Indy9000

...
children: <Widget>[
  _buildMyWidget1(),
  _buildMyWidget2(),
  // const MyWidget1(),
  // const MyWidget2(),
  Text(
    'You have pushed the button this many times:',
  ),
  Text(

Indy9000

...

children: <Widget>[
  // _buildMyWidget1(),
  // _buildMyWidget2(),
  const MyWidget1(),
  MyWidget2(),
  Text(
    'You have pushed the button this many times:',
  ),

Indy9000

...

children: <Widget>[
  _buildMyWidget1(),
  _buildMyWidget2(),
  // MyWidget1(),
  // MyWidget2(),
  Text(
    'You have pushed the button this many times:',
  ),

Indy9000

class MyWidget2 extends StatefulWidget {
  const MyWidget2({Key? key}) : super(key: key);

  @override
  _MyWidget2State createState() => _MyWidget2State();
}

class _MyWidget2State extends State<MyWidget2> {
  @override
  Widget build(BuildContext context) {

Indy9000

class MyWidget1 extends StatelessWidget {
  const MyWidget1({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    print('MyWidget1 is building');
    return Container(
        child: Text("Stateless Widget1", style: TextStyle(fontSize: 30)));
  }
}

Indy9000

Widget build(BuildContext context) {
  print('MyHomePage is building');
  return Scaffold(
    appBar: AppBar(
      title: Text(widget.title),
    ),
    body: Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[

Indy9000

@override
void paint(Canvas canvas, Size size) {
  ...

  final labels = _computeLabels();
  _drawYLabels(canvas, labels, points, boxW, border);

  // draw x labels
  final lt1 = Offset(border + boxW / 2.0, border + 4.5 * hu);
  _drawXLabels(canvas, lt1, boxW);

Indy9000

  List<String> _computeLabels() {
    return _Y.map((yp) => "${yp.toStringAsFixed(1)}").toList();
  }

  void _drawYLabels(Canvas canvas, List<String> labels, List<Offset> points,
      double boxW, double top) {
    var i = 0;
    labels.forEach((label) {
      final dp = points[i];
      final dy = (dp.dy - 15.0) < top ? 15.0 : -15.0;

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  List<Offset> _computePoints(Offset lt, double boxW, double boxH, double hr) {
    return _Y.map((yp) {
      final yy = boxH - (yp - _min) * hr;
      final dp = lt + Offset(0, yy);
      lt += Offset(boxW, 0);
      return dp;
    }).toList();
  }

  Path _computePath(List<Offset> points) {

Indy9000

void paint(Canvas canvas, Size size) {
    ...
      
    final hr = boxH / (_max - _min); // height per unit value
    final lt = Offset(border + boxW / 2.0, border);
    final points = _computePoints(lt, boxW, boxH, hr);
    final path = _computePath(points);
    canvas.drawPath(path, linePaint);
    _drawDataPoints(canvas, points, dotPaintFill);
}