Initial data commit

Task/Animation/Dart/animation-1.dart

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+import 'package:flutter/material.dart';
+import 'dart:async' show Timer;
+
+void main() {
+
+  var timer = const Duration( milliseconds: 75 ); // How often to update i.e. how fast the animation is
+
+  runApp(MaterialApp (
+    home: Scaffold (
+      body: Center (
+        child: AnimatedText( timer )
+      )
+    )
+  ));
+}
+
+class AnimatedText extends StatefulWidget {
+
+  final Duration period; // Time period for update
+
+  AnimatedText( this.period );
+  @override
+  _AnimatedText createState() => _AnimatedText( period );
+}
+
+
+class _AnimatedText extends State<AnimatedText> {
+
+  bool forward = true; // Text should go forward?
+
+  Timer timer; // Timer Objects allow us to do things based on a period of time
+  // We want to get an array of characters, but Dart does not have a char type
+  // Below is the equivalent code
+  var _text =  'Hello World!      '.runes // .runes gives us the unicode number of each character
+    .map( (code) => String.fromCharCode(code) ) // Map all these codes to Strings containing the single character
+    .toList(); // Conver to a List
+
+  _AnimatedText( Duration period ){
+    timer = Timer.periodic( period , (_){
+      setState((){ // Set state forces the gui elements to be redrawn
+        shiftText();
+
+      });
+    });
+  }
+
+  String get text => _text.join(''); // Getter, joins the list of chars into a string
+
+  void shiftText() {
+    if (forward) { // If we should go forward
+      var last = _text.removeLast(); // Remove the last char
+
+      _text.insert( 0, last); // Insert it at the front
+
+    } else { // If we should go backward
+      var first = _text.removeAt(0); // Remove the first char
+
+      _text.insert( _text.length, first ); // Insert it at the end
+    }
+
+ }
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector( // GestureDetector lets us capture events
+      onTap: () => forward = !forward, // on Tap (Click in browser) invert the forward bool
+      child: Text(
+        text, // Call the text getter to get the shifted string
+        style: TextStyle( // Styling
+          fontSize: 50,
+          color: Colors.grey[600]
+        )
+      )
+
+    );
+  }
+
+}

Task/Animation/Dart/animation-2.dart

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+import 'dart:html';
+import 'dart:async';
+
+const frameTime = const Duration(milliseconds: 100);
+
+void main() {
+  String text = "Hello World! ";
+  bool rotateRight = true;
+
+  Element writeHere =
+      querySelector('#output'); // assumes you have a pre with that ID
+  writeHere.onClick.listen((event) => rotateRight = !rotateRight);
+
+  new Timer.periodic(frameTime, (_) {
+    text = changeText(text, rotateRight);
+    writeHere.text = text;
+  });
+}
+
+String changeText(extt, rotateRight) {
+  if (rotateRight) {
+    return extt.substring(extt.length - 1) + extt.substring(0, extt.length - 1);
+  } else {
+    return extt.substring(1) + extt.substring(0, 1);
+  }
+}