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starry.js
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starry.js
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const debounce = (fn, timeout = 300) => {
let timer
return (...args) => {
clearTimeout(timer)
timer = setTimeout(() => fn.apply(this, args), timeout)
}
}
document.addEventListener('DOMContentLoaded', () => {
const city = document.getElementById('city')
const dot = document.getElementById('dot')
const sky = document.getElementById('sky')
let buildings
let dimensions
let highest
const animate = (frame = 0) => {
frame % 2 === 0 && newStar()
frame % 80 === 0 && switchDot()
switchWindow()
window.requestAnimationFrame(() => animate(++frame))
}
const gauss = number => {
return (number * (number + 1)) / 2
}
const newBuilding = () => {
const building = document.createElement('div')
const height = Math.round(Math.floor(Math.random() * (dimensions.city.height - dimensions.city.height / 8)) + dimensions.city.height / 8)
const width = Math.round(Math.floor(Math.random() * (dimensions.city.height / 4)) + dimensions.city.height / 4)
const left = Math.round(Math.floor(Math.random() * dimensions.city.width) - width / 2)
const windowFrame = Math.floor(Math.random() * 3) + 3
const windowSize = Math.random() * 3 > 1 ? 2 : 1
building.classList.add('building')
building.style.height = `${height}px`
building.style.left = `${left}px`
building.style.width = `${width}px`
for (let i = 0; i < Math.floor(height / (windowFrame * 2 + windowSize)); i++) {
const floor = newFloor(width, windowFrame, windowSize)
building.appendChild(floor)
}
city.appendChild(building)
if (!highest || height > highest.height) {
highest = { building, height, left, width }
}
return building
}
const newFloor = (width, windowFrame, windowSize) => {
const floor = document.createElement('div')
floor.className = 'floor'
floor.style.height = `${windowFrame * 2 + windowSize}px`
for (let i = 0; i < Math.floor(width / (windowFrame * 2 + windowSize)); i++) {
const color = ['#999900', '#999966', '#cccc00', '#cccc66', '#eeee00', '#eeee66', '#ffff00'][Math.floor(Math.random() * 7)]
const window = document.createElement('span')
window.className = 'window'
if (windowSize === 1) {
window.style.backgroundColor = color
} else {
window.style.backgroundColor = Math.random() * 4 > 1 ? color : 'black'
window.style.boxShadow = `1px 0 ${Math.random() * 4 > 1 ? color : 'black'}, 0 1px ${Math.random() * 4 > 1 ? color : 'black'}, 1px 1px ${Math.random() * 4 > 1 ? color : 'black'}`
}
window.style.margin = `${windowFrame}px`
floor.appendChild(window)
}
return floor
}
const newStar = () => {
const star = document.createElement('span')
star.classList.add('star')
star.style.backgroundColor = ['#666666', '#777777', '#888888', '#999999', '#aaaaaa', '#bbbbbb', '#cccccc', '#dddddd', '#eeeeee', '#ffffff'][Math.floor(Math.random() * 10)]
star.style.left = `${Math.floor(Math.random() * dimensions.sky.width)}px`
let guess = Math.floor(Math.random() * gauss(dimensions.sky.height)) + 1
let i = 0
while (guess > 0) {
guess -= ++i
}
star.style.top = `${dimensions.sky.height - i}px`
sky.appendChild(star)
setTimeout(() => sky.removeChild(star), Math.round(Math.random() * dimensions.sky.height * dimensions.sky.width) + 60000)
}
const reset = () => {
if (Array.isArray(buildings) && buildings.length > 0) {
buildings.forEach(building => city.removeChild(building))
highest = { height: 0 }
}
buildings = []
dimensions = { sky: sky.getBoundingClientRect() }
city.style.height = `${Math.round(Math.floor(Math.random() * (dimensions.sky.height / 3 - dimensions.sky.height / 5)) + dimensions.sky.height / 5)}px`
dimensions.city = city.getBoundingClientRect()
for (let i = 0; i < Math.round(dimensions.city.width / (Math.floor(Math.random() * 13) + 8)); i++) {
buildings.push(newBuilding())
}
const diameter = Math.floor(Math.random() * 4) + 5
dot.style.bottom = `${highest.height + diameter / 2}px`
dot.style.height = `${diameter}px`
dot.style.left = `${Math.round(highest.left + highest.width / 2 - diameter / 2)}px`
dot.style.width = `${diameter}px`
}
const switchDot = () => {
dot.classList.toggle('on')
}
const switchWindow = () => {
const windows = document.querySelectorAll('.window')
const windowsOn = document.querySelectorAll('.window.on')
let randomWindow = windows[Math.floor(Math.random() * windows.length)]
if (windowsOn.length / windows.length < 0.72) {
while (randomWindow.classList.contains('on')) {
randomWindow = windows[Math.floor(Math.random() * windows.length)]
}
} else {
while (!randomWindow.classList.contains('on')) {
randomWindow = windows[Math.floor(Math.random() * windows.length)]
}
}
randomWindow.classList.toggle('on')
}
reset()
window.addEventListener('resize', debounce(reset))
animate()
})