April 2014 - Pharo-users - lists.pharo.org

Re: [Pharo-users] RDBMS Atomic Counter?

by Stephan Eggermont

You might be much happier with your locks if you grab blocks of numbers at a time. Stephan

April 16, 2014

RDBMS Atomic Counter?

by Esteban A. Maringolo

Hi, A few weeks ago Sven was asking for a lock-free in-image atomic counter. Today I'm in need of implementing a DB backed (PGSQL) counter for business forms numbering, and maybe there are some toughts you're willing to share :) I can't find any other way than a row lock for each counter, but maybe there is something better (I avoid locks as much as possible). Any thoughts to share here? Regards!

April 16, 2014

Re: [Pharo-users] We need *you* for the upcoming Pharo's website

by kilon alios

I was thinking of creating a screencast to explain in a few minutes why I like Pharo, emphasizing on live coding , the image and the development environment. By coincidence I recorded a test tutorial yesterday (before noticing this announcement) for the very basics of pharo, just 15 minutes. So its definitely something I am willing to do. Its just that will like to do several tries and possible edit it to make it as efficient and as simple as possible. So If you are not in a hurry I can offer something. On Wed, Apr 16, 2014 at 12:16 PM, Esteban Lorenzano <estebanlm(a)gmail.com>wrote: > please do not answer all at once! (subtle irony) > anyway, I have to add that screencast has to be Pharo3 based. > > cheers, > Esteban > > On 15 Apr 2014, at 13:03, Damien Cassou <damien.cassou(a)gmail.com> wrote: > > > Hi everyone, > > > > we are working on a new website for Pharo! We need your help. If you > > have some time, please create and send us one of the following items: > > > > - An up-to-date screenshot of Pharo 3.0 that shows some cool features. > > It should be 800px wide ; > > - A screencast ; > > - A paragraph (around 40 words) that presents a nice topic about Pharo > > and a corresponding screenshot. > > > > We will select 1 large screenshot, 3 screencasts and 4 topic paragraphs. > > > > This could be a very nice way for you to contribute to Pharo! > > > > Best, > > > > -- > > Damien Cassou > > http://damiencassou.seasidehosting.st > > > > "Success is the ability to go from one failure to another without > > losing enthusiasm." > > Winston Churchill > > > > >

April 16, 2014

Re: [Pharo-users] We need *you* for the upcoming Pharo's website

by Esteban Lorenzano

please do not answer all at once! (subtle irony) anyway, I have to add that screencast has to be Pharo3 based. cheers, Esteban On 15 Apr 2014, at 13:03, Damien Cassou <damien.cassou(a)gmail.com> wrote: > Hi everyone, > > we are working on a new website for Pharo! We need your help. If you > have some time, please create and send us one of the following items: > > - An up-to-date screenshot of Pharo 3.0 that shows some cool features. > It should be 800px wide ; > - A screencast ; > - A paragraph (around 40 words) that presents a nice topic about Pharo > and a corresponding screenshot. > > We will select 1 large screenshot, 3 screencasts and 4 topic paragraphs. > > This could be a very nice way for you to contribute to Pharo! > > Best, > > -- > Damien Cassou > http://damiencassou.seasidehosting.st > > "Success is the ability to go from one failure to another without > losing enthusiasm." > Winston Churchill >

April 16, 2014

We need *you* for the upcoming Pharo's website

by Damien Cassou

Hi everyone, we are working on a new website for Pharo! We need your help. If you have some time, please create and send us one of the following items: - An up-to-date screenshot of Pharo 3.0 that shows some cool features. It should be 800px wide ; - A screencast ; - A paragraph (around 40 words) that presents a nice topic about Pharo and a corresponding screenshot. We will select 1 large screenshot, 3 screencasts and 4 topic paragraphs. This could be a very nice way for you to contribute to Pharo! Best, -- Damien Cassou http://damiencassou.seasidehosting.st "Success is the ability to go from one failure to another without losing enthusiasm." Winston Churchill

April 15, 2014

Re: [Pharo-users] Athens and ellipse drawing

by Juraj Kubelka

El 14-04-2014, a las 8:21, Juraj Kubelka <juraj.kubelka(a)gmail.com> escribiÃ³: > Thank you Stef, > > the example helped me a lot to understand how to play with Athens. > > The solution is not what I am looking for. If someone starts to play with alpha canal, s/he will get unexpected results. > > I have finally found an example in C language. It look like this: > -=-=-=-=- > cairo_set_line_width (cr, 0.1); > cairo_save (cr); > cairo_scale (cr, 1, 0.2); > cairo_arc (cr, 1.5, 1.5, 1, 0, 2 * M_PI); > cairo_restore (cr); > cairo_set_source_rgba (cr, 0, 1, 0, 0.50); > cairo_stroke (cr); > -=-=-=-=- > <tips-ellipse.png> > > I do not know how to write the same instructions with Athens. > > First, they draw one arc (cairo_arc (cr, 1.5, 1.5, 1, 0, 2 * M_PI);), I draw 4 arcs: > -=-=-=-=- > canvas > createPath: [ :builder | > builder > absolute; > moveTo: 0 @ 0.5; > ccwArcTo: 0.5 @ 0.0 angle: 90 degreesToRadians; > ccwArcTo: 0.0 @ -0.5 angle: 90 degreesToRadians; > ccwArcTo: -0.5 @ 0.0 angle: 90 degreesToRadians; > ccwArcTo: 0 @ 0.5 angle: 90 degreesToRadians ]. > -=-=-=-=- OK, now I can draw ellipse with just one arc: -=-=-=- canvas createPath: [ :builder | builder absolute; moveTo: 0.5 @ 0; arcCenterX: 0 centerY: 0 radius: 0.5 startAngle: 0 endAngle: Float twoPi -=-=-=- Why is this method in private protocol? Why I should not use it? Why I have to use âmoveTo:â? In C-example they do not use it. But I have to, otherwise there is an extra line on the canvas: Well, I see in AthensCairoPathBuilder>>createPath:, there is call of "self moveToX: 0 Y: 0.â. If I remove it, I do not have to write âmoveTo: 0.5@0â. So, I understand why I have to write it in my code. The question is what is the purpose of "self moveToX: 0 Y: 0.â? I guess it simplify some situations, am I right? Which one? There is actual Athens example: -=-=-=- AthensSceneView new scene: [ :can | | path | path := can createPath: [ :builder | builder absolute; moveTo: 0.5 @ 0; arcCenterX: 0 centerY: 0 radius: 0.5 startAngle: 0 endAngle: Float twoPi ]. can pathTransform restoreAfter: [ can pathTransform scaleBy: 200 @ 50. (can setStrokePaint: Color red) width: 0.1. can drawShape: path. ]. ] ; openInWindow -=-=-=- Thank you, Juraj > > Second, they set line width, before any other action (like cairo_save). I do: > -=-=-=-=- > canvas pathTransform scaleBy: 200 @ 50. > (can setStrokePaint: Color red) width: 0.1. > can drawShape: path. > -=-=-=-=- > > So, my result in Athens is like this: > <Captura de pantalla 2014-04-14 a la(s) 8.18.38.png> > > Any idea? The example is explained here, C source code is here (by clicking on the image in the page). > > Thank you, > Jura > > El 12-04-2014, a las 4:01, Pharo4Stef <pharo4Stef(a)free.fr> escribiÃ³: > >> AthensSceneView new >> scene: [ :can | >> | path | >> path := can >> createPath: [ :builder | >> builder >> absolute; >> moveTo: 0 @ 0.5; >> ccwArcTo: 0.5 @ 0.0 angle: 90 degreesToRadians; >> ccwArcTo: 0.0 @ -0.5 angle: 90 degreesToRadians; >> ccwArcTo: -0.5 @ 0.0 angle: 90 degreesToRadians; >> ccwArcTo: 0 @ 0.5 angle: 90 degreesToRadians ]. >> >> can pathTransform >> restoreAfter: [ >> can pathTransform scaleBy: 200 . >> can >> setPaint: Color red ; >> drawShape: path. >> "(athensCanvas setStrokePaint: strokePaint) >> width: (self strokeWidth / self scale) asFloat." >> can drawShape: path.]. >> can pathTransform >> restoreAfter: [ >> can pathTransform scaleBy: 190 . >> can >> setPaint: Color blue ; >> drawShape: path. >> "(athensCanvas setStrokePaint: strokePaint) >> width: (self strokeWidth / self scale) asFloat." >> can drawShape: path >> >> ] >> ] ; >> openInWindow >> >> >> <Screen Shot 2014-04-12 at 09.01.09.pdf> >

April 14, 2014

Re: [Pharo-users] Athens and ellipse drawing

by Juraj Kubelka

Thank you Stef, the example helped me a lot to understand how to play with Athens. The solution is not what I am looking for. If someone starts to play with alpha canal, s/he will get unexpected results. I have finally found an example in C language. It look like this: -=-=-=-=- cairo_set_line_width (cr, 0.1); cairo_save (cr); cairo_scale (cr, 1, 0.2); cairo_arc (cr, 1.5, 1.5, 1, 0, 2 * M_PI); cairo_restore (cr); cairo_set_source_rgba (cr, 0, 1, 0, 0.50); cairo_stroke (cr); -=-=-=-=- I do not know how to write the same instructions with Athens. First, they draw one arc (cairo_arc (cr, 1.5, 1.5, 1, 0, 2 * M_PI);), I draw 4 arcs: -=-=-=-=- canvas createPath: [ :builder | builder absolute; moveTo: 0 @ 0.5; ccwArcTo: 0.5 @ 0.0 angle: 90 degreesToRadians; ccwArcTo: 0.0 @ -0.5 angle: 90 degreesToRadians; ccwArcTo: -0.5 @ 0.0 angle: 90 degreesToRadians; ccwArcTo: 0 @ 0.5 angle: 90 degreesToRadians ]. -=-=-=-=- Second, they set line width, before any other action (like cairo_save). I do: -=-=-=-=- canvas pathTransform scaleBy: 200 @ 50. (can setStrokePaint: Color red) width: 0.1. can drawShape: path. -=-=-=-=- So, my result in Athens is like this: Any idea? The example is explained here, C source code is here (by clicking on the image in the page). Thank you, Jura El 12-04-2014, a las 4:01, Pharo4Stef <pharo4Stef(a)free.fr> escribiÃ³: > AthensSceneView new > scene: [ :can | > | path | > path := can > createPath: [ :builder | > builder > absolute; > moveTo: 0 @ 0.5; > ccwArcTo: 0.5 @ 0.0 angle: 90 degreesToRadians; > ccwArcTo: 0.0 @ -0.5 angle: 90 degreesToRadians; > ccwArcTo: -0.5 @ 0.0 angle: 90 degreesToRadians; > ccwArcTo: 0 @ 0.5 angle: 90 degreesToRadians ]. > > can pathTransform > restoreAfter: [ > can pathTransform scaleBy: 200 . > can > setPaint: Color red ; > drawShape: path. > "(athensCanvas setStrokePaint: strokePaint) > width: (self strokeWidth / self scale) asFloat." > can drawShape: path.]. > can pathTransform > restoreAfter: [ > can pathTransform scaleBy: 190 . > can > setPaint: Color blue ; > drawShape: path. > "(athensCanvas setStrokePaint: strokePaint) > width: (self strokeWidth / self scale) asFloat." > can drawShape: path > > ] > ] ; > openInWindow > > > <Screen Shot 2014-04-12 at 09.01.09.pdf>

April 14, 2014

Re: [Pharo-users] [ANN] WIP iStoa

by Bernat Romagosa

Hi Hilaire! I'm on holidays now until next Tuesday, but I'll package a compiled VM for you when I get back :) Best, Bernat. 2014-04-09 17:45 GMT+02:00 Hilaire Fernandes <hilaire.fernandes(a)gmail.com>: > LOL. > So you have no choice but to prepare for me an archive with your > compiled VM, so I will use it ;-) (my system use glibc 2.15 anyway) > > Hilaire > > Le 09/04/2014 14:29, Bernat Romagosa a Ã©crit : > > Ouch! I think it was myself who compiled it... I'll check again tomorrow! > > > > -- > Dr. Geo http://drgeo.eu > > > -- Bernat Romagosa.

April 14, 2014

Spec: replace sub-widget

by Sean P. DeNigris

I have a ComposeableModel, which contains another ComposeableModel: self instantiateModels: #( flashCardModel FeFlashCardUI). I want to refresh child and update the parent. Before doing "self buildWithSpec", - Replacing the child's model works: "flashCardModel model: self newFlashCard." - But replacing the whole child doesn't work: "flashCardModel := self newFlashCardUI." Why? What's the right way to handle this? Thanks. ----- Cheers, Sean -- View this message in context: http://forum.world.st/Spec-replace-sub-widget-tp4754364.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 12, 2014

Re: [Pharo-users] can we have the pharo theme back please?

by Ben Coman

April 12, 2014