Created
November 24, 2023 22:53
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const canvas = document.querySelector('#canvas'); | |
const ctx = canvas.getContext('2d'); | |
let windowWidth = window.innerWidth; | |
let windowHeight = window.innerHeight; | |
const onResize = () => { | |
canvas.width = windowWidth = window.innerWidth; | |
canvas.height = windowHeight = window.innerHeight; | |
}; | |
window.addEventListener('resize', onResize); | |
onResize(); | |
let start = undefined; | |
let time = 0; | |
let isPlaying = true; | |
const tick = (timeStamp) => { | |
if (start === undefined) { | |
start = timeStamp; | |
} | |
if (time !== timeStamp) { | |
update(); | |
draw(); | |
} | |
time = timeStamp; | |
if (isPlaying) { | |
window.requestAnimationFrame(tick); | |
} | |
} | |
const randomBetween = (min, max) => (Math.random() * (max - min) + min); | |
const padding = 200; | |
const particlesBackground = []; | |
const particlesForground = []; | |
const setup = () => { | |
console.log('Setup'); | |
for (let i = 0; i < 1000; i++) { | |
particlesBackground.push({ | |
x: randomBetween(0, windowWidth), | |
y: randomBetween(0, windowHeight), | |
v: randomBetween(1, 10), | |
s: randomBetween(0.2, 2), | |
o: randomBetween(0.25, 0.9), | |
}); | |
} | |
for (let i = 0; i < 500; i++) { | |
particlesForground.push({ | |
x: randomBetween(padding, windowWidth - padding), | |
y: randomBetween(padding, windowHeight - padding), | |
v: randomBetween(1, 10), | |
s: randomBetween(0.2, 2), | |
o: randomBetween(0.25, 0.9), | |
}); | |
} | |
window.requestAnimationFrame(tick); | |
}; | |
const draw = () => { | |
ctx.rect(0, 0, ctx.canvas.width, ctx.canvas.height); | |
ctx.fillStyle = "black"; | |
ctx.fill() | |
for (particle of particlesBackground) { | |
ctx.beginPath(); | |
ctx.arc(particle.x, particle.y, particle.s, 0, 2 * Math.PI); | |
ctx.fillStyle = `rgba(255,255,255,${particle.o})`;; | |
ctx.fill(); | |
} | |
ctx.beginPath(); | |
ctx.rect( | |
padding, | |
padding, | |
windowWidth - (padding * 2), | |
windowHeight - (padding * 2) | |
); | |
ctx.fillStyle = `rgba(0,0,0,1)`; | |
ctx.fill(); | |
for (particle of particlesForground) { | |
ctx.beginPath(); | |
ctx.arc(particle.x, particle.y, particle.s, 0, 2 * Math.PI); | |
ctx.fillStyle = `rgba(255,255,255,${particle.o})`;; | |
ctx.fill(); | |
} | |
ctx.beginPath(); | |
ctx.moveTo(windowWidth / 2, windowHeight / 2 - 200); | |
ctx.lineTo(windowWidth / 2 + 200, windowHeight / 2 + 200); | |
ctx.lineTo(windowWidth / 2 - 200, windowHeight / 2 + 200); | |
ctx.closePath(); | |
ctx.fillStyle = "black"; | |
ctx.fill(); | |
}; | |
const update = () => { | |
for (particle of particlesBackground) { | |
particle.x -= particle.v * 0.1; | |
if (particle.x < 0) { | |
particle.x = windowWidth; | |
particle.y = randomBetween(0, windowHeight); | |
particle.v = randomBetween(1, 10); | |
} | |
} | |
for (particle of particlesForground) { | |
particle.x += particle.v * 0.1; | |
if (particle.x > windowWidth - padding) { | |
particle.x = randomBetween(padding, padding); | |
particle.y = randomBetween(padding, windowHeight - padding); | |
particle.v = randomBetween(1, 10); | |
} | |
} | |
}; | |
setup(); |
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