基于 HTML5 的爱心表白动画特效原创
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编辑于2022年11月30日 21:02:40
从视觉上看,它也是一个爱心轮廓,但是不同的是这个爱心轮廓由许多跳动的小爱心组成,更加有一种3D立体的效果。
1. 运行效果
![在这里插入图片描述](https://static001.geekbang.org/infoq/a2/a224e2a46e19c7388737ce389332a680.gif)
2. 代码构成
<!doctype html> <html> <head> <meta charset="utf-8"> <title>爱心表白</title> <style> html, body { height: 100%; padding: 0; margin: 0; background: #000; } canvas { width: 100%; height: 100%; } </style> </head> <body> <div style="text-align:center;clear:both;"> <script src="/gg_bd_ad_720x90.js" type="text/javascript"></script> <script src="/follow.js" type="text/javascript"></script> </div> <canvas id="pinkboard"></canvas> <script> var settings = { particles: { length: 500, duration: 2, velocity: 100, effect: -0.75, size: 30, }, }; (function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}()); var Point = (function() { function Point(x, y) { this.x = (typeof x !== 'undefined') ? x : 0; this.y = (typeof y !== 'undefined') ? y : 0; } Point.prototype.clone = function() { return new Point(this.x, this.y); }; Point.prototype.length = function(length) { if (typeof length == 'undefined') return Math.sqrt(this.x * this.x + this.y * this.y); this.normalize(); this.x *= length; this.y *= length; return this; }; Point.prototype.normalize = function() { var length = this.length(); this.x /= length; this.y /= length; return this; }; return Point; })(); var Particle = (function() { function Particle() { this.position = new Point(); this.velocity = new Point(); this.acceleration = new Point(); this.age = 0; } Particle.prototype.initialize = function(x, y, dx, dy) { this.position.x = x; this.position.y = y; this.velocity.x = dx; this.velocity.y = dy; this.acceleration.x = dx * settings.particles.effect; this.acceleration.y = dy * settings.particles.effect; this.age = 0; }; Particle.prototype.update = function(deltaTime) { this.position.x += this.velocity.x * deltaTime; this.position.y += this.velocity.y * deltaTime; this.velocity.x += this.acceleration.x * deltaTime; this.velocity.y += this.acceleration.y * deltaTime; this.age += deltaTime; }; Particle.prototype.draw = function(context, image) { function ease(t) { return (--t) * t * t + 1; } var size = image.width * ease(this.age / settings.particles.duration); context.globalAlpha = 1 - this.age / settings.particles.duration; context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size); }; return Particle; })(); var ParticlePool = (function() { var particles, firstActive = 0, firstFree = 0, duration = settings.particles.duration; function ParticlePool(length) { particles = new Array(length); for (var i = 0; i < particles.length; i++) particles[i] = new Particle(); } ParticlePool.prototype.add = function(x, y, dx, dy) { particles[firstFree].initialize(x, y, dx, dy); firstFree++; if (firstFree == particles.length) firstFree = 0; if (firstActive == firstFree ) firstActive++; if (firstActive == particles.length) firstActive = 0; }; ParticlePool.prototype.update = function(deltaTime) { var i; if (firstActive < firstFree) { for (i = firstActive; i < firstFree; i++) particles[i].update(deltaTime); } if (firstFree < firstActive) { for (i = firstActive; i < particles.length; i++) particles[i].update(deltaTime); for (i = 0; i < firstFree; i++) particles[i].update(deltaTime); } while (particles[firstActive].age >= duration && firstActive != firstFree) { firstActive++; if (firstActive == particles.length) firstActive = 0; } }; ParticlePool.prototype.draw = function(context, image) { if (firstActive < firstFree) { for (i = firstActive; i < firstFree; i++) particles[i].draw(context, image); } if (firstFree < firstActive) { for (i = firstActive; i < particles.length; i++) particles[i].draw(context, image); for (i = 0; i < firstFree; i++) particles[i].draw(context, image); } }; return ParticlePool; })(); (function(canvas) { var context = canvas.getContext('2d'), particles = new ParticlePool(settings.particles.length), particleRate = settings.particles.length / settings.particles.duration, // particles/sec time; function pointOnHeart(t) { return new Point( 160 * Math.pow(Math.sin(t), 3), 130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25 ); } var image = (function() { var canvas = document.createElement('canvas'), context = canvas.getContext('2d'); canvas.width = settings.particles.size; canvas.height = settings.particles.size; function to(t) { var point = pointOnHeart(t); point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350; point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350; return point; } context.beginPath(); var t = -Math.PI; var point = to(t); context.moveTo(point.x, point.y); while (t < Math.PI) { t += 0.01; point = to(t); context.lineTo(point.x, point.y); } context.closePath(); context.fillStyle = '#ea80b0'; context.fill(); var image = new Image(); image.src = canvas.toDataURL(); return image; })(); function render() { requestAnimationFrame(render); var newTime = new Date().getTime() / 1000, deltaTime = newTime - (time || newTime); time = newTime; context.clearRect(0, 0, canvas.width, canvas.height); var amount = particleRate * deltaTime; for (var i = 0; i < amount; i++) { var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random()); var dir = pos.clone().length(settings.particles.velocity); particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y); } particles.update(deltaTime); particles.draw(context, image); } function onResize() { canvas.width = canvas.clientWidth; canvas.height = canvas.clientHeight; } window.onresize = onResize; setTimeout(function() { onResize(); render(); }, 10); })(document.getElementById('pinkboard')); </script> </body> </html>
以上就是采用HTML代码编写的程序,还可以外加CSS进行点缀,让效果更佳美观。
3. 代码截图
![](https://static001.geekbang.org/infoq/d4/d4f2e788a71707422791311263b290c6.png)
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