function setup() {
    createCanvas(500, 500)
    angleMode(DEGREES)
}

function draw() {
    background(20)
    stroke(255)
    strokeWeight(5)
    noFill()

    translate(width / 2, height / 2)

    beginShape()
    for (var i = 0; i < 359; i++) {

        var r1Min = map(sin(frameCount), -1, 1, 50, 120)
        var r1Max = map(sin(frameCount * 2), -1, 1, 100, 20)

        var r2Min = map(sin(frameCount / 2), -1, 1, 120, 50)
        var r2Max = map(sin(frameCount), -1, 1, 20, 100)

        var r1 = map(sin(i * 3), -1, 1, r1Min, r1Max)
        var r2 = map(sin(i * 6 + 90), -1, 1, r2Min, r2Max)
        var r = r1 + r2
        var x = r * cos(i)
        var y = r * sin(i)
        vertex(x, y)
    }
    endShape(CLOSE)
}