let radius = 100, // radius: blob 的基准半径
offset = .8, // offset: 根据基准半径的偏移程度
scale = 20, // scale: 形变的程度
speed = .02 // speed: 形变的速度

const width = window.innerWidth, height = window.innerHeight

function setup() {
    createCanvas(width, height)
}

function draw() {
    background(0)
    fill('#ff0000')
    noStroke()
    translate(width / 2, height / 2)
    beginShape()
        for (let i = 0; i < TWO_PI; i += radians(1)) {

            let xOff = offset * cos(i) + .2
            let yOff = offset * sin(i) + .2

            let r = radius + map(noise(xOff, yOff, speed), 0, 1, -scale, scale)

            let x = r * cos(i)
            let y = r * sin(i)

            vertex(x, y)
        }
    endShape()
    speed += .01
}