context: using System;
  using iTextSharp.text;
  /*
   * The contents of this file are subject to the Mozilla Public License Version 1.1
   * (the "License"); you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at http://www.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   * for the specific language governing rights and limitations under the License.
   *
   * The Original Code is 'iText, a free JAVA-PDF library'.
   *
   * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
   * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
   * All Rights Reserved.
   * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
   * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
   *
   * Contributor(s): all the names of the contributors are added in the source code
   * where applicable.
   *
   * Alternatively, the contents of this file may be used under the terms of the
   * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
   * provisions of LGPL are applicable instead of those above.  If you wish to
   * allow use of your version of this file only under the terms of the LGPL
   * License and not to allow others to use your version of this file under
   * the MPL, indicate your decision by deleting the provisions above and
   * replace them with the notice and other provisions required by the LGPL.
   * If you do not delete the provisions above, a recipient may use your version
   * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the MPL as stated above or under the terms of the GNU
   * Library General Public License as published by the Free Software Foundation;
   * either version 2 of the License, or 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 Library general Public License for more
   * details.
   *
   * If you didn't download this code from the following link, you should check if
   * you aren't using an obsolete version:
   * http://www.lowagie.com/iText/
   */
  
  namespace iTextSharp.text.pdf {
  
      /**
       * Implements the pattern.
       */
  
      public class PdfPatternPainter : PdfTemplate {
      
          protected float xstep, ystep;
          protected bool stencil = false;
          protected Color defaultColor;
      
          /**
           *Creates a <CODE>PdfPattern</CODE>.
           */
      
          private PdfPatternPainter() : base(null) {
              type = TYPE_PATTERN;
          }
      
          /**
           * Creates new PdfPattern
           *
           * @param wr the <CODE>PdfWriter</CODE>
           */
      
          internal PdfPatternPainter(PdfWriter wr) : base(wr) {
              type = TYPE_PATTERN;
          }
      
          internal PdfPatternPainter(PdfWriter wr, Color defaultColor) : this(wr) {
              stencil = true;
              if (defaultColor == null)
                  this.defaultColor = new Color(System.Drawing.Color.Gray);
              else
                  this.defaultColor = defaultColor;
          }
      
          public float XStep {
              get {
                  return this.xstep;
              }
  
              set {
                  this.xstep = value;
              }
          }
      
          public float YStep {
              get {
                  return this.ystep;
              }
  
              set {
                  this.ystep = value;
              }
          }
      
          public bool IsStencil() {
              return stencil;
          }
      
          public void SetPatternMatrix(float a, float b, float c, float d, float e, float f) {
              SetMatrix(a, b, c, d, e, f);
          }
          /**
           * Gets the stream representing this pattern
           *
           * @return the stream representing this pattern
           */
      
          internal PdfPattern Pattern {
              get {
                  return new PdfPattern(this);
              }
          }
      
          /**
           * Gets a duplicate of this <CODE>PdfPatternPainter</CODE>. All
           * the members are copied by reference but the buffer stays different.
           * @return a copy of this <CODE>PdfPatternPainter</CODE>
           */
      
          public override PdfContentByte Duplicate {
              get {
                  PdfPatternPainter tpl = new PdfPatternPainter();
                  tpl.writer = writer;
                  tpl.pdf = pdf;
                  tpl.thisReference = thisReference;
                  tpl.pageResources = pageResources;
                  tpl.bBox = new Rectangle(bBox);
                  tpl.xstep = xstep;
                  tpl.ystep = ystep;
                  tpl.matrix = matrix;
                  tpl.stencil = stencil;
                  tpl.defaultColor = defaultColor;
                  return tpl;
              }
          }
      
          public Color DefaultColor {
              get {
                  return defaultColor;
              }
          }
      
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setGrayFill(float)
          */
          public override void SetGrayFill(float gray) {
              CheckNoColor();
              base.SetGrayFill(gray);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#resetGrayFill()
          */
          public override void ResetGrayFill() {
              CheckNoColor();
              base.ResetGrayFill();
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setGrayStroke(float)
          */
          public override void SetGrayStroke(float gray) {
              CheckNoColor();
              base.SetGrayStroke(gray);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#resetGrayStroke()
          */
          public override void ResetGrayStroke() {
              CheckNoColor();
              base.ResetGrayStroke();
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setRGBColorFillF(float, float, float)
          */
          public override void SetRGBColorFillF(float red, float green, float blue) {
              CheckNoColor();
              base.SetRGBColorFillF(red, green, blue);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#resetRGBColorFill()
          */
          public override void ResetRGBColorFill() {
              CheckNoColor();
              base.ResetRGBColorFill();
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setRGBColorStrokeF(float, float, float)
          */
          public override void SetRGBColorStrokeF(float red, float green, float blue) {
              CheckNoColor();
              base.SetRGBColorStrokeF(red, green, blue);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#resetRGBColorStroke()
          */
          public override void ResetRGBColorStroke() {
              CheckNoColor();
              base.ResetRGBColorStroke();
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setCMYKColorFillF(float, float, float, float)
          */
          public override void SetCMYKColorFillF(float cyan, float magenta, float yellow, float black) {
              CheckNoColor();
              base.SetCMYKColorFillF(cyan, magenta, yellow, black);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#resetCMYKColorFill()
          */
          public override void ResetCMYKColorFill() {
              CheckNoColor();
              base.ResetCMYKColorFill();
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setCMYKColorStrokeF(float, float, float, float)
          */
          public override void SetCMYKColorStrokeF(float cyan, float magenta, float yellow, float black) {
              CheckNoColor();
              base.SetCMYKColorStrokeF(cyan, magenta, yellow, black);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#resetCMYKColorStroke()
          */
          public override void ResetCMYKColorStroke() {
              CheckNoColor();
              base.ResetCMYKColorStroke();
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#addImage(com.lowagie.text.Image, float, float, float, float, float, float)
          */
          public override void AddImage(Image image, float a, float b, float c, float d, float e, float f) {
              if (stencil && !image.IsMask())
                  CheckNoColor();
              base.AddImage(image, a, b, c, d, e, f);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setCMYKColorFill(int, int, int, int)
          */
          public override void SetCMYKColorFill(int cyan, int magenta, int yellow, int black) {
              CheckNoColor();
              base.SetCMYKColorFill(cyan, magenta, yellow, black);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setCMYKColorStroke(int, int, int, int)
          */
          public override void SetCMYKColorStroke(int cyan, int magenta, int yellow, int black) {
              CheckNoColor();
              base.SetCMYKColorStroke(cyan, magenta, yellow, black);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setRGBColorFill(int, int, int)
          */
          public override void SetRGBColorFill(int red, int green, int blue) {
              CheckNoColor();
              base.SetRGBColorFill(red, green, blue);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setRGBColorStroke(int, int, int)
          */
          public override void SetRGBColorStroke(int red, int green, int blue) {
              CheckNoColor();
              base.SetRGBColorStroke(red, green, blue);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setColorStroke(java.awt.Color)
          */
          public override void SetColorStroke(Color color) {
              CheckNoColor();
              base.SetColorStroke(color);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setColorFill(java.awt.Color)
          */
          public override void SetColorFill(Color color) {
              CheckNoColor();
              base.SetColorFill(color);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setColorFill(com.lowagie.text.pdf.PdfSpotColor, float)
          */
          public override void SetColorFill(PdfSpotColor sp, float tint) {
              CheckNoColor();
              base.SetColorFill(sp, tint);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setColorStroke(com.lowagie.text.pdf.PdfSpotColor, float)
          */
          public override void SetColorStroke(PdfSpotColor sp, float tint) {
              CheckNoColor();
              base.SetColorStroke(sp, tint);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setPatternFill(com.lowagie.text.pdf.PdfPatternPainter)
          */
          public override void SetPatternFill(PdfPatternPainter p) {
              CheckNoColor();
              base.SetPatternFill(p);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setPatternFill(com.lowagie.text.pdf.PdfPatternPainter, java.awt.Color, float)
          */
          public override void SetPatternFill(PdfPatternPainter p, Color color, float tint) {
              CheckNoColor();
              base.SetPatternFill(p, color, tint);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setPatternStroke(com.lowagie.text.pdf.PdfPatternPainter, java.awt.Color, float)
          */
          public override void SetPatternStroke(PdfPatternPainter p, Color color, float tint) {
              CheckNoColor();
              base.SetPatternStroke(p, color, tint);
          }
          
          /**
          * @see com.lowagie.text.pdf.PdfContentByte#setPatternStroke(com.lowagie.text.pdf.PdfPatternPainter)
          */
          public override void SetPatternStroke(PdfPatternPainter p) {
              CheckNoColor();
              base.SetPatternStroke(p);
          }
      
  
gt:         internal void CheckNoColor() {