Beginners August 2012

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11 participants
9 discussions

testIndexOf test failure
by Edward Mokurai Cherlin 25 Aug '12

25 Aug '12

On page 24 of Squeak by Example it says to run the tests in CollectionsTest-Text, including a newly-defined method, testShout. In a fresh Squeak 3.9 I get an unexpected assertion failure for StringTest>>#TestIndexOf, which is defined as. testIndexOf "test for http://bugs.impara.de/view.php?id=3574" self assert: ('abc-' asWideString indexOfAnyOf: (CharacterSet newFrom: ' -0123456789')) = 4. self assert: ('ab7' asWideString indexOfAnyOf: (CharacterSet newFrom: ' -0123456789')) = 3. self assert: ('a2c' asWideString indexOfAnyOf: (CharacterSet newFrom: ' -0123456789')) = 2. self assert: ('3bc' asWideString indexOfAnyOf: (CharacterSet newFrom: ' -0123456789')) = 1. self assert: ('abc' asWideString indexOfAnyOf: (CharacterSet newFrom: ' -0123456789')) = 0. "extension to wide characters" self assert: ((String with: 803 asCharacter with: 811 asCharacter) indexOfAnyOf: (CharacterSet newFrom: (String with: 811 asCharacter with: 812 asCharacter))) = 2. self assert: ('abc' indexOfAnyOf: (CharacterSet newFrom: (String with: 811 asCharacter with: 812 asCharacter))) = 0. self assert: ('abc' indexOfAnyOf: (CharacterSet newFrom: (String with: 811 asCharacter with: $c))) = 3. I don't know how to copy the error messages from the TestFailure window. I have not yet started to learn the debugger, so I am at a lost to find out more. Any suggestions?

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Newbie stuck on page 43 of SBE getting syntax error trying to run SBEGame (Quinto)
by dav0 23 Aug '12

23 Aug '12

Hi, Squeak is really cool so far, but I have finally hit a snag I can't seem to figure out, and I think it may have something to do with the fact that I am attempting to run the SBE on a slightly newer version of Squeak maybe? I am on page 43 of the SBE book and I get the following syntax error when I follow this instruction: "In a workspace, type SBEGame new openInWorld and do it ." Thanks! -dav0 ---------- Syntax Error (Popup window) ------------------ HandMorph Morphic-Kernel he ---------- he user wants it and not just aligned with the cliprect" (patternForm isForm) ifFalse: [ "patternForm is a Pattern or Color; just Nothing more expected ->use it as a mask for BitBlt" ^ aPort fill: aPort clipRect fillColor: patternForm rule: Form over]. "do it iteratively" targetBox _ aPort clipRect. patternBox _ patternForm boundingBox. savedMap _ aPort colorMap. aPort sourceForm: patternForm; fillColor: nil; combinationRule: Form paint; sourceRect: (0@0 extent: patternBox extent); colorMap: (patternForm colormapIfNeededFor: aPort destForm). top _ (targetBox top truncateTo: patternBox height) + offset y. left _ (targetBox left truncateTo: patternBox width) + offset x. left to: (targetBox right - 1) by: patternBox width do: [:x | top to: (targetBox bottom - 1) by: patternBox height do: [:y | aPort destOrigin: x@y; copyBits]]. aPort colorMap: savedMap.

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Re: [Newbies] Simple semaphore to synchronize instances of > different classes
by patrick dudjalija 16 Aug '12

16 Aug '12

Hello Levente, Chris, As you stated, the problem came from the code executing at UI level (from workscript). Forking all the script works very fine ! Thanks very much for your help ! Patrick 2012/8/16, beginners-request(a)lists.squeakfoundation.org <beginners-request(a)lists.squeakfoundation.org>: > Send Beginners mailing list submissions to > beginners(a)lists.squeakfoundation.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.squeakfoundation.org/mailman/listinfo/beginners > or, via email, send a message with subject or body 'help' to > beginners-request(a)lists.squeakfoundation.org > > You can reach the person managing the list at > beginners-owner(a)lists.squeakfoundation.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Beginners digest..." > > > Today's Topics: > > 1. Re: Simple semaphore to synchronize instances of different > classes (Chris Cunnington) > 2. Re: Re: [Newbies] Simple semaphore to synchronize instances > of different classes (Levente Uzonyi) > 3. Re: Simple semaphore to synchronize instances of different > classes (Chris Cunningham) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 15 Aug 2012 16:11:40 -0400 > From: Chris Cunnington <smalltalktelevision(a)gmail.com> > Subject: Re: [Newbies] Simple semaphore to synchronize instances of > different classes > To: "A friendly place to get answers to even the most basic questions > about Squeak." <beginners(a)lists.squeakfoundation.org> > Message-ID: <502C027C.3040900(a)gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 12-08-15 3:12 PM, patrick dudjalija wrote: >> |ts sem| >> >> sem:=Semaphore new. >> >> [ts:= TestSynchro new. >> ts semaphore:sem. >> ts openInWorld. >> ts start.] fork. >> >> sem wait. >> Transcript cr; show:'Hello world !';cr. > Well, I can observer a few things. The first is that running this code > in a Workspace the tem vars are unnecessary. (ie. |ts sem|). The second > thing is that if I execute the code down to "fork" it runs fine. A blue > square appears in the corner and it counts steps one to nine in the > Transcript. It's only when you add "sem wait" that it freezes. I had to > use Command+. on my Mac to unfreeze it. And I'm not convinced this is a > bug. Remember, I don't think there is a Morph anywhere that uses > Semaphore in #step. I have a feeling this is not a bug and that it's > doing exactly what it's supposed to. You have created a Morph and now > you've stopped it with #wait. I bet that's locking up the entire World, > so it appears to freeze. That's my guess. > > HTH, > Chris > > > ------------------------------ > > Message: 2 > Date: Wed, 15 Aug 2012 23:03:27 +0200 (CEST) > From: Levente Uzonyi <leves(a)elte.hu> > Subject: Re: Re: [Newbies] Simple semaphore to synchronize instances > of different classes > To: "A friendly place to get answers to even the most basic questions > about Squeak." <beginners(a)lists.squeakfoundation.org> > Message-ID: > <alpine.DEB.2.00.1208152300240.15054(a)login01.caesar.elte.hu> > Content-Type: text/plain; charset="iso-8859-1" > > On Wed, 15 Aug 2012, patrick dudjalija wrote: > >> Sorry, i've sent an unfinished mail ... >> Second try : >> >> The problem : synchronizing an instance of a class gameEngine which starts >> instances of classes which implement transition screen / game levels. >> Pseudo-level code : >> >> Game engine >> - start introscreen- wait semaphore >> -start level 1 >> - wait semaphore >> - start level 2 >> -wait semaphore >> - start finished screen >> >> See example of code in Squeak with semaphore in my previous mails. >> I wonder why the code is freezing. > > If you evaluate something in a workspace, it will be executed by the UI > process. If you wait for something, then the whole UI will stop responding > while you're waiting. > Btw, I don't think Semaphores are the thing you're looking for. Semaphores > are for synchronizing processes, but AFAIK Morphic is a single process > framework. > > > Levente > >> >> Thanks for any help. >> >> Patrick Dudjalija >> >> >> >> 2012/8/15 patrick dudjalija <patrick.dudjalija(a)gmail.com> >> Hello Chris ! >> Thank you for the link. Free books of Stephane Ducasse are inderdeed a >> *MUST*. >> http://stephane.ducasse.free.fr/FreeBooks.html >> (BTW, everybody should consider a little donation to support him) >> >> I'm realizing that my question is unclear. >> Let me have a new try in pseudocode. >> >> The problem : synchronizing an instance of a class gameEngine which starts >> instances of transition screen / game levels. >> >> Game engine >> >> >> >> >> >> 2012/8/15 <beginners-request(a)lists.squeakfoundation.org> >> Send Beginners mailing list submissions to >> beginners(a)lists.squeakfoundation.org >> >> To subscribe or unsubscribe via the World Wide Web, visit >> >> http://lists.squeakfoundation.org/mailman/listinfo/beginners >> or, via email, send a message with subject or body 'help' to >> beginners-request(a)lists.squeakfoundation.org >> >> You can reach the person managing the list at >> beginners-owner(a)lists.squeakfoundation.org >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Beginners digest..." >> >> >> Today's Topics: >> >> 1. Simple semaphore to synchronize instances of different >> classes (patrick dudjalija) >> 2. Re: Simple semaphore to synchronize instances of different >> classes (Chris Cunnington) >> >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Tue, 14 Aug 2012 21:24:06 +0200 >> From: patrick dudjalija <patrick.dudjalija(a)gmail.com> >> Subject: [Newbies] Simple semaphore to synchronize instances of >> different classes >> To: beginners <beginners(a)lists.squeakfoundation.org> >> Message-ID: >> >> <CAEMqm6GttreSY5i+SA=Hg1=C8sAszQOu63miV_R5cfAW5a77Sw(a)mail.gmail.com> >> Content-Type: text/plain; charset="iso-8859-1" >> >> Hi everybody ! >> >> I'm developing an educative game. >> I've written a "gameEngine" class which does the logic for the >> general >> progression in the game : switching between instances of morph >> subclasses which implement intro screen / mini-games/levels / end >> screen etc ... >> >> Now, i need to synchronize the instance of the gameEngine class >> with >> the instances of the other classes. >> Example : once the gameEngine starts the instance of a morph >> subclass >> which implements a mini-game, it must sleep until the mini-game is >> finished, and then wake up and does further required switching >> (next >> mini-game or intro screen or end screen ...). >> >> i thought that a "simple" semaphore would quickly give a solution >> to >> the problem. >> But i get a freezed code. >> >> I've modelized/simplified the problem with the following workspace >> code. >> See also fileout of Class TestSynchro as attachment. >> TestSynchro has a step method which prints some lines to >> Transcript, >> then calls the method stopStepping and signal to the semaphore. >> The workspace code does a wait, before printing to Transcript 'Hello >> World'! >> >> Problem is that the code freezes , on the line code -> sem wait >> I first thought that the code freezed because in the same process. >> And >> added a fork to the block which creates instance of TestSynchro. >> But >> it does'nt help ... >> >> Any help will be appreciated ! >> Thanks by advance, >> >> Patrick Dudjalija >> >> >> >> |ts sem| >> >> sem:=Semaphore new. >> >> [ts:= TestSynchro new. >> ts semaphore:sem. >> ts openInWorld. >> ts start.] fork. >> >> sem wait. >> Transcript cr; show:'Hello world !';cr. >>

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Re: Re: [Newbies] Simple semaphore to synchronize instances of different classes
by patrick dudjalija 15 Aug '12

15 Aug '12

Hello Chris ! Thank you for the link. Free books of Stephane Ducasse are inderdeed a *MUST*. http://stephane.ducasse.free.fr/FreeBooks.html (BTW, everybody should consider a little donation to support him) I'm realizing that my question is unclear. Let me have a new try in pseudocode. The problem : synchronizing an instance of a class gameEngine which starts instances of transition screen / game levels. Game engine 2012/8/15 <beginners-request(a)lists.squeakfoundation.org> > Send Beginners mailing list submissions to > beginners(a)lists.squeakfoundation.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.squeakfoundation.org/mailman/listinfo/beginners > or, via email, send a message with subject or body 'help' to > beginners-request(a)lists.squeakfoundation.org > > You can reach the person managing the list at > beginners-owner(a)lists.squeakfoundation.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Beginners digest..." > > > Today's Topics: > > 1. Simple semaphore to synchronize instances of different > classes (patrick dudjalija) > 2. Re: Simple semaphore to synchronize instances of different > classes (Chris Cunnington) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 14 Aug 2012 21:24:06 +0200 > From: patrick dudjalija <patrick.dudjalija(a)gmail.com> > Subject: [Newbies] Simple semaphore to synchronize instances of > different classes > To: beginners <beginners(a)lists.squeakfoundation.org> > Message-ID: > <CAEMqm6GttreSY5i+SA=Hg1= > C8sAszQOu63miV_R5cfAW5a77Sw(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi everybody ! > > I'm developing an educative game. > I've written a "gameEngine" class which does the logic for the general > progression in the game : switching between instances of morph > subclasses which implement intro screen / mini-games/levels / end > screen etc ... > > Now, i need to synchronize the instance of the gameEngine class with > the instances of the other classes. > Example : once the gameEngine starts the instance of a morph subclass > which implements a mini-game, it must sleep until the mini-game is > finished, and then wake up and does further required switching (next > mini-game or intro screen or end screen ...). > > i thought that a "simple" semaphore would quickly give a solution to > the problem. > But i get a freezed code. > > I've modelized/simplified the problem with the following workspace code. > See also fileout of Class TestSynchro as attachment. > TestSynchro has a step method which prints some lines to Transcript, > then calls the method stopStepping and signal to the semaphore. > The workspace code does a wait, before printing to Transcript 'Hello > World'! > > Problem is that the code freezes , on the line code -> sem wait > I first thought that the code freezed because in the same process. And > added a fork to the block which creates instance of TestSynchro. But > it does'nt help ... > > Any help will be appreciated ! > Thanks by advance, > > Patrick Dudjalija > > > > |ts sem| > > sem:=Semaphore new. > > [ts:= TestSynchro new. > ts semaphore:sem. > ts openInWorld. > ts start.] fork. > > sem wait. > Transcript cr; show:'Hello world !';cr. >

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Simple semaphore to synchronize instances of different classes
by patrick dudjalija 14 Aug '12

14 Aug '12

Hi everybody ! I'm developing an educative game. I've written a "gameEngine" class which does the logic for the general progression in the game : switching between instances of morph subclasses which implement intro screen / mini-games/levels / end screen etc ... Now, i need to synchronize the instance of the gameEngine class with the instances of the other classes. Example : once the gameEngine starts the instance of a morph subclass which implements a mini-game, it must sleep until the mini-game is finished, and then wake up and does further required switching (next mini-game or intro screen or end screen ...). i thought that a "simple" semaphore would quickly give a solution to the problem. But i get a freezed code. I've modelized/simplified the problem with the following workspace code. See also fileout of Class TestSynchro as attachment. TestSynchro has a step method which prints some lines to Transcript, then calls the method stopStepping and signal to the semaphore. The workspace code does a wait, before printing to Transcript 'Hello World'! Problem is that the code freezes , on the line code -> sem wait I first thought that the code freezed because in the same process. And added a fork to the block which creates instance of TestSynchro. But it does'nt help ... Any help will be appreciated ! Thanks by advance, Patrick Dudjalija |ts sem| sem:=Semaphore new. [ts:= TestSynchro new. ts semaphore:sem. ts openInWorld. ts start.] fork. sem wait. Transcript cr; show:'Hello world !';cr.

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Porting BallonMorph to Processing (Java)
by Werner Gaisbauer 13 Aug '12

13 Aug '12

Hello, I really like the BallonMorph of Squeak (aka tooltip) and would like to port it to another programming language. But I’m a newbie in Smalltalk and Squeak so I’m having a hard time understanding e.g. the getVertices method. As far as I understand this method creates the vertices of the polygon that is the speech bubble? It would really help me if someone could post this method in e.g. Java (my goal is to port BalloonMorph to Processing - see http://www.processing.org/) or give me some hints on how to read it. Here is the method: getVertices: bounds "Construct vertices for a balloon up and to left of anchor" | corners | corners := bounds corners atAll: #(1 4 3 2). ^ (Array with: corners first + (0 - bounds width // 2 @ 0) with: corners first + (0 - bounds width // 4 @ (bounds height // 2))) , corners Thanks for helping, Werner Gaisbauer

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RFB from where?
by Herbert König 05 Aug '12

05 Aug '12

Hi, in image SM lists no RFB, Squeaksource has nothing to download and SqueakMap web interface offers a version for Squeak 3.6. Is this the right one to use with trunk or did I miss a younger one? Thanks, Herbert

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RFB from where?
by Chris Cunnington 05 Aug '12

05 Aug '12

" Hi, in image SM lists no RFB, Squeaksource has nothing to download and SqueakMap web interface offers a version for Squeak 3.6. Is this the right one to use with trunk or did I miss a younger one? Thanks, Herbert" http://www.squeaksource.com/RFB.html This works on 4.1. The last verison, #6, was a change Ian made at my request. RFB no longer works on Squeak - 4.2 or 4.3. Levente said something about a global being changed or something. I don't think we have RFB at the moment. Chris

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using color tables with forms and bitblt?
by Lawson English 03 Aug '12

03 Aug '12

OK, I'm such a noob here, that I'm not quite sure how to ask my question... I have a "dwell file" -an array of values generated by a Mandelbrot Set application, one per pixel, with arbitrary values between 1 and xxxxxxxxxxx (currently less than 2 billion, and right now far less than 1,000,000)- and I would like to use them, suitably tweaked, as indices into a ColorMap. The ColorMap need not have 1,000,000 entries. No-one can see that many color differences in a Mandelbrot set anyway. I can generate an array of Color (ColorArray?) but I'm not sure how to use them to create the ColorMap, and I'm not sure how to use the ColorMap to speedily change what is drawn in the first place. Right now, I'm creating a color dictionary and drawing via: 1 to: 800 do: [:y| 1 to: 800 do: [:x| |i| i := x+ ((y-1) *800). aForm colorAt: x@y put:( myDictColors at: (myArray at: i )).] ]. where myDictColors is a dictionary whose keys are the dwells listed in the dwell array file and whose values are Color objects from my array of colors. Drawing the above takes about 1.5 seconds, which is a bit slow. I'd like realtime-ish updating as I play with colors in the palette. Can this be done, at least up to the 4096 color limit that BitBlt has for ColorMaps? If so, how? I've been trying to figure out the various classes and I'm stumped. Thanks -- Squeak from the very start (introduction to Squeak and Pharo Smalltalk for the (almost) complete and compleate beginner). https://www.youtube.com/playlist?list=PL6601A198DF14788D&feature=view_all

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Beginners August 2012