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实现JavaScript溢出动态爱情效果的演示示例代码

运维开发网 https://www.qedev.com 2022-05-29 21:46 出处:网络
这篇文章主要为大家介绍了如何利用JavaScript制作出简单的外溢动态爱心的效果,文中的示例代码讲解详细,感兴趣的小伙伴快跟随小编一起动手试一试

这篇文章主要为大家介绍了如何利用JavaScript制作出简单的外溢动态爱心的效果,文中的示例代码讲解详细,感兴趣的小伙伴快跟随小编一起动手试一试

你还在为节日送女朋友什么礼物而烦恼吗?最近用JavaScript制作了一个溢出动态爱情的效果,还可以在爱情上填你想要的字!赶紧学起来,给女朋友diy一个。

效果演示


源代码介绍

( function() { var b=0; var c=["ms","moz","webkit","o"]; for(var a=0;alt;c.lengthamp;amp;!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 lt; 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 lt; firstFree) { for (i = firstActive; i lt; firstFree; i++) particles[i].update(deltaTime); } if (firstFree lt; firstActive) { for (i = firstActive; i lt; particles.length; i++) particles[i].update(deltaTime); for (i = 0; i lt; firstFree; i++) particles[i].update(deltaTime); } // remove inactive particles while (particles[firstActive].age gt;= duration amp;amp; firstActive != firstFree) { firstActive++; if (firstActive == particles.length) firstActive = 0; } }; ParticlePool.prototype.draw = function(context, image) { // draw active particles if (firstActive lt; firstFree) { for (i = firstActive; i lt; firstFree; i++) particles[i].draw(context, image); } if (firstFree lt; firstActive) { for (i = firstActive; i lt; particles.length; i++) particles[i].draw(context, image); for (i = 0; i lt; 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 lt;= t lt;= 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 lt; 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 lt; 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'));

源代码

以上是JavaScript实现溢出动态爱情效果的示例代码的详细内容。更多关于JavaScript动态爱情的信息

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