Плавающие лучи и частицы на HTML5 Canvas
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#canvas { position: absolute; z-index: 0; top: 0; left: 0; height: 100vh; width: 100vw; background-image: -webkit-linear-gradient(#3f3f34, #1f1f12); background-image: linear-gradient(#3f3f34, #1f1f12); } #title { position: absolute; top: 60%; left: 0; z-index: 1; width: 100%; margin: 0; padding: 0; font-size: 3em; text-align: center; color: #ffffff; mix-blend-mode: overlay; } |
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<canvas id="canvas"></canvas> <h1 id="title"></h1> <form> <label id="ray-count" for="ray-input">Rays: 50</label> <input type="range" id="ray-input" min="0" max="100"/> <label id="particle-count" for="particle-input">Particles: 50</label> <input type="range" id="particle-input" min="0" max="100"/> </form> <script> (function(window, document, undefined) { var canvas, ctx, rect, height, width, objects, numParticles, numRays, pInput, rInput, rCount, pCount, title, titleStr; var Ray = function() { this.ctx = ctx; this.angle = (105 * Math.PI) / 180; this.init = function() { this.velocity = 0.25 - Math.random() * 0.5; this.len = (canvas.height / 2) + Math.random() * (canvas.height / 2); this.start = { x: Math.random() * (canvas.width + 100) - 50, y: 0 }; this.end = { x: this.start.x + this.len * Math.cos(this.angle), y: this.start.y + this.len * Math.sin(this.angle) }; this.ttl = 100 + Math.random() * 200; this.life = 0; this.width = 0.5 + Math.random() * 4; this.hue = Math.round(45 + Math.random() * 15).toString(); this.saturation = Math.round(20 + Math.random() * 40).toString(); }; this.color = function() { var alpha = wave(this.life, this.ttl) * 0.005, color1 = 'hsla(' + this.hue + ',' + this.saturation + '%,' + '60%,' + alpha.toString() + ')', color2 = 'hsla(50,20%,20%,0)', gradient = ctx.createLinearGradient(this.start.x, this.start.y, this.end.x, this.end.y); gradient.addColorStop(0, color1); gradient.addColorStop(1, color2); return gradient; } this.draw = function(c) { this.ctx.beginPath(); this.ctx.strokeStyle = this.color(); this.ctx.lineWidth = this.width; this.ctx.moveTo(this.start.x, this.start.y); this.ctx.lineTo(this.end.x, this.end.y); this.ctx.stroke(); this.ctx.closePath(); }; this.update = function() { if (this.life > this.ttl) { this.init(); } else { this.life++; this.start.x += this.velocity; this.end.x += this.velocity; } }; this.init(); return this; }; var Particle = function() { this.ctx = ctx; this.init = function() { this.position = { x: Math.random() * width, y: height / 2 + Math.random() * height / 2 }; this.velocity = { x: 0.5 - Math.random() * 1, y: 0.5 - Math.random() * 1 }; this.ttl = 100 + Math.random() * 200; this.life = 0; this.size = 1 + Math.random() * 10; }; this.color = function() { var alpha = wave(this.life, this.ttl) * 0.005, color = 'hsla(50,50%,25%,' + alpha.toString() + ')'; return color; }; this.draw = function() { this.ctx.beginPath(); this.ctx.fillStyle = this.color(); this.ctx.moveTo(this.position.x, this.position.y); this.ctx.arc(this.position.x, this.position.y, this.size, 0, Math.PI * 2); this.ctx.fill(); this.ctx.closePath(); }; this.update = function() { if (this.life > this.ttl) { this.init(); } else { this.life++; this.position.x += this.velocity.x; this.position.y += this.velocity.y; } }; this.init(); return this; }; function onResize() { rect = canvas.getBoundingClientRect(); height = rect.height; width = rect.width; canvas.height = height; canvas.width = width; } function requestAnimationFrame() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); }; } function wave(t, a) { //function credit to http://stackoverflow.com/questions/26590800/how-can-we-increment-and-then-decrement-a-counter-without-conditionals return Math.abs(((t + a / 2) % a) - a / 2); } function setTitle() { if (numRays > 0 && numParticles > 0) titleStr = ''; else if (numRays > 0 && numParticles === 0) titleStr = 'Rays'; else if (numRays === 0 && numParticles > 0) titleStr = 'Particles'; else if (numRays === 0 && numParticles === 0) titleStr = '¯\\_(ツ)_/¯'; title.innerHTML = titleStr; } function createObjects() { numRays = parseInt(rInput.value); numParticles = parseInt(pInput.value); setTitle(); objects = []; for (var i = 0; i < numParticles; i++) { var particle = new Particle(); objects.push(particle); } for (var i = 0; i < numRays; i++) { var ray = new Ray(); objects.push(ray); } } function render(c) { c.clearRect(0, 0, width, height); c.shadowBlur = 30; c.shadowColor = 'white'; c.globalCompositeOperation = 'lighter'; for (var i = 0, len = objects.length; i < len; i++) { var object = objects[i]; object.update(); object.draw(); } } function loop() { render(ctx); window.requestAnimationFrame(loop); } function init() { canvas = document.getElementById('canvas'); ctx = canvas.getContext('2d'); title = document.getElementById('title'); rInput = document.getElementById('ray-input'); rCount = document.getElementById('ray-count'); rInput.oninput = function() { rCount.innerHTML = 'Rays: ' + this.value.toString(); createObjects(); }; pInput = document.getElementById('particle-input'); pCount = document.getElementById('particle-count'); pInput.oninput = function() { pCount.innerHTML = 'Particles: ' + this.value.toString(); createObjects(); }; onResize(); createObjects(); loop(); } window.onload = init; window.onresize = onResize; window.requestAnimationFrame = (requestAnimationFrame)(); })(this, document); </script> |
Автор публикации
Я не понял вашего вопроса, но постараюсь на него ответить...
Это как раз то, что искала! Спасибо тебе, добрый человек, огромное человеческое спасибо :*
Пожалуйста 😃