main.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  HomePage() : super(); // changed

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

class _HomePageState extends State<HomePage> {

  Offset _offset = Offset(0.2, 0.6);


  @override
  Widget build(BuildContext context) {
    return Transform(
        transform: Matrix4.identity()
          ..setEntry(3, 2, 0.001)
          ..rotateX(0.01 * _offset.dy)
          ..rotateY(-0.01 * _offset.dx),
        alignment: FractionalOffset.center,
        child: GestureDetector(
          onPanUpdate: (details) => setState(() => _offset += details.delta),
          onDoubleTap: () => setState(() => _offset = Offset(0.2, 0.6)),
          child: _app(context),
        )
    );
  }

  _app(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.blue[200],
      appBar: AppBar(
        title: Text('Perspective 3D Demo'),
      ),
      body: Center(
        child: Column(
          children: [
            Image.network("https://scontent-bru2-1.xx.fbcdn.net/v/t1.6435-9/88423283_2944285712276957_1169081946123272192_n.png?_nc_cat=111&ccb=1-5&_nc_sid=09cbfe&_nc_ohc=nk4TkEMKj-kAX_KzrRE&_nc_oc=AQlYL0osvgs0bAsfwkPbTtCcCMrxOwOGYaYblkPkQZV-WcN6Wf8G5q8Zsvlu_Lv1e90&_nc_ht=scontent-bru2-1.xx&oh=d69441344c0431d04d9dfa52b59bc8d4&oe=61C32B30",scale: 1.5,),
          ],
        ),
      ),

    );
  }

}