360 Flex Europe was fantastic…some 30onAIR videos !?!

04/19/2008 08:01 pm in Adobe Air

Ok, I am a bit late with my report but I was a bit busy the last weeks working on the Multi-Mania conference we are organizing in May but I really wanted to make a short wrap up of the conference. In some words : 360 FLEX Europe was fantastic !! I cannot describe it in [...]

Runtime expression evaluation in ActionScript

04/19/2008 06:00 pm by sephiroth.it - flash & php in actionscript

Finally I have a bit of free time to write down this post. Some days ago a guy on the forum asked about how to evaluate at runtime simple mathematical expressions with support for symbols and function calls.

Now that the eval function have been removed from the language for reasons I've not enought time to talk about, we need to parse and execute those expressions manually.

I built a simple Actionscript library that can be used to parse mathematical expressions: it has support for function calls, for variables and it is able to convert the expression into a postfix rappresentation if you may need it. The expression parser is quite simple and have been built manually following some concepts related to programming language compilers; it includes a Scanner (or lexer - however you want to call it) to tokenize the expression, a Parser that convert the expression into an Abstract Syntax Tree and a simple routine that evaluates that AST using a Symbol Table as evaluation context.

There are no comments inside the code right now; I hope to find a little bit of time to write an in depth discussion about this topic. In the mean time you can continue reading the entry for a general explanation about how does the code works and for some examples that may be useful.

Here is a simple example that shows how does the code works:


import it.sephiroth.expr.CompiledExpression;
import it.sephiroth.expr.Parser;
import it.sephiroth.expr.Scanner;

public class Example
{
  public static function run(): void
  {
    var expression: String = "sin( x / ( 8 / 2 + (-0.12 + 2.3) * x / x ) ) * 100";
    var scanner: Scanner = new Scanner( expression );
    var parser: Parser = new Parser( scanner );
    
    var compiled: CompiledExpression = parser.parse();
    
    var context: Object = {
      x:    100,
      sin:   Math.sin,
      cos:  Math.cos
    };
    
    trace( 'Postfix:', compiled.toString() );
    trace( 'Result:', compiled.execute( context ) );
  }
}

Before I forgot, you can download the source code here with a simple example included.

Getting Started with PV3D in Flash or Flex

04/19/2008 03:48 pm in Papervision 3D

Hacking the AMFPHP Deserializer with Propel

04/19/2008 03:34 pm by Christophe Herreman in AMFPHP

I've been working on a project lately that uses Flex, AMFPHP, Propel and MySQL. For most of you these technologies may be well known, except maybe for Propel. In this post, I'll briefly mention what Propel is, what it does and how you can hack the AMFPHP Deserializer to make maximum use of Propel. Propel From the [...]

AIR Badge WordPress plugin

04/19/2008 02:26 pm by Peter Elst in AIR

If you want to distribute AIR applications the install badge is definitely the best way to go. The one problem I had with it is that its a pain to prepare and embed on your blog. To help remedy this I started working on this AIR Badge plugin last night, it allows you to simply use [...]

FOTB tickets on sale. Get the earlybird pricing!

04/19/2008 12:11 pm in Flash

I’m up bright and early to do some last minute packing and head to the airport for FiTC Toronto. Yeah! But I did want to mention that Flash on the Beach tickets are now on sale! There are 250 earlybird tickets at an unbelievably low price. You know you’re going, so get in cheap! http://www.flashonthebeach.com/tickets/

BLITZ gives Internet a boost of energy with two sites for Naked Juice

04/19/2008 03:14 am by BLITZ Labs, the BLITZ Agency Blog in BLITZ Projects

BLITZ helped our clients at Naked Juice launch a new website that reflects the company’s promise of delivering a pound of bare-naked, all natural fruit in every 15.2 oz bottle of juice (or half pound of fruit in every 10 oz bottle). In addition to learning about all of the goodness that goes into every product, visitors can [...]

The GAE SWF Project

04/19/2008 01:02 am by Aral Balkan in General

Today I'm releasing The GAE SWF Project, a resource of Flash and Flex-related knowledge specifically aimed at getting you up and running quickly with Google App Engine. If you want to skip all the details and start playing with it, skip to the Getting Started section. Everyone else, read on! When Google announced Google App Engine last [...]

Newsbrew is now a Google Application

04/18/2008 09:16 pm by Christian Cantrell in Web Development

I wrote a news aggregator a couple of years ago called Newsbrew which I primarily used for my own news-reading needs. After Google launched the Google App Engine, I decided to take a little break from Flex and AIR and rewrite Newsbrew in Python to get a good feel for the GAE experience.

SQLite in Adobe AIR session video

04/18/2008 07:17 pm by Peter Elst in AIR

If you missed my SQLite talk at one of the onAIR tour events earlier this month, Mike Chambers recorded it in Brussels and its now available to watch online. Upcoming events where I’ll be covering Adobe AIR are Multi-Mania, Scotch on the Rocks and another In-the-Brain session on “The Evolution of the Flash Platform” with [...]

Flex binding to numbers and increment issue

04/18/2008 06:38 pm by FlashApe in

Anyone know what's going on here? I have a property on a model that is bindable: PLAIN TEXT Actionscript: [Bindable] public var currentAmount:Number = 0; I have a command that increments that value, by some fractional amount: PLAIN TEXT Actionscript: [Bindable] model.currentAmount += 1.25; What's happening is I am winding up with values like 1.25000000000000000001. Even wierder is that the last [...]

Flex container rounded corners

04/18/2008 06:38 pm by FlashApe in

Just putting this up there in case anyone else needs it: if you are trying to get rounded corners on your container (like HBox) by setting the cornerRadius style, you need to make sure that you also set the borderStyle to 'solid' or the rounded corners won't render. You can set the borderThicknessProperty [...]

Detroit-Area AIR developer needed

04/18/2008 06:38 pm by FlashApe in

If you are in, or can get to, or would like to travel (travel expenses paid) to Detroit next week to work on a small AIR (Flex) project then please leave a comment or shoot me an email.

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