private static boolean blueVisible ( double x , double y , double x1 , double y1 , double r ) {
  double dx = x - x1 ;
  double dy = y - y1 ;
  return dx * dx + dy * dy > r * r ;
}

private static boolean blueVisible ( double x , double y , double x1 , double y1 , double r ) { double dx = x - x1 ; double dy = y - y1 ; return dx * dx + dy * dy > r * r ; }
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