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Re: [Pharo-users] Pharo image processing library
by Pablo Navarro Jan. 26, 2020

Jan. 26, 2020

I'll work on those tests and then we'll do the subclass for image processing. :) I'm very happy to contribute to this project. Pablo. El dom., 26 ene. 2020 12:08, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> escribiÃ³: > Pablo > > if you are interested I would like to increase the tests around Form. > The three that exist are in FormTest and to a certain extent to BitBltTest. > If you write tests I will happily review and integrate in the system. > ( I will see if I can hijack some time during a boring meeting to produce > some more). > > I also check the reference to Form and clearly the class Form itself > refers too much to it. > Now with more tests we would be more confident to change. > > > S. > > > On 25 Jan 2020, at 17:41, Pablo Navarro <pablo1n7(a)gmail.com> wrote: > > Hi everyone! Thanks for the comments, I don't create a repository yet > because, in this first version, I just wanted to try if it was possible, so > only create a Form subclass and add three methods. > > Form subclass: #ImageForm > instanceVariableNames: 'mode' > classVariableNames: '' > package: âSmallImage' > > ââ> > > + aImage > "add two image and return a new ImageForm" > |aImageResult| > > aImageResult := self deepCopy. > > 0 to: self width do:[:x| 0 to: self height > do:[:y| > |aPoint aColorA aColorB| > aPoint := (Point x: x y: y). > aColorA := aImageResult colorAt: aPoint. > aColorB := aImage colorAt: aPoint. > aImageResult colorAt: aPoint put: aColorA + aColorB. ]]. > ^ aImageResult > > â-> > > show: anTitle > "Show a image in a window, scale the image to 500" > |im| > im := (ImageMorph withForm: (self scaledIntoFormOfSize:500) ). > im withSnapshotBorder. > im borderWidth: 5. > im color: (Color gray). > im openInWindowLabeled: (anTitle,' | mode: ', self mode asLowercase, '| ', > self shape). > > -â> > > > The first problem I found was the class Form return 'Form new' and not > 'self class new' so I had to create two class method (in ImageForm): > > newFrom: aForm mode: aMode > "create an ImageForm from to a Form object." > | aImage| > > aImage := self new. > aImage copyFrom: aForm. > aImage mode: aMode. > ^ aImage. > > â> > > open: aFileName > âOpen a image.â > | aImage aForm| > aForm := ImageReadWriter formFromFileNamed: aFileName. > aImage := self newFrom: aForm mode: âARGBâ. > ^ aImage. > > â> > > > I think that the methods (+ and show) should be directly in the class Form > but I didn't want to change the original. If you think it's okay, I can > continue working and this week upload to github with their respective tests. > > P.S. sorry for my limited English. > > > > > Best Regards Pablo. > El 25 de ene. de 2020 12:10 -0300, StÃ©phane Ducasse < > stephane.ducasse(a)inria.fr>, escribiÃ³: > > what I always find strange is that people do not invest in tests for > domains that are super nice to testâ¦. > > S. > > On 25 Jan 2020, at 16:04, Serge Stinckwich <serge.stinckwich(a)gmail.com> > wrote: > > You may have a look to Cuis library : > https://github.com/Cuis-Smalltalk/Numerics > There is an image analysis package. > We have some plan in PolyMath to port it: > https://github.com/PolyMathOrg/PolyMath/issues/158 > > Best, > > On Fri, Jan 24, 2020 at 11:20 PM Pablo Navarro <pablo1n7(a)gmail.com> wrote: > >> Hi everyone! >> >> Iâm searching for one library for image processing in Pharo. I couldn't >> find anything (only wrappers) so I tried programming one for basic >> operations (sum, >> subtraction) with images using class âFormâ. >> >> What do you think about this? >> >> >> For providing a context, I'm studying a PhD. in image processing, but all >> of the operations that I do, do it in Python. I try using Pharo for more >> fun :D. >> >> Best Regards Pablo. >> > > > -- > Serge Stinckwic > âhâ > > Int. Research Unit > on Modelling/Simulation of Complex Systems (UMMISCO) > âSorbonne University > (SU) > French National Research Institute for Sustainable Development (IRD)â > U > âniversity of YaoundÃ© Iâ, Cameroon > "Programs must be written for people to read, and only incidentally for > machines to execute." > https://twitter.com/SergeStinckwich > â > > > -------------------------------------------- > StÃ©phane Ducasse > http://stephane.ducasse.free.fr / http://www.pharo.org > 03 59 35 87 52 > Assistant: Julie Jonas > FAX 03 59 57 78 50 > TEL 03 59 35 86 16 > S. Ducasse - Inria > 40, avenue Halley, > Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza > Villeneuve d'Ascq 59650 > France > > > -------------------------------------------- > StÃ©phane Ducasse > http://stephane.ducasse.free.fr / http://www.pharo.org > 03 59 35 87 52 > Assistant: Julie Jonas > FAX 03 59 57 78 50 > TEL 03 59 35 86 16 > S. Ducasse - Inria > 40, avenue Halley, > Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza > Villeneuve d'Ascq 59650 > France > >

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ByteArray for UDP datagram
by HilaireFernandes Jan. 26, 2020

Jan. 26, 2020

Hello, I want to fill a byte array, but this code does not work: | packet | packet := ByteArray streamContents: [:str | str nextPut: 16r02; "TOSERVER_INIT" nextPut: 28; "SER_FMT_VER_HIGHEST_READ" uint16: 0; "NETPROTO_COMPRESSION_NONE" uint16: 37; "CLIENT_PROTOCOL_VERSION_MIN" uint16: 38; "LATEST_PROTOCOL_VERSION" nextPutAll: 'Player'. "Player name" ]. packet contents nor this variant: | packet | packet := OrderedCollection streamContents: [:str | str nextPut: 16r02; "TOSERVER_INIT" nextPut: 28; "SER_FMT_VER_HIGHEST_READ" uint16: 0; "NETPROTO_COMPRESSION_NONE" uint16: 37; "CLIENT_PROTOCOL_VERSION_MIN" uint16: 38; "LATEST_PROTOCOL_VERSION" nextPutAll: 'Player'. "Player name" ]. (ByteArray withAll: packet contents) inspect Given the packet must to be filled with byte, short, double, string, what is the best/neat way to prepare packet for datagram? Thanks Hilaire ----- http://drgeo.eu -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Willow documentation
by TomaÅ¾ Turk Jan. 24, 2020

Jan. 24, 2020

Dear all, I'm trying out Willow which looks very interesting, however I'm struggling with simple examples ... I basically follow the blogs (here <https://medium.com/mercap-tech-blog/willow-introduction-d498e198dd4a>). I loaded Willow with Bootstrap and prepared the To-Do app as described in blog series. This works OK, however when I try to do something more, like button := AsynchronicButtonWebView labeled: 'Now it''s time to click'. button onTrigger executeOnClient: [ :canvas | canvas javascript alert: 'You just clicked a button' ] the browser's javascript gives no response, and its console reports some errors: It looks like problems with libraries. I checked the examples in WillowPlayground (which works OK, BTW), and found out that some basic things are way richer than described in the blogs. For instance, component supplier is not just componentSupplierForApplication ^ Bootstrap4ComponentSupplier online as in the blog, but: componentSupplierForApplication ^ BootstrapComponentSupplier withBootstrapLibrary: (self deploymentMode libraryFor: Bootstrap3MetadataLibrary) withoutOptionalTheme selectLibrary: ((self deploymentMode libraryFor: BootstrapSelectLibrary) using: self language) datepickerLibrary: ((self deploymentMode libraryFor: BootstrapDatepickerLibrary) using: self language) typeaheadLibrary: (self deploymentMode libraryFor: BootstrapTypeaheadLibrary) new My question is - is there a better documentation available for Willow? It's quite hard to study all bits and pieces from scratch. The second question is about the suggested "architecture" or design pattern that should be followed when using Willow. The blog mixes Seaside components (e.g. #PendingTask as a subclass of WAPainter) that engages Seaside rendering elements (e.g. html paragraph:) on one hand, with the components supplier's components (e.g. singleLineTextField ...) implemented directly in the Willow Application on the other hand. This probably isn't the way things should be done :-) Best wishes, Tomaz

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spec 2 documentation
by Steve Quezadas Jan. 24, 2020

Jan. 24, 2020

guys, is there any "official" documentation on spec 2? I found a video on youtube, a slide deck from a presentation, and this github page: https://github.com/dionisiydk/Spec2 It seems to have some sort of integration with gtk, but not too much documentation. - Steve

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Extracting MP3 metadata
by sergio ruiz Jan. 24, 2020

Jan. 24, 2020

One of the projects I am working on requires the reading of mp3 metadata. I see this is covered all over the place in different languages, but I donât see one for Pharo/Smalltalk. Does anyone know off hand of something like this? Would it be worthwhile to do something like this in Smalltalk, or would it be a better idea to find and executable somewhere, run it, and parse the data there? Thanks! ---- peace, sergio photographer, journalist, visionary Public Key: https://pgp.key-server.io/pks/lookup?op=get&search=0x69B08F58923AB3A2 #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV @sergio_101@mastodon.social https://sergio101.com http://www.codeandmusic.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

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[ANN] Pharo Consortium New Academic Member: ÃTS MontrÃ©al
by Marcus Denker Jan. 24, 2020

Jan. 24, 2020

The Pharo Consortium is very happy to announce that ÃTS MontrÃ©al has joined the Consortium as an Academic Member. About - ÃTS MontrÃ©al: https://www.etsmtl.ca/en/Home - Pharo Consortium: http://consortium.pharo.org The goal of the Pharo Consortium is to allow companies and institutions to support the ongoing development and future of Pharo. Individuals can support Pharo via the Pharo Association: http://association.pharo.org

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UK Smalltalk User Group meeting: Beers and Pharo 8 - 29 January 2020
by Giovanni Corriga Jan. 23, 2020

Jan. 23, 2020

The next meeting of the UK Smalltalk User Group will be on Wednesday, January 29th. We'll meet at our usual venue, The City Pride ( https://www.cityprideclerkenwell.co.uk/ ), from 7pm onwards. For this monthâs meeting, weâll explore the new release 8.0 of Pharo, which was announced a few weeks ago. If you'd like to join us, you can show up at the pub. You can also sign up in advance on the meeting's Meetup page https://www.meetup.com/UKSTUG/events/cbklbrybccbdc/ . Donât forget to bring your laptop!

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Re: [Pharo-users] Embedding pharo in C++
by Pierce Ng Jan. 22, 2020

Jan. 22, 2020

On Tue, Jan 21, 2020 at 08:20:48PM +0100, Roland PlÃ¼ss via Pharo-users wrote: > The first mode is the "runtime mode". This would be the mode used for > the released products and does not allow to "directly modify" the image. > This mode would only require basic set of classes (frameworks) since the > game engine provides a large set of functionality in the module layer so > the script layer provides the logic, UI and things like that. This image > would not require to be enriched with a lot of things. This is doable currently. The Pharo image is embedded into the executable and used in read-only mode. Although personally I'd implement as much of the app logic in Pharo as possible simply because of the high productivity. > The second mode is the "development mode". For this one I thought about > exposing a Pharo VM image acting as the Coding and Debugging IDE. Here I > would opt to expose the full power of Pharo/Smalltalk to the developer. I envisage doing this via some kind of data exchange between the host program and Pharo, which seems doable for both the embedded and 'over the wire' development cases. Pablo recently published an example of embedding a headless-but-GUI Pharo image inside a C program via the Windows resource mechanism. As it happens, I have just implemented the same example that works on Linux and MacOS from one source code. Didn't test on Windows, but I'm sure it'll work there too. In a day or two I will publish the code and blog post. Attached teaser screenshot. :-) Pierce

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[ANN] SmalltalkCI now supports Pharo 9
by Gabriel Cotelli Jan. 22, 2020

Jan. 22, 2020

Hi, Just to let you know that smalltalkCI was updated to include Pharo 9, 32 and 64 bits as available versions to be used, and stable/alpha were updated to be Pharo 8 and Pharo 9. Thanks Pablo Tesone & Fabio Niephaus for helping in getting this updates ready. Regards, Gabriel

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voyage mongo and transactionality
by Jonathan van Alteren Jan. 22, 2020

Jan. 22, 2020

Hello all, We are having some issues with using Voyage/Mongo for a customer project that I'd like to get your feedback on. The customer application is a form based business web application using Seaside with object persistence using Voyage with MongoDBÂ on Pharo 7.0. The application is deployed on a dedicated Linux production server running MongoDB version 4.2. The application is used to manage meeting agendas and minutes. After opening the agenda view of a future meeting, the user can add an item to the agenda by clicking a button. This calls an item editor component which answers when a Save or Cancel button is clicked. The agenda view component itself also has a Save button, which performs a Voyage save of the object aggregate (agenda + items). We've encountered an issue where a user makes changes to an agenda, but does not click the Save button. Instead, the user closes the browser or uses the navigation to go to a different part of the application. When navigating back to the original agenda, the changes made previously (e.g. items added) are still being displayed, even though they were never explicitly saved. It does not matter if we select the agenda aggregate object instance using Voyage or access it in a different way. Changes to the state of the object are retained, even though a Voyage save was never sent to the agenda instance. The cause seems to be that the Voyage repository caches the object instance and thus on select, it returns an object that is in a different state than how it was persisted. This all seems to come down to object transactionality. We have a need to 'cancel' changes made to an object instance. Before working with Pharo/Smalltalk in a non-image based environment, I was used to do this by retrieving the original object from persistence again. This also allowed for a convenient way to detect changes to an object's state, which we are missing at the moment too. We know that moving to GemStone can help us with these issues, but our current planning of customer projects does not allow us to do this within the next 3 months. And we really need to find a way to tackle these issues . Your feedback is greatly appreciated! Kind regards, Jonathan van Alteren Founding Member | Object Guild jvalteren(a)objectguild.com

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