<template> <div class="crop-image" :style="wrapStyle"> <img :src="url" alt="" crossOrigin="anonymous" :style="imgStyle" v-if="url"> <canvas ref="canvas" @mousedown="onmousedown" @mousemove="onmousemove" @mousewheel="onmousewheel" ></canvas> </div> </template> <script> export default { name:"crop-image", props:{ opt:{ type:Object, default(){ return { width:400, height:400, addScale: 0.06 // zooming speed }; } } }, data(){ return { img: zero, url:null, imgInfo: information before null, // compression Information null, // after compression: imgCInfo clipInfo: null, // information before compression Information after the null, // Compression: clipCinfo ctx: null, // drawing board pos: {x: 0, y: 0}, You: 0 } }, computed:{ wrapStyle(){ return { width:`${this.opt.width}px`, height:`${this.opt.height}px` } }, imgStyle(){ let imgCInfo = this.imgCInfo; if(imgCInfo){ return { width: `${imgCInfo.w}px`, height: `${imgCInfo.h}px`, left:`${this.pos.x}px`, top:`${this.pos.y}px`, transformed: `rotateZ ($ {} this.deg you)`, transformOrigin: "center" } } return {height:"0px",height:"0px",display:"none"}; } }, mounted(){ let canvas = this.$refs.canvas; canvas.width = this.opt.width; canvas.height = this.opt.height; this.ctx = canvas.getContext("2d"); window.addEventListener("mouseup",this.onmouseup); }, methods:{ init(src,bound){ this.setSrc(src) this.setClip(bound); }, loadImage(url,attrs){ let img = new Image(); img.src = url; attrs = attrs || {}; for(let i in attrs){ img[i] = attrs[i]; } return new Promise((resolve,reject)=>{ img.onload = function(){ resolve(img); }; img.onerror = reject; }); }, compress(target){ // compression ratio let opt = this.opt; let wRate = opt.width/opt.height; let tRate = target.width/target.height; let w,h,scale; if(wRate > tRate){ h = opt.height; scale = h/target.height; w = scale * target.width; }else{ w = opt.width; scale = w / target.width; h = scale * target.height; } return { w,h,scale } }, // external calls async setSrc(src){ let img = await this.loadImage(src,{crossOrigin:"anonymous"}); this.url = src; this.img = img; this.setImg(img); }, // external calls Setclip (Clipinfao) { if(clipInfo){ this.clipInfo = { w:clipInfo.width, h:clipInfo.height }; this.clipCinfo = this.compress(clipInfo); this.clipCinfo.x = (this.opt.width - this.clipCinfo.w)/2; this.clipCinfo.y = (this.opt.height - this.clipCinfo.h)/2; this.fill(); } }, async exportBase(){ // base64 Exporting pictures look you = this.deg; let pos = this.pos; let clipCinfo = this.clipCinfo; let imgCInfo = this.imgCInfo; // width height after compression let imgInfo = this.imgInfo; // original width and height let scale = imgCInfo.scale; let sx = clipCinfo.x - pos.x; let s = clipCinfo.y - pos.y; let canvas = document.createElement("canvas"); canvas.width = parseInt(clipCinfo.w / scale); canvas.height = parseInt(clipCinfo.h / scale); let swidth = imgInfo.w; let sheight = imgInfo.h; if(swidth < canvas.width){ swidth = canvas.width } if(sheight < canvas.height){ sheight = canvas.height } let ctx = canvas.getContext("2d"); let img = this.img; if (you! = 0) { img = await this.loadImage(this.getRotateImg()); if (you == 90 || you == 270) { // vertically, we need to coordinate conversion let x = pos.x + (imgCInfo.w -imgCInfo.h)/2; let y = pos.y + (imgCInfo.h -imgCInfo.w)/2; sx = clipCinfo.x - x; sy = clipCinfo.y - and; } } sx /= scale; and / = scale; ctx.drawImage(img,sx,sy,swidth,sheight,0,0,swidth,sheight); return canvas.toDataURL("image/png"); }, rotate(flag){ // rotation look you = this.deg; if(flag){ you + = 90; }else{ you - = 90; } if(deg >= 360){ you - = 360; } if(deg <= 0){ you + = 360; } this.deg = you; }, getRotateImg () { // Get the picture after rotation look you = this.deg; let imgInfo = this.imgInfo; let canvas = document.createElement("canvas"); let w,h; if (you == 90 || you == 270) { // vertical w = imgInfo.h; h = imgInfo.w; }else{ // lazy manner w = imgInfo.w; h = imgInfo.h; } canvas.width = w; canvas.height = h; let ctx = canvas.getContext("2d"); ctx.translate(w/2,h/2); ctx.rotate(deg * Math.PI/180 ); ctx.drawImage(this.img,0,0,imgInfo.w,imgInfo.h,-imgInfo.w/2,-imgInfo.h/2,imgInfo.w,imgInfo.h); return canvas.toDataURL("image/png"); }, setImg(img){ this.imgInfo = { w:img.width, h:img.height }; this.imgCInfo = this.compress(img); let x = (this.opt.width - this.imgCInfo.w)/2; let y = (this.opt.height - this.imgCInfo.h)/2; this.pos = { x, y }; }, onmouseup(){ this.mouse = null; }, onmousedown(e){ this.mouse = { x:e.offsetX, y: e.offsetY } }, onmousemove(e){ if(this.mouse){ this.pos.x += e.offsetX - this.mouse.x ; this.pos.y += e.offsetY - this.mouse.y; this.mouse = { x:e.offsetX, y: e.offsetY }; } }, onmousewheel(event){ event.preventDefault(); const direction = (event.wheelDelta || -event.detail) > 0 ? 1 : 0; let addScale = this.opt.addScale || 0.06; let w,h,scale; if(direction){ // Enlarge w = this.imgCInfo.w * (1 + addScale); }else{ // shrink w = this.imgCInfo.w * (1 - addScale); } if(w < 10){ w = 10; } scale = w/this.imgInfo.w; h = this.imgInfo.h * scale; let x = this.pos.x - (w - this.imgCInfo.w)/2; let y = this.pos.y - (h - this.imgCInfo.h)/2; this.pos = { x, y }; this.imgCInfo = { scale, w, h } }, fill(){ let {w,h,x,y} = this.clipCinfo; let clipctx = this.ctx; let opt = this.opt; clipctx.clearRect(0, 0, opt.width, opt.height); clipctx.beginPath (); clipctx.fillStyle = 'rgba(0,0,0,0.6)'; clipctx.strokeStyle = "green"; // mask layer clipctx.globalCompositeOperation = "source-over"; clipctx.fillRect(0, 0, opt.width, opt.height); // Frame clipctx.globalCompositeOperation = 'destination-out'; clipctx.fillStyle = 'rgba(0,0,0,1)'; clipctx.fillRect(x, y, w, h); // Stroke clipctx.globalCompositeOperation = "source-over"; clipctx.moveTo (x, y); clipctx.lineTo (x + w, y); clipctx.lineTo(x + w, y + h); clipctx.lineTo (x, y + h); clipctx.lineTo (x, y); clipctx.stroke(); clipctx.closePath(); } } } </script> <style lang="scss" scoped> .crop-image{ border: 1px solid rgb(35, 184, 255); margin: 20px auto; position: relative; overflow: hidden; background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAR0AAACgCAYAAAAxSbhkAAAIHElEQVR4Xu3dsXIbRxCE4VViR44UOHOoF + D7v4jewIEiRmakwu2ydFtL2BYL09CCHyOJhTpKg8F / Fd2sve / Tksh9chfarbuwp7 + // Wg5tfablje97fash + b + vQ66Af9cMbE1X74NJrl8uLfWmuf34DLS2vt2xvf9 / peFPXpddAP + Ugniav9chiःo03ilo7ya79rlp9in + KOkH0FklnDHBmPC / Cshgs2v / VGatABHZAF2ShkQQd0QAd0QIfHNJEQFEAhCoXqFPuidF5jcimMFObc3PpBP5T0wwU6rl / UqO6oD3VHrb5ju / 7hrilag + dcoLO6un8dBGlGO9LMXxo3 / eh3b3fQAd0QNY + Tsk + zrWbCuiADuiADuiMCvCYeEw8pge8KTp7tb6pUhupTUlq42zjUdYXy4ErdCgsCovCKlRYoAM6IAuyUciCDuiADuiAzqiAVEWqEk1Vdt9 / 2eXfT + lQOpQOpRNXOs5ezeDxG / B6PaR4UrySFM9yYKFLb83 / KK4x2Zg8jcmgAzqgAApR7wx0QAd0QAd0RgUYnAzOqMFpHM6Mw5QOpUPpUDpxpXNRFJcvqY3U5tx8 + a / lPSDPZ1V6RjrjHXGusIJAHRAB2RBNgpZ0AEd0AEd0BkVYHAyOKMG5y5nl3ZP2SgdSofSoXTiSsfZqxk8UhupTUlq01r7tt7jPl5qbE + n0KXfXQb79x / Nyarchy / 8ZgPOqDjQ3XjDxVv6Cjo1bEddEAHdEAnatiDDuiADuiAzqiAVEWqEk1VeFgZD8tzr1al4zfm9ZpI8aR4JSmePR17OhQlRRlVlKADOqADOqAzKsDgZHBGDU5R979H3beqD6VD6VA6lA6lQ + lMJAQFUIhCoTrFuygdZ69mtSO1kdqUpDbOXvVU1HLgOl7xknhJvKRC2wF0QAdkQTYKWdABHdABHdAZFWCgMlAfykCtNmh3uT6lQ + lQOpROXOl47tUMHmevej2keFK8khTPcmChS3 + rDc5dZLP / 79FMbIH / sAVAB3R8SHhnUe8MdEAHdEAHdEYFGJwMzqjBaTzMjIeUDqVD6VA6caXj7NUMHqmN1KYktXH2qqei9nTs6RhjjbHRMRZ0QAd0QAd0RgV4DbyGqNdgH + ood / lNiNKhdMqbTCqUSYV2gSbogA7oGK / i45WzVzN4nL3q9ZDiSfFKUjx7OvZ0eGe8s6h3BjqgAzqgAzqjArwGXkPUa2B4ZwxvSofSoXQoHUqH0plICAqgEIVCdfTuuVer0pHaSG1KUhtnr3oqak / Hng7vjHcW9c5AB3RAB3RAZ1SAl8HLeCgvo9or2eX6lA6lQ + lQOpQOpTOREBRAIQqF6n2li9Jx9mpWO85e9XpI8aR4JSme5cB1vOIl8ZJ4SYW2A + iADsiCbBSyoAM6oAM6oDMqwEBloD6UgVpt0O5yfUqH0qF0KJ240vHcqxk8UhupTUlq4 + xVT0UtBxa69LtsiO4iy9XzaNbtbQfQAZ3tmxg0jybeZkwGHdABHYZ91LAHHdABHdABnVGBbeQieb + XvPd + 3ff9cvZqVTrOXvWaSPGkeCUpnj0dezoUpT2d + J7O0 / iJZnuzfXS2N + bcd8y5V / 0pHUqH0qF0KB3KayIhKIBCFArVS5iUDqUDaqAWhZrnXq3QkdpIbUpSG2eveipqOXCFDkOdoc5QL5wAQAd0QBZko5AFHdABHdABnVEBBieDM2pwVqc2rn 8nc + + + UDqVD6VA6caXjuVczeJy96vWQ4knxSlI8ezqFLv291szJ C7j1f + owy9nU4AO6PxyTQmajw1N0AEd0GHYRw170AEd0AEd0BkVMJNLVaKpCg8o4wE5e7UqHamN1KYktXH2qqei9nTs6VCUFGVUUYIO6IAO6IDOqACDk8EZNThF9ZmontKhdCgdSofSoXQmEoICKEShUJ3iee7VqnScveo1keJJ8UpSPMuBK3R4SbwkXlKh7QA6oAOyIBuFLOiADuiADuiMCjBQGagPZaBWG7S7XJ / SoXQoHUonrnS + jJ8otZHanJtPP iHkn6wHFjo0ttwPYprTDYmT2My6IAOKIBC1DsDHdABHdABnVEBBieDM2pwGocz4zClQ + + + lQOpROXOl47tUMHqmN1KYktWmtfV7vce3D9Zs9HXs6xlhjbHSMBR3QAR3QAZ1RAV4DryHqNexyjGB3w5vSoXQoHUqH0qF0JhKCAihEoVCtpDz3alU6fmNer8mHS1U8l p438v7356OPR3eGe8s6p2BDuiADuiAzqgAL4OX8VBeRrVXssv1KR1Kh9KhdCgdSmciISiAQhQK1ftKnnu1Kh2pTa9JeYrhLNLHTAktB67Q4SXxknhJhbYD6IAOyIJsFLKgAzqgAzqgMyrAQGWgPpSBWm3Q7nJ9SofSoXQonbjS8dyrGTxSm14PKZ4U7 / zJuFk / WA4sdOl32RDdRZar59Gs29sOoAM62zcxaB5NvM2YDDqgAzoM + 6hhDzqgAzqgAzqjAtvIRfJ + L3nv / footbridge ++ Xs1ap0bubSO1skBTu1l1R0pKL2dOzpUJT2dOJ7Ok / jJ5rtzfbR2d6Yc98x5171p3QoHUqH0qF0KK+JhKAAClEoVC9hUjqUDqiBWhRqnnu1QkfKMFIGz4E6CqEfbtwPlgMtBwoQBAjRAAF0QAd0QAd0RgV4DbyGqNdQbaC6/vF2PlM6lA6lQ+lQOpTOREJQAIUoFKqXBp29WpWOs1e9JlKbG6c2zuIdBX2xp7NCh5fES+IlFdoOF+j8Na7/T2vt7/Vntd9ba3++8X2v70VRn14H/aAfzpi42g/fASYLwjjeopD0AAAAAElFTkSuQmCC) center repeat; canvas{ width: 100%; height: 100%; position: relative; z-index: 2; cursor: move; } img{ position: absolute; z-index: 1; } } </style>
initialization:
. This $ refs.cropImage.init ( "image path", {width: 80, height: 120});
Rotation:
this.$refs.cropImage.rotate()
Export equal proportions of the picture:
this.src = await this.$refs.cropImage.exportBase();