Squeak-dev March 2006

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177 participants
255 discussions

Fraction equality and Float infinity problem
by nicolas cellier 28 Mar '06

28 Mar '06

Large Fraction asFloat do overflow and answer Float infinity. ((11 raisedTo: 400) / 2) asFloat = Float infinity. "is true" So far, nothing wrong, except i prefer exception, but that was another discussion. But then they also equal Float infinity, and that sound strange to me: ((11 raisedTo: 400) / 2) = Float inifinity. "is true" What is bad in this behavior ? It is that you don't have equality transitivity property any more, and that is a flaw: ((11 raisedTo: 400) / 2) = Float inifinity. "is true" ((13 raisedTo: 400) / 2) = Float inifinity. "is true" ((11 raisedTo: 400) / 2) = ((13 raisedTo: 400) / 2). "is false" Then you can expect very weird bugs again in Sets. Add these 3 objects to a Set. Since transitivity is broken, the size of the set will vary according to the order you will add objects to it, the hash code algorithm and the set capacity. Something very nasty. Sure, few people use Large Fractions, and knowing this, they'd rather not, but this is not the right argument. Also, the hash correction i'am proposing is likely to make things worse. So we have to fix this one. Any idea but testing for infinity in adaptToFraction:andSend: / adaptToFloat:andSend: ? This is another reason why i really prefer arithmetic exceptions: handle such case. But i cannot move to arithmetic exception alone.

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[ANN] 3.9a7021
by Marcus Denker 28 Mar '06

28 Mar '06

http://ftp.squeak.org/3.9alpha/Squeak3.9a-7021.zip CHANGELOG ============ - 0003215: saving and reloading a string morph with a true type font breaks the font - 0003354: Can't select some colors in PaintBoxColorPicker - 0003355: [BUG] Fresh 3.9a image (build 7020) has text morphs in objects window wrong size - added CollectionsTests from stef - OmniBrowser (fixed by Lukas) - makes it possible to drag meta-classes to new categories - add missing OBClassActor to OBMetaclassNode - fix as published in http://bugs.impara.de/view.php?id=3269 - fix a debugger when selecting omnibrowser as default browser - made the buttons in omnibrowser look like they do in 3.9 - fixes an infinite recursion occuring when a drag&drop operation is started - fix for the SlowRedraw bug (Adrian) - valueWithExit for BlockContex / BlockClosure - added Symbol>>#value: ------- Change Set: SuperSwikiFixKR Date: 20 February 2006 Author: Korakurider A one-method fix to the recent SuperSwikiStr update. ------- Change Set: TTCFont-fix-ascent-jrp Date: 27 March 2006 Author: John Pierce Add ascent instance variable back to the class so method ascent will work again.

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BUG asFraction
by nicolas cellier 28 Mar '06

28 Mar '06

as explicitly stated in Float>>#asTrueFraction comment "(Does not handle gradual underflow or NANs.)" Well, then maybe i'll get a debugger opened... 1.0e-316 asFraction asFloat. "will answer 1.1125369342536e-308" ouch! as stated in comment... This is http://bugs.impara.de/view.php?id=3373 Nicolas

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RE: Graphical Display of 100,000 objects
by Nicholas Bennett 28 Mar '06

28 Mar '06

hans, I had played around with http://www.cosmocows.com/OpenGL/ which gives a foreign function interface to wrapper on the opengl dlls under windows. They have a 'full world window' car game, but under that there is a straight binding to a subset of the opengl functions. I had wanted to learn a little 'raw' opengl so this was perfect for me. It's a little fussy due to dll versions etc; on my old win98 it crashes, on one of my xp machines it insists on updating the entire world window - but generally I can have an 'opengl morph' that open gl renders to and regular morphs for controls etc. I had no trouble extending the function coverage to support opengl 'picking' etc. The nice thing is that you can have quite a large area rendering many frames / second with low cpu usage. I can give you more info if it is interesting for you. regards, nicholas >From: "Baveco, Hans" <Hans.Baveco(a)wur.nl> >Reply-To: The general-purpose Squeak developers >list<squeak-dev(a)lists.squeakfoundation.org> >To: "The general-purpose Squeak developers >list"<squeak-dev(a)lists.squeakfoundation.org> >Subject: RE: Graphical Display of 100,000 objects >Date: Tue, 28 Mar 2006 11:18:43 +0200 > >Mart-Mari, >It would really be interesting to hear a bit more about how you did this >visualization with OpenGL. Did you use a Croquet image for this? > >Hans > >-----Original Message----- >From: Mart-Mari Breedt [mailto:breedt_m@aircom.co.za] >Sent: dinsdag 28 maart 2006 7:22 >To: The general-purpose Squeak developers list >Subject: RE: Graphical Display of 100,000 objects > >Hallo, > >I had a similar problem once - I had to code an ACO (Ant Colony >Optimization) solution that had a graphical component showing the Ants >walking along the various routes and then finding the best route. I used >OpenGL for the graphical part and it worked great! > >Kind regards, > >Mart-Mari > >-----Original Message----- >From: Yoshiki Ohshima [mailto:yoshiki@squeakland.org] >Sent: 28 Maart 2006 01:19 >To: The general-purpose Squeak developers list >Subject: Re: Graphical Display of 100,000 objects > > Ron, > > > I saw it but wasn't sure how difficult it would be to plug it in, and >I was > > wondering if it was overkill, holding simulation functionality, when I > > > already have objects doing the work. > > What do you mean by "plug it in"? Even you don't do the tile >scripting, it should be much, much easier than "plug Open GL in". > >-- Yoshiki > > > > >

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RE: Graphical Display of 100,000 objects
by Mart-Mari Breedt 28 Mar '06

28 Mar '06

Hallo, I had a similar problem once - I had to code an ACO (Ant Colony Optimization) solution that had a graphical component showing the Ants walking along the various routes and then finding the best route. I used OpenGL for the graphical part and it worked great! Kind regards, Mart-Mari -----Original Message----- From: Yoshiki Ohshima [mailto:yoshiki@squeakland.org] Sent: 28 Maart 2006 01:19 To: The general-purpose Squeak developers list Subject: Re: Graphical Display of 100,000 objects Ron, > I saw it but wasn't sure how difficult it would be to plug it in, and I was > wondering if it was overkill, holding simulation functionality, when I > already have objects doing the work. What do you mean by "plug it in"? Even you don't do the tile scripting, it should be much, much easier than "plug Open GL in". -- Yoshiki

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WATree with horizontal scroll bar
by Dario Trussardi 28 Mar '06

28 Mar '06

Hello All, i work with VW 7.4 and i'am new to seaside. My question is: is possibol to work with WATree not expanded all on the page, but in a "treeView list " with horizontal scroll bar ? Thanks & Regards, Dario Trussardi Romano

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Re: hash and equal problem
by nicolas cellier 28 Mar '06

28 Mar '06

So i think i should proceed with VW latter solution: Rationale: Turning Float hash to Fraction hash really spoils things (factor 100) : Time millisecondsToRun: [10000 timesRepeat: [Float pi asFraction hash]]. 1217 Time millisecondsToRun: [10000 timesRepeat: [Float pi hash]]. 13 But turning Fraction hash to Float hash does harm less (factor 10): | tmp | tmp := Float pi asFraction. Array with: (Time millisecondsToRun: [10000 timesRepeat: [tmp hash]]) with: (Time millisecondsToRun: [10000 timesRepeat: [tmp asFloat hash]]) #(47 339) This first naive implementation does not handle large fractions well (all have same Float infinity hash), but this can be fixed later (since they do not equal... but wait, wait, they equal ! arghh see another bug in next mail). Nicolas Le Mardi 28 Mars 2006 10:51, vous avez écrit : > Nicolas > > thanks! > My question was also more interested :) > If you want to see this bug to be fixed, submit a fix and a bunch of > tests :). > You look like that right guy to do that :) > > Stef

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RE: Graphical Display of 100,000 objects
by Mart-Mari Breedt 28 Mar '06

28 Mar '06

Hi Hans, Unfortunatly it was nothing so fancy. I basically had a C++ program that contained classes definitions for the various objects and the OpenGL (in C) component interfaced with this. So my problem was probadly a lot simpler than your scenario because interfacing to the GUI component was not that difficult. If you are really keen, I can dig up the code I wrote way-back-then and send it to you. Kind regards, Mart-Mari -----Original Message----- From: Baveco, Hans [mailto:Hans.Baveco@wur.nl] Sent: 28 Maart 2006 11:19 To: The general-purpose Squeak developers list Subject: RE: Graphical Display of 100,000 objects Mart-Mari, It would really be interesting to hear a bit more about how you did this visualization with OpenGL. Did you use a Croquet image for this? Hans -----Original Message----- From: Mart-Mari Breedt [mailto:breedt_m@aircom.co.za] Sent: dinsdag 28 maart 2006 7:22 To: The general-purpose Squeak developers list Subject: RE: Graphical Display of 100,000 objects Hallo, I had a similar problem once - I had to code an ACO (Ant Colony Optimization) solution that had a graphical component showing the Ants walking along the various routes and then finding the best route. I used OpenGL for the graphical part and it worked great! Kind regards, Mart-Mari -----Original Message----- From: Yoshiki Ohshima [mailto:yoshiki@squeakland.org] Sent: 28 Maart 2006 01:19 To: The general-purpose Squeak developers list Subject: Re: Graphical Display of 100,000 objects Ron, > I saw it but wasn't sure how difficult it would be to plug it in, and I was > wondering if it was overkill, holding simulation functionality, when I > already have objects doing the work. What do you mean by "plug it in"? Even you don't do the tile scripting, it should be much, much easier than "plug Open GL in". -- Yoshiki

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Connectors help...
by Elod Kironsky 28 Mar '06

28 Mar '06

Hi! I would need some help with the Connectors package. My problem is, that I need to define a custom menu for the end of the connectors. More specifically, I need those ends (NCLineEndConstraintMorph) to react on pressing the yellow button and redirect the event to the morph they are connected to. I tried to figure out, how connectors handles events, but it seems so, that it is using event handlers and I am not very experienced with those. Thank for your help in advance, Elod

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RE: Graphical Display of 100,000 objects
by Baveco, Hans 28 Mar '06

28 Mar '06

Mart-Mari, It would really be interesting to hear a bit more about how you did this visualization with OpenGL. Did you use a Croquet image for this? Hans -----Original Message----- From: Mart-Mari Breedt [mailto:breedt_m@aircom.co.za] Sent: dinsdag 28 maart 2006 7:22 To: The general-purpose Squeak developers list Subject: RE: Graphical Display of 100,000 objects Hallo, I had a similar problem once - I had to code an ACO (Ant Colony Optimization) solution that had a graphical component showing the Ants walking along the various routes and then finding the best route. I used OpenGL for the graphical part and it worked great! Kind regards, Mart-Mari -----Original Message----- From: Yoshiki Ohshima [mailto:yoshiki@squeakland.org] Sent: 28 Maart 2006 01:19 To: The general-purpose Squeak developers list Subject: Re: Graphical Display of 100,000 objects Ron, > I saw it but wasn't sure how difficult it would be to plug it in, and I was > wondering if it was overkill, holding simulation functionality, when I > already have objects doing the work. What do you mean by "plug it in"? Even you don't do the tile scripting, it should be much, much easier than "plug Open GL in". -- Yoshiki

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