class.pdf.php

国外很不错的一个开源OA系统Group-Office

<?php
  /**
   * Cpdf
   *
   * http://www.ros.co.nz/pdf
   *
   * A PHP class to provide the basic functionality to create a pdf document without
   * any requirement for additional modules.
   *
   * Note that they companion class CezPdf can be used to extend this class and dramatically
   * simplify the creation of documents.
   *
   * IMPORTANT NOTE
   * there is no warranty, implied or otherwise with this software.
   *
   * LICENCE
   * This code has been placed in the Public Domain for all to enjoy.
   *
   * @author       Wayne Munro <[e-mail]>
   * @version  009
   * @package  Cpdf
   */
class  Cpdf {


  /**
   * the current number of pdf objects in the document
   */
  public  $numObj = 0;

  /**
   * this array contains all of the pdf objects, ready for final assembly
   */
  public  $objects =  array();

  /**
   * the objectId (number within the objects array) of the document catalog
   */
  public  $catalogId;

  /**
   * array carrying information about the fonts that the system currently knows about
   * used to ensure that a font is not loaded twice, among other things
   */
  public  $fonts = array();

  /**
   * a record of the current font
   */
  public  $currentFont = '';

  /**
   * the current base font
   */
  public  $currentBaseFont = '';

  /**
   * the number of the current font within the font array
   */
  public  $currentFontNum = 0;

  /**
   *
   */
  public  $currentNode;

  /**
   * object number of the current page
   */
  public  $currentPage;

  /**
   * object number of the currently active contents block
   */
  public  $currentContents;

  /**
   * number of fonts within the system
   */
  public  $numFonts = 0;

  /**
   * Number of graphic state resources used
   */
  private  $numStates =  0;


  /**
   * current colour for fill operations, defaults to inactive value, all three components should be between 0 and 1 inclusive when active
   */
  public  $currentColour = array('r'=>-1, 'g'=>-1, 'b'=>-1);

  /**
   * current colour for stroke operations (lines etc.)
   */
  public  $currentStrokeColour = array('r'=>-1, 'g'=>-1, 'b'=>-1);

  /**
   * current style that lines are drawn in
   */
  public  $currentLineStyle = '';

  /**
   * current line transparency (partial graphics state)
   */
  public $currentLineTransparency = array("mode" => "Normal", "opacity" => 1.0);
  
  /**
   * current fill transparency (partial graphics state)
   */
  public $currentFillTransparency = array("mode" => "Normal", "opacity" => 1.0);
  
  /**
   * an array which is used to save the state of the document, mainly the colours and styles
   * it is used to temporarily change to another state, the change back to what it was before
   */
  public  $stateStack =  array();

  /**
   * number of elements within the state stack
   */
  public  $nStateStack =  0;

  /**
   * number of page objects within the document
   */
  public  $numPages = 0;

  /**
   * object Id storage stack
   */
  public  $stack = array();

  /**
   * number of elements within the object Id storage stack
   */
  public  $nStack = 0;

  /**
   * an array which contains information about the objects which are not firmly attached to pages
   * these have been added with the addObject function
   */
  public  $looseObjects = array();

  /**
   * array contains infomation about how the loose objects are to be added to the document
   */
  public  $addLooseObjects = array();

  /**
   * the objectId of the information object for the document
   * this contains authorship, title etc.
   */
  public  $infoObject = 0;

  /**
   * number of images being tracked within the document
   */
  public  $numImages = 0;

  /**
   * an array containing options about the document
   * it defaults to turning on the compression of the objects
   */
  public  $options = array('compression'=>1);

  /**
   * the objectId of the first page of the document
   */
  public  $firstPageId;

  /**
   * used to track the last used value of the inter-word spacing, this is so that it is known
   * when the spacing is changed.
   */
  public  $wordSpaceAdjust = 0;

  /**
   * the object Id of the procset object
   */
  public  $procsetObjectId;

  /**
   * store the information about the relationship between font families
   * this used so that the code knows which font is the bold version of another font, etc.
   * the value of this array is initialised in the constuctor function.
   */
  public  $fontFamilies =  array();

  /**
   * track if the current font is bolded or italicised
   */
  public  $currentTextState =  '';

  /**
   * messages are stored here during processing, these can be selected afterwards to give some useful debug information
   */
  public  $messages = '';

  /**
   * the ancryption array for the document encryption is stored here
   */
  public  $arc4 = '';

  /**
   * the object Id of the encryption information
   */
  public  $arc4_objnum = 0;

  /**
   * the file identifier, used to uniquely identify a pdf document
   */
  public  $fileIdentifier = '';

  /**
   * a flag to say if a document is to be encrypted or not
   */
  public  $encrypted = 0;

  /**
   * the ancryption key for the encryption of all the document content (structure is not encrypted)
   */
  public  $encryptionKey = '';

  /**
   * array which forms a stack to keep track of nested callback functions
   */
  public  $callback =  array();

  /**
   * the number of callback functions in the callback array
   */
  public  $nCallback =  0;

  /**
   * store label->id pairs for named destinations, these will be used to replace internal links
   * done this way so that destinations can be defined after the location that links to them
   */
  public  $destinations =  array();

  /**
   * store the stack for the transaction commands, each item in here is a record of the values of all the
   * publiciables within the class, so that the user can rollback at will (from each 'start' command)
   * note that this includes the objects array, so these can be large.
   */
  public  $checkpoint =  '';

  /**
   * class constructor
   * this will start a new document
   * @var array array of 4 numbers, defining the bottom left and upper right corner of the page. first two are normally zero.
   */
  function  Cpdf ($pageSize = array(0, 0, 612, 792)) {

    $this->newDocument($pageSize);


    // also initialize the font families that are known about already
    $this->setFontFamily('init');

    //  $this->fileIdentifier = md5('xxxxxxxx'.time());


  }


  /**
   * Document object methods (internal use only)
   *
   * There is about one object method for each type of object in the pdf document
   * Each function has the same call list ($id,$action,$options).
   * $id = the object ID of the object, or what it is to be if it is being created
   * $action = a string specifying the action to be performed, though ALL must support:
   *           'new' - create the object with the id $id
   *           'out' - produce the output for the pdf object
   * $options = optional, a string or array containing the various parameters for the object
   *
   * These, in conjunction with the output function are the ONLY way for output to be produced
   * within the pdf 'file'.
   */

  /**
   *destination object, used to specify the location for the user to jump to, presently on opening
   */
  function  o_destination($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'destination', 'info'=>array());

      $tmp =  '';

      switch  ($options['type']) {

      case  'XYZ':

      case  'FitR':

        $tmp =   ' '.$options['p3'].$tmp;

      case  'FitH':

      case  'FitV':

      case  'FitBH':

      case  'FitBV':

        $tmp =   ' '.$options['p1'].' '.$options['p2'].$tmp;

      case  'Fit':

      case  'FitB':

        $tmp =   $options['type'].$tmp;

        $this->objects[$id]['info']['string'] = $tmp;

        $this->objects[$id]['info']['page'] = $options['page'];
      }

      break;

    case  'out':

      $tmp =  $o['info'];

      $res = "\n".$id." 0 obj\n".'['.$tmp['page'].' 0 R /'.$tmp['string']."]\nendobj\n";

      return  $res;

      break;
    }
  }


  /**
   * set the viewer preferences
   */
  function  o_viewerPreferences($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'viewerPreferences', 'info'=>array());

      break;

    case  'add':

      foreach($options as  $k=>$v) {

        switch  ($k) {

        case  'HideToolbar':

        case  'HideMenubar':

        case  'HideWindowUI':

        case  'FitWindow':

        case  'CenterWindow':

        case  'NonFullScreenPageMode':

        case  'Direction':

          $o['info'][$k] = $v;

          break;
        }
      }

      break;

    case  'out':


      $res = "\n".$id." 0 obj\n".'<< ';

      foreach($o['info'] as  $k=>$v) {

        $res.= "\n/".$k.' '.$v;
      }

      $res.= "\n>>\n";

      return  $res;

      break;
    }
  }


  /**
   * define the document catalog, the overall controller for the document
   */
  function  o_catalog($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'catalog', 'info'=>array());

      $this->catalogId = $id;

      break;

    case  'outlines':

    case  'pages':

    case  'openHere':

      $o['info'][$action] = $options;

      break;

    case  'viewerPreferences':

      if  (!isset($o['info']['viewerPreferences'])) {

        $this->numObj++;

        $this->o_viewerPreferences($this->numObj, 'new');

        $o['info']['viewerPreferences'] = $this->numObj;
      }

      $vp =  $o['info']['viewerPreferences'];

      $this->o_viewerPreferences($vp, 'add', $options);

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n".'<< /Type /Catalog';

      foreach($o['info'] as  $k=>$v) {

        switch ($k) {

        case  'outlines':

          $res.= "\n".'/Outlines '.$v.' 0 R';

          break;

        case  'pages':

          $res.= "\n".'/Pages '.$v.' 0 R';

          break;

        case  'viewerPreferences':

          $res.= "\n".'/ViewerPreferences '.$o['info']['viewerPreferences'].' 0 R';

          break;

        case  'openHere':

          $res.= "\n".'/OpenAction '.$o['info']['openHere'].' 0 R';

          break;
        }
      }

      $res.= " >>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * object which is a parent to the pages in the document
   */
  function  o_pages($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'pages', 'info'=>array());

      $this->o_catalog($this->catalogId, 'pages', $id);

      break;

    case  'page':

      if  (!is_array($options)) {

        // then it will just be the id of the new page
        $o['info']['pages'][] = $options;
      } else {

        // then it should be an array having 'id','rid','pos', where rid=the page to which this one will be placed relative
        // and pos is either 'before' or 'after', saying where this page will fit.
        if  (isset($options['id']) &&  isset($options['rid']) &&  isset($options['pos'])) {

          $i =  array_search($options['rid'], $o['info']['pages']);

          if  (isset($o['info']['pages'][$i]) &&  $o['info']['pages'][$i] == $options['rid']) {

            // then there is a match
            // make a space
            switch  ($options['pos']) {

            case  'before':

              $k =  $i;

              break;

            case  'after':

              $k = $i+1;

              break;

            default:

              $k = -1;

              break;
            }

            if  ($k >= 0) {

              for  ($j = count($o['info']['pages']) -1;$j >= $k;$j--) {

                $o['info']['pages'][$j+1] = $o['info']['pages'][$j];
              }

              $o['info']['pages'][$k] = $options['id'];
            }
          }
        }
      }

      break;

    case  'procset':

      $o['info']['procset'] = $options;

      break;

    case  'mediaBox':