CubicInOut.pde

float toff = 0;

void setup(){
  fullScreen();
  //size(1000, 500);
  strokeWeight(5);
  background(255);
}

void draw(){
  fill(255, 50);
  rect(0, 0, width, height);
  //background(255);
  noStroke();
  fill(0);
  for(int i = 0; i < width; i+=200){
    float t = map(i, 0, width, 0, 1);
    ellipse(i, EaseInOutCubic(height-height/4, height/4, abs((t+toff)%2-1)), 60, 60);
  }
  toff += 0.01;
}

float EaseInOutCubic(float start, float end, float t){
  end -= start;//calculate difference
  return t<0.5 ? end*4*t*t*t+start : end*(4*(t-1)*(t-1)*(t-1)+1)+start;
}