function getRandomInt(min, max) { min = Math.ceil(min); max = Math.floor(max); return Math.floor(Math.random() * (max - min + 1)) + min; } class ScreenEffect { constructor(parent, options) { this.parent = parent; if (typeof parent === "string") { this.parent = document.querySelector(parent); } this.config = Object.assign({}, { // }, options) this.effects = {}; this.events = { resize: this.onResize.bind(this) }; window.addEventListener("resize", this.events.resize, false); this.render(); } render() { const container = document.createElement("div"); container.classList.add("screen-container"); const wrapper1 = document.createElement("div"); wrapper1.classList.add("screen-wrapper"); const wrapper2 = document.createElement("div"); wrapper2.classList.add("screen-wrapper"); const wrapper3 = document.createElement("div"); wrapper3.classList.add("screen-wrapper"); wrapper1.appendChild(wrapper2); wrapper2.appendChild(wrapper3); container.appendChild(wrapper1); this.parent.parentNode.insertBefore(container, this.parent); wrapper3.appendChild(this.parent); this.nodes = { container, wrapper1, wrapper2, wrapper3 }; this.onResize(); } onResize(e) { this.rect = this.parent.getBoundingClientRect(); if (this.effects.vcr && !!this.effects.vcr.enabled) { this.generateVCRNoise(); } } add(type, options) { const config = Object.assign({}, { fps: 30, blur: 1 }, options); if (Array.isArray(type)) { for (const t of type) { this.add(t); } return this; } const that = this; if (type === "snow") { const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); canvas.classList.add(type); canvas.width = this.rect.width / 2; canvas.height = this.rect.height / 2; this.nodes.wrapper2.appendChild(canvas); animate(); // that.generateSnow(ctx); function animate() { that.generateSnow(ctx); that.snowframe = requestAnimationFrame(animate); } this.effects[type] = { wrapper: this.nodes.wrapper2, node: canvas, enabled: true, config }; return this; } if (type === "roll") { return this.enableRoll(); } if (type === "vcr") { const canvas = document.createElement("canvas"); canvas.classList.add(type); this.nodes.wrapper2.appendChild(canvas); canvas.width = this.rect.width; canvas.height = this.rect.height; this.effects[type] = { wrapper: this.nodes.wrapper2, node: canvas, ctx: canvas.getContext("2d"), enabled: true, config }; this.generateVCRNoise(); return this; } let node = false; let wrapper = this.nodes.wrapper2; switch (type) { case "wobblex": case "wobbley": wrapper.classList.add(type); break; case "scanlines": node = document.createElement("div"); node.classList.add(type); wrapper.appendChild(node); break; case "vignette": wrapper = this.nodes.container; node = document.createElement("div"); node.classList.add(type); wrapper.appendChild(node); break; case "image": wrapper = this.parent; node = document.createElement('img'); node.classList.add(type); node.src = config.src; wrapper.appendChild(node); break; case "video": wrapper = this.parent; node = document.createElement('video'); node.classList.add(type); node.src = config.src; node.crossOrigin = 'anonymous'; node.autoplay = true; node.muted = true; node.loop = true; wrapper.appendChild(node); break; } this.effects[type] = { wrapper, node, enabled: true, config }; return this; } remove(type) { const obj = this.effects[type]; if (type in this.effects && !!obj.enabled) { obj.enabled = false; if (type === "roll" && obj.original) { this.parent.appendChild(obj.original); } if (type === "vcr") { clearInterval(this.vcrInterval); } if (type === "snow") { cancelAnimationFrame(this.snowframe); } if (obj.node) { obj.wrapper.removeChild(obj.node); } else { obj.wrapper.classList.remove(type); } } return this; } enableRoll() { const el = this.parent.firstElementChild; if (el) { const div = document.createElement("div"); div.classList.add("roller"); this.parent.appendChild(div); div.appendChild(el); div.appendChild(el.cloneNode(true)); // if ( this.effects.vcr.enabled ) { // div.appendChild(this.effects.vcr.node); // } this.effects.roll = { enabled: true, wrapper: this.parent, node: div, original: el }; } } generateVCRNoise() { const canvas = this.effects.vcr.node; const config = this.effects.vcr.config; const div = this.effects.vcr.node; if (config.fps >= 60) { cancelAnimationFrame(this.vcrInterval); const animate = () => { this.renderTrackingNoise(); this.vcrInterval = requestAnimationFrame(animate); }; animate(); } else { clearInterval(this.vcrInterval); this.vcrInterval = setInterval(() => { this.renderTrackingNoise(); }, 1000 / config.fps); } } // Generate CRT noise generateSnow(ctx) { var w = ctx.canvas.width, h = ctx.canvas.height, d = ctx.createImageData(w, h), b = new Uint32Array(d.data.buffer), len = b.length; for (var i = 0; i < len; i++) { b[i] = ((255 * Math.random()) | 0) << 24; } ctx.putImageData(d, 0, 0); } renderTrackingNoise(radius = 2, xmax, ymax) { const canvas = this.effects.vcr.node; const ctx = this.effects.vcr.ctx; const config = this.effects.vcr.config; let posy1 = config.miny || 0; let posy2 = config.maxy || canvas.height; let posy3 = config.miny2 || 0; const num = config.num || 20; if (xmax === undefined) { xmax = canvas.width; } if (ymax === undefined) { ymax = canvas.height; } canvas.style.filter = `blur(${config.blur}px)`; ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.fillStyle = `#fff`; ctx.beginPath(); for (var i = 0; i <= num; i++) { var x = Math.random(i) * xmax; var y1 = getRandomInt(posy1 += 3, posy2); var y2 = getRandomInt(0, posy3 -= 3); ctx.fillRect(x, y1, radius, radius); ctx.fillRect(x, y2, radius, radius); ctx.fill(); this.renderTail(ctx, x, y1, radius); this.renderTail(ctx, x, y2, radius); } ctx.closePath(); } renderTail(ctx, x, y, radius) { const n = getRandomInt(1, 50); const dirs = [1, -1]; let rd = radius; const dir = dirs[Math.floor(Math.random() * dirs.length)]; for (let i = 0; i < n; i++) { const step = 0.01; let r = getRandomInt((rd -= step), radius); let dx = getRandomInt(1, 4); radius -= 0.1; dx *= dir; ctx.fillRect((x += dx), y, r, r); ctx.fill(); } } } const screen = new ScreenEffect("#screen", { }); const gui = new dat.GUI(); const config = { effects: { roll: { enabled: false, options: { speed: 1000 } }, image: { enabled: true, options: { src: "https://images.unsplash.com/photo-1505977404378-3a0e28ec6488?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ", blur: 1.2 } }, vignette: { enabled: true }, scanlines: { enabled: true }, vcr: { enabled: true, options: { opacity: 1, miny: 220, miny2: 220, num: 70, fps: 60 } }, wobbley: { enabled: true }, snow: { enabled: true, options: { opacity: 0.2 } }, }, }; const f1 = gui.addFolder("Effects"); const f2 = gui.addFolder("Snow"); const f3 = gui.addFolder("VCR"); const f4 = gui.addFolder("Roll"); const f5 = gui.addFolder("Image"); for (const effect in config.effects) { const type = config.effects[effect]; f1.add(type, "enabled").name(effect).onChange(bool => { if (bool) { screen.add(effect, config.effects[effect].options); } else { screen.remove(effect); } }); if (type.options) { let folder = effect === "vcr" || effect === "video" ? f3 : f2; for (const p in type.options) { if (p === "speed") { f4.add(type.options, p).min(100).step(1).max(10000).onChange(val => { screen.effects[effect].node.style.animationDuration = `${val}ms`; }); } if (p === "opacity") { folder.add(type.options, p).name(`${effect} opacity`).min(0).step(0.1).max(1).onChange(val => { screen.effects[effect].node.style.opacity = val; }); } if (p === "miny") { folder.add(type.options, p).name(`tracking`).min(0).step(0.1).max(400).onChange(val => { screen.effects[effect].config.miny = val; screen.effects[effect].config.miny2 = 400 - val; }); } if (p === "num") { folder.add(type.options, p).name(`tape age`).min(1).step(0.1).max(100).onChange(val => { screen.effects[effect].config.num = val; }); } if (p === "blur") { f5.add(type.options, p).name(`blur`).min(1).step(0.1).max(5).onChange(val => { if (effect === "vcr") { screen.effects[effect].config.blur = val; } else { screen.effects[effect].node.style.filter = `blur(${val}px)`; } }); } } } } f1.open(); f2.open(); f3.open(); f4.open(); f5.open(); setTimeout(() => { for (const prop in config.effects) { if (!!config.effects[prop].enabled) { screen.add(prop, config.effects[prop].options); } } }, 1000);
body { margin: 0; width: 100vw; height: 100vh; display: flex; align-items: center; justify-content: center; overflow: hidden; background-color: #000; } canvas { position: absolute; left: 0; top: 0; z-index: 9998; width: 100%; height: 100%; } canvas.snow { background-color: #aaa; opacity: 0.2; } #screen { width: 100%; height: 100%; background: transparent linear-gradient(to bottom, #85908c 0%, #323431 100%) repeat scroll 0 0; background-size: cover; } .screen-container { width: 840px; height: 560px; overflow: hidden; position: relative; } .screen-wrapper { position: relative; width: 100%; height: 100%; } .vcr { opacity: 0.6; } .video { -webkit-filter: blur(1px); filter: blur(1px); width: 100%; height: 100%; } .image { width: 100%; height: auto; -webkit-filter: blur(1.2px); filter: blur(1.2px); } .vignette { background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/86186/crt.png); width: 100%; height: 100%; position: absolute; left: 0; top: 0; background-repeat: no-repeat; background-size: 100% 100%; z-index: 10000; } .scanlines { width: 100%; height: 100%; position: absolute; left: 0; top: 0; z-index: 9999; background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06)); background-size: 100% 2px, 3px 100%; pointer-events: none; } .wobblex { -webkit-animation: wobblex 100ms infinite; animation: wobblex 100ms infinite; } .wobbley { -webkit-animation: wobbley 100ms infinite; animation: wobbley 100ms infinite; } .glitch { -webkit-animation: 5s ease 2000ms normal none infinite running glitch; animation: 5s ease 2000ms normal none infinite running glitch; } @-webkit-keyframes wobblex { 50% { -webkit-transform: translateX(1px); transform: translateX(1px); } 51% { -webkit-transform: translateX(0); transform: translateX(0); } } @keyframes wobblex { 50% { -webkit-transform: translateX(1px); transform: translateX(1px); } 51% { -webkit-transform: trans
