[racket-dev] multiple key-press
I just spoke with a room of high-school students studying Universe programming in a summer course at Brown. One major complaint was that they couldn't do multi-key-presses. For instance, they want to use WASD navigation combined with a right-side key for firing, and want to be able to fire and navigate at the same time. They've been using Shift, but the general consensus amongst the kids was this was Not Cool. Basically, they felt like they were being cheated out of building a real game. I don't know what it would take to support this. Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] multiple key-press
As far as I know, at the lowest level there is no multiple key press event even in the OS. If they want to do that, they should change their world to record the current key press state: (define-struct the-world (keys . everything-else)) and at the start of `on-tick' look at the collective impact of all the keys, resetting it to 'empty' when the new world is returned. That's more like how actually game engines work anyways. Jay On Thu, Jul 22, 2010 at 7:25 AM, Shriram Krishnamurthi s...@cs.brown.edu wrote: I just spoke with a room of high-school students studying Universe programming in a summer course at Brown. One major complaint was that they couldn't do multi-key-presses. For instance, they want to use WASD navigation combined with a right-side key for firing, and want to be able to fire and navigate at the same time. They've been using Shift, but the general consensus amongst the kids was this was Not Cool. Basically, they felt like they were being cheated out of building a real game. I don't know what it would take to support this. Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev -- Jay McCarthy j...@cs.byu.edu Assistant Professor / Brigham Young University http://teammccarthy.org/jay The glory of God is Intelligence - DC 93 _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] multiple key-press
I have considered this issue. I decided that these kinds of kids should be introduced to Universe programs as opposed to World programs. That's way cooler than silly one-keyboard games. -- Matthias On Jul 22, 2010, at 9:29 AM, Jay McCarthy wrote: As far as I know, at the lowest level there is no multiple key press event even in the OS. If they want to do that, they should change their world to record the current key press state: (define-struct the-world (keys . everything-else)) and at the start of `on-tick' look at the collective impact of all the keys, resetting it to 'empty' when the new world is returned. That's more like how actually game engines work anyways. Jay On Thu, Jul 22, 2010 at 7:25 AM, Shriram Krishnamurthi s...@cs.brown.edu wrote: I just spoke with a room of high-school students studying Universe programming in a summer course at Brown. One major complaint was that they couldn't do multi-key-presses. For instance, they want to use WASD navigation combined with a right-side key for firing, and want to be able to fire and navigate at the same time. They've been using Shift, but the general consensus amongst the kids was this was Not Cool. Basically, they felt like they were being cheated out of building a real game. I don't know what it would take to support this. Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev -- Jay McCarthy j...@cs.byu.edu Assistant Professor / Brigham Young University http://teammccarthy.org/jay The glory of God is Intelligence - DC 93 _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] multiple key-press
As far as I know, at the lowest level there is no multiple key press event even in the OS. Yes, that's why I had scare-quotes in my message. If they want to do that, they should change their world to record the current key press state: I told them that. But the problem is that inversion of control makes the world structure and its logic *significantly* uglier. I have considered this issue. I decided that these kinds of kids should be introduced to Universe programs as opposed to World programs. That's way cooler than silly one-keyboard games. Doom is silly? Duke Nukem 3D is silly? Perhaps you do indeed know a great deal about games. But perhaps you have a more limited understanding of your audience. Shriram _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] multiple key-press
On Jul 22, 2010, at 9:38 AM, Shriram Krishnamurthi wrote: I have considered this issue. I decided that these kinds of kids should be introduced to Universe programs as opposed to World programs. That's way cooler than silly one-keyboard games. Doom is silly? Duke Nukem 3D is silly? Perhaps you do indeed know a great deal about games. But perhaps you have a more limited understanding of your audience. This issue came up at NEU at some point, and when we showed the kids Universe in response, they though it was way cooler to run the multi-player game on many computers than on a single keyboard. (I don't know whether they implemented it.) _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] multiple key-press
On Thu, Jul 22, 2010 at 7:38 AM, Shriram Krishnamurthi s...@cs.brown.edu wrote: As far as I know, at the lowest level there is no multiple key press event even in the OS. Yes, that's why I had scare-quotes in my message. If they want to do that, they should change their world to record the current key press state: I told them that. But the problem is that inversion of control makes the world structure and its logic *significantly* uglier. We could change world/universe to automatically do this batching of key presses and have an interaction-rate similar to the tick-rate. I'm not sure THAT would be much better, but it would be less tedious, etc. Jay I have considered this issue. I decided that these kinds of kids should be introduced to Universe programs as opposed to World programs. That's way cooler than silly one-keyboard games. Doom is silly? Duke Nukem 3D is silly? Perhaps you do indeed know a great deal about games. But perhaps you have a more limited understanding of your audience. Shriram -- Jay McCarthy j...@cs.byu.edu Assistant Professor / Brigham Young University http://teammccarthy.org/jay The glory of God is Intelligence - DC 93 _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] [plt] Push #20751: master branch updated
This commit finishes adding 'define-datatype' and 'match' to ASL per Shriram's request. I'd like comments and improvements on a few things: 1) The documentation -- most of the ASL docs are very vague, presumably because the book covers it, but in this case that's not true 2) The subset of match supported 3) The way I've prevented escaping to the larger part of ASL. Jay On Thu, Jul 22, 2010 at 3:40 PM, j...@racket-lang.org wrote: jay has updated `master' from 9eb053d4db to 407dcee206. http://git.racket-lang.org/plt/9eb053d4db..407dcee206 =[ 2 Commits ]== Directory summary: 45.5% collects/lang/private/ 15.2% collects/scribblings/htdp-langs/ 38.1% collects/tests/racket/ ~~ eeada45 Jay McCarthy j...@racket-lang.org 2010-07-22 15:12 : | Fixing error string : M collects/lang/private/teachprims.rkt | 2 +- ~~ 407dcee Jay McCarthy j...@racket-lang.org 2010-07-22 15:39 : | Adding match to ASL : M collects/lang/htdp-advanced.rkt | 1 + M collects/lang/posn.rkt | 1 + M collects/lang/private/teach.rkt | 133 - M collects/scribblings/htdp-langs/advanced.scrbl | 48 +++- M collects/tests/racket/advanced.rktl | 96 +++ M collects/tests/racket/bega-adv.rktl | 10 -- M collects/tests/racket/beg-adv.rktl | 7 - =[ Overall Diff ]=== collects/lang/htdp-advanced.rkt ~~~ --- OLD/collects/lang/htdp-advanced.rkt +++ NEW/collects/lang/htdp-advanced.rkt @@ -48,6 +48,7 @@ [advanced-when when] [advanced-unless unless] [advanced-case case] + [advanced-match match] [advanced-delay delay] [advanced-module-begin #%module-begin] ) collects/lang/posn.rkt ~~ --- OLD/collects/lang/posn.rkt +++ NEW/collects/lang/posn.rkt @@ -4,6 +4,7 @@ ;; The posn struct for the teaching languages (provide struct:posn make-posn posn? posn-x posn-y set-posn-x! set-posn-y! + (rename-out (posn posn-id)) (rename-out (posn-signature posn))) (struct posn (x y) #:mutable #:transparent) collects/lang/private/teach.rkt ~~~ --- OLD/collects/lang/private/teach.rkt +++ NEW/collects/lang/private/teach.rkt @@ -49,7 +49,10 @@ (rename deinprogramm/quickcheck/quickcheck quickcheck:property property) test-engine/scheme-tests scheme/class - (only lang/private/teachprims beginner-equal? beginner-equal~?)) + ../posn.rkt + (only lang/private/teachprims + beginner-equal? beginner-equal~? + advanced-cons advanced-list*)) (require-for-syntax teachhelp.ss teach-shared.ss syntax/kerncase @@ -209,6 +212,7 @@ advanced-begin advanced-begin0 advanced-case + advanced-match advanced-shared advanced-delay) @@ -2520,6 +2524,133 @@ (with-syntax ([clauses clauses]) (syntax/loc stx (case v-expr . clauses)] [_else (bad-use-error 'case stx)] + + ;; match (advanced) + (define (advanced-match/proc stx) + (ensure-expression + stx + (lambda () + (syntax-case stx () + [(_) + (teach-syntax-error + 'match + stx + #f + expected an expression after `match', but nothing's there)] + [(_ expr) + (teach-syntax-error + 'match + stx + #f + expected a pattern--answer clause after the expression following `match', but nothing's there)] + [(_ v-expr clause ...) + (let ([clauses (syntax-list (syntax (clause ...)))]) + (for-each + (lambda (clause) + (syntax-case clause () + [(pattern answer ...) + (let ([pattern (syntax pattern)] + [answers (syntax-list (syntax (answer ...)))]) + (check-single-expression 'match + for the answer in a `match' clause + clause + answers + null))] + [() + (teach-syntax-error + 'match + stx + clause + expected a pattern--answer clause, but found an empty clause)] +
Re: [racket-dev] multiple key-press
On Thu, Jul 22, 2010 at 6:43 AM, Jay McCarthy jay.mccar...@gmail.comwrote: On Thu, Jul 22, 2010 at 7:38 AM, Shriram Krishnamurthi s...@cs.brown.edu wrote: As far as I know, at the lowest level there is no multiple key press event even in the OS. Not that there is a multiple key press event in OS, but below are some potential solutions/examples in other languages: Here's a potential solution in C# describing looking up keyboard states via kernel32.dll - not sure whether it will easily be applicable/ported in your scenario. http://stackoverflow.com/questions/2686019/multiple-key-presses-doing-different-events-in-c Processing also appear to handle multiple keypress (code): http://wiki.processing.org/index.php?title=Keep_track_of_multiple_key_presses Here's one demo in flash with WASD - but did not show firing: http://www.freeactionscript.com/2009/02/multiple-key-press-detection/ Cheers, yc _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] Can't Find a Workaround for Bug 11017 in DrRacket
At Wed, 21 Jul 2010 17:09:03 -0600, Matthew Flatt wrote: I've pushed a change to the git repo that I don't think will fix the problem, but I think it will give us better information when you get a chance to try it. The new error message provoked a bug report that led to a repair. So, please try the latest and let me know if the problem is fixed. _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
[racket-dev] Getting old versions of PLT Scheme
To fix a backwards compatibility bug, I just had to go download PLT Scheme 4.2.4. It's a real pain to do so. First, the Racket site doesn't seem to link to versions before 5.0. I had to go to plt-scheme.org manually. It'd be nice if I could get to the whole history in one place. Second, at plt-scheme.org, the window is covered by a misshapen dialog telling me to go to the Racket site. I have put a picture of the misshapen window up at http://www.ccs.neu.edu/home/cce/racket-dialog.png (this from Firefox 3.6.2 on Intel Mac). Third, it takes several clicks to get to the 4.2.4 download, and at each click the dialog pops back up again. Our site(s) would be easier to get around if any or all of these were fixed: old versions from the Racket Download page, an easier to read redirection dialog, and only seeing that dialog once per visit. Carl Eastlund _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
