<?

#--- Access the PDF library, create new PDF document.
require('../../../../fpdf/fpdf.php');
$pdf = new FPDF();

#--- Print two pages.
foreach( range( 1, 2 ) as $page ){

  #--- Add a page.
  $pdf->AddPage();

  #--- Print 50 scrambles.  
  for( $s=0; $s<50; $s++ ){

    #--- Get the scramble and adjust the font size.
    $scramble = scramble();
    $pdf->SetFont( 'Courier' , '' , 750 / strlen($scramble) );

    #--- Define the cell border.
    $border = "";
    if( $s % 5 == 0 ) $border .= "T";
    if( $s % 5 == 4 ) $border .= "B";
    
    #--- Print the scramble.
    $pdf->Cell( 0, 5, $scramble, $border, 1, "R" );
  }
}

#--- Output the PDF document.
$pdf->Output( "scramble3x3.pdf", "I" );

#-------------------------------------------------------------------------
function scramble () {
#-------------------------------------------------------------------------

  $faces = array( 'U', 'D', 'L', 'R', 'F', 'B' );
  $dirs = array( "", "'", "2" );

  foreach( range( 1, 25 ) as $t ){

    #--- Find face to turn.
    do {
      $turn = rand( 0, 5 );
    } while( $bad[$turn] == 1 );

    #--- Add the turn.
    $out .= $faces[$turn] . $dirs[rand(0,2)] . ' ';

    #--- Mark the face as unavailable.
    $bad[$turn] = 1;

    #--- Mark all adjacent faces as available.
    foreach( range( 0, 5 ) as $i )
      if( $i != $turn  &&  ($i^1) != $turn )
        $bad[$i] = 0;
  }
  return trim( $out );
}

?>