Add All the files from the touchpad_demonstrator Flutter App which can be build for Android and iOS

shape/finger.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'finger_painter.dart';
+class Finger extends StatefulWidget {
+  @override
+  _FingerState createState() => _FingerState();
+}
+
+class _FingerState extends State<Finger> with SingleTickerProviderStateMixin {
+  double _fraction = 0.0;
+  Animation<double> animation;
+  int animationDuration = 10000;
+
+  @override
+  void initState() {
+    super.initState();
+    var controller = AnimationController(
+      duration: Duration(milliseconds: animationDuration), vsync: this);
+    animation = Tween(begin: 0.0, end: 1.0).animate(controller)
+      ..addListener((){
+        setState(() {
+          //print(animation.value);
+          _fraction = animation.value;
+        });
+        print(animation.value);
+      });
+    controller.forward();
+  }
+
+
+
+  @override
+  Widget build(BuildContext context) {
+    return CustomPaint(painter: FingerPainter(_fraction));
+  }
+}

shape/finger_painter.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+
+class FingerPainter extends CustomPainter {
+  Paint _paint;
+  double _fraction;
+
+  FingerPainter(this._fraction) {
+    _paint = Paint()
+      ..color = Colors.blue
+      ..strokeWidth = 10.0
+      ..strokeCap = StrokeCap.round;
+  }
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    print('paint $_fraction');
+    canvas.drawLine(Offset(0.0, 0.0),
+        Offset(size.width * _fraction, size.height * _fraction), _paint);
+    canvas.drawLine(Offset(size.width, 0.0),
+        Offset(size.width - size.width * _fraction, size.height * _fraction), _paint);
+  }
+
+  @override
+  bool shouldRepaint(FingerPainter oldDelegate) {
+    return oldDelegate._fraction != _fraction;
+  }
+}