First Import

+# Files and directories created by pub
+.dart_tool/
+.packages
+.pub/
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+library pdf;
+
+/// http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html
+/// https://brendanzagaeski.appspot.com/0004.html
+/// http://blog.idrsolutions.com/?s=%22Make+your+own+PDF+file%22
+/// https://brendanzagaeski.appspot.com/0005.html
+/// https://github.com/Setasign/FPDF
+/// https://github.com/rev42/tfpdf/blob/master/src/tFPDF.php
+/// http://gnujpdf.sourceforge.net
+/// http://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
+/// https://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation
+/// https://www.pdf-online.com/osa/validate.aspx
+
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+import 'package:vector_math/vector_math_64.dart';
+import 'package:image/image.dart';
+import 'package:ttf_parser/ttf_parser.dart';
+
+part 'src/ascii85.dart';
+part 'src/array.dart';
+part 'src/border.dart';
+part 'src/catalog.dart';
+part 'src/color.dart';
+part 'src/document.dart';
+part 'src/font.dart';
+part 'src/font_descriptor.dart';
+part 'src/formxobject.dart';
+part 'src/info.dart';
+part 'src/object.dart';
+part 'src/object_stream.dart';
+part 'src/outline.dart';
+part 'src/output.dart';
+part 'src/page.dart';
+part 'src/page_format.dart';
+part 'src/page_list.dart';
+part 'src/point.dart';
+part 'src/polygon.dart';
+part 'src/annotation.dart';
+part 'src/graphics.dart';
+part 'src/image.dart';
+part 'src/rect.dart';
+part 'src/stream.dart';
+part 'src/ttffont.dart';
+part 'src/xobject.dart';
+part 'src/xref.dart';

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFAnnot extends PDFObject {
+  /// Solid border. The border is drawn as a solid line.
+  static const SOLID = 0;
+
+  /// The border is drawn with a dashed line.
+  static const DASHED = 1;
+
+  /// The border is drawn in a beveled style (faux three-dimensional) such
+  /// that it looks as if it is pushed out of the page (opposite of INSET)
+  static const BEVELED = 2;
+
+  /// The border is drawn in an inset style (faux three-dimensional) such
+  /// that it looks as if it is inset into the page (opposite of BEVELED)
+  static const INSET = 3;
+
+  /// The border is drawn as a line on the bottom of the annotation rectangle
+  static const UNDERLINED = 4;
+
+  /// The subtype of the outline, ie text, note, etc
+  final String subtype;
+
+  /// The size of the annotation
+  final double l, b, r, t;
+
+  /// The text of a text annotation
+  final String s;
+
+  /// flag used to indicate that the destination should fit the screen
+  static const FULL_PAGE = -9999.0;
+
+  /// Link to the Destination page
+  PDFObject dest;
+
+  /// If fl!=FULL_PAGE then this is the region of the destination page shown.
+  /// Otherwise they are ignored.
+  final double fl, fb, fr, ft;
+
+  /// the border for this annotation
+  PDFBorder border;
+
+  PDFAnnot(PDFPage pdfPage,
+      {String type, this.s, this.l, this.b, this.r, this.t, this.subtype, this.dest, this.fl, this.fb, this.fr, this.ft})
+      : super(pdfPage.pdfDocument, type) {
+    pdfPage.annotations.add(this);
+  }
+
+  /// This is used to create an annotation.
+  /// @param s Subtype for this annotation
+  /// @param l Left coordinate
+  /// @param b Bottom coordinate
+  /// @param r Right coordinate
+  /// @param t Top coordinate
+  factory PDFAnnot.annotation(PDFPage pdfPage, String s, double l, double b, double r, double t) =>
+      new PDFAnnot(pdfPage, type: "/Annot", s: s, l: l, b: b, r: r, t: t);
+
+  /// Creates a text annotation
+  /// @param l Left coordinate
+  /// @param b Bottom coordinate
+  /// @param r Right coordinate
+  /// @param t Top coordinate
+  /// @param s Text for this annotation
+  factory PDFAnnot.text(PDFPage pdfPage, double l, double b, double r, double t, String s) =>
+      new PDFAnnot(pdfPage, type: "/Text", l: l, b: b, r: r, t: t, s: s);
+
+  /// Creates a link annotation
+  /// @param l Left coordinate
+  /// @param b Bottom coordinate
+  /// @param r Right coordinate
+  /// @param t Top coordinate
+  /// @param dest Destination for this link. The page will fit the display.
+  /// @param fl Left coordinate
+  /// @param fb Bottom coordinate
+  /// @param fr Right coordinate
+  /// @param ft Top coordinate
+  /// <br><br>Rectangle describing what part of the page to be displayed
+  /// (must be in User Coordinates)
+  factory PDFAnnot.link(PDFPage pdfPage, double l, double b, double r, double t, PDFObject dest,
+          [double fl = FULL_PAGE, double fb = FULL_PAGE, double fr = FULL_PAGE, double ft = FULL_PAGE]) =>
+      new PDFAnnot(pdfPage, type: "/Link", l: l, b: b, r: r, t: t, dest: dest, fl: fl, fb: fb, fr: fr, ft: ft);
+
+  /// Sets the border for the annotation. By default, no border is defined.
+  ///
+  /// <p>If the style is DASHED, then this method uses PDF's default dash
+  /// scheme {3}
+  ///
+  /// <p>Important: the annotation must have been added to the document before
+  /// this is used. If the annotation was created using the methods in
+  /// PDFPage, then the annotation is already in the document.
+  ///
+  /// @param style Border style SOLID, DASHED, BEVELED, INSET or UNDERLINED.
+  /// @param width Width of the border
+  /// @param dash Array of lengths, used for drawing the dashes. If this
+  /// is null, then the default of {3} is used.
+  void setBorder(double width, {int style = 0, List<double> dash}) {
+    border = new PDFBorder(pdfDocument, width, style: style, dash: dash);
+  }
+
+  /// Output the annotation
+  ///
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    params["/Subtype"] = PDFStream.string(subtype);
+    params["/Rect"] = PDFStream.string("[$l $b $r $t]");
+
+    // handle the border
+    if (border == null) {
+      params["/Border"] = PDFStream.string("[0 0 0]");
+    } else {
+      params["/BS"] = border.ref();
+    }
+
+    // Now the annotation subtypes
+    if (subtype == "/Text") {
+      params["/Contents"] = PDFStream.string(s);
+    } else if (subtype == "/Link") {
+      var dests = new List<PDFStream>();
+      dests.add(dest.ref());
+      if (fl == FULL_PAGE)
+        dests.add(PDFStream.string("/Fit"));
+      else {
+        dests.add(PDFStream.string("/FitR $fl $fb $fr $ft"));
+      }
+      params["/Dest"] = PDFStream.array(dests);
+    }
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFArrayObject extends PDFObject {
+  final List<String> values;
+
+  PDFArrayObject(PDFDocument pdfDocument, this.values) : super(pdfDocument);
+
+  @override
+  void writeContent(PDFStream os) {
+    super.writeContent(os);
+
+    os.putStringArray(values);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class Ascii85Encoder extends Converter<Uint8List, Uint8List> {
+  Uint8List convert(Uint8List input) {
+    Uint8List buffer = new Uint8List(_maxEncodedLen(input.length) + 2);
+
+    var b = 0;
+    var s = 0;
+
+    while (s < input.length) {
+      buffer[b + 0] = 0;
+      buffer[b + 1] = 0;
+      buffer[b + 2] = 0;
+      buffer[b + 3] = 0;
+      buffer[b + 4] = 0;
+
+      // Unpack 4 bytes into int to repack into base 85 5-byte.
+      int v = 0;
+
+      switch (input.length - s) {
+        case 3:
+          v |= input[s + 0] << 24;
+          v |= input[s + 1] << 16;
+          v |= input[s + 2] << 8;
+          break;
+        case 2:
+          v |= input[s + 0] << 24;
+          v |= input[s + 1] << 16;
+          break;
+        case 1:
+          v |= input[s + 0] << 24;
+          break;
+        default:
+          v |= input[s + 0] << 24;
+          v |= input[s + 1] << 16;
+          v |= input[s + 2] << 8;
+          v |= input[s + 3];
+      }
+
+      // Special case: zero (!!!!!) shortens to z.
+      if (v == 0 && input.length - s >= 4) {
+        buffer[b] = 122;
+        b++;
+        s += 4;
+        continue;
+      }
+
+      // Otherwise, 5 base 85 digits starting at !.
+      for (int i = 4; i >= 0; i--) {
+        buffer[b + i] = 33 + v % 85;
+        v ~/= 85;
+      }
+
+      // If input was short, discard the low destination bytes.
+      var m = 5;
+      if (input.length - s < 4) {
+        m -= 4 - (input.length - s);
+        break;
+      } else {
+        s += 4;
+      }
+
+      b += m;
+    }
+
+    buffer[b] = 0x7e;
+    buffer[b + 1] = 0x3e;
+
+    return buffer.sublist(0, b + 2);
+  }
+
+  int _maxEncodedLen(int n) => (n + 3) ~/ 4 * 5;
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFBorder extends PDFObject {
+  /// The style of the border
+  final int style;
+
+  /// The width of the border
+  final double width;
+
+  /// This array allows the definition of a dotted line for the border
+  final List<double> dash;
+
+  /// Creates a border using the predefined styles in PDFAnnot.
+  /// <p>Note: Do not use PDFAnnot.DASHED with this method.
+  /// Use the other constructor.
+  ///
+  /// @param width The width of the border
+  /// @param style The style of the border
+  /// @param dash The line pattern definition
+  /// @see PDFAnnot
+  PDFBorder(PDFDocument pdfDocument, this.width, {this.style = 0, this.dash}) : super(pdfDocument);
+
+  /// @param os OutputStream to send the object to
+  @override
+  void writeContent(PDFStream os) {
+    super.writeContent(os);
+
+    var data = new List<PDFStream>();
+    data.add(PDFStream.string("/S"));
+    data.add(PDFStream.string("/" + "SDBIU".substring(style, style + 1)));
+    data.add(PDFStream.string("/W $width"));
+    if (dash != null) {
+      data.add(PDFStream.string("/D"));
+      data.add(PDFStream.array(dash.map((double d) => PDFStream.num(d))));
+    }
+    os.putArray(data);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFCatalog extends PDFObject {
+  /// The pages of the document
+  final PDFPageList pdfPageList;
+
+  /// The outlines of the document
+  PDFOutline outlines;
+
+  /// The initial page mode
+  final PDFPageMode pageMode;
+
+  /// This constructs a PDF Catalog object
+  ///
+  /// @param pdfPageList The PDFPageList object that's the root
+  ///        of the documents page tree
+  /// @param pagemode How the document should appear when opened.
+  /// Allowed values are USENONE, USEOUTLINES, USETHUMBS or FULLSCREEN.
+  PDFCatalog(PDFDocument pdfDocument, this.pdfPageList, this.pageMode) : super(pdfDocument, "/Catalog");
+
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    params["/Pages"] = pdfPageList.ref();
+
+    // the Outlines object
+    if (outlines != null && outlines.outlines.length > 0) {
+      params["/Outlines"] = outlines.ref();
+    }
+
+    // the /PageMode setting
+    params["/PageMode"] = PDFStream.string(PDFDocument._PDF_PAGE_MODES[pageMode.index]);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFColor {
+  final double a;
+  final double r;
+  final double g;
+  final double b;
+
+  static var black = new PDFColor(0.0, 0.0, 0.0);
+
+  PDFColor(this.r, this.g, this.b, [this.a = 1.0]);
+
+  factory PDFColor.fromInt(int color) {
+    return new PDFColor(
+        (color >> 16 & 0xff) / 255.0, (color >> 8 & 0xff) / 255.0, (color & 0xff) / 255.0, (color >> 24 & 0xff) / 255.0);
+  }
+
+  factory PDFColor.fromHex(String color) {
+    return new PDFColor(
+        (int.parse(color.substring(0, 1), radix: 16) >> 16 & 0xff) / 255.0,
+        (int.parse(color.substring(2, 3), radix: 16) >> 8 & 0xff) / 255.0,
+        (int.parse(color.substring(4, 5), radix: 16) & 0xff) / 255.0,
+        (int.parse(color.substring(6, 7), radix: 16) >> 24 & 0xff) / 255.0);
+  }
+
+  int toInt() =>
+      ((((a * 255.0).round() & 0xff) << 24) |
+      (((r * 255.0).round() & 0xff) << 16) |
+      (((g * 255.0).round() & 0xff) << 8) |
+      (((b * 255.0).round() & 0xff) << 0)) &
+      0xFFFFFFFF;
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+enum PDFPageMode {
+  /// This page mode indicates that the document
+  /// should be opened just with the page visible.  This is the default
+  NONE,
+
+  /// This page mode indicates that the Outlines
+  /// should also be displayed when the document is opened.
+  OUTLINES,
+
+  /// This page mode indicates that the Thumbnails should be visible when the
+  /// document first opens.
+  THUMBS,
+
+  /// This page mode indicates that when the document is opened, it is displayed
+  /// in full-screen-mode. There is no menu bar, window controls nor any other
+  /// window present.
+  FULLSCREEN
+}
+
+/// <p>This class is the base of the PDF generator. A PDFDocument class is
+/// created for a document, and each page, object, annotation,
+/// etc is added to the document.
+/// Once complete, the document can be written to a Stream, and the PDF
+/// document's internal structures are kept in sync.
+class PDFDocument {
+  /// This is used to allocate objects a unique serial number in the document.
+  int _objser;
+
+  /// This vector contains each indirect object within the document.
+  final Set<PDFObject> objects = new Set<PDFObject>();
+
+  /// This is the Catalog object, which is required by each PDF Document
+  PDFCatalog catalog;
+
+  /// This is the info object. Although this is an optional object, we
+  /// include it.
+  PDFInfo info;
+
+  /// This is the Pages object, which is required by each PDF Document
+  PDFPageList pdfPageList;
+
+  /// This is the Outline object, which is optional
+  PDFOutline _outline;
+
+  /// This holds a PDFObject describing the default border for annotations.
+  /// It's only used when the document is being written.
+  PDFObject defaultOutlineBorder;
+
+  /// True if we will compress the stream in the pdf file
+  final bool deflate;
+
+  /// <p>
+  /// These map the page modes just defined to the pagemodes setting of PDF.
+  /// </p>
+  static const _PDF_PAGE_MODES = const ["/UseNone", "/UseOutlines", "/UseThumbs", "/FullScreen"];
+
+  /// This holds the current fonts
+  final Set<PDFFont> fonts = new Set<PDFFont>();
+
+  /// Creates a new serial number
+  int _genSerial() => _objser++;
+
+  /// <p>This creates a PDF document</p>
+  /// @param pagemode an int, determines how the document will present itself to
+  /// the viewer when it first opens.
+  PDFDocument({PDFPageMode pageMode = PDFPageMode.NONE, this.deflate = true}) {
+    _objser = 1;
+
+    // Now create some standard objects
+    pdfPageList = new PDFPageList(this);
+    catalog = new PDFCatalog(this, pdfPageList, pageMode);
+    info = new PDFInfo(this);
+  }
+
+  /// <p>This returns a specific page. It's used mainly when using a
+  /// Serialized template file.</p>
+  ///
+  /// ?? How does a serialized template file work ???
+  ///
+  /// @param page page number to return
+  /// @return PDFPage at that position
+  PDFPage page(int page) {
+    return pdfPageList.getPage(page);
+  }
+
+  /// @return the root outline
+  PDFOutline get outline {
+    if (_outline == null) {
+      _outline = new PDFOutline(this);
+      catalog.outlines = _outline;
+    }
+    return _outline;
+  }
+
+  /// This writes the document to an OutputStream.
+  ///
+  /// <p><b>Note:</b> You can call this as many times as you wish, as long as
+  /// the calls are not running at the same time.
+  ///
+  /// <p>Also, objects can be added or amended between these calls.
+  ///
+  /// <p>Also, the OutputStream is not closed, but will be flushed on
+  /// completion. It is up to the caller to close the stream.
+  ///
+  /// @param os OutputStream to write the document to
+  void write(PDFStream os) {
+    PDFOutput pos = new PDFOutput(os);
+
+    // Write each object to the PDFStream. We call via the output
+    // as that builds the xref table
+    for (PDFObject o in objects) {
+      pos.write(o);
+    }
+
+    // Finally close the output, which writes the xref table.
+    pos.close();
+  }
+
+  Uint8List save() {
+    PDFStream os = new PDFStream();
+    write(os);
+    return os.output();
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFFont extends PDFObject {
+  /// The PDF type of the font, usually /Type1
+  final String subtype;
+
+  /// The font's real name
+  String baseFont;
+
+  /// Constructs a PDFFont. This will attempt to map the font from a known
+  /// Java font name to that in PDF, defaulting to Helvetica if not possible.
+  ///
+  /// @param name The document name, ie /F1
+  /// @param type The pdf type, ie /Type1
+  /// @param font The font name, ie Helvetica
+  /// @param style The java.awt.Font style, ie: Font.PLAIN
+  PDFFont(PDFDocument pdfDocument, {this.subtype = "/Type1", this.baseFont = "/Helvetica"}) : super(pdfDocument, "/Font") {
+    pdfDocument.fonts.add(this);
+  }
+
+  String get name => "/F$objser";
+
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    params["/Subtype"] = PDFStream.string(subtype);
+    params["/Name"] = PDFStream.string(name);
+    params["/BaseFont"] = PDFStream.string(baseFont);
+    params["/Encoding"] = PDFStream.string("/WinAnsiEncoding");
+  }
+
+  double glyphAdvance(int charCode) {
+    return 0.454;
+  }
+
+  PDFRect glyphBounds(int charCode) {
+    return const PDFRect(0.0, 0.0, 0.4, 1.0);
+  }
+
+  PDFRect stringBounds(String s) {
+    var chars = LATIN1.encode(s);
+
+    if (chars.length == 0) return const PDFRect(0.0, 0.0, 0.0, 0.0);
+
+    var n = 0;
+    var c = chars[n];
+    var r = glyphBounds(c);
+    var x = r.x;
+    var y = r.y;
+    var h = r.h;
+    var w = n == chars.length - 1 ? r.w : glyphAdvance(c);
+
+    while (++n < chars.length) {
+      c = chars[n];
+      r = glyphBounds(c);
+      if (r.y < y) y = r.y;
+      if (r.h > h) h = r.h;
+      w += n == chars.length - 1 ? r.w : glyphAdvance(c);
+    }
+
+    return new PDFRect(x, y, w, h);
+  }
+
+  PDFPoint stringSize(String s) {
+    var chars = LATIN1.encode(s);
+
+    var w = 0.0;
+    var h = 0.0;
+
+    for (var c in chars) {
+      var r = glyphBounds(c);
+      if (r.h > h) h = r.h;
+      w += glyphAdvance(c);
+    }
+
+    return new PDFPoint(w, h);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFFontDescriptor extends PDFObject {
+  final PDFObjectStream file;
+  final TtfFont font;
+  final PDFTTFFont ttfFont;
+
+  PDFFontDescriptor(this.ttfFont, this.file, this.font) : super(ttfFont.pdfDocument, "/FontDescriptor");
+
+  @override
+  void prepare() {
+    super.prepare();
+
+    params["/FontName"] = PDFStream.string(ttfFont.baseFont);
+    params["/FontFile2"] = file.ref();
+    params["/Flags"] = PDFStream.intNum(32);
+    params["/FontBBox"] = new PDFStream()..putStringArray([font.head.xMin, font.head.yMin, font.head.xMax, font.head.yMax]);
+    params["/Ascent"] = PDFStream.intNum(font.hhea.ascent);
+    params["/Descent"] = PDFStream.intNum(font.hhea.descent);
+    params["/ItalicAngle"] = PDFStream.intNum(0);
+    params["/CapHeight"] = PDFStream.intNum(10);
+    params["/StemV"] = PDFStream.intNum(79);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFFormXObject extends PDFXObject {
+  /// The fonts associated with this page
+  final fonts = new Map<String, PDFFont>();
+
+  /// The xobjects or other images in the pdf
+  final xobjects = new Map<String, PDFXObject>();
+
+  PDFFormXObject(PDFDocument pdfDocument) : super(pdfDocument, '/Form') {
+    params["/FormType"] = PDFStream.string("1");
+    params["/BBox"] = PDFStream.string("[0 0 1000 1000]");
+  }
+
+  /// set matrix
+  void setMatrix(Matrix4 t) {
+    var s = t.storage;
+    params["/Matrix"] = PDFStream.string("[${s[0]} ${s[1]} ${s[4]} ${s[5]} ${s[12]} ${s[13]}]");
+  }
+
+  @override
+  void prepare() {
+    super.prepare();
+
+    // Now the resources
+    /// This holds any resources for this FormXObject
+    final resources = new Map<String, PDFStream>();
+
+    // fonts
+    if (fonts.length > 0) {
+      resources["/Font"] = new PDFStream()..putObjectDictionary(fonts);
+    }
+
+    // Now the XObjects
+    if (xobjects.length > 0) {
+      resources["/XObject"] = new PDFStream()..putObjectDictionary(xobjects);
+    }
+
+    if (resources.length > 0) {
+      params["/Resources"] = PDFStream.dictionary(resources);
+    }
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+enum PDFLineCap { JOIN_MITER, JOIN_ROUND, JOIN_BEVEL }
+
+class PDFGraphics {
+  /// Graphic context number
+  var _context = 0;
+
+  final PDFPage page;
+
+  final PDFStream buf;
+
+  PDFGraphics(this.page, this.buf);
+
+  PDFFont get defaultFont {
+    if (page.pdfDocument.fonts.length == 0) {
+      new PDFFont(page.pdfDocument);
+    }
+
+    return page.pdfDocument.fonts.elementAt(0);
+  }
+
+  void fillPath() {
+    buf.putString("f\n");
+  }
+
+  void strokePath() {
+    buf.putString("S\n");
+  }
+
+  void closePath() {
+    buf.putString("s\n");
+  }
+
+  void clipPath() {
+    buf.putString("W n\n");
+  }
+
+  /// <p>This releases any resources used by this Graphics object. You must use
+  /// this method once finished with it. Leaving it open will leave the PDF
+  /// stream in an inconsistent state, and will produce errors.</p>
+  /// <p>
+  /// <p>If this was created with Graphics.create() then the parent instance
+  /// can be used again. If not, then this closes the graphics operations for
+  /// this page when used with PDFJob.</p>
+  /// <p>
+  /// <p>When using PDFPage, you can create another fresh Graphics instance,
+  /// which will draw over this one.</p>
+  void restoreContext() {
+    if (_context > 0) {
+      // restore graphics context
+      buf.putString("Q\n");
+      _context--;
+    }
+  }
+
+  void saveContext() {
+    // save graphics context
+    buf.putString("q\n");
+    _context++;
+  }
+
+  /// <p>Draws an image onto the page.</p>
+  /// <p>
+  /// <p>This method is implemented with ASCIIbase85 encoding and the
+  /// zip stream deflater.  It results in a stream that is anywhere
+  /// from 3 to 10 times as big as the image.  This obviously needs some
+  /// improvement, but it works well for small images</p>
+  ///
+  /// @param img The java.awt.Image
+  /// @param x   coordinate on page
+  /// @param y   coordinate on page
+  /// @param w   Width on page
+  /// @param h   height on page
+  /// @param bgcolor Background colour
+  /// @return true if drawn
+  void drawImage(PDFImage img, double x, double y, [double w, double h]) {
+    if (w == null) w = img.width.toDouble();
+    if (h == null) h = img.height.toDouble() * w / img.width.toDouble();
+
+    // The image needs to be registered in the page resources
+    page.xObjects[img.name] = img;
+
+    // q w 0 0 h x y cm % the coordinate matrix
+    buf.putString("q $w 0 0 $h $x $y cm ${img.name} Do Q\n");
+  }
+
+  /// Draws a line between two coordinates.
+  /// <p>
+  /// If the first coordinate is the same as the last one drawn
+  /// (i.e. a previous drawLine, moveto, etc) it is ignored.
+  ///
+  /// @param x1 coordinate
+  /// @param y1 coordinate
+  /// @param x2 coordinate
+  /// @param y2 coordinate
+  void drawLine(double x1, double y1, double x2, double y2) {
+    moveTo(x1, y1);
+    lineTo(x2, y2);
+  }
+
+  /// Draws a polygon, linking the first and last coordinates.
+  ///
+  /// @param xp Array of x coordinates
+  /// @param yp Array of y coordinates
+  /// @param np number of points in polygon
+  void drawPolygon(Polygon p) {
+    _polygon(p.points);
+  }
+
+  void drawEllipse(double x, double y, double r1, double r2) {
+    // The best 4-spline magic number
+    double m4 = 0.551784;
+
+    // Starting point
+    moveTo(x, y - r2);
+
+    buf.putString("${x + m4 * r1} ${y - r2} ${x + r1} ${y - m4 * r2} ${x + r1} $y c\n");
+    buf.putString("${x + r1} ${y + m4 * r2} ${x + m4 * r1} ${y + r2} $x ${y + r2} c\n");
+    buf.putString("${x - m4 * r1} ${y + r2} ${x - r1} ${y + m4 * r2} ${x - r1} $y c\n");
+    buf.putString("${x - r1} ${y - m4 * r2} ${x - m4 * r1} ${y - r2} $x ${y - r2} c\n");
+  }
+
+  /// We override Graphics.drawRect as it doesn't join the 4 lines.
+  /// Also, PDF provides us with a Rectangle operator, so we will use that.
+  ///
+  /// @param x coordinate
+  /// @param y coordinate
+  /// @param w width
+  /// @param h height
+  void drawRect(
+    double x,
+    double y,
+    double w,
+    double h,
+  ) {
+    buf.putString("$x $y $w $h re\n");
+  }
+
+  /// This draws a string.
+  ///
+  /// @param x coordinate
+  /// @param y coordinate
+  /// @oaran s String to draw
+  void drawString(PDFFont font, size, String s, double x, double y) {
+    if (!page.fonts.containsKey(font.name)) {
+      page.fonts[font.name] = font;
+    }
+
+    buf.putString("BT $x $y Td ${font.name} $size Tf ");
+    buf.putText(s);
+    buf.putString(" Tj ET\n");
+  }
+
+  /// Sets the color for drawing
+  ///
+  /// @param c Color to use
+  void setColor(PDFColor color) {
+    buf.putString("${color.r} ${color.g} ${color.b} rg ${color.r} ${color.g} ${color
+            .b} RG\n");
+  }
+
+  /// Set the transformation Matrix
+  void setTransform(Matrix4 t) {
+    var s = t.storage;
+    buf.putString("${s[0]} ${s[1]} ${s[4]} ${s[5]} ${s[12]} ${s[13]} cm\n");
+  }
+
+  /// This adds a line segment to the current path
+  ///
+  /// @param x coordinate
+  /// @param y coordinate
+  void lineTo(double x, double y) {
+    buf.putString("$x $y l\n");
+  }
+
+  /// This moves the current drawing point.
+  ///
+  /// @param x coordinate
+  /// @param y coordinate
+  void moveTo(double x, double y) {
+    buf.putString("$x $y m\n");
+  }
+
+  void drawShape(String d) {
+    var sb = new StringBuffer();
+
+    RegExp exp = new RegExp(r"([MmZzLlHhVvCcSsQqTtAa])|(-[\.0-9]+)|([\.0-9]+)");
+    var matches = exp.allMatches(d);
+    var action;
+    for (var m in matches) {
+      var a = m.group(1);
+      var b = m.group(0);
+      print("$a, $b");
+      if (a != null) {
+        if (action != null) {
+          sb.write("$action ");
+        }
+        action = a;
+      } else {
+        sb.write("$b ");
+      }
+    }
+    print(sb);
+    buf.putString(sb.toString());
+  }
+
+  /// This is used to add a polygon to the current path.
+  /// Used by drawPolygon(), drawPolyline() and fillPolygon() etal
+  ///
+  /// @param p Array of coordinates
+  /// @see #drawPolygon
+  /// @see #drawPolyline
+  /// @see #fillPolygon
+  void _polygon(List<PDFPoint> p) {
+    // newPath() not needed here as moveto does it ;-)
+    moveTo(p[0].w, p[0].h);
+
+    for (int i = 1; i < p.length; i++) lineTo(p[i].w, p[i].h);
+  }
+
+  void setLineCap(PDFLineCap cap) {
+    buf.putString("${cap.index} J\n");
+  }
+
+  void setLineJoin(PDFLineCap join) {
+    buf.putString("${join.index} j\n");
+  }
+
+  void setLineWidth(double width) {
+    buf.putString("$width w\n");
+  }
+
+  void setMiterLimit(double limit) {
+    buf.putString("$limit M\n");
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFImage extends PDFXObject {
+  final Image _img;
+  String _name;
+
+  final bool _alphaChannel;
+
+  /// Creates a new <code>PDFImage</code> instance.
+  ///
+  /// @param img an <code>Image</code> value
+  /// @param x an <code>int</code> value
+  /// @param y an <code>int</code> value
+  /// @param w an <code>int</code> value
+  /// @param h an <code>int</code> value
+  /// @param obs an <code>ImageObserver</code> value
+  PDFImage(PDFDocument pdfDocument, this._img, [this._alphaChannel = false]) : super(pdfDocument, "/Image", isBinary: true) {
+    _name = "/Image$objser";
+    params["/Width"] = PDFStream.string(_img.width.toString());
+    params["/Height"] = PDFStream.string(_img.height.toString());
+    params["/BitsPerComponent"] = PDFStream.intNum(8);
+    params['/Name'] = PDFStream.string(_name);
+
+    if (_alphaChannel == false && _img.numChannels == 4) {
+      var _sMask = new PDFImage(pdfDocument, this._img, true);
+      params["/SMask"] = PDFStream.string("${_sMask.objser} 0 R");
+    }
+
+    if (_alphaChannel) {
+      params["/ColorSpace"] = PDFStream.string("/DeviceGray");
+    } else {
+      params["/ColorSpace"] = PDFStream.string("/DeviceRGB");
+    }
+
+    // write the pixels to the stream
+    // print("Processing image ${img.width}x${img.height} pixels");
+
+    int w = _img.width;
+    int h = _img.height;
+    int s = w * h;
+
+    Uint8List out = new Uint8List(_alphaChannel ? s : s * 3);
+
+    if (_alphaChannel) {
+      for (int i = 0; i < s; i++) {
+        final p = _img.data[i];
+        final int alpha = (p >> 24) & 0xff;
+
+        out[i] = alpha;
+      }
+    } else {
+      for (int i = 0; i < s; i++) {
+        final p = _img.data[i];
+        final int blue = (p >> 16) & 0xff;
+        final int green = (p >> 8) & 0xff;
+        final int red = p & 0xff;
+
+        out[i * 3] = red;
+        out[i * 3 + 1] = green;
+        out[i * 3 + 2] = blue;
+      }
+    }
+
+    buf.putBytes(out);
+  }
+
+  /// Get the value of width.
+  /// @return value of width.
+  int get width => _img.width;
+
+  /// Get the value of height.
+  /// @return value of height.
+  int get height => _img.height;
+
+  /// Get the name
+  ///
+  /// @return a <code>String</code> value
+  String get name => _name;
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFInfo extends PDFObject {
+  String author;
+  String creator;
+  String title;
+  String subject;
+  String keywords;
+
+  /// @param title Title of this document
+  PDFInfo(PDFDocument pdfDocument, {this.title, this.author, this.creator, this.subject, this.keywords})
+      : super(pdfDocument, null) {
+    params["/Producer"] = PDFStream.text("dpdf - David PHAM-VAN");
+  }
+
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    if (author != null) params["/Author"] = PDFStream.text(author);
+    if (creator != null) params["/Creator"] = PDFStream.text(creator);
+    if (title != null) params["/Title"] = PDFStream.text(title);
+    if (subject != null) params["/Subject"] = PDFStream.text(subject);
+    if (keywords != null) params["/Keywords"] = PDFStream.text(keywords);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFObject {
+  /// This is the object parameters.
+  final params = new Map<String, PDFStream>();
+
+  /// This is the unique serial number for this object.
+  final int objser;
+
+  /// This is the generation number for this object.
+  final int objgen = 0;
+
+  /// This allows any PDF object to refer to the document being constructed.
+  final PDFDocument pdfDocument;
+
+  /// This is usually called by extensors to this class, and sets the
+  /// PDF Object Type
+  /// @param type the PDF Object Type
+  PDFObject(this.pdfDocument, [String type]) : objser = pdfDocument._genSerial() {
+    if (type != null) {
+      params["/Type"] = PDFStream.string(type);
+    }
+
+    pdfDocument.objects.add(this);
+  }
+
+  /// <p>Writes the object to the output stream.
+  /// This method must be overidden.</p>
+  ///
+  /// <p><b>Note:</b> It should not write any other objects, even if they are
+  /// it's Kids, as they will be written by the calling routine.</p>
+  ///
+  /// @param os OutputStream to send the object to
+  void write(PDFStream os) {
+    prepare();
+    writeStart(os);
+    writeContent(os);
+    writeEnd(os);
+  }
+
+  /// Prepare the object to be written to the stream
+  void prepare() {}
+
+  /// The write method should call this before writing anything to the
+  /// OutputStream. This will send the standard header for each object.
+  ///
+  /// <p>Note: There are a few rare cases where this method is not called.
+  ///
+  /// @param os OutputStream to write to
+  void writeStart(PDFStream os) {
+    os.putString("$objser $objgen obj\n");
+  }
+
+  void writeContent(PDFStream os) {
+    if (params.length > 0) {
+      os.putDictionary(params);
+      os.putString("\n");
+    }
+  }
+
+  /// The write method should call this after writing anything to the
+  /// OutputStream. This will send the standard footer for each object.
+  ///
+  /// <p>Note: There are a few rare cases where this method is not called.
+  ///
+  /// @param os OutputStream to write to
+  void writeEnd(PDFStream os) {
+    os.putString("endobj\n");
+  }
+
+  /// Returns the unique serial number in PDF format
+  /// @return the serial number in PDF format
+  PDFStream ref() => PDFStream.string("$objser $objgen R");
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFObjectStream extends PDFObject {
+  /// This holds the stream's content.
+  final PDFStream buf = new PDFStream();
+
+  /// defines if the stream needs to be converted to ascii85
+  final bool isBinary;
+
+  /// Constructs a stream. The supplied type is stored in the stream's header
+  /// and is used by other objects that extend the PDFStream class (like
+  /// PDFImage).
+  /// <p>By default, the stream will be compressed.
+  /// @param type type for the stream
+  /// @see PDFImage
+  PDFObjectStream(PDFDocument pdfDocument, {String type, this.isBinary = false}) : super(pdfDocument, type);
+
+  Uint8List _data;
+
+  @override
+  void prepare() {
+    super.prepare();
+
+    if (pdfDocument.deflate) {
+      var z = new ZLibCodec(level: ZLibOption.MAX_LEVEL);
+      _data = z.encode(buf.output());
+      params["/Filter"] = PDFStream.string("/FlateDecode");
+    } else if (isBinary) {
+      // This is a Ascii85 stream
+      var e = new Ascii85Encoder();
+      _data = e.convert(buf.output());
+      params["/Filter"] = PDFStream.string("/ASCII85Decode");
+    } else {
+      // This is a non-deflated stream
+      _data = buf.output();
+    }
+    params["/Length"] = PDFStream.intNum(_data.length);
+  }
+
+  @override
+  void writeContent(PDFStream os) {
+    super.writeContent(os);
+
+    os.putString("stream\n");
+    os.putBytes(_data);
+    os.putString("\nendstream\n");
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFOutline extends PDFObject {
+  /// This holds any outlines below us
+  List<PDFOutline> outlines = [];
+
+  /// For subentries, this points to it's parent outline
+  PDFOutline parent;
+
+  /// This is this outlines Title
+  final String title;
+
+  /// The destination page
+  PDFPage dest;
+
+  /// The region on the destination page
+  final double l, b, r, t;
+
+  /// When jumping to the destination, display the whole page
+  static const bool FITPAGE = false;
+
+  /// When jumping to the destination, display the specified region
+  static const bool FITRECT = true;
+
+  /// How the destination is handled
+  bool destMode = FITPAGE;
+
+  /// Constructs a PDF Outline object. When selected, the specified region
+  /// is displayed.
+  ///
+  /// @param title Title of the outline
+  /// @param dest The destination page
+  /// @param l left coordinate
+  /// @param b bottom coordinate
+  /// @param r right coordinate
+  /// @param t top coordinate
+  PDFOutline(PDFDocument pdfDocument, {this.title, this.dest, this.l, this.b, this.r, this.t})
+      : super(pdfDocument, "/Outlines");
+
+  /// This method creates an outline, and attaches it to this one.
+  /// When the outline is selected, the supplied region is displayed.
+  ///
+  /// <p>Note: the coordiates are in Java space. They are converted to User
+  /// space.
+  ///
+  /// <p>This allows you to have an outline for say a Chapter,
+  /// then under the chapter, one for each section. You are not really
+  /// limited on how deep you go, but it's best not to go below say 6 levels,
+  /// for the reader's sake.
+  ///
+  /// @param title Title of the outline
+  /// @param dest The destination page
+  /// @param x coordinate of region in Java space
+  /// @param y coordinate of region in Java space
+  /// @param w width of region in Java space
+  /// @param h height of region in Java space
+  /// @return PDFOutline object created, for creating sub-outlines
+  PDFOutline add({String title, PDFPage dest, double x, y, w, h}) {
+    var xy1 = dest.cxy(x, y + h);
+    var xy2 = dest.cxy(x + w, y);
+    PDFOutline outline = new PDFOutline(pdfDocument, title: title, dest: dest, l: xy1.w, b: xy1.h, r: xy2.w, t: xy2.h);
+    // Tell the outline of ourselves
+    outline.parent = this;
+    return outline;
+  }
+
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    // These are for kids only
+    if (parent != null) {
+      params["/Title"] = PDFStream.string(title);
+      var dests = new List<PDFStream>();
+      dests.add(dest.ref());
+
+      if (destMode == FITPAGE) {
+        dests.add(PDFStream.string("/Fit"));
+      } else {
+        dests.add(PDFStream.string("/FitR $l $b $r $t"));
+      }
+      params["/Parent"] = parent.ref();
+      params["/Dest"] = PDFStream.array(dests);
+
+      // were a decendent, so by default we are closed. Find out how many
+      // entries are below us
+      int c = descendants();
+      if (c > 0) {
+        params["/Count"] = PDFStream.intNum(-c);
+      }
+
+      int index = parent.getIndex(this);
+      if (index > 0) {
+        // Now if were not the first, then we have a /Prev node
+        params["/Prev"] = parent.getNode(index - 1).ref();
+      }
+
+      if (index < parent.getLast()) {
+        // We have a /Next node
+        params["/Next"] = parent.getNode(index + 1).ref();
+      }
+    } else {
+      // the number of outlines in this document
+      // were the top level node, so all are open by default
+      params["/Count"] = PDFStream.intNum(outlines.length);
+    }
+
+    // These only valid if we have children
+    if (outlines.length > 0) {
+      // the number of the first outline in list
+      params["/First"] = outlines[0].ref();
+
+      // the number of the last outline in list
+      params["/Last"] = outlines[outlines.length - 1].ref();
+    }
+  }
+
+  /// This is called by children to find their position in this outlines
+  /// tree.
+  ///
+  /// @param outline PDFOutline to search for
+  /// @return index within Vector
+  int getIndex(PDFOutline outline) => outlines.indexOf(outline);
+
+  /// Returns the last index in this outline
+  /// @return last index in outline
+  int getLast() => outlines.length - 1;
+
+  /// Returns the outline at a specified position.
+  /// @param i index
+  /// @return the node at index i
+  PDFOutline getNode(int i) => outlines[i];
+
+  /// Returns the total number of descendants below this one.
+  /// @return the number of descendants below this one
+  int descendants() {
+    int c = outlines.length; // initially the number of kids
+
+    // now call each one for their descendants
+    for (PDFOutline o in outlines) {
+      c += o.descendants();
+    }
+
+    return c;
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFOutput {
+  /// This is the actual PDFStream used to write to.
+  final PDFStream os;
+
+  /// This vector contains offsets of each object
+  List<PDFXref> offsets = [];
+
+  /// This is used to track the /Root object (catalog)
+  PDFObject rootID;
+
+  /// This is used to track the /Info object (info)
+  PDFObject infoID;
+
+  /// This creates a PDF PDFStream
+  ///
+  /// @param os The output stream to write the PDF file to.
+  PDFOutput(this.os) {
+    os.putString("%PDF-1.4\n");
+    os.putBytes([0x25, 0xC2, 0xA5, 0xC2, 0xB1, 0xC3, 0xAB, 0x0A]);
+  }
+
+  /// This method writes a PDFObject to the stream.
+  ///
+  /// @param ob PDFObject Obeject to write
+  void write(PDFObject ob) {
+    // Check the object to see if it's one that is needed in the trailer
+    // object
+    if (ob is PDFCatalog) rootID = ob;
+    if (ob is PDFInfo) infoID = ob;
+
+    offsets.add(new PDFXref(ob.objser, os.offset));
+    ob.write(os);
+  }
+
+  /// This closes the Stream, writing the xref table
+  void close() {
+    // we use baos to speed things up a little.
+    // Also, offset is preserved, and marks the begining of this block.
+    // This is required by PDF at the end of the PDF file.
+
+    int xref = os.offset;
+
+    os.putString("xref\n");
+
+    // Now a single subsection for object 0
+    //os.write("0 1\n0000000000 65535 f \n");
+
+    // Now scan through the offsets list. The should be in sequence,
+    // but just in case:
+    int firstid = 0; // First id in block
+    int lastid = -1; // The last id used
+    var block = []; // xrefs in this block
+
+    // We need block 0 to exist
+    block.add(new PDFXref(0, 0, generation: 65535));
+
+    for (PDFXref x in offsets) {
+      if (firstid == -1) firstid = x.id;
+
+      // check to see if block is in range (-1 means empty)
+      if (lastid > -1 && x.id != (lastid + 1)) {
+        // no, so write this block, and reset
+        writeblock(firstid, block);
+        block = [];
+        firstid = -1;
+      }
+
+      // now add to block
+      block.add(x);
+      lastid = x.id;
+    }
+
+    // now write the last block
+    if (firstid > -1) writeblock(firstid, block);
+
+    // now the trailer object
+    os.putString("trailer\n<<\n");
+
+    // the number of entries (REQUIRED)
+    os.putString("/Size ");
+    os.putString((offsets.length + 1).toString());
+    os.putString("\n");
+
+    // the /Root catalog indirect reference (REQUIRED)
+    if (rootID != null) {
+      os.putString("/Root ");
+      os.putStream(rootID.ref());
+      os.putString("\n");
+    } else
+      throw new Exception("Root object is not present in document");
+
+    // the /Info reference (OPTIONAL)
+    if (infoID != null) {
+      os.putString("/Info ");
+      os.putStream(infoID.ref());
+      os.putString("\n");
+    }
+
+    // end the trailer object
+    os.putString(">>\nstartxref\n$xref\n%%EOF\n");
+  }
+
+  /// Writes a block of references to the PDF file
+  /// @param firstid ID of the first reference in this block
+  /// @param block Vector containing the references in this block
+  void writeblock(int firstid, var block) {
+    os.putString("$firstid ${block.length}\n");
+    //os.write("\n0000000000 65535 f\n");
+
+    for (PDFXref x in block) {
+      os.putString(x.ref());
+      os.putString("\n");
+    }
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFPage extends PDFObject {
+  /// This is this page format, ie the size of the page, margins, and rotation
+  PDFPageFormat pageFormat;
+
+  /// This holds the contents of the page.
+  List<PDFObjectStream> contents = [];
+
+  /// Object ID that contains a thumbnail sketch of the page.
+  /// -1 indicates no thumbnail.
+  PDFObject thumbnail;
+
+  /// This holds any Annotations contained within this page.
+  List<PDFAnnot> annotations = [];
+
+  /// The fonts associated with this page
+  final fonts = new Map<String, PDFFont>();
+
+  /// The xobjects or other images in the pdf
+  final xObjects = new Map<String, PDFXObject>();
+
+  /// This constructs a Page object, which will hold any contents for this
+  /// page.
+  ///
+  /// <p>Once created, it is added to the document via the PDF.add() method.
+  ///
+  /// @param orientation Orientation: 0, 90 or 270
+  /// @see PageFormat#PORTRAIT
+  /// @see PageFormat#LANDSCAPE
+  /// @see PageFormat#REVERSE_LANDSCAPE
+  /// @param pageFormat PageFormat describing the page size
+  PDFPage(PDFDocument pdfDocument, {int orientation, this.pageFormat}) : super(pdfDocument, "/Page") {
+    pdfDocument.pdfPageList.pages.add(this);
+    if (pageFormat == null) pageFormat = new PDFPageFormat();
+    setOrientation(orientation);
+  }
+
+  /// This returns a PDFGraphics object, which can then be used to render
+  /// on to this page. If a previous PDFGraphics object was used, this object
+  /// is appended to the page, and will be drawn over the top of any previous
+  /// objects.
+  ///
+  /// @return a new PDFGraphics object to be used to draw this page.
+  PDFGraphics getGraphics() {
+    var stream = new PDFObjectStream(pdfDocument);
+    var g = new PDFGraphics(this, stream.buf);
+    contents.add(stream);
+    return g;
+  }
+
+  /// Returns the page's PageFormat.
+  /// @return PageFormat describing the page size in device units (72dpi)
+  PDFPageFormat getPageFormat() {
+    return pageFormat;
+  }
+
+  /// Gets the dimensions of the page.
+  /// @return a Dimension object containing the width and height of the page.
+  PDFPoint getDimension() => new PDFPoint(pageFormat.getWidth(), pageFormat.getHeight());
+
+  /// Sets the page's orientation.
+  ///
+  /// <p>Normally, this should be done when the page is created, to avoid
+  /// problems.
+  ///
+  /// @param orientation a PageFormat orientation constant:
+  /// PageFormat.PORTRAIT, PageFormat.LANDSACPE or PageFromat.REVERSE_LANDSACPE
+  void setOrientation(int orientation) {
+    pageFormat.setOrientation(orientation);
+  }
+
+  /// Returns the pages orientation:
+  /// PageFormat.PORTRAIT, PageFormat.LANDSACPE or PageFromat.REVERSE_LANDSACPE
+  ///
+  /// @see java.awt.print.PageFormat
+  /// @return current orientation of the page
+  int getOrientation() => pageFormat.getOrientation();
+
+  /// This adds an Annotation to the page.
+  ///
+  /// <p>As with other objects, the annotation must be added to the pdf
+  /// document using PDF.add() before adding to the page.
+  ///
+  /// @param ob Annotation to add.
+  void addAnnotation(PDFObject ob) {
+    annotations.add(ob);
+  }
+
+  /// This method adds a text note to the document.
+  /// @param note Text of the note
+  /// @param x Coordinate of note
+  /// @param y Coordinate of note
+  /// @param w Width of the note
+  /// @param h Height of the note
+  /// @return Returns the annotation, so other settings can be changed.
+  PDFAnnot addNote(String note, double x, y, w, h) {
+    var xy1 = cxy(x, y + h);
+    var xy2 = cxy(x + w, y);
+    PDFAnnot ob = new PDFAnnot.text(this, xy1.w, xy1.h, xy2.w, xy2.h, note);
+    return ob;
+  }
+
+  /// Adds a hyperlink to the document.
+  /// @param x Coordinate of active area
+  /// @param y Coordinate of active area
+  /// @param w Width of the active area
+  /// @param h Height of the active area
+  /// @param dest Page that will be displayed when the link is activated. When
+  /// displayed, the zoom factor will be changed to fit the display.
+  /// @param vx Coordinate of view area
+  /// @param vy Coordinate of view area
+  /// @param vw Width of the view area
+  /// @param vh Height of the view area
+  /// @return Returns the annotation, so other settings can be changed.
+  PDFAnnot addLink(double x, y, w, h, PDFObject dest,
+      [double vx = PDFAnnot.FULL_PAGE, vy = PDFAnnot.FULL_PAGE, vw = PDFAnnot.FULL_PAGE, vh = PDFAnnot.FULL_PAGE]) {
+    var xy1 = cxy(x, y + h);
+    var xy2 = cxy(x + w, y);
+    var xy3 = cxy(vx, vy + vh);
+    var xy4 = cxy(vx + vw, vy);
+    PDFAnnot ob = new PDFAnnot.link(this, xy1.w, xy1.h, xy2.w, xy2.h, dest, xy3.w, xy3.h, xy4.w, xy4.h);
+    return ob;
+  }
+
+  /// This method attaches an outline to the current page being generated. When
+  /// selected, the outline displays the top of the page.
+  /// @param title Outline title to attach
+  /// @param x Left coordinate of region
+  /// @param y Bottom coordinate of region
+  /// @param w Width of region
+  /// @param h Height coordinate of region
+  /// @return PDFOutline object created, for addSubOutline if required.
+  PDFOutline addOutline(String title, {double x, double y, double w, double h}) {
+    PDFPoint xy1 = cxy(x, y + h);
+    PDFPoint xy2 = cxy(x + w, y);
+    PDFOutline outline = new PDFOutline(pdfDocument, title: title, dest: this, l: xy1.w, b: xy1.h, r: xy2.w, t: xy2.h);
+    pdfDocument.outline.outlines.add(outline);
+    return outline;
+  }
+
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    // the /Parent pages object
+    params["/Parent"] = pdfDocument.pdfPageList.ref();
+
+    // the /MediaBox for the page size
+    params["/MediaBox"] = new PDFStream()..putStringArray([0, 0, pageFormat.getWidth(), pageFormat.getHeight()]);
+
+    // Rotation (if not zero)
+//        if(rotate!=0) {
+//            os.write("/Rotate ");
+//            os.write(Integer.toString(rotate).getBytes());
+//            os.write("\n");
+//        }
+
+    // the /Contents pages object
+    if (contents.length > 0) {
+      if (contents.length == 1) {
+        params["/Contents"] = contents[0].ref();
+      } else {
+        params["/Contents"] = new PDFStream()..putObjectArray(contents);
+      }
+    }
+
+    // Now the resources
+    /// This holds any resources for this page
+    final resources = new Map<String, PDFStream>();
+
+    // fonts
+    if (fonts.length > 0) {
+      resources["/Font"] = new PDFStream()..putObjectDictionary(fonts);
+    }
+
+    // Now the XObjects
+    if (xObjects.length > 0) {
+      resources["/XObject"] = new PDFStream()..putObjectDictionary(xObjects);
+    }
+
+    params["/Resources"] = PDFStream.dictionary(resources);
+
+    // The thumbnail
+    if (thumbnail != null) {
+      params["/Thumb"] = thumbnail.ref();
+    }
+
+    // The /Annots object
+    if (annotations.length > 0) {
+      params["/Annots"] = new PDFStream()..putObjectArray(annotations);
+    }
+  }
+
+  /// This utility method converts the y coordinate from Java to User space
+  /// within the page.
+  /// @param x Coordinate in Java space
+  /// @param y Coordinate in Java space
+  /// @return y Coordinate in User space
+  double cy(double x, double y) => cxy(x, y).h;
+
+  /// This utility method converts the y coordinate from Java to User space
+  /// within the page.
+  /// @param x Coordinate in Java space
+  /// @param y Coordinate in Java space
+  /// @return x Coordinate in User space
+  double cx(double x, double y) => cxy(x, y).w;
+
+  /// This utility method converts the Java coordinates to User space
+  /// within the page.
+  /// @param x Coordinate in Java space
+  /// @param y Coordinate in Java space
+  /// @return array containing the x & y Coordinate in User space
+  PDFPoint cxy(double x, double y) => new PDFPoint(x, pageFormat.getHeight() - y);
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFPageFormat {
+  static const A4 = const [595.28, 841.89];
+  static const A3 = const [841.89, 1190.55];
+  static const A5 = const [420.94, 595.28];
+  static const LETTER = const [612.0, 792.0];
+  static const LEGAL = const [612.0, 1008.0];
+
+  static const PT = 1.0;
+  static const IN = 72.0;
+  static const CM = IN / 2.54;
+  static const MM = IN / 25.4;
+
+  double width;
+  double height;
+  double imageableX = 10.0;
+  double imageableY = 10.0;
+  double imageableWidth = 300.0;
+  double imageableHeight = 300.0;
+  int orientation = 0;
+
+  PDFPageFormat([List<double> format]) {
+    if (format == null || format.length != 2) format = A4;
+
+    width = format[0];
+    height = format[1];
+  }
+
+  double getWidth() => width;
+  double getHeight() => height;
+
+  void setOrientation(int orientation) {
+    this.orientation = orientation;
+  }
+
+  int getOrientation() => orientation;
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFPageList extends PDFObject {
+  /// This holds the pages
+  final List<PDFPage> pages = [];
+
+  /// This constructs a PDF Pages object.
+  PDFPageList(PDFDocument pdfDocument) : super(pdfDocument, "/Pages");
+
+  /// This returns a specific page. Used by the PDF class.
+  /// @param page page number to return
+  /// @return PDFPage at that position
+  PDFPage getPage(int page) => pages[page];
+
+  /// @param os OutputStream to send the object to
+  @override
+  void prepare() {
+    super.prepare();
+
+    params["/Kids"] = new PDFStream()..putObjectArray(pages);
+    params["/Count"] = PDFStream.intNum(pages.length);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFPoint {
+  final double w, h;
+  const PDFPoint(this.w, this.h);
+
+  @override
+  String toString() => "PDFPoint($w, $h)";
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class Polygon {
+  List<PDFPoint> points;
+
+  Polygon(this.points);
+
+  PDFRect getBounds() {
+    // TODO: Implement properly
+    return const PDFRect(0.0, 0.0, 0.0, 0.0);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFRect {
+  final double x, y, w, h;
+  const PDFRect(this.x, this.y, this.w, this.h);
+
+  @override
+  String toString() => "PDFRect($x, $y, $w, $h)";
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFStream {
+  final _stream = new BytesBuilder(copy: false);
+
+  void putStream(PDFStream s) {
+    _stream.add(s._stream.toBytes());
+  }
+
+  void putString(String s) {
+    for (int codeUnit in s.codeUnits) {
+      if (codeUnit <= 0x7f) {
+        _stream.addByte(codeUnit);
+      } else {
+        _stream.addByte(0x20);
+      }
+    }
+  }
+
+  static PDFStream string(String s) => new PDFStream()..putString(s);
+
+  void putStringUtf16(String s) {
+    for (int codeUnit in s.codeUnits) {
+      _stream.addByte(codeUnit & 0xff);
+      _stream.addByte((codeUnit >> 8) & 0xff);
+    }
+  }
+
+  void putBytes(List<int> s) {
+    _stream.add(s);
+  }
+
+  void putNum(double d) {
+    putString(d.toString());
+  }
+
+  static PDFStream num(double d) => new PDFStream()..putNum(d);
+  static PDFStream intNum(int i) => new PDFStream()..putString(i.toString());
+
+  void putText(String s) {
+    // Escape special characters
+    //    \n Line feed (LF)
+    //    \r Carriage return (CR)
+    //    \t Horizontal tab (HT)
+    //    \b Backspace (BS)
+    //    \f Form feed (FF)
+    //    \( Left parenthesis
+    //    \) Right parenthesis
+    //    \\ Backslash
+    //    \ddd Character code ddd (octal)
+    s = s
+        .replaceAll('\\', '\\\\')
+        .replaceAll('(', '\\(')
+        .replaceAll(')', '\\)')
+        .replaceAll('\n', '\\n')
+        .replaceAll('\t', '\\t')
+        .replaceAll('\b', '\\b')
+        .replaceAll('\f', '\\f')
+        .replaceAll('\r', '\\r');
+
+    putBytes(LATIN1.encode('(' + s + ')'));
+  }
+
+  static PDFStream text(String s) => new PDFStream()..putText(s);
+
+  void putBool(bool value) {
+    putString(value ? "true" : "false");
+  }
+
+  void putArray(List<PDFStream> values) {
+    putString("[");
+    for (var val in values) {
+      putStream(val);
+      putString(" ");
+    }
+    putString("]");
+  }
+
+  void putObjectArray(List<PDFObject> values) {
+    putString("[");
+    for (var val in values) {
+      putStream(val.ref());
+      putString(" ");
+    }
+    putString("]");
+  }
+
+  void putStringArray(List<dynamic> values) {
+    putString("[" + values.join(" ") + "]");
+  }
+
+  static PDFStream array(List<PDFStream> values) => new PDFStream()..putArray(values);
+
+  void putDictionary(Map<String, PDFStream> values) {
+    putString("<< ");
+    values.forEach((k, v) {
+      putString("$k ");
+      putStream(v);
+      putString("\n");
+    });
+    putString(">>");
+  }
+
+  static PDFStream dictionary(Map<String, PDFStream> values) => new PDFStream()..putDictionary(values);
+
+  void putObjectDictionary(Map<String, PDFObject> values) {
+    putString("<< ");
+    values.forEach((k, v) {
+      putString("$k ");
+      putStream(v.ref());
+      putString(" ");
+    });
+    putString(">>");
+  }
+
+  int get offset => _stream.length;
+
+  Uint8List output() => _stream.toBytes();
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General 
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General 
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFTTFFont extends PDFFont {
+  PDFObject unicodeCMap;
+  PDFFontDescriptor descriptor;
+  PDFArrayObject widthsObject;
+  final widths = new List<String>();
+  TtfFont _font;
+  int _charMin;
+  int _charMax;
+
+  /// Constructs a PDFTTFFont
+  PDFTTFFont(PDFDocument pdfDocument, Uint8List bytes) : super(pdfDocument, subtype: "/TrueType") {
+    _font = new TtfParser().parse(bytes);
+    baseFont = "/" + _font.name.fontName.replaceAll(" ", "");
+
+    PDFObjectStream file = new PDFObjectStream(pdfDocument, isBinary: true);
+    file.buf.putBytes(bytes);
+    file.params["/Length1"] = PDFStream.intNum(bytes.length);
+
+    _charMin = 32;
+    _charMax = 255;
+
+    for (var i = _charMin; i <= _charMax; i++) {
+      widths.add((glyphAdvance(i) * 1000.0).toString());
+    }
+
+    unicodeCMap = new PDFObject(pdfDocument);
+    descriptor = new PDFFontDescriptor(this, file, _font);
+    widthsObject = new PDFArrayObject(pdfDocument, widths);
+  }
+
+  @override
+  double glyphAdvance(int charCode) {
+    var g = _font.cmap.charToGlyphIndexMap[charCode];
+
+    if (g == null) {
+      return super.glyphAdvance(charCode);
+    }
+
+    return _font.hmtx.metrics[g].advanceWidth / _font.head.unitsPerEm;
+  }
+
+  @override
+  PDFRect glyphBounds(int charCode) {
+    var g = _font.cmap.charToGlyphIndexMap[charCode];
+
+    if (g == null) {
+      return super.glyphBounds(charCode);
+    }
+
+    var info = _font.glyf.glyphInfoMap[g];
+    return new PDFRect(
+        info.xMin.toDouble() / _font.head.unitsPerEm,
+        info.yMin.toDouble() / _font.head.unitsPerEm,
+        (info.xMax - info.xMin).toDouble() / _font.head.unitsPerEm,
+        (info.yMax - info.yMin).toDouble() / _font.head.unitsPerEm);
+  }
+
+  @override
+  void prepare() {
+    super.prepare();
+
+    params["/FirstChar"] = PDFStream.intNum(_charMin);
+    params["/LastChar"] = PDFStream.intNum(_charMax);
+    params["/Widths"] = widthsObject.ref();
+    params["/FontDescriptor"] = descriptor.ref();
+//    params["/Encoding"] = PDFStream.string("/Identity-H");
+//    params["/ToUnicode"] = unicodeCMap.ref();
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFXObject extends PDFObjectStream {
+  PDFXObject(PDFDocument pdfDocument, String subtype, {bool isBinary = false})
+      : super(pdfDocument, type: '/XObject', isBinary: isBinary) {
+    params['/Subtype'] = PDFStream.string(subtype);
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) 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
+ * Lesser General  License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+part of pdf;
+
+class PDFXref {
+  /// The id of a PDF Object
+  int id;
+
+  /// The offset within the PDF file
+  int offset;
+
+  /// The generation of the object, usually 0
+  int generation = 0;
+
+  /// Creates a crossreference for a PDF Object
+  /// @param id The object's ID
+  /// @param offset The object's position in the file
+  /// @param generation The object's generation, usually 0
+  PDFXref(this.id, this.offset, {this.generation = 0});
+
+  /// @return The xref in the format of the xref section in the PDF file
+  String ref() {
+    String rs = offset.toString().padLeft(10, '0') + " " + generation.toString().padLeft(5, '0');
+
+    if (generation == 65535) return rs + " f ";
+    return rs + " n ";
+  }
+}

+name: pdf
+author: David PHAM-VAN <dev.nfet.net@gmail.com>
+description: A pdf producer for Dart
+homepage: https://github.com/davbfr/dart_pdf
+version: 1.0.0
+
+dependencies:
+  image: "^1.1.29"
+  ttf_parser: "^1.0.0"
+  vector_math:
+
+dev_dependencies:
+  test: "^0.12.32+1"

+import 'dart:io';
+
+import 'package:pdf/pdf.dart';
+import "package:test/test.dart";
+
+void main() {
+  test('Pdf1', () {
+    var pdf = new PDFDocument(deflate: false);
+    var page = new PDFPage(pdf, pageFormat: new PDFPageFormat(PDFPageFormat.A4));
+
+    var g = page.getGraphics();
+    g.drawLine(30.0, 30.0, 200.0, 200.0);
+    g.strokePath();
+
+    var file = new File('file1.pdf');
+    file.writeAsBytesSync(pdf.save());
+  });
+}

+import 'dart:io';
+import 'dart:math';
+
+import 'package:image/image.dart';
+import 'package:pdf/pdf.dart';
+import 'package:test/test.dart';
+import 'package:vector_math/vector_math_64.dart';
+
+
+void main() {
+  test('Pdf', () {
+    Image img = new Image(10, 10);
+    img.fill(0x12345678);
+
+    var pdf = new PDFDocument(deflate: false);
+    var i = pdf.info;
+    i.author = "David PHAM-VAN";
+    i.creator = i.author;
+    i.title = "My Title";
+    i.subject = "My Subject";
+    var page = new PDFPage(pdf, pageFormat: new PDFPageFormat([500.0, 300.0]));
+
+    var g = page.getGraphics();
+    g.saveContext();
+    var tm = new Matrix4.identity();
+    tm.translate(100.0, 700.0);
+    g.setTransform(tm);
+//  g.drawShape("M37 0H9C6.24 0 4 2.24 4 5v38c0 2.76 2.24 5 5 5h28c2.76 0 5-2.24 5-5V5c0-2.76-2.24-5-5-5zM23 46c-1.66 0-3-1.34-3-3s1.34-3 3-3 3 1.34 3 3-1.34 3-3 3zm15-8H8V6h30v32z");
+    g.restoreContext();
+    var font1 = new PDFFont(pdf);
+
+    var font2 = new PDFTTFFont(pdf, new File("../assets/Nunito-Regular.ttf").readAsBytesSync());
+    var s = "Hello World!";
+    var r = font2.stringBounds(s);
+    const FS = 20.0;
+    g.setColor(new PDFColor(0.0, 1.0, 1.0));
+    g.drawRect(50.0 + r.x * FS, 30.0 + r.y * FS, r.w * FS, r.h * FS);
+    g.fillPath();
+    g.setColor(new PDFColor(0.3, 0.3, 0.3));
+    g.drawString(font2, FS, s, 50.0, 30.0);
+
+    g.setColor(new PDFColor(1.0, 0.0, 0.0));
+    g.drawString(font2, 20.0, "Hé (Olà)", 50.0, 10.0);
+    g.drawLine(30.0, 30.0, 200.0, 200.0);
+    g.strokePath();
+    g.setColor(new PDFColor(1.0, 0.0, 0.0));
+    g.drawRect(300.0, 150.0, 50.0, 50.0);
+    g.fillPath();
+    g.setColor(new PDFColor(0.0, 0.5, 0.0));
+    var image = new PDFImage(pdf, img);
+    for (var i = 10.0; i < 90.0; i += 5.0) {
+      g.saveContext();
+      var tm = new Matrix4.identity();
+      tm.rotateZ(i * PI / 360.0);
+      tm.translate(300.0, -100.0);
+      g.setTransform(tm);
+      g.drawString(font1, 12.0, "Hello $i", 20.0, 100.0);
+      g.drawImage(image, 100.0, 100.0, 80.0);
+      g.restoreContext();
+    }
+
+    var file = new File('file.pdf');
+    file.writeAsBytesSync(pdf.save());
+  });
+}