Squeak-dev December 2000

squeak-dev@lists.squeakfoundation.org

96 participants
272 discussions

Unix squeak under Unix VNCserver connected to Mac VNC client
by merlyn＠stonehenge.com 27 Dec '00

27 Dec '00

So, I want to run a swiki on my ISP's box. No big deal... I figured out how to do it two weeks ago under Unix when I was sitting at the desktop. But now I'm remote, so I've got to run with a long neck ("head" in different place from "body" :). I don't have much experience with VNCserver, but I figured out enough to make it start in 32 bit mode. Launches the default twm (with no manpage installed locally, ugh). And I don't have much experience with the two Mac VNCclients, except that I've connected to the server a few times as a proof of concept, and when I wanted to run this X thingy once. :) So, the VNCclient I used mapped option to middle button, and command to right button. I managed to launch squeak, but then any use of middle button iconified my squeak window! (I think that was twm interfering.) But I figured out that shift-middle button could at least get me to some of the menus, and wasn't being intercepted. I filed in the swiki-comanche filein, saying "yes, go ahead and patch Process". (I've done this on my mac, so I knew what to expect locally.) But then it got harder. I'm used to typing Command-B for browse and Command-Z for undo on my mac Squeak. But obviously on Unix (even virtually under the server), there's no "command" key, so what are the equivalent keystrokes under Unix, and how can I type these through? And how could I have known this without asking y'all? :) And if anyone's already done this under VNC, can someone give me some tips? I'd be happy to summarize what I find out and put it on the Squeak swiki. (And they say I'm a pretty good writer, so it should at least be spelled accurately. :) It's too bad I can't just launch a nebraska server headless. :( -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 <merlyn(a)stonehenge.com> <URL:http://www.stonehenge.com/merlyn/> Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!

3 2

Re: making more instances of objects in scripting
by Karl Ramberg 26 Dec '00

26 Dec '00

Alan Kay wrote: > > Bob and Karl -- > > One suggestion is to always use "increaseBy" (found by clicking on > the carets in the "<-" tile). Found it. Lots of power under the hood here. I also located the dot menu, thanks Joshua. This allows you to say: > > ship's x increaseBy ship's velocityx > > instead of > > ship's x <- ship's x + ship's velocityx > > The former illuminates the accumulation, and also gives the kids the > term "increaseBy" as the name for a very powerful idea, that can be > used in animation (holder's cursor increaseBy 1), sampling synthesis > (same expression), etc. Two levels of this gives a nice way to think > about accelleration (in the spatial world) and about FM synthesis (in > the acoustic world). This sounds cool. It could be like a mission control center and have lots of related data presented, and possibilites to remote control the ship that way. > > It is also worthwhile to go further in making programs like this > understandable, e.g. it's pretty easy to use a player on a small > playfield to show the direction and magnitude of the velocity and > accelleration -- that is, we are now using a player on its own > playfield (set the preference under the playfield's menu to "0 at > center", etc.) as a vector value that can display itself. Then you > can take the increments for moving the ship from these vector values, > etc., AND the kid can see the dynamic state of the ship. > > With the right kind of wraparound, an "F = ma" game like this will > work pretty well when shared over the net .... > > The first addon modifications at MIT were, first, the starfield > (slowly rotating as I recall ...?), and then a sun to add a little > inverse square law to the fun. These can be done geometrically > without introducing Trig as a direct concept (heh heh). > Bob and I did several versions of a sun and a planet in the > Etoy system, and I think at least one of these is on his > "SuperSwiki"..... Yes I had a look at it. I'm still just in the starting faces with the scripting system, but it is really powerfull. It has a quite stiff learing curve but it's also rewarding in flexibility and power. I find myself going: aha, that's how it's done ! every ten minutes. Karl > > Cheers, > > Alan > > ------- > > At 11:12 AM -0500 12/26/00, Bob Arning wrote: > >On Tue, 26 Dec 2000 13:44:59 +0100 Karl Ramberg > ><karl.ramberg(a)chello.se> wrote: > >>Anyway, the project is at Bobs SuperSwiki, > >>http://209.143.91.36/super/ , it's called SpaceWar. > >>Best accessed with a 2.9a image and either the FileList or > >>the ProjectNavigatorMorphs Find button. > >>It would be cool if you or anybody messed around with it :-) > >>There is lots of issues about the scripting I don't > >>know about, and I find the easiest way to learn is > >>to seeing how it's done. > > > >Karl, > > > >I suspect we are all in a learning mode here. I put a modified > >version out as SpaceWarBob. See if you find any of it an > >improvement. ;-) > > > >Cheers, > >Bob

1 0

Re: making more instances of objects in scripting
by Bob Arning 26 Dec '00

26 Dec '00

On Tue, 26 Dec 2000 13:44:59 +0100 Karl Ramberg <karl.ramberg(a)chello.se> wrote: >Anyway, the project is at Bobs SuperSwiki, >http://209.143.91.36/super/ , it's called SpaceWar. >Best accessed with a 2.9a image and either the FileList or >the ProjectNavigatorMorphs Find button. >It would be cool if you or anybody messed around with it :-) >There is lots of issues about the scripting I don't >know about, and I find the easiest way to learn is >to seeing how it's done. Karl, I suspect we are all in a learning mode here. I put a modified version out as SpaceWarBob. See if you find any of it an improvement. ;-) Cheers, Bob

2 1

making more instances of objects in scripting
by Karl Ramberg 26 Dec '00

26 Dec '00

Hi I'm trying to make a SpaceWar game a la the one Alan Kay describes in How Spacewar on Bobs SuperSwiki. I'm doing this with morphic scripting tiles and wonder how to make bullets. I would like to make one bullet and every time one is fired the original bullet will copy it self and the copy will shoot off. But I can't find a way to make a copy instance of a bullet... Any suggestions ? Karl

3 4

Re: making more instances of objects in scripting
by Bob Arning 25 Dec '00

25 Dec '00

On Mon, 25 Dec 2000 17:48:11 +0100 Karl Ramberg <karl.ramberg(a)chello.se> wrote: >I'm trying to make a SpaceWar game a la the one >Alan Kay describes in How Spacewar on Bobs SuperSwiki. >I'm doing this with morphic scripting tiles and wonder >how to make bullets. I would like to make one bullet >and every time one is fired the original bullet will >copy it self and the copy will shoot off. >But I can't find a way to make a copy instance of a >bullet... >Any suggestions ? Karl, Try editing a script textually and changint the text to script1 "<<---or whatever number it gives you" self costume owner addMorph: self costume usableSiblingInstance Cheers, Bob

1 0

Re: String literal at:put: question
by Bob Arning 25 Dec '00

25 Dec '00

On Mon, 25 Dec 2000 11:46:11 -0500 "Andrew C. Greenberg" <werdna(a)mucow.com> wrote: >>That has been the Smalltalk behavior since the dark ages... I presume >>the intention is to make it semantically similar to assignment >>expressions, whose value is equal to the assigned value. To achieve your >>intention, you should evalutae >> 'abcdef' >> at: 1 put: $x; >> yourself >>which returns the receiver of the first message expression. > >Right. Also, if it were otherwise, there would be no way to operate >on the expression for the put: operand. #yourself gives access to >the receiver, while the returned value gives access to the assigned >value. > >Why you would want this, rather than to assign the expression to a >temporary is beyond me, but hey, syntax like this is what makes >obfuscated code contests fun to enter! One reason is that it doesn't require a temporary, which helps keep the clutter down. Look, for instance at the implementation of #at:ifAbsentPut: at: key ifAbsentPut: aBlock "Return the value at the given key. If key is not included in the receiver store the result of evaluating aBlock as new value." ^ self at: key ifAbsent: [self at: key put: aBlock value] which, if #at:put: returned the receiver rather than the second argument, would become at: key ifAbsentPut: aBlock "Return the value at the given key. If key is not included in the receiver store the result of evaluating aBlock as new value." | blockResult | ^ self at: key ifAbsent: [self at: key put: (blockResult _ aBlock value). blockResult] I know which one I perfer. ;-) Cheers, Bob

1 0

String literal at:put: question
by Avi Schwartz 25 Dec '00

25 Dec '00

Hi, I am new to Smalltalk and Squeak, so please bear with me... I am trying to figure out why the result of 'abcdef' at: 1 put: $x is $x and not 'xbcdef'. I assume that the Squeak result correct since VisualWorks returns the same. But the question is why? Now, to complicate matters even worse for me, according to the book 'Smalltalk, Objects, and Design' by Chamond Liu, the result I should expect is an exception since a string literal is immutable. I'd appreciate an explanation or a pointer to one Thanks, Avi -- Avi Schwartz Get a Life avi(a)CFFtechnologies.com Get Linux

3 2

Re: Advice on squeaklets needed
by Bert Freudenberg 24 Dec '00

24 Dec '00

On Fri, 22 Dec 2000, Karl Ramberg wrote: > With 2.9 progressing and lots of stuff happening to projects etc > I think a merge between squeaklets (sts) and projects (pr) would be > nice. > Or is it stuff the sts files does that pr can't ? You're basically right in saying "a Squeaklet is a Project". The business with sts-files is that these are tiny loader snippets that load the actual content. You gain flexibility by this, and also speed: projects tend do be largish in file size, compared to a few hundred bytes loader snippet. You can, for example, pop up a little notifier while downloading the file. However, we might consider extending the startup logic to automatically jump to the project when an image segment containing such is loaded. That would allow making Squeaklets without a sts-loader file. Do we want to have a new MIME-type "application/x-squeak-project" then? -- Bert

2 1

Invalidations and Re: AlternativeDamageRecorder or: A simpler mouse trap?
by danielv＠netvision.net.il 23 Dec '00

23 Dec '00

Sorry, forgot to mention this - BouncingAtomsMorph has an optimization that masks the difference. I guess it's pretty old, being superflous even with the current methods. Change to false: invalidRect: damageRect from: aMorph ... quickRedraw _ true. "false gives the original invalidRect: behavior" BTW, I noticed this has interesting behavior with the Halos, too. Try to guess what it is before you try it... Andreas - I noticed that world halos always invalidate the world, and traced this to CS 2957. One of the offenders is - Morph>>addMorph:inFrontOf: ... self isInWorld ifTrue:[self invalidRect: newMorph fullBounds from: newMorph]. removing that line fixed adding the halos, but removing them still has the undesired effect. Is this simply not uptodate or something? seems superflous because any morph added should know to invalidate itself, no? Doug Way <dway(a)riskmetrics.com> wrote: > > danielv(a)netvision.net.il wrote: > > > > "Change Set: AlternativeDamageRecord > > Date: 23 December 2000 > > Author: Daniel Vainsencher > > > > Uses alternative heuristic for recording damage - > > for any new damage (that isn't completely contained by the old damage), > > compare the costs of drawing it and each existing rect to the cost of > > drawing them merged. If a merge with any is cheaper, merge them, and run > > the same test on the new area. The approximation of costs use shoud > > handle many cases well that previously required special attention. Test > > with bouncing atoms, see them cluster."! > > Sounds like a good idea. But I tried filing this into a 2.9alpha-3144 > image (with debugShowDamage turned on), and the entire bouncing atoms > morph always seemed to blink... I didn't see any clustering, even if I > played around with resizing the morph. > > - Doug Way > dway(a)riskmetrics.com

3 2

AlternativeDamageRecorder or: A simpler mouse trap?
by danielv＠netvision.net.il 23 Dec '00

23 Dec '00

"Change Set: AlternativeDamageRecord Date: 23 December 2000 Author: Daniel Vainsencher Uses alternative heuristic for recording damage - for any new damage (that isn't completely contained by the old damage), compare the costs of drawing it and each existing rect to the cost of drawing them merged. If a merge with any is cheaper, merge them, and run the same test on the new area. The approximation of costs use shoud handle many cases well that previously required special attention. Test with bouncing atoms, see them cluster."!

1 0

← Newer
1
2
3
4
5
6
7
8
...
28
Older →

Jump to page: