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!
通过 svg 实现 图片截取
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
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<div> <div class="content" @mousemove="mousemove" @mouseup="(e) => {mouseup(e);}"> <!-- 画布展示 --> <svg ref="blackSvg" class="blackSvg" xmlns="http://www.w3.org/2000/svg" width="300" height="300" > <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" width="300" height="300" preserveAspectRatio="none" style="clip-path: url(#clippath)" ></image> </svg> <!-- 拖拽点 --> <ul class="interception"> <li v-for="item in 4" :ref="`li${item}`" :key="item" @mousedown="(e) => {mousedown(e, item);}" ></li> </ul> <!-- 底图展示 --> <img class="blackImge" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3228549874,2173006364&fm=26&gp=0.jpg" alt="" /> <!-- 遮罩层 --> <div class="blackDiv"></div> </div></div> |
css部分
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<style lang="sass">.blackDiv width: 100% height: 100% position: absolute top: 0 z-index: 2 background: rgba(0,0,0, 1).content width:300px height:300px text-align: left position: relative .blackSvg position: absolute top: 0 z-index: 3 .blackImge position: absolute top: 0 left: 0 width: 300px height: 300px .interception list-style: none position: absolute top: 0 margin: 0 padding: 0 z-index: 3 >li position: absolute width: 10px height: 10px background: blue border-radius: 50% cursor: pointer &:hover transform: scale(1.2) transition-duration: .2 >li:nth-child(1) top: 10px left: 10px >li:nth-child(2) top: 10px left: 100px >li:nth-child(3) top: 100px left: 100px >li:nth-child(4) top: 100px left: 10px</style><script> |
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export default { name: 'Canvas', data() { return { points: '0 0,300 0,300 300,0 300', // 图片展示初始化 status: false, index: 0, disX: 0, disY: 0, coordinates: { // 初始化拖拽点 1: [0, 0], 2: [300, 0], 3: [300, 300], 4: [0, 300], }, }; }, mounted() { this.$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
源码地址
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服务器之家其它相关文章！
原文链接：https://juejin.cn/post/6950478072906776589
