int x = int(random(width));

int y = int(random(height));

int xspeed = 2;

int yspeed = 1;

int size = 50;

void setup(){

  size(640, 480);

}

void draw(){

  println(frameCount);

  background(0);

  move();

  display();

}

void display(){

  fill(random(255), random(255), random(255));     // random(5);

  if(frameCount % 60 < 30){

    arc(x, y, size, size, 0.5, 5.78);

  } else {

    arc(x, y, size, size, 0.1, 6.18);    

  } 

}

void move(){

  x = x + xspeed; 

  y = y + yspeed;

  if(x < 0 || x > 640){

    xspeed= -xspeed;   

  }

  if(y < 0 || y > 480){

    yspeed = -yspeed;   

  }

}

void mousePressed(){

  x = int(random(width));

  y = int(random(height));

  xspeed = int(random(10));

  yspeed = int(random(10));

  size = 50;

}