// Daniel Shiffman

// http://natureofcode.com

​

let angle = 0;

let avel = 0;

let aacc = 0;

​

function setup() {

  createCanvas(640, 360);

}

​

// function mousePressed() {

//   aacc = 0.1; 

// }

​

function draw() {

  aacc = map(mouseX, 0, width, -0.01, 0.01);

​

  angle += avel;

  avel = constrain(avel, -0.1,0.1);

  avel += aacc;

  aacc = 0;

​

  background(255);

​

  translate(width / 2, height / 2);

  rotate(angle);

​

  stroke(0);

  strokeWeight(2);

  fill(127);

​

  line(-60, 0, 60, 0);

  ellipse(60, 0, 16, 16);

  ellipse(-60, 0, 16, 16);

}