vue 实现无规则截图

大家所见到的大多数都是有规则截图,可以应付大部分的应用场景,但是对于图片处理,想要将规则交给用户,普通的截图已经满足不了用户了,那我们能不能前端实现图片的任意规则截取,接下来让我一起探讨一下吧!

使用svg中clipPath image标签 通过id 映射, 动态位置polygon的坐标,实现图片的截取

<div><div @mousemove='mousemove' @mouseup='(e) => {mouseup(e);}'> <!-- 画布展示 --> <svg ref='blackSvg' xmlns='http://www.w3.org/2000/svg' > <defs> <clipPath id='clippath'><polygon :points='points'></polygon> </clipPath> </defs> <image xmlns:link='http://www.w3.org/1999/xlink' href='https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3228549874,2173006364&fm=26&gp=0.jpg' rel='external nofollow' preserveAspectRatio='none' ></image> </svg> <!-- 拖拽点 --> <ul class='interception'> <li v-for='item in 4' :ref='`li${item}`' :key='item' @mousedown='(e) => {mousedown(e, item);}' ></li> </ul> <!-- 底图展示 --> <img src='https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3228549874,2173006364&fm=26&gp=0.jpg' alt='' /> <!-- 遮罩层 --> <div class='blackDiv'></div> </div> </div>css部分

<style lang='sass'>.blackDiv width: 100% height: 100% position: absolute top: 0 z-index: 2 background: rgba(0,0,0, 1).content width:300px height:300px text-align: left position: relative .blackSvgposition: absolutetop: 0z-index: 3 .blackImgeposition: absolutetop: 0left: 0width: 300pxheight: 300px .interceptionlist-style: noneposition: absolutetop: 0margin: 0padding: 0z-index: 3>li position: absolute width: 10px height: 10px background: blue border-radius: 50% cursor: pointer &:hovertransform: scale(1.2)transition-duration: .2>li:nth-child(1) top: 10px left: 10px>li:nth-child(2) top: 10px left: 100px>li:nth-child(3) top: 100px left: 100px>li:nth-child(4) top: 100px left: 10px</style><script>

export default { name: ’Canvas’, data() { return { points: ’0 0,300 0,300 300,0 300’, // 图片展示初始化 status: false, index: 0, disX: 0, disY: 0, coordinates: { // 初始化拖拽点1: [0, 0],2: [300, 0],3: [300, 300],4: [0, 300], }, }; }, mounted() { this.$nextTick(() => { for (let key in this.coordinates) {const left = this.coordinates[key][0];const top = this.coordinates[key][1];this.$refs[`li${key}`].style.left = `${left}px`;this.$refs[`li${key}`].style.top = `${top}px`;if (key == 2 || key == 3) { this.$refs[`li${key}`].style.left = `${left - 10}px`;}if (key == 3 || key == 4) { this.$refs[`li${key}`].style.top = `${top - 10}px`;} } document.onmouseup = () => {this.status = false; }; }); }, methods: { //鼠标按下 mousedown(e, index) { this.status = true; this.index = index; this.disX = e.clientX - this.$refs[`li${index}`].offsetLeft; this.disY = e.clientY - this.$refs[`li${index}`].offsetTop; }, // 鼠标抬起 mouseup(e) { this.status = false; }, // 鼠标移动 mousemove(e) { if (this.status) {let left = e.clientX - this.disX;let top = e.clientY - this.disY;this.$refs[`li${this.index}`].style.left = `${left}px`;this.$refs[`li${this.index}`].style.top = `${top}px`;this.coordinates[this.index] = [left, top];const pointsArr = [];for (let item in this.coordinates) { pointsArr.push( Array.from(this.coordinates[item], (e) => { return e + 5; }) );}this.points = pointsArr.join(’ ’); } }, },};效果图展示

github地址--> github.com/lgxin/captu…

以上就是vue 实现无规则截图的详细内容，更多关于vue 无规则截图的资料请关注好吧啦网其它相关文章！