partical.js

function Partical(x, y, hu, isFirework) {
    this.pos = createVector(x, y);
    this.lifespan = 255;
    this.hu = hu

    this.isFirework = isFirework
    if (this.isFirework) {
        this.vel = createVector(0, random(-12, -8));
    } else {
        this.vel = p5.Vector.random2D()
        this.vel.mult(random(1,10))
    }
    this.acc = createVector(0, 0);

    this.applyForce = function(force) {
        this.acc.add(force)
    }

    this.update = function() {
        if (!this.isFirework) {
            this.vel.mult(0.87)
            this.lifespan -= 4
        }
        this.vel.add(this.acc)
        this.pos.add(this.vel)
        this.acc.mult(0)
    }

    this.done = function () {
        if (this.lifespan < 0) {
            return true
        } else {
            return false
        }
    }

    this.show = function() {
        colorMode(HSB)
        if (!this.isFirework) {
            strokeWeight(2)
            stroke(hu, 255, 255, this.lifespan)
        } else {
            strokeWeight(4)
            stroke(hu, 255, 255)
        }
        point(this.pos.x, this.pos.y)
    }

    this.isOffbound = function () {
        return this.pos.x < -1
    }
}