FormXObject.cs :  » PDF » PDF-Clown » it » stefanochizzolini » clown » documents » contents » xObjects » C# / CSharp Open Source

/*
  Copyright 2006,2007,2008 Stefano Chizzolini. http://clown.stefanochizzolini.it

  Contributors:
    * Stefano Chizzolini (original code developer, http://www.stefanochizzolini.it)

  This file should be part of the source code distribution of "PDF Clown library"
  (the Program): see the accompanying README files for more info.

  This Program is free software; you can redistribute it and/or modify it under
  the terms of the GNU General Public License as published by the Free Software
  Foundation; either version 2 of the License, or (at your option) any later version.

  This Program is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY, either expressed or implied; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the License for more details.

  You should have received a copy of the GNU General Public License along with this
  Program (see README files); if not, go to the GNU website (http://www.gnu.org/).

  Redistribution and use, with or without modification, are permitted provided that such
  redistributions retain the above copyright notice, license and disclaimer, along with
  this list of conditions.
*/

using it.stefanochizzolini.clown.documents;
using it.stefanochizzolini.clown.documents.contents;
using it.stefanochizzolini.clown.documents.contents.composition;
using it.stefanochizzolini.clown.documents.contents.objects;
using it.stefanochizzolini.clown.files;
using it.stefanochizzolini.clown.objects;

using System;
using System.Drawing;

namespace it.stefanochizzolini.clown.documents.contents.xObjects{
  /**
    <summary>Form external object [PDF:1.6:4.9].</summary>
  */
  public class FormXObject
    : XObject,
      IContentContext
  {
    #region dynamic
    #region constructors
    /**
      <summary>Creates a new form within the given document context, using default resources.</summary>
    */
    public FormXObject(
      Document context
      ) : this(
        context,
        null
        )
    {}

    /**
      <summary>Creates a new form within the given document context, using custom resources.</summary>
    */
    public FormXObject(
      Document context,
      Resources resources
      ) : base(context)
    {
      PdfDictionary header = BaseDataObject.Header;
      header[PdfName.Subtype] = PdfName.Form;
      header[PdfName.BBox] = new PdfRectangle(0,0,0,0);

      // No resources collection?
      /* NOTE: Resources collection is mandatory. */
      if(resources == null)
      {resources = new Resources(context);}
      header[PdfName.Resources] = resources.BaseObject;
    }

    internal FormXObject(
      PdfDirectObject baseObject
      ) : base(baseObject)
    {}
    #endregion

    #region interface
    #region public
    public override object Clone(
      Document context
      )
    {throw new NotImplementedException();}

    public override double[] GetMatrix(
      )
    {
      /*
        NOTE: Form-space-to-user-space matrix is identity [1 0 0 1 0 0] by default,
        but may be adjusted by setting the Matrix entry in the form dictionary [PDF:1.6:4.9].
      */
      PdfArray matrix = (PdfArray)File.Resolve(
        BaseDataObject.Header[PdfName.Matrix]
        );
      if(matrix == null)
      {
        return new double[]
          {
            1, // a.
            0, // b.
            0, // c.
            1, // d.
            0, // e.
            0 // f.
          };
      }
      else
      {
        return new double[]
          {
            ((IPdfNumber)matrix[0]).RawValue, // a.
            ((IPdfNumber)matrix[1]).RawValue, // b.
            ((IPdfNumber)matrix[2]).RawValue, // c.
            ((IPdfNumber)matrix[3]).RawValue, // d.
            ((IPdfNumber)matrix[4]).RawValue, // e.
            ((IPdfNumber)matrix[5]).RawValue // f.
          };
      }
    }

    public override Size Size
    {
      get
      {
        PdfArray box = (PdfArray)File.Resolve(
          BaseDataObject.Header[PdfName.BBox]
          );

        return new Size(
          (int)((IPdfNumber)box[2]).RawValue,
          (int)((IPdfNumber)box[3]).RawValue
          );
      }
      set
      {
        PdfDirectObject box = BaseDataObject.Header[PdfName.BBox];

        PdfArray boxObject = (PdfArray)File.Resolve(box);
        ((IPdfNumber)boxObject[2]).RawValue = value.Width;
        ((IPdfNumber)boxObject[3]).RawValue = value.Height;

        File.Update(box);
      }
    }
    #endregion

    #region internal
    #region IContentContext
    public PdfArray Box
    {
      get
      {
        return (PdfArray)File.Resolve(BaseDataObject.Header[PdfName.BBox]); // Required [PDF:1.6:4.9.1].
      }
    }

    public Contents Contents
    {
      get
      {
        return new Contents(
          BaseObject,
          ((PdfReference)BaseObject).IndirectObject,
          this
          );
      }
    }

    /**
      <summary>Gets/Sets the resources associated to the form.</summary>
    */
    public Resources Resources
    {
      get
      {
        return new Resources(
          BaseDataObject.Header[PdfName.Resources],
          ((PdfReference)BaseObject).IndirectObject
          );
      }
      set
      {BaseDataObject.Header[PdfName.Resources] = value.BaseObject;}
    }

    #region IContentEntity
    public ContentObject ToInlineObject(
      PrimitiveFilter context
      )
    {throw new NotImplementedException();}

    public XObject ToXObject(
      Document context
      )
    {throw new NotImplementedException();}
    #endregion
    #endregion
    #endregion
    #endregion
    #endregion
  }
}