import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: MyWidget(),
    ),
  );
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: InteractiveViewer(
          maxScale: 6,
          child: Image.network(
            'https://cdn.pixabay.com/photo/2015/04/23/22/00/tree-736885__480.jpg',
          ),
        ),
       ),
    );
  }
}