https://math.stackexchange.com/questions/814950/how-can-i-rotate-a-coordinate-around-a-circle

https://fr.wikipedia.org/wiki/Rotation_plane

class Circle{
	constructor(centerX, centerY, rotationRadius, circleRadius) {
		this.rotationRadius = rotationRadius;
		this.r = circleRadius;
		this.center = new p5.Vector(centerX, centerY);
		this.pos = new p5.Vector(centerX, centerY + rotationRadius);
	}
	rotate(angleDegrees) {
		let angleRadians = angleDegrees * PI / 180;
		// this.pos.rotate(HALF_PI / 10);
		// x' = cos(θ)*(x−cx)−sin(θ)*(y−cy)+cx
		// y' = sin(θ)*(x−cx)+cos(θ)*(y−cy)+cy

		// this.pos.x = (this.pos.x - this.center.x) * cos(angleRadians) + (this.pos.y * sin(angleRadians);
		this.pos.x = (this.pos.x - this.center.x) * cos(angleRadians) - (this.pos.y - this.center.y) * sin(angleRadians) + this.center.x;
		// this.pos.y = -1 * this.pos.x * sin(angleRadians) + this.pos.y * cos(angleRadians);
		this.pos.y = (this.pos.x - this.center.x) * sin(angleRadians) + (this.pos.y - this.center.y) * cos(angleRadians) + this.center.y;

	}
	show() {
		fill(255);
		// console.log(this.pos.x, this.pos.y, this.r * 2);
		ellipse(this.pos.x, this.pos.y, this.r * 2);
		// ellipse(100, 150, 20);
	}
}

var cir;
function setup() {
	createCanvas(600,600);
	cir = new Circle(100, 100, 50, 10);
	// frameRate(2);
}

function draw() {
	// translate(width / 2, height / 2);
	background(0);
	cir.rotate(10);
	cir.show();
}