​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

    //var cmouseX = constrain(mouseX,0,400); //constrains mouseX to canvas

  fill(255);

  ellipseMode(CENTER);

  translate(width/2, height/2);

  angleMode(DEGREES);

  rotate(angle);

  ellipse(0, 10, 50, 50);

  //angle = ((mouseX - 100) / 2);

  angle = mouseX

}