How to draw overlapped ractangles with some positioning in flutter? - flutter

Question

I want to draw multiple rectangles like this
I have used CustomPainter to get desired result but getting something different.
I have shared the code and undesired output image below,
Please help me to draw the overlapped ractangles with some positioning to get desired output.
import 'package:flutter/material.dart';
class SplashScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
double _width = MediaQuery.of(context).size.width;
// double _height = MediaQuery.of(context).size.height;
return Scaffold(
body: Container(
width: _width,
// height: _height,
child: Center(
child: Stack(children: <Widget>[
CustomPaint(
painter: DrawCustomRect(0, 0, 80, 112, 0xFFFA2A2A),
),
CustomPaint(
painter: DrawCustomRect(0, 0, 16, 96, 0xFFFF5454),
),
CustomPaint(
// DrawCustomRect(_left,_top,_right, _bottom, _color);
painter: DrawCustomRect(0, 0, 16, 80, 0xFFFF8D8D),
),
]),
),
),
);
}
}
class DrawCustomRect extends CustomPainter {
final double _left;
final double _top;
final double _right; //width
final double _bottom; //height
final int _color;
DrawCustomRect(this._left, this._top, this._right, this._bottom, this._color);
#override
void paint(Canvas canvas, Size size) {
canvas.drawRect(
new Rect.fromLTRB(this._left, this._top, this._right, _bottom),
new Paint()..color = new Color(_color),
);
}
#override
bool shouldRepaint(DrawCustomRect oldDelegate) {
return false;
}
}

Answer 1

You can achieve this result using Containers inside a Stack:
Center(
child: Stack(
alignment: Alignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.only(left: 300),
width: 75,
height: 100,
color: Colors.red[300],
),
Container(
margin: EdgeInsets.only(left: 150),
width: 150,
height: 200,
color: Colors.red[600],
),
Container(
width: 225,
height: 300,
color: Colors.red[900],
),
],
),
),
And then adjust the sizes and colors based on what you want.
The result:

Answer 2

There are two approaches to it. The first and easy one is to use a combination of stack and container widget to achieve the above effect. Here's the code I used
import 'package:flutter/material.dart';
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: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Stack(
children: <Widget>[
Align(
alignment: Alignment(0.4, 0.1),
child: Container(
width: 60,
height: 60,
color: Colors.red[200],
),
),
Align(
alignment: Alignment(0.3, 0.1),
child: Container(
width: 70,
height: 70,
color: Colors.red[300],
),
),
Align(
alignment: Alignment(0.2, 0.1),
child: Container(
width: 80,
height: 80,
color: Colors.red[400],
),
),
Align(
alignment: Alignment(0.1, 0.1),
child: Container(
width: 90,
height: 90,
color: Colors.red[500],
),
),
],
),
),
);
}
}
The other one is by using the custom painter. You just have to fix some positioning in your code.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: SplashScreen(),
);
}
}
class SplashScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
double _width = MediaQuery.of(context).size.width;
// double _height = MediaQuery.of(context).size.height;
return Scaffold(
body: Container(
width: _width,
// height: _height,
child: Center(
child: Stack(
alignment: Alignment.center,
children: <Widget>[
CustomPaint(
painter: DrawCustomRect(112, 32, 0, 80, 0xFFFF8D8D),
),
CustomPaint(
painter: DrawCustomRect(96, 16, 0, 96, 0xFFFF5454),
),
CustomPaint(
painter: DrawCustomRect(80, 0, 0, 112, 0xFFFA2A2A),
),
],
),
),
),
);
}
}
class DrawCustomRect extends CustomPainter {
final double _left;
final double _top;
final double _right; //width
final double _bottom; //height
final int _color;
DrawCustomRect(this._left, this._top, this._right, this._bottom, this._color);
#override
void paint(Canvas canvas, Size size) {
canvas.drawRect(
new Rect.fromLTRB(this._left, this._top, this._right, _bottom),
new Paint()..color = new Color(_color),
);
}
#override
bool shouldRepaint(DrawCustomRect oldDelegate) {
return false;
}
}