fogos-de-artificio/fireworks.js at main · yurylucas/fogos-de-artificio · GitHub

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const canvas = document.getElementById("canvas")
const canvasContext = canvas.getContext("2d")


let gravity = -0.1

let fireworks = []
let subFireworks = []


class Firework {
    constructor(x,y, radius, velocityX, velocityY, color)
    {
        this.x = x
        this.y = y
        this.radius = radius
        this.velocityX = velocityX
        this.velocityY = velocityY
        this.color = color
        this.opacity = 1

    }

    update()
    {
        this.velocityY -= gravity
        this.x += this.velocityX
        this.y += this.velocityY
        this.opacity -= 0.006
        if(this.opactiy < 0) this.opacity = 0

    }

    draw()
    {
        canvasContext.save()
        canvasContext.globalAlpha = this.opacity
        canvasContext.beginPath()
        canvasContext.arc(this.x, this.y, this.radius, 0, 2 * Math.PI, false)
        canvasContext.fillStyle = this.color
        canvasContext.fill()
        canvasContext.closePath()
        canvasContext.restore()


    }

}


let animate = () => {
    requestAnimationFrame(animate)
    update()
    draw()
}

let colors = ["Blue", "Orange", "Red", "Purple", "Green"]
let initializeCount = 0
let maximumInitialize = 1

let initDelay = 500// ms
let fireworkRadius = 5
let particleCount = 120
let speedMultiplier = 5

let createSubFireworks = (x,y,count,color, speedMultiplier) => {
    let created = 0
    let radians = (Math.PI * 2) / count

    while(created < count )
    {
        let firework = new Firework(x,y,fireworkRadius,
                    Math.cos(radians * created) * Math.random() * speedMultiplier,
                    Math.sin(radians * created) * Math.random() * speedMultiplier, colors[Math.floor(Math.random() * colors.length)])

        subFireworks.push(firework)
        console.log(subFireworks)
        created++
    }

}
let update = () => {
    canvasContext.fillStyle = "rgba(10,0,0,0.1)" // this will give tail effect
    canvasContext.fillRect(0,0,canvas.width, canvas.height)
    if(initializeCount < maximumInitialize)
    {
        let firework = new Firework(Math.random() * canvas.width,
                                    canvas.height + Math.random() * 70
                                    , fireworkRadius,
                                    3 * (Math.random() - 0.5), -12,
                                colors[Math.floor(Math.random() * colors.length)])
        fireworks.push(firework)
        console.log(fireworks)
        setTimeout(()=>{
            initializeCount --
        }, initDelay)
        initializeCount ++
    }
    fireworks.forEach((firework,i)=>{
        if(firework.opacity <= 0.1)
        {
            fireworks.splice(i,1)
            createSubFireworks(firework.x, firework.y, particleCount,
            firework.color, speedMultiplier)
        }
        else {
            firework.update()
        }
    })
    subFireworks.forEach((firework,i)=>{
        if(firework.opacity <= 0)
        {
            subFireworks.splice(i,1)
        }
        else {
            firework.update()
        }
    })
}


let draw = () => {
    fireworks.forEach(firework=> {
        firework.draw()
    })
    subFireworks.forEach(firework=>{
        firework.draw()
    })
}


animate()