March 2016 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Roassal2 on Ubuntu 64

by Peter UhnÃ¡k

> > I'm looking at the dependencies of pharo-launcher on ubuntu, and I don't > see any dependency on libcairo2:i386. It's a Cairo dependency, not necessarily Pharo's dependency â i.e. you can use Pharo for a long time and never need cairo. For a smother Gnu/Linux experience, the message could be a little bit more > descriptive, something advicing to check for LibCairo 32 bit in the system > and installing it, if it is not present. Well the error does say 'Cannot locate cairo library. Please check if it installed on your system', and from the paths it's checking its pretty clear what it needs. So if you are a linux user it's more than enough to see what's going on/what's needed. And if you are not a linux user, then anything short of exact instructions how to install it would be imho equally useless. I have been thinking in some kind of interface with the Nix package > manager[2] Because what's better than telling users how to install a package in a particular distro? Tell them how to install a whole new package manager in their particular distro and then tell them how to install a package. We can also go all the way and just bundle all the libraries and have option to download "self-contained linux vm" (this is what I've actually done for one of my projects, because the users didn't have root privilege to install new packages on the computers). On Thu, Mar 10, 2016 at 3:31 PM, Offray Vladimir Luna CÃ¡rdenas < offray.luna(a)mutabit.com> wrote: > Evan, > > We had this problem in every Data Week workshop. Is just matter of > installing the libcairo 32 bits package for your Linux distro. In the case > of ubuntu, you could adapt instructions at [1]. For a smother Gnu/Linux > experience, the message could be a little bit more descriptive, something > advicing to check for LibCairo 32 bit in the system and installing it, if > it is not present. About multi-unix package installation support, I have > been thinking in some kind of interface with the Nix package manager[2], so > when something is not there, Pharo could offer automatic installation. > > [1] > http://askubuntu.com/questions/107230/what-happened-to-the-ia32-libs-package > [2] http://nixos.org/nix/ > > Cheers, > > Offray > > > On 10/03/16 09:12, Peter UhnÃ¡k wrote: > > On Thu, Mar 10, 2016 at 3:01 PM, Alexandre Bergel < > <alexandre.bergel(a)me.com>alexandre.bergel(a)me.com> wrote: > >> Evan, let us know how it goes! This is important to understand whatâs >> going on >> > > Well this is well-known thing. Pharo is 32bit only, so all libraries have > to be also. > > But maybe it could be mentioned just-in-case somewhere on the website, and > ways how to install it on linux (i.e. what command should the linux user > execute in his particular distro, e.g. apt-get install libcairo2:i386 on > debian/ubuntu, XYZ on Arch linux, etc.)? > > For both Windows and Mac the cairo library is bundled with the VM, but in > linux it's a bad practice and package manager should be used instead to > install the packages (on linux it's actually 6 libraries, but package > manager handles the dependencies automatically). > > Peter > > >

March 10, 2016

Re: [Pharo-users] Roassal2 on Ubuntu 64

by Offray Vladimir Luna CÃ¡rdenas

Evan, We had this problem in every Data Week workshop. Is just matter of installing the libcairo 32 bits package for your Linux distro. In the case of ubuntu, you could adapt instructions at [1]. For a smother Gnu/Linux experience, the message could be a little bit more descriptive, something advicing to check for LibCairo 32 bit in the system and installing it, if it is not present. About multi-unix package installation support, I have been thinking in some kind of interface with the Nix package manager[2], so when something is not there, Pharo could offer automatic installation. [1] http://askubuntu.com/questions/107230/what-happened-to-the-ia32-libs-package [2] http://nixos.org/nix/ Cheers, Offray On 10/03/16 09:12, Peter UhnÃ¡k wrote: > On Thu, Mar 10, 2016 at 3:01 PM, Alexandre Bergel > <alexandre.bergel(a)me.com <mailto:alexandre.bergel@me.com>> wrote: > > Evan, let us know how it goes! This is important to understand > whatâs going on > > > Well this is well-known thing. Pharo is 32bit only, so all libraries > have to be also. > > But maybe it could be mentioned just-in-case somewhere on the website, > and ways how to install it on linux (i.e. what command should the > linux user execute in his particular distro, e.g. apt-get install > libcairo2:i386 on debian/ubuntu, XYZ on Arch linux, etc.)? > > For both Windows and Mac the cairo library is bundled with the VM, but > in linux it's a bad practice and package manager should be used > instead to install the packages (on linux it's actually 6 libraries, > but package manager handles the dependencies automatically). > > Peter

March 10, 2016

Re: [Pharo-users] Roassal2 on Ubuntu 64

by Thierry Goubier

2016-03-10 15:12 GMT+01:00 Peter UhnÃ¡k <i.uhnak(a)gmail.com>: > On Thu, Mar 10, 2016 at 3:01 PM, Alexandre Bergel <alexandre.bergel(a)me.com > > wrote: > >> Evan, let us know how it goes! This is important to understand whatâs >> going on >> > > Well this is well-known thing. Pharo is 32bit only, so all libraries have > to be also. > Well, maybe there is something to check there. I'm looking at the dependencies of pharo-launcher on ubuntu, and I don't see any dependency on libcairo2:i386. > > But maybe it could be mentioned just-in-case somewhere on the website, and > ways how to install it on linux (i.e. what command should the linux user > execute in his particular distro, e.g. apt-get install libcairo2:i386 on > debian/ubuntu, XYZ on Arch linux, etc.)? > > For both Windows and Mac the cairo library is bundled with the VM, but in > linux it's a bad practice and package manager should be used instead to > install the packages (on linux it's actually 6 libraries, but package > manager handles the dependencies automatically). > Oh, ok, maybe there is something (at least on Ubuntu) : pharo-launcher depends on pharo-vm-core-i386, which depends on all expected libs except libcairo2: $ apt-cache depends pharo-vm-core-i386 pharo-vm-core-i386:i386 DÃ©pend: libasound2:i386 DÃ©pend: libc6:i386 DÃ©pend: libfreetype6:i386 |DÃ©pend: libgl1-mesa-glx:i386 DÃ©pend: <libgl1:i386> libgl1-mesa-glx:i386 DÃ©pend: libssl1.0.0:i386 DÃ©pend: libx11-6:i386 SuggÃ¨re: pharo-vm-desktop:i386 SuggÃ¨re: <pharo-launcher:i386> Recommande: pharo-vm-core:i386 pharo-vm-core suggest pharo-vm-desktop, and pharo-vm-desktop only recommand libcairo2 ? $ apt-cache depends pharo-vm-desktop pharo-vm-desktop:i386 DÃ©pend: libc6:i386 DÃ©pend: libfreetype6:i386 |DÃ©pend: libgl1-mesa-glx:i386 DÃ©pend: <libgl1:i386> libgl1-mesa-glx:i386 DÃ©pend: libx11-6:i386 DÃ©pend: pharo-vm-core:i386 Recommande: libcairo2:i386 So, maybe we need to change the dependencies then ? Thierry > Peter >

March 10, 2016

Re: [Pharo-users] [Moose-dev] RTAnchorConstraint

by Johan Fabry

> On Mar 9, 2016, at 18:51, Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > > > > On Wed, Mar 9, 2016 at 10:02 PM, Johan Fabry <jfabry(a)dcc.uchile.cl <mailto:jfabry@dcc.uchile.cl>> wrote: > Heh, also a funny feature of your anchor constraints: they do not play well with layouts and animations. Try the code below (adapted from the example to use the layout and animation of LRP ) and you will see that the circles keep spinning around, they never stop. I think it would be better for them to stop ;-) > > can't help myself :) > > https://youtu.be/PGNiXGX2nLU?t=1m <https://youtu.be/PGNiXGX2nLU?t=1m> Hehe, good one :-) https://youtu.be/uo0o8eQWfcI ! :-P > > stepping := RTSpringLayoutStepping new > view: v; layout: layout; > afterBlock: [ v canvas camera focusOnCenter]. > > The problem is that RTSpringLayoutStepping>>view sets in effect the layout on all elements in the view, which obviously won't work since they'll start competing. > > I'm not sure right now how to address it, but try this > > stepping := RTSpringLayoutStepping new > view: RTView new; layout: layout; > nodes: es; > afterBlock: [ v canvas camera focusOnCenter]. Sorry, I donât know enough of the internals to understand whatâs going on. The solution is not a solution for me, because it effectively removes the animation, we only see the the resulting layout. There is no other solution? Alex, do you have any idea? > Ah right, thanks. I've extracted the class from my code and I have different removal mechanism... > Please try the latest version, it should be fixed there. Fixed, thanks! But now there is a new bug RTAnchorConstraint>>computeExtraDistance that I cannot reliably reproduce, I only have a stack trace, sorry: Array(Object)>>errorSubscriptBounds: Array(Object)>>at: Array(SequenceableCollection)>>first Array(SequenceableCollection)>>anyOne Array(Collection)>>max RTAnchorConstraint>>computeExtraDistance [ :crossings | element translateBy: aSegment vector normal * (minDistance + self computeExtraDistance) negated ] in RTAnchorConstraint>>moveAwayFromSegment: BlockClosure>>cull: Set(Collection)>>ifNotEmpty: RTAnchorConstraint>>moveAwayFromSegment: RTAnchorConstraint>>moveElement RTAnchorConstraint>>update [ self update ] in RTAnchorConstraint>>build BlockClosure>>cull: BlockClosure>>cull:cull: TRTranslationCallback>>shape:step: [ :c | c isTranslationCallback ifTrue: [ c shape: self step: aStep ] ] in TREllipseShape(TRCallableObject)>>triggerCallbacksForStep: OrderedCollection>>do: TREllipseShape(TRCallableObject)>>triggerCallbacksForStep: TREllipseShape(TRAbstractBoxShape)>>fromRectangle: TREllipseShape(TRAbstractBoxShape)>>fromRectangle:color: RTEllipse>>updateFor:trachelShape: RTEllipse(RTShape)>>updateFor: RTElement(RTShapedObject)>>update ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD and RyCh labs - Computer Science Department (DCC) - University of Chile

March 10, 2016

Re: [Pharo-users] [ARTICLE] Tiny, yet so beautiful

by Henrik Johansen

> On 10 Mar 2016, at 3:01 , Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > > "Nice article. But asBit has existed in @SqueakSmalltalk since at least 2004. Why not say so?" > https://twitter.com/bertfreudenberg/status/707922868273856512 <https://twitter.com/bertfreudenberg/status/707922868273856512> > > And indeed, in Pharo I see it added on 27.3. and 28.12.2012 (why almost a year difference?) > > And in Squeak I see it added 1.7.2004 (although they don't have it in Boolean class). > > The rest of the Boolean class looks pretty identical to the letter (including comments), so it makes one wonder why wasn't this copied over. > > Peter It was, the same version of asBit you find in Squeak was present in Pharo 1.4 and earlier. Though, uncategorized, and without the subclassResponsibility implementation on Boolean. 2.0 development was hectic, hard to tell if it was cleaned away and then re-added/invented ( I think it may have, I seem to remember it being an extension in NB for awhile) The source compaction that happened at 2.0 release removed any lingering traces of the old version, either way attributing Anthony Hannan as well wouldn't be entirely out of place. Either way, a beautiful bit of code! Cheers, Henry

March 10, 2016

Postdoc in Chile

by Alexandre Bergel

Hi! We have an opportunity for doing a postdoc in Chile, in the field of software engineering and/or data visualization. I could provide a lengthy description about living in Chile, and its fantastic food, latin atmosphere, and gorgeous nature. But I will surely be far from the truth. If you want to know more about this possibility, get in touch! Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

March 10, 2016

Re: [Pharo-users] Roassal2 on Ubuntu 64

by Peter UhnÃ¡k

On Thu, Mar 10, 2016 at 3:01 PM, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: > Evan, let us know how it goes! This is important to understand whatâs > going on > Well this is well-known thing. Pharo is 32bit only, so all libraries have to be also. But maybe it could be mentioned just-in-case somewhere on the website, and ways how to install it on linux (i.e. what command should the linux user execute in his particular distro, e.g. apt-get install libcairo2:i386 on debian/ubuntu, XYZ on Arch linux, etc.)? For both Windows and Mac the cairo library is bundled with the VM, but in linux it's a bad practice and package manager should be used instead to install the packages (on linux it's actually 6 libraries, but package manager handles the dependencies automatically). Peter

March 10, 2016

Re: [Pharo-users] [ARTICLE] Tiny, yet so beautiful

by Peter UhnÃ¡k

"Nice article. But asBit has existed in @SqueakSmalltalk since at least 2004. Why not say so?" https://twitter.com/bertfreudenberg/status/707922868273856512 And indeed, in Pharo I see it added on 27.3. and 28.12.2012 (why almost a year difference?) And in Squeak I see it added 1.7.2004 (although they don't have it in Boolean class). The rest of the Boolean class looks pretty identical to the letter (including comments), so it makes one wonder why wasn't this copied over. Peter On Thu, Mar 10, 2016 at 7:36 AM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > Thanks a lot, Ben, for your remarks; I applied them all. > > I am glad you liked the article. > > Sven > > > On 10 Mar 2016, at 01:21, Ben Coman <btc(a)openinworld.com> wrote: > > > > On Thu, Mar 10, 2016 at 6:05 AM, Sven Van Caekenberghe <sven(a)stfx.eu> > wrote: > >> > >> I wrote another article: > >> > >> Tiny, yet so beautiful > >> The smallest piece of great Pharo code > >> https://medium.com/concerning-pharo/tiny-yet-so-beautiful-1ef5149c910e > >> > > > > I love reading these articles of yours. Very well written. > > Feedback for some minor wordsmithing... > > > > - 2 out of 5 reserved words in the language.) > > + 2 out of _the_ 5 reserved words in the language.) _They are > > instances respectively of classes True and False, that have common > > superclass Boolean._ > > > > - where an identical message _results in_ different implementations > > + where an identical message _invokes_ different implementations > > > > - Manipulating objects using their API > > + Manipulating objects using their _pre-existing_ API > > > > - Switserland > > + Switzerland > > > > cheers -ben > > > > >

March 10, 2016

Re: [Pharo-users] Roassal2 on Ubuntu 64

by Alexandre Bergel

Evan, let us know how it goes! This is important to understand whatâs going on Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > On Mar 10, 2016, at 5:57 AM, Thierry Goubier <thierry.goubier(a)gmail.com> wrote: > > Hi Evan, Ben, > > I believe you need to install the 32 bits version of libcairo2, with for example > > $ sudo apt-get install libcairo2:i386 > > Regards, > > Thierry > > 2016-03-10 9:26 GMT+01:00 Ben Coman <btc(a)openinworld.com <mailto:btc@openinworld.com>>: > On Thu, Mar 10, 2016 at 3:19 PM, Evan Donahue <emdonahu(a)gmail.com <mailto:emdonahu@gmail.com>> wrote: > > Hello, > > > > I'm trying to learn Roassal, but I can't seem to get the first visualization > > from > > https://dl.dropboxusercontent.com/u/31543901/AgileVisualization/QuickStart/… <https://dl.dropboxusercontent.com/u/31543901/AgileVisualization/QuickStart/…> > > working on any combination of image and vm. I've tried the vm+40 and vm+50 > > from get.pharo and the moose 6.0 image from the moose site. > > > > The issue seems to be that CairoLibrary>>unixModuleName does not contain the > > /usr/lib/x86_64-linux-gnu/libcairo.so.2 path where 64-bit Ubuntu installs > > cairo. If I symlink that library, I get an Error: External module not found > > from AthensCairoSurface. I don't really know enough about the external > > module system to know what this is telling me. Any ideas would be much > > appreciated. > > > > Thanks, > > Evan > > Pharo 5 is only 32-bit, so cannot use the 64-bit Cario libraries. You > would need to install the 32 bit Cario libraries, I guess similar to > "Other" here... > http://pharo.org/gnu-linux-installation <http://pharo.org/gnu-linux-installation> > > cheers -ben > >

March 10, 2016

Re: [Pharo-users] Get the code of a method - Artefact

by Stephan Eggermont

On 10-03-16 11:14, Guillaume Ongenae wrote: > Hello, > > I'm a student at Lille 1 university, so I'm still a beginner in Pharo > > I'm working on Artefact to create a more understable and complete > demonstration. > Artefact the pdf library? Stephan

March 10, 2016