html的爱心小特效。

极具浪漫主义色彩的菜鸟学习之路

2024-04-23 帮助1人

hello，分享一个好玩的，我想大家大家有时候也是比较累吧，最近这个特效也是很火，我就拔来了一下源码，这里和大家看一下，

【爱心代码｜源码在视频简介｜这次一定！】 https://www.bilibili.com/video/BV1Ye411F7EZ/?share_source=copy_web&vd_source=385ba0043075be7c24c4aeb4aaa73352

爱心代码｜源码在视频简介｜这次一定！

学新通

代码在这里：

<html>
<head>
    <meta charset="utf-8">
    <title>loveHeart</title>
    <link rel="shortcut icon" href="http://zhouql.vip/images/心.png" type="image/x-icon">
    <style>
        html,
        body {
            height: 100%;
            padding: 0;
            margin: 0;
            background: #000;
        }
        canvas {
            position: absolute;
            width: 100%;
            height: 100%;
        }
        p{
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
            color: pink;
            animation: k 1.5s ease-in-out infinite;
        }
        @keyframes k{
            100%{
                font-size: 24px;
                opacity: 0;
            }
        }
    </style>
</head>
<body>
    <p>致我最爱的夏子恬小朋友</p>
    <canvas id="pinkboard"></canvas>
    <script>
        var settings = {
            particles: {
                length: 600,  // 爱心的大小
                duration: 2,  // 爱心扩散速度，越小速度越快
                velocity: 100,  // 爱心扩散速度，越小速度越慢
                effect: -0.75, // 爱心收缩效果，比如：1扩散，-2收缩
                size: 26, // 爱心数量
            },
        };
        (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) {
                // 创建并填充粒子池
                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);
                // 处理循环队列
                firstFree  ;
                if (firstFree == particles.length) firstFree = 0;
                if (firstActive == firstFree) firstActive  ;
                if (firstActive == particles.length) firstActive = 0;
            };
            ParticlePool.prototype.update = function (deltaTime) {
                var i;
                // 更新活性粒子
                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);
                }
                // 去除非活性颗粒
                while (particles[firstActive].age >= duration && firstActive != firstFree) {
                    firstActive  ;
                    if (firstActive == particles.length) firstActive = 0;
                }
            };
            ParticlePool.prototype.draw = function (context, image) {
                // 绘制活性粒子
                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;
            // 用 -PI <= t <= PI 获得心脏点
            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
                );
            }
            // 使用虚拟画布创建粒子图像
            var image = (function () {
                var canvas = document.createElement('canvas'),
                    context = canvas.getContext('2d');
                canvas.width = settings.particles.size;
                canvas.height = settings.particles.size;
                //用于创建路径的帮助程序函数
                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;
                }
                // 创建路径
                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();
                // 创建填充
                context.fillStyle = '#ea80b0';
                context.fill();
                // 创建映像
                var image = new Image();
                image.src = canvas.toDataURL();
                return image;
            })();
            // 渲染那个东西！
            function render() {
                // 下一个动画帧
                requestAnimationFrame(render);
                // 更新时间
                var newTime = new Date().getTime() / 1000,
                    deltaTime = newTime - (time || newTime);
                time = newTime;
                // 透明画布，清楚画布
                context.clearRect(0, 0, canvas.width, canvas.height);
                // 创建新粒子
                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);
                }
                //更新和绘制粒子
                particles.update(deltaTime);
                particles.draw(context, image);
            }
            // 处理（重新）调整画布的大小
            function onResize() {
                canvas.width = canvas.clientWidth;
                canvas.height = canvas.clientHeight;
            }
            window.onresize = onResize;
            // 延迟渲染引导
            setTimeout(function () {
                onResize();
                render();
            }, 10);
        })(document.getElementById('pinkboard'));
        </script>
</body>

</html>

，人家写的就是不一样，这个Javascrip,还是要学好Javascrip，不然难办，这里的代码看起来都是迷迷糊糊的。

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