Scratch

never mind-figured out myself 

Last edited by roijac (2011-08-22 08:08:15)

bharvey wrote:

Check out my project about finite state machines and regular expressions.

Ahh! It refuses to load! I really wanted to see the regular expressions part!

bharvey wrote:

fullmoon wrote:

roijac wrote:

...

Out of curiosity, where did you find a block called THE BLOCK WITH INPUTS?

He Built His Own Block, of course!   

Oh! I forgot you could do that! 

I usually think in terms of anonymous closures rather than formal function definitions, so that possibility actually slipped my mind. Apologies!

Hey, bharvey. How are you recovering? 

Snap! update

in our nasciturus prototype we're now starting to experiment with variables:



Enjoy!

@Jens :
Your SNAP works perfectly well, see my :
http://www.xleroy.net/ByobTuto/New/squarespiral.gif

To fill values in BLUE instructions is still tricky (I am using Firefox)

Thanks, Xavier, and scimonster for your testing and feedback! I love the squiral example and keep a similar running in a forever loop on my desktop all day. 

Which version of Firefox are you currently using? (v.6 or even beta 7 should be pretty fast and also less memory intensive). Yeah, I need to decrease the minimum width for reporter blocks, so short ones don't have a lot of empty space. Icons for the stop block and for the turn blocks are also on my list, but they're easy to do, so I'll concentrate on more hard stuff for now (script variables are next).

Thanks again!

@Jens
i was still Firefox 3.1 (because I liked the portable version). I've now moved to 7.0.
Much cleaner for Snap, and probably much quicker I shall test that deeper.

@Jens
Effectively, for this squarespiral example Snap is 2,5 times faster than Byob 3.1 !!
Good news.

Hi Xavier,
I'm very glad that you're now experiencing better performance with the new prototype, as Brian keeps pointing out, that's the main reason for the reimplementation. The HTML5 canvas API is still very new and there have been spectacular performance gains in almost all recent browser versions. This makes me confident that BYOB will be alright in JavaScript, even though Squeak technically is (much) faster.

@bharvey&Jens
See this example : http://www.xleroy.net/ByobTuto/New/geometricspiral.gif
This applications takes 4mn 50 with Byob and 1 mn 09 with Snap. It is a significant progress. But anyway nothing to compare with tremendously fast XLogo interpreter written in js. See 3D examples at :
http://xlogo.tuxfamily.org/fr/html/examples-fr/3d.html
(each example can be run - see for example "eponge de Menger" )

Hi Xavier, Snap will get much faster in its atomic blocks. For a preview you can open an inspector on the Sprite in the web prototype (right-click on the pointer thing, select "a Sprite Morph" and then "inspect", and type the following JS code into the evaluation pane (at the bottom):

   this.startWarp();
   this.down();
   this.tree(12, 120, 20);
   this.endWarp();

then select all (ctrl-a), right-click on the selection and choose "do it". This will draw a LOGO tree with 12 iterations, and pretty fast, too. It is about the speed which atomic blocks will have in Snap, if we decide on "brutal atomicity" (which is yet a matter of experiment and debate)...