ziyun

float x = 500;
float y = 500;
float speedX = 2;
float speedY = 0.5f;
float circleSize = 5;

public void setup(){

   background(0xff80D7EA);
}

public void draw(){
  // Behavior

  fill(random(255), random(255), random(253, 150),75);
  stroke(random(255));
  x = x+speedX;
  y = y+speedY;
  circleSize = random(10, 45)/10;

  // Drawing the ellipse
  ellipse(x, y, 35, 35);

  //Reset the position
  x += speedX;
  if(x > width || x < 0){
    speedX *= -1;
  }

  y += speedY;
  if(y > height || y < 0){
    speedY *= -1;
  }
}
  public void settings() {  size(500, 500); }