geopattern_flutter
Geometric Patterns for Flutter using CustomPainters.
Simple Example
import 'dart:convert';
import 'package:crypto/crypto.dart';
import 'package:flutter/material.dart';
import 'package:geopattern_flutter/geopattern_flutter.dart';
import 'package:geopattern_flutter/patterns/mosaic_squares.dart';
void main() => runApp(App());
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
final hash = sha1.convert(utf8.encode("flutter")).toString();
return LayoutBuilder(builder: (context, constraints) {
final pattern = MosaicSquares.fromHash(hash);
return CustomPaint(
size: Size(constraints.maxWidth, constraints.maxHeight),
painter: FullPainter(pattern: pattern, background: Colors.blueGrey));
});
}
}
creates
Patterns are fully customizable, for example a pattern created as
final pattern = ConcentricCircles(
radius: 40,
strokeWidth: 8,
nx: 6,
ny: 6,
strokeColors: List.generate(
36,
(int i) => Color.fromARGB(
10 + (gen.nextDouble() * 100).round(),
50 + gen.nextInt(2) * 150,
50 + gen.nextInt(2) * 150,
50 + gen.nextInt(2) * 150)),
fillColors: List.generate(
36,
(int i) => Color.fromARGB(
10 + (gen.nextDouble() * 100).round(),
50 + gen.nextInt(2) * 150,
50 + gen.nextInt(2) * 150,
50 + gen.nextInt(2) * 150)));
renders
Each pattern has an associated size. The FillPainter class implements CustomPainter such that the pattern is repetitively painted across the entire width and height of the canvas. However, each Pattern has a paint(Canvas, Offset) method that can be used to paint on its own.
There is an example for using a pattern as a background for SliverAppBar in example/appbar.dart
Source Credit Url : https://github.com/suyash/geopattern
