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html--心花怒放

时间:2024-03-25 18:21:16 来源:网络cs 作者:康由 栏目:数据分析 阅读:

标签: 怒放 

代码

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Canvas 绘制一个❤</title>    <link rel="shortcut icon" href="../../assets/images/icon/favicon.ico" type="image/x-icon">    <style>        html,        body {            height: 100%;            padding: 0;            margin: 0;        }        canvas {            position: absolute;            width: 100%;            height: 100%;        }    </style></head><body>    <canvas id="pinkboard">        Canvas Not Support    </canvas>    <script>        /*     * Settings     */        var settings = {            particles: {                length: 500, // maximum amount of particles                duration: 2, // particle duration in sec                velocity: 100, // particle velocity in pixels/sec                effect: -0.75, // play with this for a nice effect                size: 30, // particle size in pixels            },        };        /*         * RequestAnimationFrame polyfill by Erik M?ller         */        (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)                }            }        }()        );        /*         * Point class         */        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;        })();        /*         * Particle class         */        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;        })();        /*         * ParticlePool class         */        var ParticlePool = (function () {            var particles,                firstActive = 0,                firstFree = 0,                duration = settings.particles.duration;            function ParticlePool(length) {                // create and populate particle pool                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);                // handle circular queue                firstFree++;                if (firstFree == particles.length) firstFree = 0;                if (firstActive == firstFree) firstActive++;                if (firstActive == particles.length) firstActive = 0;            };            ParticlePool.prototype.update = function (deltaTime) {                var i;                // update active particles                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);                }                // remove inactive particles                while (particles[firstActive].age >= duration && firstActive != firstFree) {                    firstActive++;                    if (firstActive == particles.length) firstActive = 0;                }            };            ParticlePool.prototype.draw = function (context, image) {                // draw active particles                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;        })();        /*         * Putting it all together         */        (function (canvas) {            var context = canvas.getContext('2d'),                particles = new ParticlePool(settings.particles.length),                particleRate = settings.particles.length / settings.particles.duration, // particles/sec                time;            // get point on heart with -PI <= t <= PI            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                );            }            // creating the particle image using a dummy canvas            var image = (function () {                var canvas = document.createElement('canvas'),                    context = canvas.getContext('2d');                canvas.width = settings.particles.size;                canvas.height = settings.particles.size;                // helper function to create the path                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;                }                // create the path                context.beginPath();                var t = -Math.PI;                var point = to(t);                context.moveTo(point.x, point.y);                while (t < Math.PI) {                    t += 0.01; // baby steps!                    point = to(t);                    context.lineTo(point.x, point.y);                }                context.closePath();                // create the fill                context.fillStyle = '#ea80b0';                context.fill();                // create the image                var image = new Image();                image.src = canvas.toDataURL();                return image;            })();            // render that thing!            function render() {                // next animation frame                requestAnimationFrame(render);                // update time                var newTime = new Date().getTime() / 1000,                    deltaTime = newTime - (time || newTime);                time = newTime;                // clear canvas                context.clearRect(0, 0, canvas.width, canvas.height);                // create new particles                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);                }                // update and draw particles                particles.update(deltaTime);                particles.draw(context, image);            }            // handle (re-)sizing of the canvas            function onResize() {                canvas.width = canvas.clientWidth;                canvas.height = canvas.clientHeight;            }            window.onresize = onResize;            // delay rendering bootstrap            setTimeout(function () {                onResize();                render();            }, 10);        })(document.getElementById('pinkboard'));    </script></body></html>

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