Update Readme with more examples

+# 1.3.11
+* Update Readme
+
 # 1.3.10
 * Deprecate the document argument in Printing.sharePdf()
 * Add default value to alpha in PdfColor variants

@@ -10,8 +10,8 @@ images and text using TrueType fonts. With the ease of use you already know.
 
 <img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/pdf/example.jpg">
 
-> Use the `printing` package <https://pub.dartlang.org/packages/printing>
-> for full flutter print and share operation.
+Use the `printing` package <https://pub.dartlang.org/packages/printing>
+for full flutter print and share operation.
 
 The coordinate system is using the internal Pdf unit:
  * 1.0 is defined as 1 / 72.0 inch
@@ -19,8 +19,9 @@ The coordinate system is using the internal Pdf unit:
 
 Example:
 ```dart
-final pdf = Document()
-  ..addPage(Page(
+final pdf = Document();
+
+pdf.addPage(Page(
       pageFormat: PdfPageFormat.a4,
       build: (Context context) {
         return Center(
@@ -32,30 +33,43 @@ final pdf = Document()
 To load an image it is possible to use the dart library [image](https://pub.dartlang.org/packages/image):
 
 ```dart
-Image image = decodeImage(Io.File('test.webp').readAsBytesSync());
-PdfImage image = PdfImage(
-  pdf,
+final img = decodeImage(File('test.webp').readAsBytesSync());
+final image = PdfImage(
+  pdf.document,
 	image: img.data.buffer.asUint8List(),
 	width: img.width,
-	height: img.height);
-g.drawImage(image, 100.0, 100.0, 80.0);
+	height: img.height,
+);
+
+pdf.addPage(Page(
+    build: (Context context) {
+      return Center(
+        child: Image(image),
+      ); // Center
+    })); // Page
 ```
 
 To use a TrueType font:
 
 ```dart
-PdfTtfFont ttf = PdfTtfFont(
-  pdf,
-  (File("open-sans.ttf").readAsBytesSync() as Uint8List).buffer.asByteData());
-g.setColor(PdfColor(0.3, 0.3, 0.3));
-g.drawString(ttf, 20.0, "Dart is awesome", 50.0, 30.0);
+final Uint8List fontData = File('open-sans.ttf').readAsBytesSync();
+final ttf = Font.ttf(fontData.buffer.asByteData());
+
+pdf.addPage(Page(
+    pageFormat: PdfPageFormat.a4,
+    build: (Context context) {
+      return Center(
+        child: Text('Hello World', style: TextStyle(font: ttf, fontSize: 40)),
+      ); // Center
+    })); // Page
 ```
 
-To save the image on Flutter, use the [path_provider](https://pub.dartlang.org/packages/path_provider) library:
+To save the pdf file:
 
 ```dart
-Directory tempDir = await getTemporaryDirectory();
-String tempPath = tempDir.path;
-var file = File("$tempPath/file.pdf");
+// On Flutter, use the [path_provider](https://pub.dartlang.org/packages/path_provider) library:
+//   final output = await getTemporaryDirectory();
+//   final file = File("${output.path}/example.pdf");
+final file = File("example.pdf");
 await file.writeAsBytes(pdf.save());
 ```

@@ -4,7 +4,7 @@ description: A pdf producer for Dart. It can create pdf files for both web or fl
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/pdf
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 1.3.10
+version: 1.3.11
 
 environment:
   sdk: ">=2.1.0 <3.0.0"

+# 2.0.4
+* Update Readme
+
 # 2.0.3
 * Add file save and view to example application
 * Convert print screen example to Widgets

@@ -7,32 +7,71 @@ See the example on how to use the plugin.
 
 <img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/printing/example.png" width="300">
 
-> This plugin uses the `pdf` package <https://pub.dartlang.org/packages/pdf>
-> for pdf creation. Please refer to <https://pub.dartlang.org/documentation/pdf/latest/>
-> for documentation.
+This plugin uses the `pdf` package <https://pub.dartlang.org/packages/pdf>
+for pdf creation. Please refer to <https://pub.dartlang.org/documentation/pdf/latest/>
+for documentation.
 
-To load an image it is possible to use
-[Image.toByteData](https://docs.flutter.io/flutter/dart-ui/Image/toByteData.html):
+Example:
 
 ```dart
-var Image im;
-var bytes = await im.toByteData(format: ui.ImageByteFormat.rawRgba);
-
-PdfImage image = PdfImage(
-    pdf,
-    image: bytes.buffer.asUint8List(), 
-    width: im.width, 
-    height: im.height);
-g.drawImage(image, 100.0, 100.0, 80.0);
+final pdf = PdfDoc();
+
+pdf.addPage(Page(
+      pageFormat: PdfPageFormat.a4,
+      build: (Context context) {
+        return Center(
+          child: Text("Hello World"),
+        ); // Center
+      })); // Page
+```
+
+To load an image from an ImageProvider:
+
+```dart
+const imageProvider = const AssetImage('assets/image.png');
+final PdfImage image = await pdfImageFromImageProvider(pdf: pdf.document, image: imageProvider);
+
+pdf.addPage(Page(
+    build: (Context context) {
+      return Center(
+        child: Image(image),
+      ); // Center
+    })); // Page
 ```
 
 To use a TrueType font from a flutter bundle:
 
 ```dart
-var font = await rootBundle.load("assets/open-sans.ttf");
-PdfTtfFont ttf = PdfTtfFont(pdf, font);
-g.setColor(PdfColor(0.3, 0.3, 0.3));
-g.drawString(ttf, 20.0, "Dart is awesome", 50.0, 30.0);
+final font = await rootBundle.load("assets/open-sans.ttf");
+final ttf = Font.ttf(font);
+
+pdf.addPage(Page(
+    build: (Context context) {
+      return Center(
+        child: Text('Dart is awesome', style: TextStyle(font: ttf, fontSize: 40)),
+      ); // Center
+    })); // Page
+```
+
+To save the pdf file using the [path_provider](https://pub.dartlang.org/packages/path_provider) library:
+
+```dart
+final output = await getTemporaryDirectory();
+final file = File("${output.path}/example.pdf");
+await file.writeAsBytes(pdf.save());
+```
+
+You can also print the document using the iOS or Android print service:
+
+```dart
+await Printing.layoutPdf(
+      onLayout: (PdfPageFormat format) async => pdf.save());
+```
+
+Or share the document to other applications:
+
+```dart
+await Printing.sharePdf(bytes: pdf.save(), filename: 'my-document.pdf');
 ```
 
 ## Installing

@@ -4,7 +4,7 @@ description: Plugin that allows Flutter apps to generate and print documents to
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/printing
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 2.0.3
+version: 2.0.4
 
 environment:
   sdk: ">=2.1.0 <3.0.0"

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'dart:io';
+
+import 'package:markdown/markdown.dart' as md;
+
+Iterable<String> getCode(List<md.Node> nodes, [bool isCode = false]) sync* {
+  for (md.Node node in nodes) {
+    if (node is md.Element) {
+      // print(node.tag);
+      // print(node.attributes);
+      yield* getCode(node.children,
+          node.tag == 'code' && node.attributes['class'] == 'language-dart');
+    } else if (node is md.Text) {
+      if (isCode) {
+        yield '// ------------';
+        yield node.text;
+      }
+    } else {
+      print(node);
+    }
+  }
+}
+
+void main() {
+  final md.Document document = md.Document(
+    extensionSet: md.ExtensionSet.commonMark,
+    encodeHtml: false,
+  );
+
+  final output = File('readme.dart');
+  final st = output.openWrite();
+  st.writeln('import \'dart:io\';');
+  st.writeln('import \'dart:typed_data\';');
+  st.writeln('import \'package:pdf/pdf.dart\';');
+  st.writeln('import \'package:pdf/widgets.dart\';');
+  st.writeln('import \'package:image/image.dart\' show decodeImage;');
+  st.writeln('import \'package:printing/printing.dart\';');
+  st.writeln('import \'package:flutter/services.dart\' show rootBundle;');
+  st.writeln('import \'package:flutter/widgets.dart\' show AssetImage;');
+  st.writeln('import \'package:path_provider/path_provider.dart\';');
+
+  {
+    final data = File('../pdf/README.md').readAsStringSync();
+    final List<String> lines = data.replaceAll('\r\n', '\n').split('\n');
+    final List<md.Node> parsedLines = document.parseLines(lines);
+    final Iterable<String> code = getCode(parsedLines);
+
+    st.writeln('Future pdfReadme() async {');
+    st.writeln(code.join('\n'));
+    st.writeln('}');
+  }
+  {
+    final data = File('../printing/README.md').readAsStringSync();
+    final List<String> lines = data.replaceAll('\r\n', '\n').split('\n');
+    final List<md.Node> parsedLines = document.parseLines(lines);
+    final Iterable<String> code = getCode(parsedLines);
+
+    st.writeln('Future printingReadme() async {');
+    st.writeln(code.join('\n'));
+    st.writeln('}');
+  }
+  st.writeln('Future main() async {');
+  st.writeln('await pdfReadme();');
+  st.writeln('await printingReadme();');
+  st.writeln('}');
+  st.close();
+}

+name: readme_to_dart
+author: David PHAM-VAN <dev.nfet.net@gmail.com>
+description: Readme Markdown to dart source converter.
+homepage: https://github.com/DavBfr/dart_pdf/tree/master/test
+repository: https://github.com/DavBfr/dart_pdf
+issue_tracker: https://github.com/DavBfr/dart_pdf/issues
+version: 1.0.0
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+
+dependencies:  
+  pdf:
+  printing:
+  markdown:
+  meta: 
+  string_scanner: 
+  path: 
+  image:
+  path_provider: