geopattern_flutter

pub package

Flutter Port of jasonlong/geo_pattern

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

Demo

TODO

  • Tesselation
  • Xes

Libraries

chevrons
concentric_circles
diamonds
geopattern_flutter
hexagons
mosaic_squares
nested_squares
octagons
overlapping_circles
overlapping_rings
pattern
plaid
plus_signs
sine_waves
squares
triangles