​

function setup() { 

  createCanvas(windowWidth, windowHeight);

  circX=width;

  circY=height/2;

} 

​

function draw() { 

  background(0);

  let speed = dist(circX,circY,width/2,height/2);

  ellipse(circX,circY, 50,50);

  ellipse(circX+50,circY,50,50);

  ellipse(circX+100,circY,50,50);

  ellipse(circX+150,circY,50,50);

  circX-= speed/20;

  if (circX<0){

    circX= windowWidth;

  }

​

}