squeakland April 2003

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104 participants
293 discussions

Partial List of Etoy Projects
by pierre-andre.dreyfuss＠edu.ge.ch 18 Apr '03

18 Apr '03

Hi, I'm new with E-Toys but working from some times with kids 12 - 15 years old. I made tic tac toe with differents laguages, logo , toontalk and the last one was Delphi and I'll just start doing it with E-Toys. First step is to build the interface. Use a text to show who's turn to play. Name this text 'turn' This text will show x then o then x ... So write the script 'next' which is changing x into O or O into x. This is done with a test tile. Something like test turn's character = 'x' yes : turn's character <- 'o' no : turn's character <- 'x' Take another text and name it 'cell' Build just a cell (you'll copy this cell when it is working to get the 9 cells.) You can define a script which should be fired with mouseup. If you try to mouseup on the text you'll just open the text for editing, since the mouse is already used for that. But the script will work if it receives a mouseup message from the tile fire. The solution is to cover the text with a transparent playfield embeded in the text. Make a little square with a playfield, using the color halo button set translucent to 0. The square is transparent put it on the text and use the menu embeded to embeded it in the cell. Now write a script in the cell cell's character <-- turn's character. turn's next set normal to mouseup for this script. write a script into the playfield with cell's fire in it. Set normal to mouseup for this script now copy this object using the green halo button to make the 9 cells. We need to make a button to clear the cells. Use a press me button and the green point in the bottom of its halo. Turn the script to tile (click the black square on the right of the round collaspse button. Then for each cell get the tile character <-- and put a space as value. cell's character <- ' ' cell1's character <- ' ' ... and so on. Now two humans can play tic tac toe. Up this point I did it with squeak while writing this script and it is working. Now I just describe what should be done . Step 2 We want to change in upper case a whole line of X or O. To do this we have to make 8 scripts one for each line and probably 8 for the three X and eight for the three O. We have to avoid playing in a cell containing something different of a space. step 3 If you succeed watching lines of three x or three o, then it will be not too difficult to search lines with two x and a space or lines with two o and a space. Now the algorithm for the computer. First search if the computer has a line with two marks and a space. if yes just play at the place of this space and computer win. If not search a line with two marks to avoid loosing. If not try to play at center if not try a corner if not try the middle of rows. If the computer starts you'll get null. If you starts you have a chance to win. You can improve this searching other specials lines. But remember if the computer is playing the best way , there is no more play, (see the movie War game ). There is no Winner, only null play. Best regards P-A Dreyfuss PS I'll post next week the addfrench method I have wrote to translate the scripts into french. -----Message d'origine----- De: Alan Kay A: squeakland(a)squeakland.org Date: 15.02.03 05:56 Objet: Re: Partial List of Etoy Projects Do you have a good algorithm or strategy for TicTacToe? Let me know and I'll see what I can do. There are some very interesting distributed system approaches that might be good here -- somewhat similar to the biological tree growing schemes in etoys that don't require recursion, but are "recursive" none the less. Cheers, Alan ----- At 1:50 PM +0100 2/14/03, Karl Ramberg wrote: >Alan Kay wrote: > >>Our impression is that most folks who have started in etoys have >>tended to stay with projects that are like the examples given on >>the website and have not gone much beyond those examples. This is >>just to point out that there are lots of really interesting >>mathematical, scientific and theatrical projects for which etoys >>are a pretty neat authoring environment. >> >Have anybody done a TicTacToe or FourInARow type of game in etoys? >I have been poundering with the idea a while and have not yet found >good way to make this kind of algorithms in etoys. > >Karl --

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Partial List of Etoy Projects
by arning＠charm.net 18 Apr '03

18 Apr '03

On Sat, 15 Feb 2003 12:59:37 +0100 Karl Ramberg <karl.ramberg(a)chello.se> wrote: >Alan Kay wrote: >> Do you have a good algorithm or strategy for TicTacToe? Let me know and >> I'll see what I can do. There are some very interesting distributed >> system approaches that might be good here -- somewhat similar to the >> biological tree growing schemes in etoys that don't require recursion, >> but are "recursive" none the less. >> >I can't find the growing tree etoy. Do you have a url or maybe the >project could be mailed to me :-) Karl, Look at the BioBranches.... projects on BSS. Cheers, Bob

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Open Charter School Institute
by Kim.Rose＠viewpointsresearch.org 18 Apr '03

18 Apr '03

-- Hello, I believe I informed you all of a 2 day annual "Institute" held by the Open Charter School in Los Angeles. The original dates for this year's event was March 7/8. However, due to administrative circumstances the school has had to change the date -- the "Constructivism in Action" Institute will now be held April 3 and 4th at the school. As part of this Institute BJ Conn will conduct a hands on Squeak workshop - geared for 4-6th grade. For more information contact: Robert Burk (rburk1(a)lausd.k12.ca.us) the school's principal. -- Kim

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etoy issues/making games and mazes
by benjamin.kunst＠web.de 18 Apr '03

18 Apr '03

I've downloaded the expamples below too. But I'm not able to learn scripting from the samples in reasonable time. I mean, I can imagine that (self color (...) sees (...) ) ~~ false ifTrue [doAnything] ifFalse[doAnything else] has something to do with the observed car's behaviour, but from that lines of code I even can't find out the scripting language basics (except the use of paranthesis and self, which is rather intuitive). I painfully missing a reference, a manual or a tutorial about the basic steps. I think that all the painting stuff is rather intuitive, but scripting can't be intuitive, I mean at least you have to know the key words. When I first found squeakland, I had the idea, that this could be very useful in two ways: - Intuitive creating projects focused on interactive learning, from first writing to speech support of handicapped pupils (my wife teaches in such a school) - Guided introduction in programming environments for children Does anybody share my problems? And much more important, has anybody an idea how get further? Benjamin squeakland(a)squeakland.org schrieb am 04.02.03 02:51:09: > > The 2 projects mentioned below were helpful for me to look at in my > maze pursuit. I'm actually getting there, albeit slowly. > I appreciated seeing the simpler "Sensor Car" project because it > actually works! On the other hand the more intricate, and presumably > powerful, Robot Car in Maze" project doesn't work; that is, I can't > figure out how to get the object to move through the maze. I'm > intrigued by the level of complexity that can be achieved in an etoy > environment. I just wish I felt more comfortable in controlling objects. > > Look forward to reactions. > Phil > > > On Wednesday, January 22, 2003, at 01:23 PM, Kim Rose wrote: > > > In repsonse to recent email queries about making mazes/and creating > > scripts with feedback, I direct you to the "project swiki" that is > > part of the Squeakland site: > > > > http://www.squeakland.org:8080/super/gallery > > > > If you specifically check out the "Robot car in Maze" and "Sensor Car" > > projects you can see by using a conditional/test tile and the "color > > sees" tiles you can make a simple feedback script by just using > > "forward by" and "turn by" tiles. > > ______________________________________________________________________________ Ihre Freunde sind in Italien? Schicken Sie ihnen trotzdem eine SMS mit WEB.DE FreeMail http://freemail.web.de/features/?mc=021172

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Open Charter School Institute
by Kim.Rose＠viewpointsresearch.org 18 Apr '03

18 Apr '03

I know, Bob! I am SO embarrassed! Could have been worse...but now everyone has my home # - oh well! Kim >On Thu, 6 Feb 2003 13:47:25 -0800 Kim Rose ><Kim.Rose(a)viewpointsresearch.org> wrote: >>I'll be in the office Friday from 8 AM -- 2:30... >>if I miss you those times, you should catch me at home (310) 285-9522 >>beween 5 and 6 probably! > > Talk to you soon! > >Kim, > >You sent this to the squeakland list. > >Chers, >Bob --

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Reacting to Keystrokes in Etoys
by scott.wallace＠squeakland.org 18 Apr '03

18 Apr '03

Several people have mentioned recently that they would like to be able react to keystrokes in etoy scripts. Attached is a simple project that illustrates one straightforward way that this could be done. Please have a look -- examine the "navigate" scripts of the two objects -- and see what you think. If there is interest, we could add this to the etoy system. Comments please! Cheers, -- Scott

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No subject
by sheine.mankovsky2＠tdsb.on.ca 18 Apr '03

18 Apr '03

I'm very pleased to let you all know that we will be welcoming Alan Kay and Seymour Papert to Toronto at the end of the month. They will be giving the keynote lectures to the Mathematics Education Forum Online Meeting sponsoured by the Fields Institute for Research in Mathematical Sciences, University of Toronto on Thursday, February 27, 2003 beginning at 7:00 p.m. The organizers have made arrangements for a simultaneous webcast and viewers will also have an opportunity to e-mail questions to the speakers from about 9:00 p.m. to 9:30 p.m. You can access the webcast at http://real.oise.utoronto.ca/ or through the Fields Institute website at http://www.fields.utoronto.ca/programs/. Hope you can attend:) Sheine Mankovsky Trustee, Toronto District School Board Ward 5, York Centre "Fear cannot be without hope nor hope without fear." --Baruch Spinoza

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Basic Collision Detection
by DeBuskJT＠wofford.edu 18 Apr '03

18 Apr '03

I've been working for the past few weeks on a very basic billiards game that requires collision detection. While I can "bounce" off the sides of the table just fine, I'm having real trouble getting two balls to "see" one another and collide. I can't quite grasp how it should be done w/o some sort of brute force method where each ball checks to see if it currently colliding with every other ball. This way seems inefficient and requires a lot of work... plus I can never seem to figure out WHERE I should actually be detecting the collision (should the game sort of work this out, or should balls be responsible for their own collision detection?). At this stage, I don't need it to be very realistic, I just want it to work. Has anyone worked out a similar problem before (or seen code that does something similar in Smalltalk/Squeak)? Is there any advice anyone can give me? Thanks.

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Partial List of Etoy Projects
by Alan.Kay＠squeakland.org 18 Apr '03

18 Apr '03

The list below is not meant to tantalize unfairly (because we haven't yet put out hints and project books for most of them). The reason I put out the list here is to encourage people who have gotten interested in etoys to look further before trying to find out what Squeak can do outside of etoys. (But for those who do want to find out and are well versed in computing, please visit http://www.squeak.org). Our impression is that most folks who have started in etoys have tended to stay with projects that are like the examples given on the website and have not gone much beyond those examples. This is just to point out that there are lots of really interesting mathematical, scientific and theatrical projects for which etoys are a pretty neat authoring environment. Cheers, Alan Partial List of 2D Etoy Projects for grade 5-8 ------------------------------------- Many Illusions for various ages Drive a Car Collaborative Car Races Sensing the Road Robot Car Robot Car Races Change of Position = Speed Random and its uses Change of Speed = Accelleration Simple Animations & Movies Hairdos and Faces Bouncing Mazes Sound Synthesis MPEG, MP3, MIDI, etc. A Dixieland Band Gravity and Objects Off a Cliff Water Balloon Cannon Lunar Lander Roller Coasters Vectors POVs Spaceships Spacewar Orbits Springs Weighing Gradient following - Salmon and Clownfish Tree Growing Epidemics Multiple Mentalities Grey Walter Conditioned Response Learning Circuit Models DTP Books Presentations Collaborations --

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problem from a beginner
by vellinga＠nwciowa.edu 18 Apr '03

18 Apr '03

Hello, I am trying to learn about squeak and writing a method to compute factorial using a loop. Here's my code =========== fact "an alternative to factorial method" | answer end | answer := 1. end := self. 1 to: end do: [:index | answer := answer * index. Transcript show: (answer printString), ' ', (index printString); cr. ] ============ The output looks fine, but when I call this method all that gets returned is the original value sent. Please help me clear this hurdle. mv

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squeakland April 2003