November 2013 - Pharo-users

Re: [Pharo-users] [Athens] Finding if a line passes through a specific pixel .

by btc＠openinworld.com

Nov. 23, 2013

Re: [Pharo-users] [Athens] Finding if a line passes through a specific pixel .

by kilon alios

would I sound too lazy to ask in which class ? On Sat, Nov 23, 2013 at 11:35 AM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > there are bezier algo in the system > > Stef > > On Nov 20, 2013, at 9:55 PM, kilon alios <kilon.alios(a)gmail.com> wrote: > > yes I found the formula for straight lines and I was wondering what was > the one for bezier curves, so your reply could not have come a better > moment. Thanks I will study it and implement it. > > > On Wed, Nov 20, 2013 at 9:21 PM, Hilaire Fernandes < > hilaire.fernandes(a)gmail.com> wrote: > >> Hello, >> >> You may want to calculate the distance between the mouse position and >> your path (I guess a bezier curve). Then given this distance and a >> tolerance to zero you decide if the mouse position is more or less on >> your path. Calculating the distance you will also get for free the place >> where to add a point on your path. >> >> http://blog.gludion.com/2009/08/distance-to-quadratic-bezier-curve.html >> >> Hilaire >> >> >> Le 14/11/2013 21:07, kilon alios a Ã©crit : >> > In order to do that I will have to check that the line passes through a >> > specific pixel. Or to be more correct that the place that mouse has >> > clicked is where my path passes through. How I do that ? Can Athens do >> > that ? Can athens tell me which pixels my path passes through ? >> > >> >> >> -- >> Dr. Geo http://drgeo.eu >> >> >> > >

Nov. 23, 2013

Re: [Pharo-users] NativeBoost Questions while wrapping FMOD

by kilon alios

However we should acknowledge here that using a FFI, any FFI , in any programming language has the mandatory requirement of knowing C. I certainly do believe that documenting Nativeboost is extremely important for helping people to port C libraries to pharo and making Pharo far more useful but we should not kid ourselves. Coding with Nativeboost even though its inside Pharo , even though its smalltalk syntax, even though it has the tools to make your life easier, its still C coding or even Assembly coding if you are brave enough to use the inline assembler. I want to help with documentation the problem is that I dont know a lot of stuff about Nativeboost besides the basic pointer things I did with NBOpenGL. On Sat, Nov 23, 2013 at 10:10 AM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > > On Nov 23, 2013, at 9:07 AM, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> > wrote: > > I really think that NativeBoost MUST HAVE a decent documentation. > It is a central part of Pharo and Igor you should do something about it. > If I would know I would have written a chapter on it but I cannot because > I DO NOT KNOW. > > > And igor do not tell me that only C programmer should use NativeBoost. > We should focus on our clients and our clients are smart Pharoers that can > learn fast. > > > Stef > > > > > On 21 November 2013 22:40, Sean P. DeNigris <sean(a)clipperadams.com> wrote: > >> I'm wrapping the FMOD cross-platform audio library. The code is MIT and >> lives >> at http://smalltalkhub.com/#!/~SeanDeNigris/FMOD >> >> ======== >> Problem #1: >> ======== >> >> I'm calling into the FMOD library with: >> primStoreIsPlaying: channelHandle in: isPlayingHandle >> <primitive: #primitiveNativeCall module: #NativeBoostPlugin> >> >> "FMOD_RESULT FMOD_Channel_IsPlaying( >> FMOD_CHANNEL *channel, >> bool *isplaying);" >> >> ^ self nbCall: #(FMOD_RESULT >> FMOD_Channel_IsPlaying(NBExternalAddress >> channel, NBExternalAddress isPlayingHandle)). >> >> I call the above with: >> isPlaying >> | isPlaying | >> isPlaying := NBExternalAddress new. >> self primStoreIsPlaying: channel in: isPlaying. >> ^ isPlaying value > 0. >> >> isPlaying is always 0. The method works directly from C with: >> int isPlaying = 1; >> while (isPlaying) { >> FMOD_Channel_IsPlaying(channel, &isPlaying); >> } >> >> I also tried changing the callout signature to "... bool* >> isPlayingHandle)" >> and passing "isPlaying := true." instead of using the NBExternalAddress >> stuff. >> >> err.. again, you must pass an address where value will be stored, > > ^ self nbCall: #(FMOD_RESULT FMOD_Channel_IsPlaying( >> >> NBExternalAddress channel, NBExternalAddress * isPlayingHandle)). > > otherwise you passing NULL pointer, and i quite surprised it not segfaults > when you call it like that (looks like they have a check in the library ) > > you can also use NBExternalTypeValue for that: > > boolValueClass := NBExternalTypeValue ofType: 'bool'. "sure thing, > creating anonymous class for each call is overkill, this should be done > once, somewhere else" > > boolValue := boolValueClass new. > > self callTheThingWith: boolValue. > > boolValue value ifTrue: [... blah] > > (and this will work, assuming you have bool* in signature for this > argument). > > I have a few more questions, but this is the most pressing as it's holding >> up any further development. >> >> Thanks! >> >> >> >> ----- >> Cheers, >> Sean >> -- >> View this message in context: >> http://forum.world.st/NativeBoost-Questions-while-wrapping-FMOD-tp4724116.h… >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com<http://nabble.com/> >> . >> >> > > > -- > Best regards, > Igor Stasenko. > > > >

Nov. 23, 2013

Re: [Pharo-users] [Athens] Finding if a line passes through a specific pixel .

by StÃ©phane Ducasse

there are bezier algo in the system Stef On Nov 20, 2013, at 9:55 PM, kilon alios <kilon.alios(a)gmail.com> wrote: > yes I found the formula for straight lines and I was wondering what was the one for bezier curves, so your reply could not have come a better moment. Thanks I will study it and implement it. > > > On Wed, Nov 20, 2013 at 9:21 PM, Hilaire Fernandes <hilaire.fernandes(a)gmail.com> wrote: > Hello, > > You may want to calculate the distance between the mouse position and > your path (I guess a bezier curve). Then given this distance and a > tolerance to zero you decide if the mouse position is more or less on > your path. Calculating the distance you will also get for free the place > where to add a point on your path. > > http://blog.gludion.com/2009/08/distance-to-quadratic-bezier-curve.html > > Hilaire > > > Le 14/11/2013 21:07, kilon alios a Ã©crit : > > In order to do that I will have to check that the line passes through a > > specific pixel. Or to be more correct that the place that mouse has > > clicked is where my path passes through. How I do that ? Can Athens do > > that ? Can athens tell me which pixels my path passes through ? > > > > > -- > Dr. Geo http://drgeo.eu > > >

Nov. 23, 2013

Re: [Pharo-users] Cleaning up Voyage Documentation

by StÃ©phane Ducasse

excellent we love co-authors Stef On Nov 20, 2013, at 9:04 PM, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > Hi all, > > I am building a small app that uses Voyage and MongoDB as the database, and so I had many questions regarding how to use it and found the documentation lacking. After conversing with Esteban, I proposed that I improve the 'Pharo for the enterprise' chapter on Voyage, based on his responses to my questions. (See https://ci.inria.fr/pharo-contribution/job/PharoForTheEnterprise/lastSucces… and https://github.com/SquareBracketAssociates/PharoForTheEnterprise-english/tr… for the sources) > > So a heads-up: I would like to take a 'lock' on that text for some days (to avoid conflicts and the associated unpleasantness), as I go improving and expanding it in the next few days. > > Also, if you have questions and/or remarks about Voyage and/or the documentation, shoot! I will do my best to address them. > > Greetings, > > ---> Save our in-boxes! http://emailcharter.org <--- > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD lab - Computer Science Department (DCC) - University of Chile > >

Nov. 23, 2013

Re: [Pharo-users] NativeBoost Questions while wrapping FMOD

by StÃ©phane Ducasse

On Nov 23, 2013, at 9:07 AM, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> wrote: > I really think that NativeBoost MUST HAVE a decent documentation. > It is a central part of Pharo and Igor you should do something about it. > If I would know I would have written a chapter on it but I cannot because I DO NOT KNOW. And igor do not tell me that only C programmer should use NativeBoost. We should focus on our clients and our clients are smart Pharoers that can learn fast. > > Stef > >> >> >> >> On 21 November 2013 22:40, Sean P. DeNigris <sean(a)clipperadams.com> wrote: >> I'm wrapping the FMOD cross-platform audio library. The code is MIT and lives >> at http://smalltalkhub.com/#!/~SeanDeNigris/FMOD >> >> ======== >> Problem #1: >> ======== >> >> I'm calling into the FMOD library with: >> primStoreIsPlaying: channelHandle in: isPlayingHandle >> <primitive: #primitiveNativeCall module: #NativeBoostPlugin> >> >> "FMOD_RESULT FMOD_Channel_IsPlaying( >> FMOD_CHANNEL *channel, >> bool *isplaying);" >> >> ^ self nbCall: #(FMOD_RESULT FMOD_Channel_IsPlaying(NBExternalAddress >> channel, NBExternalAddress isPlayingHandle)). >> >> I call the above with: >> isPlaying >> | isPlaying | >> isPlaying := NBExternalAddress new. >> self primStoreIsPlaying: channel in: isPlaying. >> ^ isPlaying value > 0. >> >> isPlaying is always 0. The method works directly from C with: >> int isPlaying = 1; >> while (isPlaying) { >> FMOD_Channel_IsPlaying(channel, &isPlaying); >> } >> >> I also tried changing the callout signature to "... bool* isPlayingHandle)" >> and passing "isPlaying := true." instead of using the NBExternalAddress >> stuff. >> >> err.. again, you must pass an address where value will be stored, >> >> ^ self nbCall: #(FMOD_RESULT FMOD_Channel_IsPlaying( >> NBExternalAddress channel, NBExternalAddress * isPlayingHandle)). >> otherwise you passing NULL pointer, and i quite surprised it not segfaults when you call it like that (looks like they have a check in the library ) >> >> you can also use NBExternalTypeValue for that: >> >> boolValueClass := NBExternalTypeValue ofType: 'bool'. "sure thing, creating anonymous class for each call is overkill, this should be done once, somewhere else" >> >> boolValue := boolValueClass new. >> >> self callTheThingWith: boolValue. >> >> boolValue value ifTrue: [... blah] >> >> (and this will work, assuming you have bool* in signature for this argument). >> >> I have a few more questions, but this is the most pressing as it's holding >> up any further development. >> >> Thanks! >> >> >> >> ----- >> Cheers, >> Sean >> -- >> View this message in context: http://forum.world.st/NativeBoost-Questions-while-wrapping-FMOD-tp4724116.h… >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> >> >> >> -- >> Best regards, >> Igor Stasenko. >

Nov. 23, 2013

Re: [Pharo-users] NativeBoost Questions while wrapping FMOD

by StÃ©phane Ducasse

I really think that NativeBoost MUST HAVE a decent documentation. It is a central part of Pharo and Igor you should do something about it. If I would know I would have written a chapter on it but I cannot because I DO NOT KNOW. Stef > > > > On 21 November 2013 22:40, Sean P. DeNigris <sean(a)clipperadams.com> wrote: > I'm wrapping the FMOD cross-platform audio library. The code is MIT and lives > at http://smalltalkhub.com/#!/~SeanDeNigris/FMOD > > ======== > Problem #1: > ======== > > I'm calling into the FMOD library with: > primStoreIsPlaying: channelHandle in: isPlayingHandle > <primitive: #primitiveNativeCall module: #NativeBoostPlugin> > > "FMOD_RESULT FMOD_Channel_IsPlaying( > FMOD_CHANNEL *channel, > bool *isplaying);" > > ^ self nbCall: #(FMOD_RESULT FMOD_Channel_IsPlaying(NBExternalAddress > channel, NBExternalAddress isPlayingHandle)). > > I call the above with: > isPlaying > | isPlaying | > isPlaying := NBExternalAddress new. > self primStoreIsPlaying: channel in: isPlaying. > ^ isPlaying value > 0. > > isPlaying is always 0. The method works directly from C with: > int isPlaying = 1; > while (isPlaying) { > FMOD_Channel_IsPlaying(channel, &isPlaying); > } > > I also tried changing the callout signature to "... bool* isPlayingHandle)" > and passing "isPlaying := true." instead of using the NBExternalAddress > stuff. > > err.. again, you must pass an address where value will be stored, > > ^ self nbCall: #(FMOD_RESULT FMOD_Channel_IsPlaying( > NBExternalAddress channel, NBExternalAddress * isPlayingHandle)). > otherwise you passing NULL pointer, and i quite surprised it not segfaults when you call it like that (looks like they have a check in the library ) > > you can also use NBExternalTypeValue for that: > > boolValueClass := NBExternalTypeValue ofType: 'bool'. "sure thing, creating anonymous class for each call is overkill, this should be done once, somewhere else" > > boolValue := boolValueClass new. > > self callTheThingWith: boolValue. > > boolValue value ifTrue: [... blah] > > (and this will work, assuming you have bool* in signature for this argument). > > I have a few more questions, but this is the most pressing as it's holding > up any further development. > > Thanks! > > > > ----- > Cheers, > Sean > -- > View this message in context: http://forum.world.st/NativeBoost-Questions-while-wrapping-FMOD-tp4724116.h… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > > > > -- > Best regards, > Igor Stasenko.

Nov. 23, 2013

Re: [Pharo-users] How images can be loaded

by Hilaire Fernandes

Le 22/11/2013 19:00, Ronie Salgado a Ã©crit : > I would like to know how I could load .png image into pharo, and being > able to Check my post a few days ago about PNG image, it comes with code sample. Hilaire -- Dr. Geo http://drgeo.eu

Nov. 23, 2013

Re: [Pharo-users] How images can be loaded

by StÃ©phane Ducasse

hi ronie to get access to pixel have a look at the Form class (you also have the BitBlt class). Once you have a Morph you can get its form normally sending it form. Stef On Nov 22, 2013, at 7:45 PM, Ronie Salgado <roniesalg(a)gmail.com> wrote: > Thanks, It works very well. > > Greetings, > Ronie Salgado > > > 2013/11/22 Sven Van Caekenberghe <sven(a)stfx.eu> > Hi Ronie, > > On 22 Nov 2013, at 19:00, Ronie Salgado <roniesalg(a)gmail.com> wrote: > > > Hello, > > > > I would like to know how I could load .png image into pharo, and being able to access to their pixel data for manipulation or display it. > > > > Greetings, > > Ronie Salgado > > Here is an example: > > '/Users/Sven/Desktop/test.jpg' asFileReference readStreamDo: [ :in | > (JPEGReadWriter on: in) nextImage asMorph openInWindow ]. > > Inspect the results of #nextImage or #asMorph to learn more, this code actually opens the image in a window in Pharo. > > Regards, > > Sven >

Nov. 22, 2013

Re: [Pharo-users] How images can be loaded

by Ronie Salgado

Thanks, It works very well. Greetings, Ronie Salgado 2013/11/22 Sven Van Caekenberghe <sven(a)stfx.eu> > Hi Ronie, > > On 22 Nov 2013, at 19:00, Ronie Salgado <roniesalg(a)gmail.com> wrote: > > > Hello, > > > > I would like to know how I could load .png image into pharo, and being > able to access to their pixel data for manipulation or display it. > > > > Greetings, > > Ronie Salgado > > Here is an example: > > '/Users/Sven/Desktop/test.jpg' asFileReference readStreamDo: [ :in | > (JPEGReadWriter on: in) nextImage asMorph openInWindow ]. > > Inspect the results of #nextImage or #asMorph to learn more, this code > actually opens the image in a window in Pharo. > > Regards, > > Sven >

Nov. 22, 2013