[英]How to animate shape or image file along SVG paths with the Vivus js?
无需库,您可以使用原生 JavaScript 完成所有操作
创建您自己的 Web 组件<draw-path>
(所有现代浏览器都支持)
使用 JavaScript 制作所有动画。 关键是将pathLength
设置为1并使用getPointAtLength
到position SVG笔在正确的位置。
然后显示所需的所有 HTML (请参阅下面的 SO 片段):
是:
<draw-path d='M25 50a25 25 0 1 1 80 0a25 25 0 1 1-80 0'></draw-path>
<draw-path d='M25 25h50v50h-50v-50z' stroke='green' stroke-width='5' speed="0.007"></draw-path>
<draw-path stroke='red' stroke-width='5' speed=".01"></draw-path>
window.customElements.define("draw-path", class extends HTMLElement { constructor() { let template = (id) => document.getElementById(id).content.cloneNode(true); super() // super sets and returns this scope.attachShadow({mode: "open"}) // sets and returns this.shadowRoot.append(template(this.nodeName)); this.line = this.shadowRoot.querySelector("#line"); this.line.setAttribute("d", this.getAttribute("d") || "m10 60c30-70 55-70 75 0s55 70 85 0"); this.line.setAttribute("stroke", this.getAttribute("stroke") || "black"); this.line.setAttribute("stroke-width", this.getAttribute("stroke-width") || "2"); this.pen = this.shadowRoot.querySelector("#pen"); this.onmouseover = (evt) => this.draw(); } connectedCallback() { this.draw(); } showpen(state = true, scale) { this.pen.style.display = state? 'initial': 'none'; } draw() { clearInterval(this.drawing); this.showpen(); this.dashoffset = 1; this.pathlength = this.line.getTotalLength(); this.drawing = setInterval(() => this.update(), 50); } update() { this.dashoffset -= this.getAttribute("speed") || 0.02; let {x,y} = this.line.getPointAtLength(this.pathlength - this.dashoffset * this.pathlength); this.pen.setAttribute("transform", `translate(${x-2} ${y-2})`); this.line.style.strokeDashoffset = this.dashoffset; if (this.dashoffset <= 0) this.end(); } end() { clearInterval(this.drawing); this.showpen(false); //console.log("end",this.line); clearTimeout(this.timeout); this.timeout = setTimeout(()=>this.draw(),2000); } });
<draw-path d='M25 50a25 25 0 1 1 80 0a25 25 0 1 1-80 0'></draw-path> <draw-path d='M25 25h50v50h-50v-50z' stroke='green' stroke-width='5' speed="0.007"></draw-path> <draw-path stroke='red' stroke-width='8' speed=".01"></draw-path> <template id="DRAW-PATH"> <style>:host { display: inline-block } svg { width: 180px; height: 130px; background: beige } </style> <svg xmlns="http://www.w3.org/2000/svg"> <path id='line' pathlength='1' stroke-dasharray='1' stroke-dashoffse='1' fill='transparent'/> <path id='pen' stroke='black' stroke-width='2' fill='gold' d='m12 19l7-7l3 3l-7 7l-3-3zm6-6l-2-8l-14-3l4 15l7 1l5-5zm-16-11l8 8m-1 1a2 2 0 104 0a2 2 0 10-4 0'/> </svg> </template>
笔记:
请注意路径中的M
或m
(移动)会创建一个新的stroke ,同时绘制,而不是按顺序绘制。
所以stroke-dash*
设置同时应用。
这就是为什么在所有博客中您只看到使用单笔画简单路径或折线的原因。
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