November 2013 - Pharo-dev - lists.pharo.org

Re: [Pharo-dev] Efficient string concatenation - proposed new

by Tudor Girba

Hi, Hmm, I knew it would be slower, but I did not expect this slowdown. Thank you both for the explanations. Something to learn every single day :). Cheers, Doru On Sun, Nov 17, 2013 at 9:54 PM, Andres Valloud < avalloud(a)smalltalk.comcastbiz.net> wrote: > Weâre only measuring execution speed, not memory allocation, which is >> important too. >> > > Yes. And besides having to collect the garbage at some point, allocation > can be costly because the VM has to zero out the string bytes (or nil them > if the string is not encoded) and then write on those zeroed (nilled) > places with something else. It takes time. > > > The length of the strings is a variable as well, of course. >> > > The order also matters, e.g. > > (String new: 7812681237643287423), 'a', 'b', 'c' > > and the way you aggregate the result matters as well. > > > Conclusion, letâs be careful with a too simple advice. >> > > Yes, it's much more complex than it seems when the inefficiency of naive > concatenation methods is not flagrant. > > Andres. > > -- www.tudorgirba.com "Every thing has its own flow"

Nov. 18, 2013

Re: [Pharo-dev] How to draw an ellipse with Athens?

by milton mamani

Hi Alex! I made a simple code in sunburst: .=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.= | node view| view := ROView new. node := ROElement on:'Hello world'. node + ROLabel. node addShape: ((ROArc startAngle: 0 endAngle: 360) fillColor: Color lightGray); @RODraggable. view add: node. node translateBy: 100 @ 100. view open. .=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.= [image: ImÃ¡genes integradas 2] Cheers, Milton 2013/11/17 Alexandre Bergel <alexandre.bergel(a)me.com> > Hi! > > In Roassal, I have the following to draw an ellipse: > > -=-=-=-=-=-=-=-=-=-= > fillOval: aRectangle color: aColor borderWidth: aBorderWidth borderColor: > aBorderColor > > |p rect stroke | > > rect := self virtualToRealRectangle: aRectangle. > > nativeCanvas pathTransform restoreAfter: [ > p:= nativeCanvas createPath: [:path | > |halfPi | > halfPi := Float pi /2. > path > absolute; > moveTo: rect topCenter; > cwArcTo: rect rightCenter angle: halfPi; > cwArcTo: rect bottomCenter angle: halfPi; > cwArcTo: rect leftCenter angle: halfPi; > cwArcTo: rect topCenter angle: halfPi]. > nativeCanvas setShape: p. > nativeCanvas setPaint: aColor. > nativeCanvas draw. > stroke := nativeCanvas setStrokePaint: aBorderColor. > stroke width: aBorderWidth. > nativeCanvas draw > ] > -=-=-=-=-=-=-=-=-=-= > I feel this is not quite right. > > It produces something like: > > With the following Roassal script: > > -=-=-=-=-=-=-=-=-=-= > | view el | > view := ROView new. > el := ROElement on: 'hello world'. > el + ROLabel + ROEllipse. > el @ RODraggable. > view add: el. > view open > -=-=-=-=-=-=-=-=-=-= > > > It is has if the halfPi variable does not have the right value. > I have found example on the web (e.g., > https://developer.gnome.org/gtkmm-tutorial/3.2/sec-cairo-drawing-arcs.html.… > ) > However I was not able to map them in Athens. > > Help appreciated. This is a bug in Roassal that has been there for too > long :-) > > Cheers, > Alexandre > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >

Nov. 17, 2013

FileSystem-Zip

by Nicolas Cellier

FileSystem-Zip seems to be unused in Pharo3.0. What are the plans? Are there pitfall/known problems?

Nov. 17, 2013

Re: [Pharo-dev] Efficient string concatenation - proposed new

by Andres Valloud

> Weâre only measuring execution speed, not memory allocation, which is important too. Yes. And besides having to collect the garbage at some point, allocation can be costly because the VM has to zero out the string bytes (or nil them if the string is not encoded) and then write on those zeroed (nilled) places with something else. It takes time. > The length of the strings is a variable as well, of course. The order also matters, e.g. (String new: 7812681237643287423), 'a', 'b', 'c' and the way you aggregate the result matters as well. > Conclusion, letâs be careful with a too simple advice. Yes, it's much more complex than it seems when the inefficiency of naive concatenation methods is not flagrant. Andres.

Nov. 17, 2013

Re: [Pharo-dev] Efficient string concatenation - proposed new

by Andres Valloud

The details really don't fit in an email, however the 2nd volume of my Fundamentals book already has an analysis of this issue and hence my previous comment. On 11/17/13 8:45 , StÃ©phane Ducasse wrote: > this one is surprising to me > >> [ 'foo', 'bar', 'baz', 'foobar' ] bench. '2,030,000 per second.' >> [ '' join: #( 'foo' 'bar' 'baz' 'foobar' ) ] bench. '665,000 per second.' >> [ String streamContents: [ :out | out nextPutAll: 'foo'; nextPutAll: >> 'bar'; nextPutAll: 'baz'; nextPutAll: 'foobar' ] ] bench. '1,580,000 >> per second.' > > .

Nov. 17, 2013

Help in St. Petersburg?

by HernÃ¡n Morales Durand

I am sorry for the off-topic. A friend of mine was stolen in Sofia and now she is completely out of money going to St. Petersburg in a few days. Anyone there who can help her a little bit would be really appreciated. Cheers, HernÃ¡n

Nov. 17, 2013

Annoying bug with TWM & Progress bars

by phil＠highoctane.be

When one uses TWM (Tiling Window Manager), the progress bars are hidden behind it. How could one make those bars go a bit to the right so that we don't have this unfortunate effect? Phil

Nov. 17, 2013

Nautilus issue with right click menus

by phil＠highoctane.be

https://pharo.fogbugz.com/default.asp?12190 This bug is annoying since it requires to have a package selected. For newcomers, this is difficult to grasp. Maybe should we have a default package, like "Sandbox" or something present in the image and Nautilus starting in there. Phil

Nov. 17, 2013

Re: [Pharo-dev] Spotlight discussion

by Benjamin

Ben On 17 Nov 2013, at 20:02, phil(a)highoctane.be wrote: > Never mind about the popup as I can configure that on my own. > > Now, it is modeled after OSX spotlight which happens to be in the top right of the screen, but no other reason. > > Windows 8 gives us a search panel showing on the side. > > In Eclipse, it shows as a popup http://www.eclipseonetips.com/2011/02/21/the-easiest-ways-to-navigate-metho… > > But really the width of the list is the key pain with the current spotlight for me. That I can do something about it I think :P Ben > > Phil > > > On Sun, Nov 17, 2013 at 7:08 PM, Benjamin <Benjamin.VanRyseghem.Pharo(a)gmail.com> wrote: > we can give a try, but I try to reduce the number of popups as much as I can > since it only confuses the user for often very few benefits > > Ben > > On 17 Nov 2013, at 18:14, phil(a)highoctane.be wrote: > >> Some things about old/new spotlight >> >> - the width of the completions rectangle should be configurable as I often find myself looking at messages that are too long and get cut at the end, while what matters is what is at the end. I looked at the code and found that changing the size of the spotlight morph to be easy, but not so for the completion list which seems to be buried down somewhere in ECCompletion. >> >> - there is no way to find numerical functions like sin exp... which is a pain. I guess that's due to the 3 letters required before a search. >> >> Now, about the location, why do we need that on the top right? >> I'd love to have the morph open in the middle of the screen, where I am looking anyway, and not on the top right. >> A bit like how Launchy works. http://www.launchy.net/ >> >> >> Phil >> >> >> On Sun, Nov 17, 2013 at 1:35 PM, Camillo Bruni <camillobruni(a)gmail.com> wrote: >> >> On 2013-11-17, at 13:24, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: >> >> > You need first this magic invocation >> > >> > GlobalMenuBar current >> > openInWorld; >> > beSticky. >> > >> > Then it will be in the top right corner. >> > Note: there is s far no hotkey to get the focus. >> > Note2: it is probably buggy since it has not been updated to the new Spec3 >> I can confirm the last part, though looks like the way to go! >> > >

Nov. 17, 2013

Re: [Pharo-dev] New builder for Roassal: building geographical maps

by phil＠highoctane.be

There is open data published as Shape files. http://opendata.awt.be/organization/dgo1-routes-et-batiments On Sun, Nov 17, 2013 at 7:47 PM, Alexandre Bergel <alexandre.bergel(a)me.com>wrote: > We indeed may have a need in the future about shp files. > We will see. > > Alexandre > > > On Nov 17, 2013, at 2:40 AM, HernÃ¡n Morales Durand < > hernan.morales(a)gmail.com> wrote: > > > Yes, loading .shp is mandatory for GIS features. I don't know how it > matches with your GPS project or it's complementary with your > Athens/Roassal implementation. I hope so because it would be a real open > door for GIS developers. > > > > I have updated the packages and added an install script. Try it tomorrow > in Pharo 2.0 (for some reason I cannot upload changes in StHub now): > > > > http://www.smalltalkhub.com/#!/~hernan/Shapes > > > > With this dataset: > > > > > https://drive.google.com/file/d/0B7XMfmjGRcXAdkgzeE84c2JtZEk/edit?usp=shari… > > > > | shpE legend | > > shpE := ShapeEnsemble fromFile: 'ne_110m_admin_0_countries.shp'. > > shpE attribute: 'CONTINENT'. > > legend := ColorLegend mapValuesToRandom: shpE valuesOfCurrentAttribute. > > shpE legend: legend. > > shpE displayMorphic > > > > I have reviewed the code and there is a great effort put into. However > there are places which need savage refactoring. > > > > HernÃ¡n > > > > > > > > El 16/11/2013 22:31, btc(a)openinworld.com escribiÃ³: > >> Alexandre Bergel wrote: > >>>> Have you checked Shapes to load ESRI .shp files? > >>>> > >>>> http://www.smalltalkhub.com/#!/~hernan/Shapes > >>>> > >>> > >>> Apparently it does not load in Pharo 3.0. I am not sure how popular > are .shp files. The map I used in my examples are SVG path description. > >>> > >> > >> SHaPe files a very popular with mining & oil companies => potential > >> clients with big wallets. ESRI are the defacto standard for GIS. There > >> are also probably a lot of smaller organisations limping by with data > >> locked in old ESRI versions because upgrading is too expensive. Might > >> be a good collaboration with your local GIS group. > >> > >> cheers -ben > >> > >>> Our next goal is to represent GPS coordinate and cities. We will then > probably try to show some visually interesting data (e.g., flights, tweets). > >>> Having this run at the top of Roassal @ Amber will come for free. Stay > tuned! > >>> > >>> Also, in december, when I will visit inria @ Lille, I would like to > push Athens more into Roassal. > >>> > >>> > >>>> There are free shapefile maps in sites like this > >>>> > >>>> http://www.statsilk.com/maps/download-free-shapefile-maps > >>>> > >>> > >>> Impressive website. > >>> > >>> Cheers, > >>> Alexandre > >>> > >>> > >>>> El 16/11/2013 7:52, Alexandre Bergel escribiÃ³: > >>>> > >>>>> It is currently ad-hoc since we use a bitmap for the map, and locate > cities with distances in pixels. > >>>>> > >>>>> We have found description in SVG and found a couple of formulas to > map longitude and latitude into pixels. So we will have something vectorial > very soon. > >>>>> > >>>>> If someone has some ideas, data, examples the we will be very happy > to take them as challenges! > >>>>> > >>>>> Alexandre > >>>>> > >>>>> > >>>>> > >>>>>> Le 15-11-2013 Ã 18:39, Sven Van Caekenberghe<sven(a)stfx.eu> a > Ã©crit : > >>>>>> > >>>>>> Very nice, Alex, I guess you are using shape files then ? > >>>>>> > >>>>>> Sven > >>>>>> > >>>>>> > >>>>>>> On 15 Nov 2013, at 20:56, Alexandre Bergel<alexandre.bergel(a)me.com> > wrote: > >>>>>>> > >>>>>>> Hi! > >>>>>>> > >>>>>>> During our pair coding session on Friday, we worked on a new > builder for Roassal. > >>>>>>> > >>>>>>> Here is short example: > >>>>>>> > >>>>>>> > >>>>>>> | builder | > >>>>>>> builder := ROFranceMapBuilder new. > >>>>>>> builder shape circle size: 15; color: Color red; withLabel. > >>>>>>> builder showCities: #('Paris' 'Lyon' 'Marseille'). > >>>>>>> > >>>>>>> builder shape circle size: 25; color: Color blue; withLabel. > >>>>>>> builder show: 'Nice'. > >>>>>>> > >>>>>>> builder open > >>>>>>> > >>>>>>> It should produce: > >>>>>>> <Screen Shot 2013-11-15 at 4.53.30 PM.png> > >>>>>>> > >>>>>>> > >>>>>>> There is no reference to external files. It runs out of the box. > >>>>>>> > >>>>>>> In case you got a sudden need to press a like button or do some > retweet, here a bit of material: > >>>>>>> > >>>>>>> > https://www.facebook.com/media/set/?set=a.543459092407359.1073741830.340543… > >>>>>>> https://twitter.com/objectprofile/status/401433558684008448 > >>>>>>> > >>>>>>> On our facebook account we have many more screenshots. > >>>>>>> > >>>>>>> Cheers, > >>>>>>> Alexandre > >>>>>>> -- > >>>>>>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > >>>>>>> Alexandre Bergelhttp://www.bergel.eu > >>>>>>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > >>>>>>> > >>>>>> > >>>>> . > >>>>> > >>>>> > >>>> > >>> > >>> > >> > > > > > > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > >

Nov. 17, 2013