'</p></p>');
$('body').append(photoCropBox);
var _box=$('#photoCropBox-img');
var imgWidth=_box.find('img').width();
$('#photoCropBox-option span').css({
lineHeight:'30px',
background:'#000',
color:'#fff',
display:'inline-block',
paddingLeft:'20px',
paddingRight:'20px',
marginRight:'5px',
cursor:'pointer'
})
var cropBox=$('<p id="photoCropBox-cropBox" style="position: absolute;z-index: 5;cursor: Move;display: none">' +
'<p 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="">' +
'<p class="top line" style="width: 100%;height: 1px;top: 0;left: 0;"></p><p class="right line" style="height: 100%;width: 1px;top: 0;right: 0"></p>' +
'<p class="line bottom" style="width: 100%;height: 1px;bottom: 0px;left: 0"></p><p class="left line" style="height: 100%;width: 1px;top: 0;left: 0"></p></p>' +
'<p id="cropBoxLine2"><p class="left line2" style="height: 100%;width: 1px;top: 0;left: 0;cursor: w-resize"></p><p class="right line2" style="height: 100%;width: 1px;top: 0;right: 0;cursor: e-resize"></p><p class="top line2" style="width: 100%;height: 1px;top: 0;left: 0;cursor: n-resize;position: absolute"></p><p class="bottom line2" style="width: 100%;height: 1px;bottom: 0px;left: 0;cursor: s-resize"></p>' +
'<p class="left bot" style="left: -3px;top: 50%;margin-top: -4px;cursor: w-resize"></p><p class="right bot" style="right: -3px;top: 50%;margin-top: -4px;cursor: e-resize"></p><p class="bottom bot" style="bottom: -3px;left: 50%;margin-left: -4px;cursor: s-resize"></p><p class="top bot" style="top: -3px;left: 50%;margin-left: -4px;cursor: n-resize"></p>' +
'<p class="left-top bot" style="left: -3px;top: -3px;cursor: nw-resize"></p><p class="left-bottom bot" style="left: -3px;bottom: -3px;cursor: sw-resize"></p><p class="right-top bot" style="right: -3px;top: -3px;cursor: ne-resize"></p><p class="right-bottom bot"style="right: -3px;bottom: -3px;cursor: se-resize"></p></p></p>');
var screen=$('<p id="photoCropBox-bg" style="background: rgba(0,0,0,.5);position: absolute;left: 0;top: 0;width: 100%;height: 100%;z-index: 4;cursor: crosshair;display: none"></p>')
_box.append(cropBox);
_box.append(screen);
var _corp=$('#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. Bindungscode
$(function () {
$('.source').on('click',function () {
$(this).photoCrop({
fixedScale:false,
isHead:false,
callBack:function(url){
$('.target').attr('src',url)
},
});
})
})2. Fester Effekt des Breiten-zu-Höhen-Verhältnisses
Code:
$(function () {
$('.source').on('click',function () {
$(this).photoCrop({
fixedScale:5/6,
isHead:false,
callBack:function(url){
$('.target').attr('src',url)
},
});
})
})3. Avatar-Zuschneideeffekt
Code:
$(function () {
$('.source').on('click',function () {
$(this).photoCrop({
fixedScale:1,
isHead:true,
callBack:function(url){
$('.target').attr('src',url)
},
});
})
})Haben Sie es gelernt? Beeilen Sie sich und probieren Sie es aus.
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