Wednesday, 3 May 2017

Moving To AngularDart 3

Angular Dart 3 final was released and NP8080 (simple web based text editor) has been built with the latest version. It has been a fun little project and I have found myself using it daily as a scratchpad.

Not a massive amount to report - Angular very stable since the Betas. Certainly feeling a bit more Dart-y. The most disruptive change was the deprecation of EventEmitter but as this was a thin wrapper around a standard Dart Stream it wasn't much of a loss though I had 20 occurrences to update!

The code is straightforward as:

  final StreamController onShowDialogChange = new StreamController();
  ...
  @Output()
  Stream get showDialogChange => onShowDialogChange.stream;
  ...
  void closeTheDialog() {
    showDialog = false;
    onShowDialogChange.add(showDialog);
  }

Of course, another option is to copy the EventEmitter class into your own project. Interesting to see AngularDart using core Dart classes, perhaps the start of a larger divergence of the two codebases.

Looking back to the first build of NP8080, the output JS was 300k(ish). The current build is around 200k JS which is great improvement considering the increase of application code over that time. When you consider a basic Dart web app is around 110k, it is even more impressive to have Angular framework squeezed into <90k.

Please raise an issue if you have a feature request. PRs welcome too!

Friday, 28 April 2017

Forest Fire - Now With Mountains and Lochs


The forest fire cellular automata was a lot of fun to work on and watch. It has now been updated thanks to a welcome pull request which adds a Speed slider to the UI.

I extended it further to add some simple procedurally generated mountains and lochs (lakes). One challenge here was to keep the time down (it takes a lot of recursion). A quick way to get some speed was to reduce the resolution so each cell is 3 pixels square rather than 1.

The interface isn't as phone friendly as it was but is still usable and runs fine and at a decent speed. This thing will happily keep a core of your CPU burning so be sure to close the tab if you are on low battery!

Thinking ahead I would like to make the mountains less round and add an isometric view. Feel free to beat me to it with a pull request. Enjoy!


Monday, 24 April 2017

Dart SDK and Dartium 1.23.0 Chocolatey Packages for Windows

Chocolatey is a package manager for Windows similar to Linux's apt-get, based on Microsoft's Nuget tool and Powershell scripting language. It works from the command-line and from a WPF GUI interface.

You can install unmoderated versions by specifiying the install version during installation.
Chocolatey has also been updated with versions 1.23.0
Command line installation:
choco uninstall dart-sdk

choco install -y dart-sdk  -version 1.23.0
To verify you have the right version on your path.
dart --version
Dart VM version: 1.23.0 (Fri Apr 21 03:13:00 2017) on "windows_x64"

Command line installation:
choco uninstall dartium

choco install -y dartium  -version 1.23.0

Wednesday, 15 February 2017

Dart SDK and Dartium 1.22.0 Chocolatey Packages for Windows

Chocolatey is a package manager for Windows similar to Linux's apt-get, based on Microsoft's Nuget tool and Powershell scripting language. It works from the command-line and from a WPF GUI interface.

You can install unmoderated versions by specifiying the install version during installation.
Chocolatey has also been updated with versions 1.22.0
Command line installation:
choco uninstall dart-sdk

choco install -y dart-sdk  -version 1.22.0
To verify you have the right version on your path.
dart --version
Dart VM version: 1.22.0 (Mon Feb 13 17:39:28 2017) on "windows_x64"

Command line installation:
choco uninstall dartium

choco install -y dartium  -version 1.22.0

Saturday, 11 February 2017

Cellular Automata - Forest Fire

Cellular Automata has featured on this blog before - Conway's Game of Life. Whilst on the Rosetta Code site I stumble upon the Forest Fire model. Of course, a Dart version was soon underway - specifically designed to fit nicely on my phone's screen.

The model's rules are straightforward:

"A burning cell turns into an empty cell
A tree will burn if at least one neighbor is burning
A tree ignites with probability   f   even if no neighbor is burning
An empty space fills with a tree with probability   p"

Watch the video below, try it out here(link fixed) or view the source code.

Wednesday, 11 January 2017

Set The Title Of A Web Page in Angular2 / AngularDart

This is just a tiny snippet for Angular2 / AngularDart that I decided was worth a blog post because it is A) a FAQ and B) has lots of weird Angular 1 workarounds on the web that may be time wasting rabbit trails!

How to set the web page Title from Angular?
import 'package:angular2/src/platform/browser/title.dart';
....
 Title _title = new Title();
....
_title.setTitle(text);