pdfPage.cs :  » PDF » SharpPDF » sharpPDF » C# / CSharp Open Source

using System;
using System.Collections;
using System.Text;
using System.Drawing;

using sharpPDF.Elements;
using sharpPDF.Exceptions;
using sharpPDF.Enumerators;
using sharpPDF.Fonts;

namespace sharpPDF{
  /// <summary>
  /// A Class that implements a PDF page.
  /// </summary>
  public class pdfPage : pdfBasePage, IWritable
  {
  
    private int _height;
    private int _width;
    private int _objectID;
    private int _pageTreeID;    

    /// <summary>
    /// Page's ID
    /// </summary>
    public int objectID 
    {
      get
      {
        return _objectID;
      }

      set
      {
        _objectID = value;
      }

    }

    /// <summary>
    /// PageTree's ID
    /// </summary>
    public int pageTreeID 
    {
      get
      {
        return _pageTreeID;
      }

      set
      {
        _pageTreeID = value;
      }

    }

    /// <summary>
    /// Page's height
    /// </summary>
    public int height
    {
      get
      {
        return _height;
      }
    }

    /// <summary>
    /// Page's width
    /// </summary>
    public int width
    {
      get
      {
        return _width;
      }
    }

    /// <summary>
    /// Class's constructor
    /// </summary>
    internal pdfPage(pdfDocument containerDoc):base(containerDoc)
    {
      _height = 792;
            _width = 612;      
    }

    /// <summary>
    /// Class's constructor
    /// </summary>
    internal pdfPage(predefinedPageSize predefinedSize, pdfDocument containerDoc):base(containerDoc)
    {
      switch (predefinedSize) {
        case predefinedPageSize.csSharpPDFFormat:
          _height = 792;
          _width = 612;      
          break;
        case predefinedPageSize.csA1Page:
          _height = 2288;
          _width = 1655;      
          break;
        case predefinedPageSize.csA2Page:
          _height = 1684;
          _width = 1191;      
          break;
        case predefinedPageSize.csA3Page:
          _height = 1191;
          _width = 842;      
          break;
        case predefinedPageSize.csA4Page:
          _height = 842;
          _width = 595;      
          break;
      }
    }

    /// <summary>
    /// Class's constructor
    /// </summary>
    /// <param name="newHeight">Page's height</param>
    /// <param name="newWidth">Page's width</param>
    /// <param name="containerDoc">Container Document</param>
    internal pdfPage(int newHeight, int newWidth, pdfDocument containerDoc):base(containerDoc)
    {
      _height = newHeight;
            _width = newWidth;
    }

    /// <summary>
    /// Class's distructor
    /// </summary>
    ~pdfPage()
    {
      _containerDoc = null;
      _elements = null;
    }

    /// <summary>
    /// Private method that returns the fonts object to the page object
    /// </summary>
    /// <returns>A string with fonts reference</returns>
    private string addFonts()
    {
      StringBuilder resultString = new StringBuilder();
      foreach (pdfAbstractFont font in _containerDoc._fonts.Values) {
        resultString.Append("/F" + font.fontNumber.ToString() + " " + font.objectID.ToString() +" 0 R " ); 
      }
      return resultString.ToString();      
    }

    /// <summary>
    /// Private method that returns the images object to the page object
    /// </summary>
    /// <returns>A string with image reference</returns>
    private string addImages()
    {
      StringBuilder resultString = new StringBuilder();
      foreach (pdfImageReference image in _containerDoc._images.Values) 
      {
        resultString.Append("/I" + image.ObjectID.ToString() + " " + image.ObjectID.ToString() +" 0 R " ); 
      }
      return resultString.ToString();      
    }
  
    /// <summary>
    /// Method that returns the PDF codes to write the page in the document
    /// </summary>
    /// <returns>String that contains PDF codes</returns>
    public string getText() 
    {
      StringBuilder pageContent = new StringBuilder();
            StringBuilder objContent = new StringBuilder();
            StringBuilder imgContent = new StringBuilder();        
      StringBuilder annotContent = new StringBuilder();
            pageContent.Append(_objectID.ToString() + " 0 obj" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("<<" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("/Type /Page" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("/Parent " + _pageTreeID.ToString() + " 0 R" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("/Resources <<" + Convert.ToChar(13) + Convert.ToChar(10));
      if (_containerDoc._fonts.Count > 0) {
        pageContent.Append("/Font <<" + addFonts() + ">>" + Convert.ToChar(13) + Convert.ToChar(10));
      }
            if (_containerDoc._images.Count > 0)
      {
        pageContent.Append("/XObject <<" + addImages() + ">>" + Convert.ToChar(13) + Convert.ToChar(10));
      }
            pageContent.Append(">>" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("/MediaBox [0 0 " + _width + " " + _height + "]" + Convert.ToChar(13) + Convert.ToChar(10));
      pageContent.Append("/CropBox [0 0 " + _width + " " + _height + "]" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("/Rotate 0" + Convert.ToChar(13) + Convert.ToChar(10));
      pageContent.Append("/ProcSet [/PDF /Text /ImageC]" + Convert.ToChar(13) + Convert.ToChar(10));
      foreach( pdfElement item in _elements) {
        if (item is annotationElement) {
          // smeyer82: Get all annotation elements
          annotContent.Append(item.objectID.ToString() + " 0 R ");
        } else {
          objContent.Append(item.objectID.ToString() + " 0 R ");        
        }
      }
      if (objContent.Length > 0)
      {
        pageContent.Append("/Contents [" + objContent.ToString() + "]" + Convert.ToChar(13) + Convert.ToChar(10));
      }
      //smeyer82: create annotation entrys
      if (annotContent.Length > 0)
      {
        pageContent.Append("/Annots [" + annotContent.ToString()+ "]" + Convert.ToChar(13) + Convert.ToChar(10));
      }
            pageContent.Append(">>" + Convert.ToChar(13) + Convert.ToChar(10));
            pageContent.Append("endobj" + Convert.ToChar(13) + Convert.ToChar(10));
      objContent = null;
      imgContent = null;
            return pageContent.ToString();
    }
  }
}