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+<html>
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+ <head>
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+ <meta charset="utf-8" />
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+ <title>loveHeart</title>
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+ <link
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+ rel="shortcut icon"
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+ href="http://zhouql.vip/images/心.png"
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+ type="image/x-icon"
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+ />
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+ <style>
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+ html,
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+ body {
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+ height: 100%;
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+ padding: 0;
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+ margin: 0;
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+ background: #000;
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+ }
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+ canvas {
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+ position: absolute;
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+ width: 100%;
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+ height: 100%;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <canvas id="pinkboard"></canvas>
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+ <script>
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+ var settings = {
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+ particles: {
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+ length: 500,
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+ duration: 2,
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+ velocity: 100,
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+ effect: -0.75,
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+ size: 32,
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+ },
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+ };
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+ (function () {
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+ var b = 0;
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+ var c = ["ms", "moz", "webkit", "o"];
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+ for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
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+ window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
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+ window.cancelAnimationFrame =
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+ window[c[a] + "CancelAnimationFrame"] ||
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+ window[c[a] + "CancelRequestAnimationFrame"];
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+ }
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+ if (!window.requestAnimationFrame) {
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+ window.requestAnimationFrame = function (h, e) {
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+ var d = new Date().getTime();
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+ var f = Math.max(0, 16 - (d - b));
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+ var g = window.setTimeout(function () {
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+ h(d + f);
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+ }, f);
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+ b = d + f;
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+ return g;
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+ };
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+ }
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+ if (!window.cancelAnimationFrame) {
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+ window.cancelAnimationFrame = function (d) {
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+ clearTimeout(d);
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+ };
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+ }
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+ })();
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+
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+ var Point = (function () {
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+ function Point(x, y) {
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+ this.x = typeof x !== "undefined" ? x : 0;
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+ this.y = typeof y !== "undefined" ? y : 0;
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+ }
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+ Point.prototype.clone = function () {
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+ return new Point(this.x, this.y);
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+ };
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+ Point.prototype.length = function (length) {
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+ if (typeof length == "undefined")
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+ return Math.sqrt(this.x * this.x + this.y * this.y);
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+ this.normalize();
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+ this.x *= length;
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+ this.y *= length;
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+ return this;
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+ };
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+ Point.prototype.normalize = function () {
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+ var length = this.length();
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+ this.x /= length;
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+ this.y /= length;
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+ return this;
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+ };
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+ return Point;
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+ })();
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+ var Particle = (function () {
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+ function Particle() {
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+ this.position = new Point();
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+ this.velocity = new Point();
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+ this.acceleration = new Point();
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+ this.age = 0;
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+ }
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+ Particle.prototype.initialize = function (x, y, dx, dy) {
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+ this.position.x = x;
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+ this.position.y = y;
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+ this.velocity.x = dx;
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+ this.velocity.y = dy;
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+ this.acceleration.x = dx * settings.particles.effect;
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+ this.acceleration.y = dy * settings.particles.effect;
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+ this.age = 0;
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+ };
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+ Particle.prototype.update = function (deltaTime) {
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+ this.position.x += this.velocity.x * deltaTime;
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+ this.position.y += this.velocity.y * deltaTime;
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+ this.velocity.x += this.acceleration.x * deltaTime;
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+ this.velocity.y += this.acceleration.y * deltaTime;
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+ this.age += deltaTime;
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+ };
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+ Particle.prototype.draw = function (context, image) {
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+ function ease(t) {
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+ return --t * t * t + 1;
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+ }
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+ var size = image.width * ease(this.age / settings.particles.duration);
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+ context.globalAlpha = 1 - this.age / settings.particles.duration;
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+ context.drawImage(
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+ image,
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+ this.position.x - size / 2,
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+ this.position.y - size / 2,
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+ size,
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+ size
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+ );
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+ };
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+ return Particle;
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+ })();
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+ var ParticlePool = (function () {
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+ var particles,
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+ firstActive = 0,
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+ firstFree = 0,
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+ duration = settings.particles.duration;
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+ function ParticlePool(length) {
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+ // create and populate particle pool
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+ particles = new Array(length);
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+ for (var i = 0; i < particles.length; i++)
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+ particles[i] = new Particle();
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+ }
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+ ParticlePool.prototype.add = function (x, y, dx, dy) {
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+ particles[firstFree].initialize(x, y, dx, dy);
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+ // handle circular queue
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+ firstFree++;
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+ if (firstFree == particles.length) firstFree = 0;
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+ if (firstActive == firstFree) firstActive++;
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+ if (firstActive == particles.length) firstActive = 0;
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+ };
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+ ParticlePool.prototype.update = function (deltaTime) {
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+ var i;
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+ // update active particles
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+ if (firstActive < firstFree) {
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+ for (i = firstActive; i < firstFree; i++)
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+ particles[i].update(deltaTime);
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+ }
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+ if (firstFree < firstActive) {
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+ for (i = firstActive; i < particles.length; i++)
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+ particles[i].update(deltaTime);
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+ for (i = 0; i < firstFree; i++) particles[i].update(deltaTime);
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+ }
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+ // remove inactive particles
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+ while (
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+ particles[firstActive].age >= duration &&
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+ firstActive != firstFree
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+ ) {
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+ firstActive++;
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+ if (firstActive == particles.length) firstActive = 0;
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+ }
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+ };
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+ ParticlePool.prototype.draw = function (context, image) {
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+ // draw active particles
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+ if (firstActive < firstFree) {
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+ for (i = firstActive; i < firstFree; i++)
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+ particles[i].draw(context, image);
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+ }
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+ if (firstFree < firstActive) {
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+ for (i = firstActive; i < particles.length; i++)
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+ particles[i].draw(context, image);
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+ for (i = 0; i < firstFree; i++) particles[i].draw(context, image);
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+ }
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+ };
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+ return ParticlePool;
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+ })();
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+ (function (canvas) {
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+ var context = canvas.getContext("2d"),
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+ particles = new ParticlePool(settings.particles.length),
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+ particleRate =
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+ settings.particles.length / settings.particles.duration, // particles/sec
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+ time;
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+ // get point on heart with -PI <= t <= PI
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+ function pointOnHeart(t) {
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+ return new Point(
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+ 160 * Math.pow(Math.sin(t), 3),
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+ 130 * Math.cos(t) -
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+ 50 * Math.cos(2 * t) -
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+ 20 * Math.cos(3 * t) -
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+ 10 * Math.cos(4 * t) +
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+ 25
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+ );
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+ }
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+ // creating the particle image using a dummy canvas
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+ var image = (function () {
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+ var canvas = document.createElement("canvas"),
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+ context = canvas.getContext("2d");
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+ canvas.width = settings.particles.size;
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+ canvas.height = settings.particles.size;
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+ // helper function to create the path
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+ function to(t) {
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+ var point = pointOnHeart(t);
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+ point.x =
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+ settings.particles.size / 2 +
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+ (point.x * settings.particles.size) / 350;
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+ point.y =
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+ settings.particles.size / 2 -
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+ (point.y * settings.particles.size) / 350;
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+ return point;
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+ }
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+ // create the path
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+ context.beginPath();
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+ var t = -Math.PI;
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+ var point = to(t);
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+ context.moveTo(point.x, point.y);
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+ while (t < Math.PI) {
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+ t += 0.01; // baby steps!
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+ point = to(t);
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+ context.lineTo(point.x, point.y);
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+ }
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+ context.closePath();
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+ // create the fill
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+ context.fillStyle = "#ea80b0";
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+ context.fill();
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+ // create the image
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+ var image = new Image();
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+ image.src = canvas.toDataURL();
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+ return image;
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+ })();
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+ // render that thing!
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+ function render() {
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+ // next animation frame
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+ requestAnimationFrame(render);
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+ // update time
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+ var newTime = new Date().getTime() / 1000,
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+ deltaTime = newTime - (time || newTime);
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+ time = newTime;
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+ // clear canvas
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+ context.clearRect(0, 0, canvas.width, canvas.height);
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+ // create new particles
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+ var amount = particleRate * deltaTime;
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+ for (var i = 0; i < amount; i++) {
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+ var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
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+ var dir = pos.clone().length(settings.particles.velocity);
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+ particles.add(
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+ canvas.width / 2 + pos.x,
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+ canvas.height / 2 - pos.y,
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+ dir.x,
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+ -dir.y
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+ );
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+ }
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+ // update and draw particles
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+ particles.update(deltaTime);
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+ particles.draw(context, image);
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+ }
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+ // handle (re-)sizing of the canvas
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+ function onResize() {
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+ canvas.width = canvas.clientWidth;
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+ canvas.height = canvas.clientHeight;
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+ }
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+ window.onresize = onResize;
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+ // delay rendering bootstrap
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+ setTimeout(function () {
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+ onResize();
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+ render();
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+ }, 10);
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+ })(document.getElementById("pinkboard"));
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+ </script>
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+ </body>
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+</html>
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tianyun