Page.java

//
// Android PDF Writer
// http://coderesearchlabs.com/androidpdfwriter
//
// by Javier Santo Domingo (j-a-s-d@coderesearchlabs.com)
//

package totalcross.util.pdf;

import java.util.ArrayList;

public class Page
{

   private PDFDocument mDocument;
   private IndirectObject mIndirectObject;
   private ArrayList<IndirectObject> mPageFonts;
   private ArrayList<XObjectImage> mXObjects;
   private IndirectObject mPageContents;

   public Page(PDFDocument document)
   {
      mDocument = document;
      mIndirectObject = mDocument.newIndirectObject();
      mPageFonts = new ArrayList<IndirectObject>();
      mXObjects = new ArrayList<XObjectImage>();
      setFont(StandardFonts.SUBTYPE, StandardFonts.TIMES_ROMAN, StandardFonts.WIN_ANSI_ENCODING);
      mPageContents = mDocument.newIndirectObject();
      mDocument.includeIndirectObject(mPageContents);
   }

   public IndirectObject getIndirectObject()
   {
      return mIndirectObject;
   }

   private String getFontReferences()
   {
      String result = "";
      if (!mPageFonts.isEmpty())
      {
         result = "    /Font <<\n";
         int x = 0;
         for (IndirectObject lFont : mPageFonts)
         {
            result += "      /F" + Integer.toString(++x) + " " + lFont.getIndirectReference() + "\n";
         }
         result += "    >>\n";
      }
      return result;
   }

   private String getXObjectReferences()
   {
      String result = "";
      if (!mXObjects.isEmpty())
      {
         result = "    /XObject <<\n";
         for (XObjectImage xObj : mXObjects)
         {
            result += "      " + xObj.asXObjectReference() + "\n";
         }
         result += "    >>\n";
      }
      return result;
   }

   public void render(String pagesIndirectReference)
   {
      mIndirectObject.setDictionaryContent("  /Type /Page\n  /Parent " + pagesIndirectReference + "\n" + "  /Resources <<\n" + getFontReferences()
            + getXObjectReferences() + "  >>\n" + "  /Contents " + mPageContents.getIndirectReference() + "\n");
   }

   public void setFont(String subType, String baseFont)
   {
      IndirectObject lFont = mDocument.newIndirectObject();
      mDocument.includeIndirectObject(lFont);
      lFont.setDictionaryContent("  /Type /Font\n  /Subtype /" + subType + "\n  /BaseFont /" + baseFont + "\n");
      mPageFonts.add(lFont);
   }

   public void setFont(String subType, String baseFont, String encoding)
   {
      IndirectObject lFont = mDocument.newIndirectObject();
      mDocument.includeIndirectObject(lFont);
      lFont.setDictionaryContent("  /Type /Font\n  /Subtype /" + subType + "\n  /BaseFont /" + baseFont + "\n  /Encoding /" + encoding + "\n");
      mPageFonts.add(lFont);
   }

   private void addContent(String content)
   {
      mPageContents.addStreamContent(content);
      String streamContent = mPageContents.getStreamContent();
      mPageContents.setDictionaryContent("  /Length " + Integer.toString(streamContent.length()) + "\n");
      mPageContents.setStreamContent(streamContent);
   }

   public void addRawContent(String rawContent)
   {
      addContent(rawContent);
   }

   public void addText(int leftPosition, int topPositionFromBottom, int fontSize, String text)
   {
      addText(leftPosition, topPositionFromBottom, fontSize, text, Transformation.DEGREES_0_ROTATION);
   }

   public void addText(int leftPosition, int topPositionFromBottom, int fontSize, String text, String transformation)
   {
      addContent("BT\n" + transformation + " " + Integer.toString(leftPosition) + " " + Integer.toString(topPositionFromBottom) + " Tm\n" + "/F"
            + Integer.toString(mPageFonts.size()) + " " + Integer.toString(fontSize) + " Tf\n" + "(" + text + ") Tj\n" + "ET\n");
   }

   public void addTextAsHex(int leftPosition, int topPositionFromBottom, int fontSize, String hex)
   {
      addTextAsHex(leftPosition, topPositionFromBottom, fontSize, hex, Transformation.DEGREES_0_ROTATION);
   }

   public void addTextAsHex(int leftPosition, int topPositionFromBottom, int fontSize, String hex, String transformation)
   {
      addContent("BT\n" + transformation + " " + Integer.toString(leftPosition) + " " + Integer.toString(topPositionFromBottom) + " Tm\n" + "/F"
            + Integer.toString(mPageFonts.size()) + " " + Integer.toString(fontSize) + " Tf\n" + "<" + hex + "> Tj\n" + "ET\n");
   }

   public void addLine(int fromLeft, int fromBottom, int toLeft, int toBottom)
   {
      addContent(Integer.toString(fromLeft) + " " + Integer.toString(fromBottom) + " m\n" + Integer.toString(toLeft) + " " + Integer.toString(toBottom)
            + " l\nS\n");
   }

   public void addRectangle(int fromLeft, int fromBottom, int toLeft, int toBottom)
   {
      addContent(Integer.toString(fromLeft) + " " + Integer.toString(fromBottom) + " " + Integer.toString(toLeft) + " " + Integer.toString(toBottom)
            + " re\nS\n");
   }

   private String ensureXObjectImage(XObjectImage xObject)
   {
      for (XObjectImage x : mXObjects)
      {
         if (x.getId().equals(xObject.getId())) { return x.getName(); }
      }
      mXObjects.add(xObject);
      xObject.appendToDocument();
      return xObject.getName();
   }

   public void addImage(int fromLeft, int fromBottom, int width, int height, XObjectImage xImage, String transformation)
   {
      final String name = ensureXObjectImage(xImage);
      final String translate = "1 0 0 1 " + fromLeft + " " + fromBottom;
      final String scale = "" + width + " 0 0 " + height + " 0 0";
      final String rotate = transformation + " 0 0";
      addContent("q\n" + translate + " cm\n" + rotate + " cm\n" + scale + " cm\n" + name + " Do\n" + "Q\n");
   }
}