Squeak-dev February 2006

squeak-dev@lists.squeakfoundation.org

141 participants
278 discussions

Truncation and round off
by Peace Jerome 07 Feb '06

07 Feb '06

Hi Andreas and Nicolas, In the bug report, I mentioned that using trucation (as opposed to floor ) had problems and pointed out that with the present implementation (where trucation is done separately for origin and corner) you could not count on aRectangle truncated extent = aRectangle extent truncated to always be true. I meant that as a dramatization of the problem not its sole difficulty. Andreas method could make that true but the truncation of the origin would still cause the bounds to jitter as quadrents are crossed. So it would not represent a complete solution to the truncation and rounding problem. Yours in service, --Jerome Peace >Truncation and round off >Andreas Raab andreas.raab at gmx.de >Sun Feb 5 21:22:25 CET 2006 wrote: > > >nicolas cellier wrote: >> Putting a constraint like: >> aRectangle truncated extent = aRectangle extent truncated >> whatever the coordinate transform is does not sound easy: maths say it is >> simply impossible even without a rotation (unless rectangle sides are 3*n and >> 4*n). > >Huh? And why would that be? The correct solution for that sort of >truncation is obviously: > >Rectangle>>truncated > ^Rectangle origin: self origin truncated extent: self extent truncated > >I see nothing that suggests there would be any difficulty. Well, at the speed at which you program I would imagine most fenceposts appear as blurs anyway. ;-p > >Cheers, > - Andreas __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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A London Smalltalk Meeting
by Bryce Kampjes 07 Feb '06

07 Feb '06

Hi, Francisco Garau and I are planning on organising a Smalltalk meeting in London in about a months time. If there's some interest we'll try to get a room somewhere. Otherwise, we could just meet on a Tuesday with XtC. There's some interest in doing something on a Saturday to allow people to travel from outside London. So, if you would like to meet other Squeakers or Smalltalkers in London, join the list below. Or join if you would like to organise something elsewhere in the country, join and some of us might manage to leave the M25 (or enter it). We've set up a mailing list for UK Smalltalk events below: http://lists.squeakfoundation.org/mailman/listinfo/uksmalltalk Thanks to the Squeak box-admins for setting this up for us. Bryce P.S The XtC web site is below: http://www.xpdeveloper.net/xpdwiki/Wiki.jsp?page=XtC They're an Extreme Programming group that meets every Tuesday.

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how to detect headless mode from code?
by Petr Fischer 07 Feb '06

07 Feb '06

Hi! Can I detect headless mode from code? (I have some server task implemented in squeak and I want to automatically quit from image after task is done - but only in headless mode.) Thanks, pf

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[ANN] See a Flaps into SqueakLight first run omega (as before alpha)
by Lic. Edgar J. De Cleene 06 Feb '06

06 Feb '06

The crows yell ³I want Flaps ³ ³And want now². ³If you put Flaps into maybe I consider it ³ ³Why you go to sleep and do not at your Mac ³ And I read you, Stef. I wish to dedicate this release to you, as proof of good faith. Monday morning maybe I go public, some glitches , but yes, I have Flaps Edgar

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newbie question about Squeak source code
by Seung H. Choi 06 Feb '06

06 Feb '06

Hi, I'm trying to get source cod for squeak to poke around and see if I can do anything interesting. I downloaded Squeak*.sources file from www.squeak.org, which is just a huge text file that I can't decipher. Then I wandered around a bit more, and found out that much of the code can be generated automatically from Squeak itself. Could anyone tell me how to do this? (Apparently this is not easy to find on the web) Also, if you have a link to a source tar file, I would appreciate it, but I still want to see automatic generation of the code. Thanks. -Seung

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mac carbon VM goes to unix file names, testers needed
by John M McIntosh 06 Feb '06

06 Feb '06

After much thought (years?) I've converted the mac carbon VM to unix path names by burning up a few sleepless nights, this assists in the pending MacIntel port and can be done before that happens. Since this is my fourth attempt at working the multiple aliased file paths it was a chance to rewrite that entire piece of logic into something much smaller and nicer. So I need a few beta testers to confirm this all works. Interested parties should email me and I'll send them a VM, also people willing to compile and cross-check the c code for issues are welcome. Although the task sounds simple, open an image, open a file, delete a file, navigate to a directory, create a directory, delete a directory it's actually more complex because of all the other things you can do: At application startup a) We load an image based on command line startup b) We load an image based on XML specification c) We load an image from the bundle resource folder, using XML specification for name if needbe d) We load an image based on AppleEvent open application (the default from XML specification00 e) We load an image in another application based on the open document request to a running VM. f) We load an image based on doubling clicking an image with no VM running This should work on a folder name with unicode characters (accented or Japanese), and with a path with say three levels of alias indirection which normally defeats the casual implementation of alias resolving. This of course is an interesting place because normalization of unicode must occur between mac roman and utf-8 and hfs+ volume needs, plus we do multiple aliases resolutions. Other things Navigation in the file list to a folder/file in an interesting place with three levels of folder alias indirection plus unicode characters. Operations like read/write on a file, or creating or deleting the file in interesting places. Confirm file information for aliases files in navigation window is correct. Operations like deleting or creating a folder or an using/deleting an aliased folder. {I'll note we need to resolve how deleting an aliased folder works, does that mean delete the target folder or just the alias?} Drag and drop of files from interesting places. (indirection aliases) Loading a plugin from (vm directory, vm/plugins, vm bundle/resources folder) and perhaps as an alias (not tested) resolving the download folder via the internet config plugin (not tested) resolving the secure and unsecure pathnames in the security plugin setting and getting the finder creator and type codes for a file Switching to UTF-8 verses mac roman for internal vmpath support for all of above (not tested ). As you can see there is a lot of work to cross check all these features work, and perhaps ones I've not thought of. Pending is a rework of the mpeg plugin to use the VM file name translation api to make a proper file name for opening, that also applies to some other special purpose plugins we have. -- ======================================================================== === John M. McIntosh <johnmci(a)smalltalkconsulting.com> 1-800-477-2659 Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com ======================================================================== ===

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(newbie) String / Array / ArrayedCollection
by nicolas cellier 06 Feb '06

06 Feb '06

Hello all, I bounce on your example because i feel more concerned about arithmetic. Primary interest of implementing a #sum #product #min #max #cumulativeSum etc.. method in collection of numbers is the possibility to optimize some of these messages at the VM level. That's getting important when you have millions of numbers to crunch... Suppose now you want the sum of squares: (aCollection collect: [:element | element squared]) sum. Of course better code it in a single loop: aCollection inject: 0 into: [:sum :element | sum + element squared]. It does also work with fold: i presume. But i personnally prefer the more legible: aCollection sum: [:element | element squared] or maybe: aCollection sumOf: [:each | each squared] You can also have the productOf: minOf: maxOf: cumulativeSumOf: cumulativeProductOf: and get something powerfull... If and only if you have optimized primitives, you'd better operate on collections and have no loop at all in Smallatlk (at the expense of a memory allocation and two loops in C code however), this is exactly how matlab works: (aCollection*aCollection) sum In my opinion, messages without a block argument are necessary for optimization purposes in a matlab like environment. Messages with block arguments, though not strictly necessary knowing fold: and inject:into:, would ease implementation and code understanding of matrices and polynomials for example. To me they seem obvious extensions. I already proposed all that to VisualWorks NumericalCollections package. (Cincom Public Store). I also proposed the #count: extension. aCollection count: [:each | each > 1] does answer the number of elements satisfying a condition (I feel countSatisfy: is a little heavy). That is usefull more than rarely i think. What is your opinion ?

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REMINDER: Squeak Chat Tuesday February 7th 04:00 GMT
by Ken Causey 06 Feb '06

06 Feb '06

Just a reminder that the next Squeak Chat will take place between 04:00 (4 AM) and 08:00 (8 AM) GMT Tuesday February 7th, 2006. As usual we will meet in #squeak on irc.freenode.net. More information about the #squeak IRC channel can be found at http://people.squeakfoundation.org/article/7.html This is a good time to contribute to the development of Squeak by participating in the Harvesting Process. One of the main ways to contribute is by Reviewing submitted fixes and enhancements. For information about the Harvesting Process see http://minnow.cc.gatech.edu/squeak/3152 If you have the time please attend and work toward the future of Squeak. The next seven chats are scheduled for 08:00 (08:00 AM) GMT Saturday February 11, 2006 12:00 (12:00 PM) GMT Wednesday February 15, 2006 16:00 (04:00 PM) GMT Sunday February 19, 2006 20:00 (08:00 PM) GMT Thursday February 23, 2006 00:00 (12:00 AM) GMT Tuesday February 28, 2006 04:00 (04:00 AM) GMT Saturday March 04, 2006 08:00 (08:00 AM) GMT Wednesday March 08, 2006

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is the minnow swiki down?
by Michael Kohout 06 Feb '06

06 Feb '06

I can't seem to access the swiki. Some type of Superbowl-oriented downtime? the message I'm receiving is: You are unauthorized to access this site. thanks, Mike Kohout

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Re: Truncation and round off
by Peace Jerome 06 Feb '06

06 Feb '06

Hi Stef, Its currently a work in progress. More study. More analysis and code tracing. I was very pleased when I found this simply because its a good bug find. So I posted it to mantis along with others that deal with the same can of worms. Squeak actually has two different types of rounding problems. This one and then a general tendency for people to prematurely round SOURCE rectangles. Since these are deep in the guts of what lets squeak draw, caution is called for. The user story I've be working on is that Morphs should be beautiful and as their creator intended them to look; draw themselves fully and stably and not leave glitches when they move. For this one the solution lies in using floor and ceiling and what I call encompassed and compressed on rectangles. Or maybe as Andreas mentioned focusing on the extent point of the rectangle. The question is in the code where is it appropriate to use which method. If the opprotunity of the other post hadn't come up, I would have waited before posting this to squeakdev. I encourage and brave bug trackers who look into this to post their findings to the mantis list. >Truncation and round off >stéphane ducasse ducasse at iam.unibe.ch >Sun Feb 5 14:09:10 CET 2006 wrote: > >------------------------------------------------------------------------ > >Hi jerome > >do you have solutions for the problem you mention? > >Stef > >On 5 févr. 06, at 04:05, Peace Jerome wrote: > >> In >> >> http://lists.squeakfoundation.org/pipermail/squeak-dev/2006- >> February/100365.htmlnicolas >> >> >> nicolas cellier ncellier at ifrance.com wrote >> Sun Feb 5 02:00:17 CET 2006 >> >> at length about truncation and roundoff libraries and >> that squeak's is incomplete compared with others. >> >> I'd like to add that this incompleteness is part of a >> problem morphic has in displaying graphics. See: >> >> http://bugs.impara.de/view.php?id=2453 >> >> Summary 0002453: >> [Bugs] What is the extent of a truncated rectangle? >> >> The basic problem was that truncation and rounding did >> not mix well with rectangles. Particularly when >> rectangels were mixing with rendering Transformation >> morphs. >> >> Part of the solution would be to have more choices >> particular ceiling and floor options for rectangles >> (an by extention Points.) I was headed in that >> direction as I attempted fixes to the errors. If a >> set of vocabularies exist that would also make squeak >> more compatable with other smalltalks and we have all >> the necessary permissions to include them. Then I say >> squeak could use them. The sooner the better. >> >> >> Yours in service, -- Jerome Peace >> __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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