let circle1;

​

function setup()

{

  createCanvas(400, 400);

  circle1 = new Circle(0, 200, 50);

}

​

function Circle(x, y, diameter)

{

  this.x = x;

  this.y = y;

  this.diameter = diameter;

  this.increaseX = function()

  {

    this.x = this.x + 1;

  }

}

​

function draw()

{

  background(255);

​

  noStroke();

  fill(circleColor, circleColor + 100, circleColor + 200);

  ellipse(circle1.x, circle1.y, circle1.diameter, circle1.diameter);

  circle1.increaseX();

  circleColor = (circleColor + 5) % 256;

}

​

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