<?php
/*
Barcode Render Class for PHP using the GD graphics library 
Copyright (C) 2001  Karim Mribti
								
   Version  0.0.7a  2001-04-01  
								
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
																  
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
											   
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
																		 
Copy of GNU Lesser General Public License at: http://www.gnu.org/copyleft/lesser.txt

Source code home page: http://www.mribti.com/barcode/
Contact author at: barcode@mribti.com
*/
  
  /* 
    Render for Code 39    
  	Code 39 is an alphanumeric bar code that can encode decimal number, case alphabet and some special symbols.
  */
    
    
  class C39Object extends BarcodeObject {
   var $mCharSet, $mChars;
   function __construct($Width, $Height, $Style, $Value)
   {
     parent::__construct($Width, $Height, $Style);
	 $this->mValue   = $Value;
	 $this->mChars   = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. *$/+%";
	 $this->mCharSet = array
	  (
  		/* 0  */ "000110100",
  		/* 1  */ "100100001",
        /* 2  */ "001100001",
  	    /* 3  */ "101100000",
  		/* 4  */ "000110001",
		/* 5  */ "100110000",
  		/* 6  */ "001110000",
	    /* 7  */ "000100101",
		/* 8  */ "100100100",
		/* 9  */ "001100100",
		/* A  */ "100001001",
	    /* B  */ "001001001",
	    /* C  */ "101001000",
		/* D  */ "000011001",
  		/* E  */ "100011000",
		/* F  */ "001011000",
	    /* G  */ "000001101",
		/* H  */ "100001100",
  		/* I  */ "001001100",
	    /* J  */ "000011100",
  		/* K  */ "100000011",
  		/* L  */ "001000011",
  		/* M  */ "101000010",
  		/* N  */ "000010011",
  		/* O  */ "100010010",
  		/* P  */ "001010010",
  		/* Q  */ "000000111",
  		/* R  */ "100000110",
  		/* S  */ "001000110",
  		/* T  */ "000010110",
  		/* U  */ "110000001",
  		/* V  */ "011000001",
  		/* W  */ "111000000",
  		/* X  */ "010010001",
  		/* Y  */ "110010000",
  		/* Z  */ "011010000",
  		/* -  */ "010000101",
  		/* .  */ "110000100",
  		/* SP */ "011000100",
  		/* *  */ "010010100",
 		/* $  */ "010101000",
  		/* /  */ "010100010",
  		/* +  */ "010001010",
  		/* %  */ "000101010" 
	);
   }
   
   function GetCharIndex ($char)
   {
    for ($i=0;$i<44;$i++) {
	  if (substr($this->mChars, $i, 1) == $char)
	     return $i;
	 }
	 return -1;
   }
    
   function GetSize($xres)
   {
     $len = strlen($this->mValue);
	 
	 if ($len == 0)  {
	   $this->mError = "Null value";
	   return false;
	   }
	 
	 for ($i=0;$i<$len;$i++) {
	  if ($this->GetCharIndex($this->mValue[$i]) == -1 || $this->mValue[$i] == '*') {
	  		/* The asterisk is only used as a start and stop code */
	        $this->mError = "C39 not include the char '".$this->mValue[$i]."'";
			return false;
		 }
	 }
	 
	 /* Start, Stop is 010010100 == '*'  */
	 $StartSize = BCD_C39_NARROW_BAR * $xres * 6 + BCD_C39_WIDE_BAR * $xres * 3;
 	 $StopSize  = BCD_C39_NARROW_BAR * $xres * 6 + BCD_C39_WIDE_BAR * $xres * 3;
	 $CharSize  = BCD_C39_NARROW_BAR * $xres * 6 + BCD_C39_WIDE_BAR * $xres * 3; /* Same for all chars */
	  
	  return $CharSize * $len + $StartSize + $StopSize + /* Space between chars */ BCD_C39_NARROW_BAR * $xres * ($len+1);
   }

   function DrawStart($DrawPos, $yPos, $ySize, $xres)
   {  /* Start code is '*' */
      $narrow = BCD_C39_NARROW_BAR * $xres;
	  $wide   = BCD_C39_WIDE_BAR * $xres;
	  $this->DrawSingleBar($DrawPos, $yPos, $narrow , $ySize);
	  $DrawPos += $narrow;
	  $DrawPos += $wide;
	  $this->DrawSingleBar($DrawPos, $yPos, $narrow , $ySize);
	  $DrawPos += $narrow;
  	  $DrawPos += $narrow;
	  $this->DrawSingleBar($DrawPos, $yPos, $wide , $ySize);
	  $DrawPos += $wide;
	  $DrawPos += $narrow;
	  $this->DrawSingleBar($DrawPos, $yPos, $wide , $ySize);
	  $DrawPos += $wide;
  	  $DrawPos += $narrow;
	  $this->DrawSingleBar($DrawPos, $yPos, $narrow, $ySize);
	  $DrawPos += $narrow;
	  $DrawPos += $narrow; /* Space between chars */
	  return $DrawPos;
   }

   function DrawStop($DrawPos, $yPos, $ySize, $xres)
   {  /* Stop code is '*' */
      $narrow = BCD_C39_NARROW_BAR * $xres;
	  $wide   = BCD_C39_WIDE_BAR * $xres;
	  $this->DrawSingleBar($DrawPos, $yPos, $narrow , $ySize);
	  $DrawPos += $narrow;
	  $DrawPos += $wide;
	  $this->DrawSingleBar($DrawPos, $yPos, $narrow , $ySize);
	  $DrawPos += $narrow;
  	  $DrawPos += $narrow;
	  $this->DrawSingleBar($DrawPos, $yPos, $wide , $ySize);
	  $DrawPos += $wide;
	  $DrawPos += $narrow;
	  $this->DrawSingleBar($DrawPos, $yPos, $wide , $ySize);
	  $DrawPos += $wide;
  	  $DrawPos += $narrow;
	  $this->DrawSingleBar($DrawPos, $yPos, $narrow, $ySize);
	  $DrawPos += $narrow;
	  return $DrawPos;
   }

   function DrawObject ($xres)
   {
     $len = strlen($this->mValue);

	 $narrow = BCD_C39_NARROW_BAR * $xres;
	 $wide   = BCD_C39_WIDE_BAR * $xres;

	 if (($size = $this->GetSize($xres))==0) {
	    return false;
	 }

	 $cPos = 0;
	 if ($this->mStyle & BCS_ALIGN_CENTER) $sPos = (integer)(($this->mWidth - $size ) / 2);
	 else if ($this->mStyle & BCS_ALIGN_RIGHT) $sPos = $this->mWidth - $size;
	 	  else $sPos = 0;

	 /* Total height of bar code -Bars only- */
	 if ($this->mStyle & BCS_DRAW_TEXT) $ysize = $this->mHeight - BCD_DEFAULT_MAR_Y1 - BCD_DEFAULT_MAR_Y2 - $this->GetFontHeight($this->mFont);
	 else $ysize = $this->mHeight - BCD_DEFAULT_MAR_Y1 - BCD_DEFAULT_MAR_Y2;

	 /* Draw text */
	 if ($this->mStyle & BCS_DRAW_TEXT) {
	   	 if ($this->mStyle & BCS_STRETCH_TEXT) {
			for ($i=0;$i<$len;$i++) {
	   	  	  	$this->DrawChar($this->mFont, $sPos+($size/($len+2))*($i+1.5) - $this->GetFontWidth($this->mFont)/2,
			  			 $ysize + BCD_DEFAULT_MAR_Y1 + BCD_DEFAULT_TEXT_OFFSET, $this->mValue[$i]);
				}
		 } else {/* Center */
		  	 $text_width = $this->GetFontWidth($this->mFont) * strlen($this->mValue);
			 $this->DrawText($this->mFont, $sPos+(($size-$text_width)/2),
			 				  $ysize + BCD_DEFAULT_MAR_Y1 + BCD_DEFAULT_TEXT_OFFSET, $this->mValue);
	      }
	  }

	 $DrawPos = $this->DrawStart($sPos, BCD_DEFAULT_MAR_Y1 , $ysize, $xres);
	 do {
		$c     = $this->GetCharIndex($this->mValue[$cPos]);
		$cset  = $this->mCharSet[$c];       		
	    $this->DrawSingleBar($DrawPos, BCD_DEFAULT_MAR_Y1, ($cset[0] == '0') ? $narrow : $wide , $ysize);
	    $DrawPos += ($cset[0] == '0') ? $narrow : $wide;
	    $DrawPos += ($cset[1] == '0') ? $narrow : $wide;
	    $this->DrawSingleBar($DrawPos, BCD_DEFAULT_MAR_Y1, ($cset[2] == '0') ? $narrow : $wide , $ysize);
	    $DrawPos += ($cset[2] == '0') ? $narrow : $wide;
	    $DrawPos += ($cset[3] == '0') ? $narrow : $wide;
	    $this->DrawSingleBar($DrawPos, BCD_DEFAULT_MAR_Y1, ($cset[4] == '0') ? $narrow : $wide , $ysize);
	    $DrawPos += ($cset[4] == '0') ? $narrow : $wide;
	    $DrawPos += ($cset[5] == '0') ? $narrow : $wide;
	    $this->DrawSingleBar($DrawPos, BCD_DEFAULT_MAR_Y1, ($cset[6] == '0') ? $narrow : $wide , $ysize);
	    $DrawPos += ($cset[6] == '0') ? $narrow : $wide;
	    $DrawPos += ($cset[7] == '0') ? $narrow : $wide;
	    $this->DrawSingleBar($DrawPos, BCD_DEFAULT_MAR_Y1, ($cset[8] == '0') ? $narrow : $wide , $ysize);
	    $DrawPos += ($cset[8] == '0') ? $narrow : $wide;
	    $DrawPos += $narrow; /* Space between chars */
		$cPos++; 
	  } while ($cPos<$len);
	  $DrawPos =  $this->DrawStop($DrawPos, BCD_DEFAULT_MAR_Y1 , $ysize, $xres);
	  return true;
	 }
  }
?>