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01:01 mithos28: is there a generics library for structs given that you have the corresponding inspector?
01:01 mithos28: I want to be able to do a map-struct that would apply a function to each field within the struct and return a new struct
01:02 mithos28: I can write it myself, but was wondering if something already existed
01:07 dented42: wouldn't that be a form of applicative functors?
01:08 mithos28: That operation might, but I also want to do folds and destroy the structure of the struct
01:09 dented42: ah
01:11 dented42: I remember seeing a paper somewhere on generic catamorphisms
01:11 dented42: although it was in haskell
01:11 haffe: Hey.
01:12 mithos28: Yeah I'm reimplementing a paper that used RepLib in their haskell implementation
01:12 mithos28: haffe: hello
01:13 haffe: I am writting a small object oriented game in racket. I wondered about a design pattern. I have the game board managing it's own draw-queue. Should the instances in the draw queue be supplied the drawing context when they are created?
01:13 mithos28: what is the other option?
01:14 mithos28: also are you doing this imperatively, or through the world API?
01:14 mithos28: or universe as it is now known?
01:14 haffe: I am using the racket graphics library.
01:14 mithos28: which one?
01:14 haffe: racket/draw
01:14 mithos28: ok
01:15 haffe: My idea was to place the things to be drawn on the draw-queue and then do a for x in draw-queue (send x draw)
01:15 mithos28: seems fine
01:16 mithos28: Here is what I would think about, will your game support multiple windows, maybe showing different things
01:17 mithos28: since the drawing context is window specific, does it make more sense for the queue to hold it or the items them selves
01:17 mithos28: will an item ever be drawn into different contexts
01:18 mithos28: will a queue ever have items with different contexts?
01:19 haffe: No.
01:19 haffe: It will just be one canvas for the entire game.
01:19 dented42: do we have a racket translation of the common lisp loop macro?
01:20 haffe: But I guess I could modularize this further.
01:20 haffe: The instances has a public interface that gives cords and graphical representation.
01:20 haffe: Then the draw-queue processor can just ask for cords and representation and use it's own drawing context.
01:21 mithos28: haffe: Both I think work, the queue having the context might make it easier because otherwise you need to have the context when ever you make objects
01:22 haffe: mithos28: Yes.
01:22 haffe: I guess that simplifies.
01:22 haffe: Since the board object allready knows it's dc.
01:22 haffe: Thanks.
01:23 mithos28: dented42: There is the for macros, but they are different
01:23 mithos28: haffe: no problem
01:23 mithos28: dented42: I don't think anyone has ported the full CL loop macro
01:24 mithos28: there is also do
01:24 haffe: Nice.
01:24 dented42: ah, I'm looking for examples of embedded domain specific languages.
01:24 haffe: I am supposed to supervise game projects in racket.
01:25 haffe: I started using the draw library last week.
01:25 mithos28: dented42: look at syntax/parse and match
01:26 mithos28: both very powerful dsls
01:27 dented42: nice, thanks
01:27 mithos28: I'm not sure if they would count as embedded dsls as other languages use the term though
01:27 mithos28: oh the ffi
01:27 dented42: it
01:27 dented42: it's similar enough
01:27 mithos28: that is also a good example
01:27 mithos28: particularly _fun
01:28 dented42: they define their own unique grammer, which is what I'm interested in
01:28 mithos28: redex is another good one
01:29 dented42: I've always wanted an excuse to play with redex, it seems interesting but I'm unsure what it's supposed to be used for.
01:29 mithos28: playing with languages
01:30 dented42: that's /exactly/ what I'm interested in.
01:31 mithos28: http://www.cs.utah.edu/plt/publications/icfp07-fyff.pdf is a good example of what you can do in redex
01:32 mithos28: The best example: http://www.eecs.northwestern.edu/~robby/lightweight-metatheory/
01:32 mithos28: and it comes with the redex models
01:33 (quit) em: Read error: Operation timed out
01:33 dented42: thanks
01:34 mithos28: there is also http://www.amazon.com/Semantics-Engineering-Redex-Matthias-Felleisen/dp/0262062755
01:34 rudybot: http://tinyurl.com/7mu5k3j
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01:43 dented42: ok, so it's like an automated theorem prover that isn't erm… automated.
01:44 mithos28: No, it lets you define a language and small step operational semantics for the language and then experiment with that
01:44 mithos28: Which is similar to what you would do with an automated theorem prover sometimes
01:45 dented42: oh
01:46 mithos28: If you look at the examples with the traces function, you can see how it will run your language
01:46 mithos28: and might show how you have defined it so that your program can have two results
01:47 mithos28: because you defined your language in such a way
01:47 dented42: ah
01:47 mithos28: in the book they have an example with scheme and how it lets arguments be evaluated in any order, and how this can lead to different values
01:48 dented42: right, it lets you play around with a language to determine what consequences follow from the definition
01:48 mithos28: yep
01:49 dented42: cool
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03:30 haffe: Hey sorry to bother you people again.
03:30 mithos28: haffe: it is not a problem, thats why we hang out here
03:30 haffe: But in the racket object system is there a way to define private data members for a class?
03:30 mithos28: just use define
03:30 haffe: define/private seems to fail.
03:31 mithos28: if you don't use define/public it will be private
03:31 haffe: Ok.
03:31 haffe: Thanks.
03:39 lewis17111: doesn't racket differentiate between fields and methods though?
03:39 lewis17111: tbh the guide section on objects is a bit confusing
03:39 lewis17111 looks at it again
03:40 mithos28: anything that is not defined as a method is a field
03:40 mithos28: there is a difference between public fields and private fields
03:44 lewis17111 really doesn't like the oop syntax. but please don't get angry at me because I do like racket
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05:15 lewis17111: how is an identifier related to a symbol, if at all?
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05:28 Gertm: Is it possible to build racket for a no-X environment? (no drracket etc)
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05:38 mrcarrot: Gertm: http://download.racket-lang.org/all-versions.html
05:38 mrcarrot: Gertm: Racket Textual is what you want
05:40 Gertm: Oh, I'm building from the source repo.
05:40 Gertm: Is it possible through a ./configure flag?
05:45 Gertm: Ok, installed it through the racket-textual way, that works too.
05:45 Gertm: Thanks.
05:48 mrcarrot: np
05:55 haffe: Ok, it's me again. I have read the documentation on racket/draw. Is there a way to draw an image directly to a canvas given that canvases drawing context?
05:55 haffe: I want to do something like (send dc draw-bitmap cords size)
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05:59 haffe: Ok.
05:59 haffe: That's how you do it.
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08:35 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/di77Hw
08:35 RacketCommitBot: [racket/master] adjust the easter egg test suite so it can be loaded by Sam's lib - Robby Findler
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09:10 RacketCommitBot: [racket/master] fix a problem with submodule expansion - Matthew Flatt
09:10 RacketCommitBot: [racket/master] documentation clarification - Matthew Flatt
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10:07 samth: everyone who asked a question that was unanswered is now gone :(
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10:49 stamourv: samth: I guess you'll have to do work, then.
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10:51 samth: stamourv: tragic
10:51 stamourv: I know.
10:55 Gertm: Racket threads don't map to OS threads, do they?
10:56 chandler: No, they don't. Racket places map to OS threads.
10:56 samth: Gertm: no, but see places and futures
10:56 chandler: (And futures.)
10:56 Gertm: Ah good. I don't want OS threads for this.
10:57 Gertm: So they're coop threads or something?
10:59 samth: Gertm: they're preemptive from the racket program perspective
10:59 chandler: They're preemptive, but you can yield if you want to.
10:59 samth: (they're implemented cooperatively at the C level)
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11:03 haffe: Hello. One more question. I have a frame, that I want to equip with a keyboard handler. Is there another way than to subclass the canvas from a canvas where the keyhandler is overrided?
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11:03 RacketCommitBot: [racket/master] avoid bad interior pointer - Matthew Flatt
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11:04 samth: haffe: probably not, most of the gui classes expect you to subclass them for custom behavior
11:04 samth: there may already be a mixin for doing what you want, though
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11:19 haffe: Ok, I have done like this http://pastebin.com/1uuJnrce
11:20 haffe: This breaks horribly.
11:21 haffe: Or does it.
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11:46 haffe: Ok, I solved it.
11:46 haffe: Thanke guys.
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13:16 RacketCommitBot: [racket/master] deleted test-docs-complete.rkt - John Clements
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16:09 RacketCommitBot: [racket/master] Fix optimization of first, rest, etc. - Vincent St-Amour
16:09 RacketCommitBot: [racket/master] Fix type of expt. - Vincent St-Amour
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16:57 RacketCommitBot: [racket/master] fix a syntax-object problem related to module bindings - Matthew Flatt
16:57 RacketCommitBot: [racket/master] fix flush for `make-pipe-with-specials' - Danny Yoo
16:57 RacketCommitBot: [racket/master] ffi: extend _list and _vector to support zero-length output - Siddharth Agarwal
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17:44 RacketCommitBot: [racket/master] Autobib errors with no authors or dates on a bib entry. Test included. - Jay McCarthy
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18:06 RacketCommitBot: [racket/master] Fixing PR12658 - Jay McCarthy
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20:31 RacketCommitBot: [racket/master] adjust the contract on string->url so that it actually catches all of - Robby Findler
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21:24 ozzloy: i want to draw with racket code
21:25 ozzloy: i figured the opengl libs would do it.  idk opengl.  how do i go from 0 to a triangle using racket's opengl libs?
21:25 ozzloy: i don't see any copy-pasta code here: http://docs.racket-lang.org/sgl/index.html
21:26 asumu: ozzloy: you specifically want to do 3D or...?
21:26 asumu: It's much easier to draw with racket/draw.
21:27 asumu: Also: "Some examples are available in the "examples" directory of the "sgl" collection in the Racket installation."
21:27 asumu: (maybe some of those can just be put into the docs.. hmmm)
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21:38 asumu: Ah, the examples are too complicated to inline in the docs...
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21:50 ozzloy: asumu, i want 3d yes
21:51 ozzloy: asumu, i'm drawing the scene the camera on a robot i'm working on should see
21:51 asumu: Okay, well the problem is the OpenGL docs aren't meant to teach you OpenGL.
21:51 asumu: You probably want to find a resource on OpenGL itself.
21:51 ozzloy: asumu, i just saw that example thing and tried to run it
21:51 ozzloy: but it didn't work
21:52 ozzloy: so i'm looking into getting the ppa install
21:52 ozzloy: actually i'm compiling stable right now
21:52 ozzloy: but if that doesn't work i'll look into the ppa (ubuntu installing thing)
21:52 asumu: Hmm, the gears.rkt example works for me.
21:53 ozzloy: i may have just botched the compiliing and installing process
21:53 ozzloy: i've been using straight up #lang racket just fine
21:53 ozzloy: and drracket starts
21:53 ozzloy: but i've never done anything with opengl
21:55 ozzloy: that's not entirely true.  i've probably made a triangle before during college
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22:38 ozzloy: asumu, i just tried ../configure&&make&&make install with the latest stable branch.  that gave me a black window with nothing in it, even when i hit t a lot
22:38 ozzloy: then i installed via the ppa
22:39 ozzloy: same thing
22:39 ozzloy: how can i tell if /usr/bin/racket is the one installed by the ppa?
22:41 ozzloy: nothing shows up in the terminal either
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22:50 asumu: Are you trying the alpha.rkt example?
22:58 ozzloy: asumu, eys
22:58 ozzloy: yes
22:58 asumu: ozzloy: that one didn't work correctly for me either. Try gears.rkt.
22:58 ozzloy: oh
22:58 ozzloy: ok
22:58 ozzloy: thanks
22:58 asumu: (I don't know why, but it worked when I pressed ctrl+c running it on Linux)
22:58 asumu: (so I suspect there is something wrong with alpha.rkt)
23:00 ozzloy: asumu, works for me!
23:00 ozzloy: gears
23:00 ozzloy: asumu, are you saying you did ^C on alpha.rkt?
23:01 asumu: ozzloy: yeah.
23:01 ozzloy: ah
23:01 ozzloy: kk, i'll try that
23:02 ozzloy: nope
23:03 ozzloy: i ^C while the window had focus, while drracket had focus, and then while terminal had focus
23:04 asumu: Okay, well that example is definitely buggy. You could submit a bug report.
23:04 ozzloy: cool
23:04 ozzloy: i'll do so
23:05 ozzloy: i don't have a stack trace or anything
23:05 ozzloy: just "it showed black"
23:05 ozzloy: do you know how i could get more useful info?  or i could leave it at that
23:07 asumu: I'm not sure there's much else to say. Just explain how it occurs and the output that you expect.
23:08 asumu: BTW: it's supposed to show a cube with your image spinning around.
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23:12 RacketCommitBot: [racket/master] make DrRacket run test submodules (in the module language) by default. - Robby Findler
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23:22 ozzloy: asumu, my image?
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23:23 ozzloy: asumu, my webcam turns on or something?
23:26 ozzloy: oh, i see shriram's pic
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