canvas实现闪电文字雕刻文字电光火花动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：canvas实现闪电文字雕刻文字电光火花动画效果代码，可自己输入自定义文字。

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <link type="text/css" rel="stylesheet" href="//repo.bfw.wiki/bfwrepo/css/normalize.5.0.css">
<style>
    .page-thunder-to-text {
  position: relative;
  overflow: hidden;
}
.page-thunder-to-text canvas {
  display: block;
}
.page-thunder-to-text input {
  position: absolute;
  bottom: 50px;
  left: 0;
  right: 0;
  display: block;
  outline: none;
  background-color: rgba(38, 50, 56, 0.2);
  color: #ffffff;
  border: none;
  width: 50%;
  min-width: 500px;
  max-width: 100%;
  margin: auto;
  height: 60px;
  line-height: 60px;
  font-size: 40px;
  padding: 0 20px;
}
.page-thunder-to-text input:hover, .page-thunder-to-text input:focus {
  border: 1px solid rgba(38, 50, 56, 0.6);
}
.page-thunder-to-text input::-webkit-input-placeholder {
  color: rgba(255, 255, 255, 0.1);
}
</style>

</head>
<body>
<!-- partial:index.partial.html -->
<div class="page page-thunder-to-text">
	<input id="input" type="text" maxlength="24" placeholder="I love you!">
	<canvas id="canvas"></canvas>
</div>
<!-- partial -->
  <script>
      
      let canvas, ctx, w, h, thunder, text, particles, input;

function Thunder(options) {
  options = options || {};
  this.lifespan = options.lifespan || Math.round(Math.random() * 10 + 10);
  this.maxlife = this.lifespan;
  this.color = options.color || '#fefefe';
  this.glow = options.glow || '#2323fe';
  this.x = options.x || Math.random() * w;
  this.y = options.y || Math.random() * h;
  this.width = options.width || 2;
  this.direct = options.direct || Math.random() * Math.PI * 2;
  this.max = options.max || Math.round(Math.random() * 10 + 20);
  this.segments = [...new Array(this.max)].map(() => {
    return {
      direct: this.direct + (Math.PI * Math.random() * 0.2 - 0.1),
      length: Math.random() * 20 + 80,
      change: Math.random() * 0.04 - 0.02 };

  });

  this.update = function (index, array) {
    this.segments.forEach(s => {(s.direct += s.change) && Math.random() > 0.96 && (s.change *= -1);});
    this.lifespan > 0 && this.lifespan-- || this.remove(index, array);
  };

  this.render = function (ctx) {
    if (this.lifespan <= 0) return;
    ctx.beginPath();
    ctx.globalAlpha = this.lifespan / this.maxlife;
    ctx.strokeStyle = this.color;
    ctx.lineWidth = this.width;
    ctx.shadowBlur = 32;
    ctx.shadowColor = this.glow;
    ctx.moveTo(this.x, this.y);
    let prev = { x: this.x, y: this.y };
    this.segments.forEach(s => {
      const x = prev.x + Math.cos(s.direct) * s.length;
      const y = prev.y + Math.sin(s.direct) * s.length;
      prev = { x: x, y: y };
      ctx.lineTo(x, y);
    });
    ctx.stroke();
    ctx.closePath();
    ctx.shadowBlur = 0;
    const strength = Math.random() * 80 + 40;
    const light = ctx.createRadialGradient(this.x, this.y, 0, this.x, this.y, strength);
    light.addColorStop(0, 'rgba(250, 200, 50, 0.6)');
    light.addColorStop(0.1, 'rgba(250, 200, 50, 0.2)');
    light.addColorStop(0.4, 'rgba(250, 200, 50, 0.06)');
    light.addColorStop(0.65, 'rgba(250, 200, 50, 0.01)');
    light.addColorStop(0.8, 'rgba(250, 200, 50, 0)');
    ctx.beginPath();
    ctx.fillStyle = light;
    ctx.arc(this.x, this.y, strength, 0, Math.PI * 2);
    ctx.fill();
    ctx.closePath();
  };

  this.remove = function (index, array) {
    array.splice(index, 1);
  };
}

function Spark(options) {
  options = options || {};
  this.x = options.x || w * 0.5;
  this.y = options.y || h * 0.5;
  this.v = options.v || { direct: Math.random() * Math.PI * 2, weight: Math.random() * 14 + 2, friction: 0.88 };
  this.a = options.a || { change: Math.random() * 0.4 - 0.2, min: this.v.direct - Math.PI * 0.4, max: this.v.direct + Math.PI * 0.4 };
  this.g = options.g || { direct: Math.PI * 0.5 + (Math.random() * 0.4 - 0.2), weight: Math.random() * 0.25 + 0.25 };
  this.width = options.width || Math.random() * 3;
  this.lifespan = options.lifespan || Math.round(Math.random() * 20 + 40);
  this.maxlife = this.lifespan;
  this.color = options.color || '#feca32';
  this.prev = { x: this.x, y: this.y };

  this.update = function (index, array) {
    this.prev = { x: this.x, y: this.y };
    this.x += Math.cos(this.v..........完整代码请登录后点击上方下载按钮下载查看