gol_grid 0.2.0

A widget showing a controllable square grid of cellular automata.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:gol_grid/gol_grid.dart';
import 'package:grid_world/grid_world.dart';
import 'package:thumper/thumper.dart';

// ignore_for_file: diagnostic_describe_all_properties
// ignore_for_file: use_key_in_widget_constructors

void main() => runApp(const DemoApp());

/// A GolGrid widget demo.
@immutable
class DemoApp extends StatelessWidget {
  /// Make an app instance.
  const DemoApp({this.isFullScreen = true});

  /// Full screen consumes lots of pixels/CPU - best for Android.
  final bool isFullScreen;

  static const _spacer = SizedBox(height: 3);

  @override
  Widget build(BuildContext context) => MaterialApp(
        title: 'Game of Life Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: Scaffold(
            backgroundColor: Colors.grey,
            appBar: AppBar(
              title: const Text('Game of Life Demo'),
              leading: Icon(Icons.menu),
            ),
            body: isFullScreen ? FullScreenWidget() : _widgetColumn()),
      );

  Widget _widgetColumn() => Center(
        child: ListView(children: <Widget>[
          _spacer,
          GolGrid(DimensionedWorld.make(ConwayEvolver.blinker.lrPadded(6),
              lineWidth: 10, cellWidth: 30)),
          _spacer,
          GolGrid(
              DimensionedWorld.make(ConwayEvolver.pentaDecathlon.clockwise90(),
                  lineWidth: 6, cellWidth: 18),
              foregroundColor: Colors.deepPurple),
          _spacer,
          GolGrid(DimensionedWorld.make(
              ConwayEvolver.lightweightSpaceship
                  .appendBottom(ConwayEvolver.lightweightSpaceship)
                  .appendBottom(ConwayEvolver.lightweightSpaceship)
                  .padRight(50),
              lineWidth: 3,
              cellWidth: 9)),
          _spacer,
          GolGrid(
              DimensionedWorld.make(
                  ConwayEvolver.gliderFleet().padRight(20).padBottom(30),
                  lineWidth: 3,
                  cellWidth: 9),
              foregroundColor: Colors.redAccent),
          _spacer,
          GolGrid(DimensionedWorld.make(
              ConwayEvolver.gosperGliderGun.padded(20),
              lineWidth: 3,
              cellWidth: 9)),
          _spacer,
          GolGrid(
              DimensionedWorld.make(
                  ConwayEvolver.rPentimino.lrPadded(70).tbPadded(60),
                  lineWidth: 1,
                  cellWidth: 3),
              foregroundColor: Colors.white),
          _spacer,
        ]),
      );
}

/// [FullScreenWidget] does a media query to expand a [DimensionedWorld]
/// to fill the media.
///
/// The query only works if this widget is below [MaterialApp] in the tree.
class FullScreenWidget extends StatelessWidget {
  /// A guess as to the media height (virtual pixels) consumed by the AppBar.
  /// TODO: Instead of guessing, look up the appbar via a key, e.g.
  /// medium.com/@diegoveloper/flutter-widget-size-and-position-b0a9ffed9407
  static double get _estimatedAppBarHeight => 80; // 80

  @override
  Widget build(BuildContext context) {
    final s = MediaQuery.of(context).size;
    final dw = DimensionedWorld.make(ConwayEvolver.gunFight()
        .appendBottom(ConwayEvolver.rPentimino.padLeft(30).tbPadded(27))
        .appendBottom(ConwayEvolver.gunFight())
        .lrPadded(6));
    return GolGrid(dw.expandToFit(
        s.width, s.height - _estimatedAppBarHeight - Thumper.height));
  }
}