var speed;

var baseDiameter;

var pulseAmplitude;

​

function setup() {

  createCanvas(500, 500);

  // Initialize all values

  r = height * 0.45;  // the radius of the circle

  theta = 0;

  speed = .02; 

  baseDiameter = 32;

  pulseAmplitude = 16;

​

}

​

function draw() {

  background(244,132,140); 

  //background(0);

  // Translate the origin point to the center of the screen

  translate(width/2, height/2);

  // Convert polar to cartesian

  var x = r * cos(theta);

  var y = r * sin(theta);

  var diam = baseDiameter + sin(theta*4) * pulseAmplitude;

  // Draw the ellipse at the cartesian coordinate

  ellipseMode(CENTER);

  fill(255);

  ellipse(x, y, diam, diam);

  // Apply speed to theta

  theta += speed;

​

}