ArrayList circles = new ArrayList();
float start = 130;
void setup()
{
  size( 512, 512 );
  frameRate(10);
  background(0x222222);
  circles.add( new Circle(new PVector( random( 0, width), random( 0, height )), random( 10, 100 ) ));
}

void draw()
{
  Circle cNew = new Circle(new PVector( random( 0, width), random( 0, height )), random( 1, start ) );
  int positive = 0;
  for( int i = 0; i < circles.size(); i++ )
  {
    Circle cOld = (Circle)circles.get( i );
    float delta = cNew.getCenter().dist( cOld.getCenter() );
    float radiSum = cNew.getRadius() + cOld.getRadius();
    if( delta >= radiSum  )
    {
      positive++;
    }
  }
  if( positive == circles.size())
  {
    start = random( 5, 130 );
    circles.add( cNew );
    cNew.drawMe( start );
    //start *= 0.99;
  }
}