念楠竹html闪电绘制文字动画特效，效果还是非常好看的
效果图：
演示地址：http://艹.host/html闪电绘制文字动画特效演示.html
完整代码：
<!doctype html> <html> <head> <meta charset="utf-8"> <title>html5 canvas闪电绘制文字动画特效www.niannz.com</title> <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> <div class="page page-thunder-to-text"> <input id="input" type="text" maxlength="24" placeholder="念楠竹网站-创新科技未来"> <canvas id="canvas"></canvas> </div> <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.direct) * this.v.weight; this.x += Math.cos(this.g.direct) * this.g.weight; this.y += Math.sin(this.v.direct) * this.v.weight; this.y += Math.sin(this.g.direct) * this.g.weight; this.v.weight > 0.2 && (this.v.weight *= this.v.friction); this.v.direct += this.a.change; (this.v.direct > this.a.max || this.v.direct < this.a.min) && (this.a.change *= -1); this.lifespan > 0 && this.lifespan--; this.lifespan <= 0 && 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.moveTo(this.x, this.y); ctx.lineTo(this.prev.x, this.prev.y); ctx.stroke(); ctx.closePath(); } this.remove = function(index, array) { array.splice(index, 1); } } function Particles(options) { options = options || {}; this.max = options.max || Math.round(Math.random() * 10 + 10); this.sparks = [...new Array(this.max)].map(() => new Spark(options)); this.update = function() { this.sparks.forEach((s, i) => s.update(i, this.sparks)); } this.render = function(ctx) { this.sparks.forEach(s => s.render(ctx)); } } function Text(options) { options = options || {}; const pool = document.createElement('canvas'); const buffer = pool.getContext('2d'); pool.width = w; buffer.fillStyle = '#000000'; buffer.fillRect(0, 0, pool.width, pool.height); this.size = options.size || 100; this.copy = (options.copy || `Hello!`) + ' '; this.color = options.color || '#cd96fe'; this.delay = options.delay || 5; this.basedelay = this.delay; buffer.font = `${this.size}px Comic Sans MS`; this.bound = buffer.measureText(this.copy); this.bound.height = this.size * 1.5; this.x = options.x || w * 0.5 - this.bound.width * 0.5; this.y = options.y || h * 0.5 - this.size * 0.5; buffer.strokeStyle = this.color; buffer.strokeText(this.copy, 0, this.bound.height * 0.8); this.data = buffer.getImageData(0, 0, this.bound.width, this.bound.height); this.index = 0; this.update = function() { if (this.index >= this.bound.width) { this.index = 0; return; } const data = this.data.data; for (let i = this.index * 4; i < data.length; i += (4 * this.data.width)) { const bitmap = data[i] + data[i + 1] + data[i + 2] + data[i + 3]; if (bitmap > 255 && Math.random() > 0.96) { const x = this.x + this.index; const y = this.y + (i / this.bound.width / 4); thunder.push(new Thunder({ x: x, y: y })); Math.random() > 0.5 && particles.push(new Particles({ x: x, y: y })); } } if (this.delay-- < 0) { this.index++; this.delay += this.basedelay; } } this.render = function(ctx) { ctx.putImageData(this.data, this.x, this.y, 0, 0, this.index, this.bound.height); } } function loop() { update(); render(); requestAnimationFrame(loop); } function update() { text.update(); thunder.forEach((l, i) => l.update(i, thunder)); particles.forEach(p => p.update()); } function render() { ctx.globalCompositeOperation = 'source-over'; ctx.globalAlpha = 1; ctx.fillStyle = '#000000'; ctx.fillRect(0, 0, w, h); // ctx.globalCompositeOperation = 'screen'; text.render(ctx); thunder.forEach(l => l.render(ctx)); particles.forEach(p => p.render(ctx)); } (function () { // canvas = document.getElementById('canvas'); input = document.getElementById('input'); ctx = canvas.getContext('2d'); w = window.innerWidth; h = window.innerHeight; canvas.width = w; canvas.height = h; thunder = []; particles = []; // text = new Text({ copy: 'www.niannz.com' }); canvas.addEventListener('click', (e) => { const x = e.clientX; const y = e.clientY; thunder.push(new Thunder({ x: x, y: y })); particles.push(new Particles({ x: x, y: y })); }); let cb = 0; input.addEventListener('keyup', (e) => { clearTimeout(cb); cb = setTimeout(() => { text = new Text({ copy: input.value }); }, 300); }); // loop(); })() </script> <div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';"> <p></p> <p></p> </div> </body> </html>
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