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script.js
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script.js
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const canvas = document.getElementById("canvas1")
const ctx = canvas.getContext("2d")
console.log(ctx)
function get_random(list) {
return list[Math.floor((Math.random()*list.length))];
}
canvas.width = window.innerWidth
canvas.height = window.innerHeight
//canvas settings
ctx.fillStyle = 'white'
ctx.lineWidth = 1
class Particle {
constructor(effect){
this.effect = effect
this.x = Math.floor(Math.random() * this.effect.width)
this.y = Math.floor(Math.random() * this.effect.height)
this.speedX
this.speedY
this.speedModifier = Math.floor(Math.random() * 3 + 1)
this.history = [{x: this.x, y: this.y}]
this.maxLength = Math.floor(Math.random() * 300 + 10)
this.angle
this.timer = this.maxLength * 2
}
draw(context){
context.beginPath()
context.moveTo(this.history[0].x, this.history[0].y)
for(let i = 0; i < this.history.length; i++){
context.lineTo(this.history[i].x, this.history[i].y)
}
context.stroke()
}
update(){
this.timer--
if(this.timer >= 1){
let x = Math.floor(this.x / this.effect.cellSize)
let y = Math.floor(this.y / this.effect.cellSize)
let index = y * this.effect.cols + x
this.angle = this.effect.flowField[index]
this.speedX = (Math.cos(this.angle) * this.speedModifier)
this.speedY = (Math.sin(this.angle) * this.speedModifier)
this.x += this.speedX
this.y += this.speedY
this.history.push({x: this.x, y: this.y})
if(this.history.length > this.maxLength){
this.history.shift()
}
} else if(this.history.length > 1){
this.history.shift()
} else {
this.reset()
}
}
reset(){
this.x = Math.floor(Math.random() * this.effect.width)
this.y = Math.floor(Math.random() * this.effect.height)
this.history = [{x: this.x, y: this.y}]
this.timer = this.maxLength * 2
}
}
class Effect {
constructor(width, height){
this.width = width
this.height = height
this.particle = []
this.numberOfParticle = 10000
this.cellSize = 30
this.rows
this.cols
this.flowField = []
this.curve = 2.3
this.zoom = 0.23
this.color = ["blue", "red", "purple", "green", "yellow", "pink", "white"]
this.init()
}
init(){
//create flow field
this.rows = Math.floor(this.height / this.cellSize)
this.cols = Math.floor(this.width / this.cellSize)
for(let x = 0; x < this.rows; x++){
for(let y = 0; y < this.cols; y++){
let angle = ((Math.cos(x * this.zoom)) + (Math.sin(y * this.zoom))) * this.curve
this.flowField.push(angle)
}
}
//create particles
for(let i = 1; i < this.numberOfParticle; i++){
this.particle.push(new Particle(this))
}
}
drawGrid(context){
context.strokeStyle = 'white'
for(let i = 0; i < this.cols; i++){
context.beginPath()
context.moveTo(this.cellSize * i, 0)
context.lineTo(this.cellSize * i, this.height)
context.stroke()
}
for(let i = 0; i < this.rows; i++){
context.beginPath()
context.moveTo(0,this.cellSize * i)
context.lineTo(this.width, this.cellSize * i)
context.stroke()
}
}
render(context){
//this.drawGrid(context)
this.particle.forEach(particle => {
context.strokeStyle = get_random(this.color)
particle.draw(context)
particle.update()
})
}
}
function animate(){
ctx.clearRect(0, 0, canvas.width, canvas.height)
effect.render(ctx)
requestAnimationFrame(animate)
}
const effect = new Effect(canvas.width, canvas.height)
animate()