ArrayList circles = new ArrayList();
int _amount = 10;
int _index = 0;
CircleMath calcCirc;

void setup()
{
  size( 512, 512 );
  frameRate(40);
  background(0x222222);
  calcCirc = new CircleMath();
  for( int i = 0; i < _amount ; i++ )
  {
    Circle c = new Circle(new PVector( random( 0, width), random( 0, height )), random( 15, 100 ) );
    circles.add( c ); 
    c.update( true );
  } 
}

void draw()
{
  _index = 1;
  while( _index < _amount )
  {
    Circle c0 = (Circle)circles.get( _index - 1 );
    c0.update( true );
    for( int i = _index; i < _amount; i++ )
    {
      //println( _index + " " + i );
      Circle c1 = (Circle)circles.get( i );
      if( calcCirc.intersection( c0, c1 ))
      {
        drawIntersection( calcCirc.getFirstIntersection(), calcCirc.getSecondIntersection() );
      }        
    }
    _index++;
  }
  //filter( BLUR );
  //noLoop();
}

void drawIntersection(PVector p0, PVector p1 )
{
  ellipseMode( CENTER );
  smooth();
  noFill();
  //stroke( 0x44009900 );
  stroke( 0x77FFFFFF);
  ellipse( p0.x, p0.y, 0.1, 0.1 );
  ellipse( p1.x, p1.y, 0.1, 0.1 );
}