/**
A rotating NeonBox by 
<a href="http://www.local-guru.net/blog">Guru</a>
*/
int rot = 0;

void setup() {
  size(300,300);
  frameRate( 25 );
  smooth();
}

void draw() {
  rot++;
  if ( rot == 360 * 30 ) {
    rot = 0;
  }
  stroke(0);
  fill( 0, 0, 0, 80 );  
  rect( 0, 0, 300, 300 );

  translate( 150, 150 );
  rotate( rot * ( 4 * PI ) / 360 );
  
 // fill( 255 * abs( sin( 45 + float(rot) / 10 ))  , 255 * abs( sin( float(rot) / 10 )), 255 * abs( sin( 90 + float(rot) / 10 )));
  strokeWeight( 3 );
  stroke( 255 * abs( sin( 45 + float(rot) / 10 ))  , 255 * abs( sin( float(rot) / 10 )), 255 * abs( sin( 90 + float(rot) / 10 )));
  rect( -75, -75, 150, 150 );
}