<?php
/*
piece.php
https://triskaideka.net/graf/
License: MIT ( https://opensource.org/licenses/MIT )
Version history:
   2009 Feb: Initial version
   2015 Apr: Changed license from GNU GPL to MIT; corrected minimum value of distance to match what the page actually said;
             added is_numeric() check for distance and stagger parameters
*/

#internal settings
$settings = parse_ini_file("graf.ini", true);  # "true" gets us a multidimensional array
$styledir = "./styles/";
$ext = ".";
$height = 0;  # will be raised later by examining the height of each character in use


#settings from the INI file based on user's style selection
if (isset($settings[$_POST['style']]))  {
  $settings = $settings[$_POST['style']];  #now $settings is a one-dimensional array containing the settings we're using
  if (isset($settings['dir']))  { $styledir .= preg_replace("/[\.\\\]/", "", $settings['dir']) . "/" ; }
  $ext .= (isset($settings['ext'])) ? $settings['ext'] : "png";
  $replacement = (isset($settings['replacement']) && file_exists($styledir . ord($settings['replacement']) . $ext)) ? ord($settings['replacement']) : 32;  # $styledir$replacement$ext must exist.  32 = Space.
}
if (!file_exists("$styledir$replacement$ext"))  { die("Error: can't even find the replacement character"); }


#settings that could come from user
$direction = (isset($_POST['direction']) && $_POST['direction'] == "right") ? "right" : "left";
$distance = (isset($_POST['distance']) && is_numeric($_POST['distance']) && $_POST['distance'] >= -20 && $_POST['distance'] <= 40) ? $_POST['distance'] : 15;
$stagger = (isset($_POST['stagger']) && is_numeric($_POST['stagger']) && $_POST['stagger'] >= 0 && $_POST['stagger'] <= 20) ? $_POST['stagger'] : 0;


#separate into individual letters
$msg = preg_split('//', $_POST['text'], 30, PREG_SPLIT_NO_EMPTY);
foreach ($msg as &$m)  {
  $m = ord($m);
  if (!file_exists("$styledir$m$ext"))  { $m = $replacement; }
  $ary = getimagesize("$styledir$m$ext");
  if ($height < ($ary[1] + ($stagger * 2)))  { $height = $ary[1] + ($stagger * 2); }
}
if ($direction == "left")  { $msg = array_reverse($msg); }


#build the piece
$wall = imagecreatetruecolor($distance, $height);

foreach ($msg as $letter)  {
  $next = imagecreatefrompng("$styledir$letter$ext");

  $width = imagesx($wall) + imagesx($next) - $distance;

  $temp = imagecreatetruecolor($width, $height);

  if ($direction == "right")  {
    imagecopy( $temp , $wall , 0, ($height-imagesy($wall))/2 , 0 , 0 , imagesx($wall) , imagesy($wall) );
    imagecopy( $temp , $next , imagesx($temp)-imagesx($next) , (intval(($height-imagesy($next))/2) + mt_rand(-$stagger, $stagger)) , 0 , 0 , imagesx($next) , imagesy($next) );
  }
  else  {   #($direction == "left")
    imagecopy( $temp , $wall , imagesx($next)-$distance, ($height-imagesy($wall))/2 , 0 , 0 , imagesx($wall) , imagesy($wall) );
    imagecopy( $temp , $next , 0 , (intval(($height-imagesy($next))/2) + mt_rand(-$stagger, $stagger)) , 0 , 0 , imagesx($next) , imagesy($next) );
  }

  $wall = imagecreatetruecolor($width, $height);  # re-creating it so it will have the new size
  imagecolortransparent($wall, imagecolorallocate( $wall , 0 , 0 , 0 ));
  imagecopy( $wall , $temp , 0 , 0 , 0 , 0 , imagesx($temp) , imagesy($temp) );
}
imagedestroy($next);
imagedestroy($temp);


# change colors, if the user wants to
if (isset($_POST['setcolors']) && $_POST['setcolors'] == true)  {
  imagetruecolortopalette($wall, true, 255);

  $primary_red =   (isset($_POST['pred']))   ? $_POST['pred']   : 0;
  $primary_green = (isset($_POST['pgreen'])) ? $_POST['pgreen'] : 0;
  $primary_blue =  (isset($_POST['pblue']))  ? $_POST['pblue']  : 0;

  $secondary_red =   (isset($_POST['sred']))   ? $_POST['sred']   : 0;
  $secondary_green = (isset($_POST['sgreen'])) ? $_POST['sgreen'] : 0;
  $secondary_blue =  (isset($_POST['sblue']))  ? $_POST['sblue']  : 0;

  imagecolorset($wall, 0, $primary_red, $primary_green, $primary_blue);
  imagecolorset($wall, 1, $secondary_red, $secondary_green, $secondary_blue);
}


# output
if (isset($_POST['format']) && $_POST['format'] == "gif")  {
  header('Content-type: image/gif');
  imagegif($wall);
}  else  {
  header('Content-type: image/png');
  imagepng($wall, NULL, 9);
}

imagedestroy($wall);
?>