squeakland May 2007

squeakland@lists.squeakfoundation.org

24 participants
27 discussions

telecenter in Brazil
by Marta Voelcker 21 May '07

21 May '07

Padrão Papel de cartaHi friends, thanks so much for the many messages I received today, I will read them tonight , translate to our local team and try to make a draft of our first initiatives using Squeak ,and maybe Scratch in Telecenters. To answer some questions: there are telecenter using Windows and Telecenters using Linux. thanks for your support, best regards Marta Voelcker

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Re: [Squeakland] When to define a local variable
by Alan Kay 20 May '07

20 May '07

Hi Folks -- This list is mostly for teachers, parents and children, and is about the Etoys part of Squeak. Please use either the Squeak.org or the opencroquet.org (or one of the other Croquet lists) for these kinds of issues. Thank you, Alan ------------- At 09:11 PM 5/19/2007, Laurence Rozier wrote: >Hi, >Sorry for the delayed response ... I'm not on a Windows machine at >the moment but have applied available fixes to OpenGL problems which >you can find on the Croquet list. I've not seen the security error >you mention. > >Laurence >On 5/7/07, Eric Eisaman ><<mailto:eric.eisaman@gmail.com>eric.eisaman(a)gmail.com> wrote: >Hello, > >You mention Croquet as offering alternatives. I have been trying to >run Croquet on several different computers but always receive the >"Failed to Initiate OpenGL" error however, I recently installed the >latest OpenGL on all my computers. Do you know how to deal with >this? Also, I get a security error saying my Win32 platform has no >good source of entropy. How can I cope with this? If you have any >advice I would greatly appreciate it. > >Eric Eisaman > > >On 4/1/07, Laurence Rozier <<mailto:laurence.rozier@gmail.com> >laurence.rozier(a)gmail.com> wrote: > >On 3/31/07, Young-Jin Lee <<mailto:youngjin.michael@gmail.com> >youngjin.michael(a)gmail.com> wrote: >Hi, > >I am a newbie trying to learn Squeak. >The squeak book and tutorials says that I need to define a local >variable using a pipe like below: > >| someMuppet | >someMuppet := Muppet new. >someMuppet name: 'Elmo'. >someMuppet greet. > >But when I tried the same code without defining a local variable shown >below, I got the expected results, which makes me wonder when I should >define a local variable. > >anotherMuppet := Muppet new. >anotherMuppet name: 'Gookie Monster'. >anotherMuppet greet. > >My guess is that I need not define a local variable if my code is >being executed within a Workspace because all variables such as >anotherMuppet will have "Workspace" scope. > > >On the surface this is correct, but the language has no explicit >notion of "Workspace" scope. If you take a look at the comment in >the Class Workspace you can get a sense of how Workspaces end up >with this and other interesting/useful behavior as a result of >having the ide written in the language. Smalltalk/Squeak is more >than the grammar, it is an environment - the whole is greater than >the sum of the parts. Often we do type source code into text editors >as with other languages but eToys, Connectors, Croquet and other >tools offer alternatives. Depending on what language background >you're coming from this may be a subtle but very liberating >observation. You may not need to dig into this but if it seems >interesting to you, as you use different code editing tools in the >environment, try your code above or evaluate the word self. > >Enjoy! > >Laurence > >Can anyone please explain in more detail about variable scopes? > >Thanks in advance. > >Young-Jin Lee >_______________________________________________ >Squeakland mailing list ><mailto:Squeakland@squeakland.org>Squeakland(a)squeakland.org >http://squeakland.org/mailman/listinfo/squeakland > > > >_______________________________________________ >Squeakland mailing list ><mailto:Squeakland@squeakland.org>Squeakland(a)squeakland.org >http://squeakland.org/mailman/listinfo/squeakland > > > >_______________________________________________ >Squeakland mailing list >Squeakland(a)squeakland.org >http://squeakland.org/mailman/listinfo/squeakland

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When to define a local variable
by Young-Jin Lee 20 May '07

20 May '07

Hi, I am a newbie trying to learn Squeak. The squeak book and tutorials says that I need to define a local variable using a pipe like below: | someMuppet | someMuppet := Muppet new. someMuppet name: 'Elmo'. someMuppet greet. But when I tried the same code without defining a local variable shown below, I got the expected results, which makes me wonder when I should define a local variable. anotherMuppet := Muppet new. anotherMuppet name: 'Gookie Monster'. anotherMuppet greet. My guess is that I need not define a local variable if my code is being executed within a Workspace because all variables such as anotherMuppet will have "Workspace" scope. Can anyone please explain in more detail about variable scopes? Thanks in advance. Young-Jin Lee

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presentations / slide shows.
by Benedict Kavanagh 20 May '07

20 May '07

Hello all, I work on Linux. I know smalltalk reasonably well. I don't know the Squeak 2D Apis. I am interested in using Squeak as a platform to develop more engaging slideshow presentations. My talks are normally about formal methods in programming language semantics. I'm tired of the tedium of slides produced by beamer. I saw the keynote by Alan Kay in 2004 at OOPSLA. I want to make presentations like that. Can anyone confirm that the slides for that talk were written in Squeak? The Sophie project is a close fit for what I want. I was just wondering if there was any other work written in Squeak that I could look at that relates to my goal. In particular I would be interested in any presentations/slide shows that were written in Squeak as one-offs to see roughly how much is required for a 'from scratch' slide show as I generally prefer to sit on top of my own code when possible. Is there a FAQ about this topic? Cheers, Ben

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the concept of mass
by Paulo Drummond 14 May '07

14 May '07

Hi all, Following "Powerful Ideas..." - the great book by Kim & BJ, I'm trying to introduce the concept of mass (or weight, for simplicity of kid's undestanding), to enhance a project about pendula and energy. Any ideas? thanks, Paulo

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Midi Input with Squeak
by Eric Eisaman 13 May '07

13 May '07

Good Day Everyone, I wish to play the Squeak midi synth with my keyboard via a USB midi input. How can this be accomplished? Respectfully, Eric Eisaman

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Reminder! Call for presentations due for SqueakFest '07
by Kim Rose 11 May '07

11 May '07

Greetings - The deadline for the call for workshops and presentations for Squeakfest is May 15th (next Tuesday). If you would like to present please submit your info here: http://imamp.colum.edu/eceim/squeakfest07/callforparticipation.php thanks and cheers, Kim

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Konqueror service entry for Squeak Projects
by subbukk 10 May '07

10 May '07

Hi, I put together a short service entry for launching Squeak Projects (both local and in URLs in web pages) directly from Konqueror. When browsing folders or web-sites that refer to Squeak Project files, this service entry will launch the project in a new tab. To use it, copy the file to $HOME/.kde/share/apps/konqueror/servicemenus/ directory. Now, right click on a *.pr file or URL, select Actions and click on "Open as Squeak Project". Hope this helps, Subbu

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Re: [Squeakland] MixedMorph for kids
by karl 09 May '07

09 May '07

Ok, here is a eToy blob morph developed in the OLPC image Karl Alan Kay wrote: > Hi Karl -- > > Please send us this Etoy. > > Cheers, > > Alan > > -------------- > > At 01:42 PM 5/8/2007, karl wrote: >> subbukk wrote: >>> On Tuesday 08 May 2007 11:03 pm, Jerome Peace wrote: >>> >>>> There is a ear to ear grin across my face as I read >>>> your daughters comments. >>>> >>> It is so refreshing to look at the world through kids' eyes. For >>> instance, she called a two vertex Mixed a 'rubber band'. Well, so it >>> is! Mixed is really fun to play with. >>> >>> >>>> The enhancements I made to polygons that lead up to >>>> Mixed Morphs would work in 3.8. >>>> >>> I filed in the cs into SqueakPlugin image and got Mixed morph in >>> objects. I didnt use it extensively, but all basic operations seemed >>> to work fine. >>> >>> >>>> I want to see what kids would do if let loose with >>>> these things. >>>> >>> I wonder if it is possible to manipulate vertices through Morphic >>> Viewer? Then kids could create their own Blobs, model collisions of >>> squishy objects and so on. >> I did that in the OLPC image just a few days ago but it seems the >> vertices option has disappeared !? >> There have been lots of stuff happening to the OLPC image lately so I >> guess it's just a temporary outage. >> Anyway, I made a blob morph that worked just like the one in the >> image with just a few tiles of etoy. It was a fun experiment. >> >> Karl > >

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MixedMorph for kids
by Jerome Peace 09 May '07

09 May '07

Hi Yoshiki, [Squeakland] MixedMorph for kids > > Yoshiki Ohshima yoshiki at squeakland.org > Tue May 8 11:34:04 PDT 2007 > > > Subbu, > > > My 6-year old's favorite object is the "MixedMorph" in Squeak 3.9 because > of > > the way it handles like putty. She uses it to create all kinds of shapes > and > > pictures. She misses it in Squeakland plugin image. > > > > Will MixedMorph make it into the Plugin image? > > There was good discussion with Jerome about it, but I still have > "mixed" feeling toward including that to the Squeakland image (and the > OLPC image). This is due to the amount of modification it makes and I > have not figure out what kind of side-effects it might have. What test do you wish it to pass? What might it do that would make it unacceptable? It is large because it had a chance to develop over a long period of time. I do not think it is too far off of main stream for inclusion and it comes with big benefits. (Subbu's daugther's smile for one). I have a chicken and egg problem here in selling this to you. You won't have a feel for what it does until you include it and you won't include it until you have a feel for what it does. This started when I set myself to overcoming the limitations of the old curve morph and in particular the one sharp bend that was always present. I fixed several other bugs in polygons as I came across them. When I had achieved that Edgar asked for a way to get puzzle pieces and I created MixedCurveMorphs in response to that. Because my programming style tends to make my code easier to maintain and modify than the original code I could make swift progress. I still want to see what kids will do if they have the expessive power these morphs deliver. I recommend them to you. Subbu recommends them to you. Subbu's daughter reminds me of why I put in the self funded time and effort. It is in your hands. > (Not > that it have a bug or something, but it is a big commitment to change > all polygons.) > > For your 6-years old, CurveMorph with a bit more control points > would do? > There is a fundamental difference between a smooth closed curve and a smooth closed curve with endpoints. The old CurveMorph used the same smoothing for and open line as for a closed curve. The sharp bend is where the two endpoints meet. The mixed curves get their expressive power from using a true closed curve smoothing. Too enable backward compatiblity I left the option of turning that off by controling a preference flag. And I left CurvierMorphs do the smoother smoothing and CurveMorphs do the old smoothing. I tried to demonstrate in that way that the changes were not too radical. > For older kids, the OLPC version has Etoys scriptable polygons so > that they can actually write tile scripts to change the shape of a > polygon. One time I tried to merge them together, but the effort > didn't go far enough. That would be still nice to have... > If you choose to give it another go I am available to assist. Yours in curiosity and service, --Jerome Peace ____________________________________________________________________________________ Don't pick lemons. See all the new 2007 cars at Yahoo! Autos. http://autos.yahoo.com/new_cars.html

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squeakland May 2007