Animation, increase and decrease the size

I have a problem with the animation, I want the heart to start small, increase and then decrease in size, as shown in the gif below.

Desired animation

But the current behavior is that the heart starts out big and then slows down.

Would anyone know what it would take to fix the animation?

Here is the flutter code:

import 'package:flutter/material.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(      home: MyHomePage(),    );  }}class MyHomePage extends StatefulWidget {  MyHomePage();  @override  _MyHomePageState createState() => _MyHomePageState();}class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {  Animation<double> _heartAnimation;  AnimationController _heartController;  @override  void dispose() {    _heartController.dispose();    super.dispose();  }  void _animate() {    _heartController      ..reset()      ..forward(from: 0.0)      ..reverse(from: 1.0);  }  @override  void initState() {    super.initState();    final quick = const Duration(milliseconds: 500);    final scaleTween = Tween(begin: 0.0, end: 1.0);    _heartController = AnimationController(duration: quick, vsync: this);    _heartAnimation = scaleTween.animate(      CurvedAnimation(        parent: _heartController,        curve: Curves.elasticOut,      ),    );  }  @override  Widget build(BuildContext context) {    return Scaffold(      body: Center(        child: ScaleTransition(          scale: _heartAnimation,          child: Icon(Icons.favorite, size: 160.0, color: Colors.red),        )      ),      floatingActionButton: FloatingActionButton(        onPressed: () {          _animate();        },        child: Icon(Icons.favorite_rounded),      ),    );  }}