How to draw the Shape of Text? - flutter

Question

Am trying to make an animated foreground for a title text in flutter or to more accurate i want mast the text with GIF something like this Am not even sure how to do it but i think if i managed to make stack filled with a GIF then make the last layer a CustomClipper<Path> to fill the entire space but the Text shape then it will look like it, the problem is i don't know how to make the text shape !plus i don't know how to make a path that just fill the entire size except the the text shape i will provide , please any help will be appreciated or if you have any ideas that will do it but in a different way am also interested and thanks in advance .

Answer 1

ah, I'm late..ok, let it be
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
appBar: AppBar(title: const Text('Title')),
body: Stack(
children: [
FakeAnimatedBackground(),
ShaderMask(
blendMode: BlendMode.srcOut,
shaderCallback: (bounds) => LinearGradient(colors: [Colors.black], stops: [0.0]).createShader(bounds),
child: SizedBox.expand(
child: Container(
color: Colors.transparent,
alignment: Alignment.center,
child: const Text('SOME TEXT', style: TextStyle(fontSize: 60, fontWeight: FontWeight.bold)),
),
),
),
],
),
),
);
}
}
class FakeAnimatedBackground extends StatefulWidget {
#override
_FakeAnimatedBackgroundState createState() => _FakeAnimatedBackgroundState();
}
class _FakeAnimatedBackgroundState extends State<FakeAnimatedBackground> with TickerProviderStateMixin {
AnimationController _controller;
#override
void initState() {
super.initState();
_controller = AnimationController(duration: const Duration(milliseconds: 5000), vsync: this)..repeat();
}
#override
Widget build(BuildContext context) {
return RotationTransition(
alignment: Alignment.center,
turns: Tween(begin: 0.0, end: 1.0).animate(_controller),
child: Container(
decoration: BoxDecoration(
gradient: SweepGradient(colors: [Colors.red, Colors.green, Colors.blue, Colors.red]),
),
),
);
}
}
FakeAnimationBackground class doesn't matter, it's just simulate background moving

Answer 2

you can use ImageShader, ShaderMask and StreamBuilder ( for gif )
import 'dart:async';
import 'package:flutter/material.dart';
import 'dart:ui' as ui;
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(
title: "test",
),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Stream<ui.Image> _image;
#override
initState() {
super.initState();
_image = _getImage();
}
Stream<ui.Image> _getImage() {
var _controller = new StreamController<ui.Image>();
new AssetImage('assets/b.gif')
.resolve(new ImageConfiguration())
.addListener(ImageStreamListener(
(info, _) {
_controller.add(info.image);
}
));
return _controller.stream;
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: StreamBuilder<ui.Image>(
stream: _image,
builder: (context, data) {
if (data.data == null)
return Text('loading');
return ShaderMask(
child: Text("Gif !!", style: TextStyle(fontSize: 50),),
blendMode: BlendMode.srcATop,
shaderCallback: (bounds) {
return ui.ImageShader(
data.data,
TileMode.repeated,
TileMode.repeated,
Matrix4.identity().storage,
);
},
);
},
),
));
}
}