I am trying to write a custom current-read-interaction for a language
with non-s-expression syntax, and I’m not sure I completely understand
the protocol for how to detect the end of input across both the command
line and DrRacket. I first wrote an implementation for DrRacket, which
appears to cont
On 6/6/2016 8:36 PM, David Christiansen wrote:
> That seems overly complicated. Can you not just compare the mouse's
> coordinates to the picture's location in the canvas?
I don't have a good way to know where the picture itself is - only its
bounding box. So if the picture consists of a doughn
If I run this program:
#lang racket
(set 1 2 3)
It prints out the value:
(set 1 2 3)
That's wonderful! It uses nice constructor-style printing, just like I wanted.
That was without changing the printing settings from the default print mode.
However, if I change DrRacket's printing settings to
Why don’t you check the location of the mouse movement? The coordinates are
close enough.
> On Jun 6, 2016, at 4:45 PM, David Raymond Christiansen
> wrote:
>
> Hi all,
>
> I'm looking for a way to check whether a mouse pointer is on top of a
> particular pict that has been drawn to a can
> That seems overly complicated. Can you not just compare the mouse's
> coordinates to the picture's location in the canvas?
I don't have a good way to know where the picture itself is - only its
bounding box. So if the picture consists of a doughnut shape, I want
the center of the doughnut and t
> If I understand the goal, you could render to one bitmap that has an
> alpha channel, and then check whether the pixel under the mouse ends up
> with a non-zero alpha.
That's a good simplification. Thanks!
I had kind of been hoping that there was an alternative approach that
I was missing, but
On 6/6/2016 4:45 PM, David Raymond Christiansen wrote:
I'm looking for a way to check whether a mouse pointer is on top of a
particular pict that has been drawn to a canvas%.
Right now, the best I've been able to do is to render the pict to two
off-screen bitmaps with different background col
At Mon, 6 Jun 2016 16:45:33 -0400, David Raymond Christiansen wrote:
> I'm looking for a way to check whether a mouse pointer is on top of a
> particular pict that has been drawn to a canvas%.
>
> Right now, the best I've been able to do is to render the pict to two
> off-screen bitmaps with dif
Having trouble making the most use of your machine during Racket setup tasks?
Try specifying a non-integer number of CPUs!
clements@desmond:~/git-clements/pkgs/jbc-utils$ raco setup -j 6.972 shelly
Hi all,
I'm looking for a way to check whether a mouse pointer is on top of a
particular pict that has been drawn to a canvas%.
Right now, the best I've been able to do is to render the pict to two
off-screen bitmaps with different background colors, and then check
whether or not the pixel o
Thanks John! We've fixed the front page.
RacketCon registration is now open at (linked from the RacketCon page):
https://www.eventbrite.com/e/racketcon-2016-tickets-24349152972
We're very excited to announce that Emina Torlak will be giving the
keynote this year, on Synthesis and Verification
Strange Loop Registration is opening this Wednesday at Noon, and as I found out
to my chagrin last year, those tickets do sell out *extremely* quickly. I see
that the page for RacketCon is up, but I don’t think I’ve seen notice of it on
the users mailing list, and it also looks to me like the m
> On Jun 6, 2016, at 1:19 PM, Matthew Butterick wrote:
>
>
> On Jun 5, 2016, at 1:33 PM, Matthias Felleisen wrote:
>
>> when I taught a Sw Dev course and the students voted to use JSON as the data
>> exchange language.
>
> I always thought the reason you wisely prefer to keep politics out
Yes, but I think a different protocol will be needed than for
`serializable-struct`.
With
(serializable-struct pond (depth))
it's clear that the deserializer receives a single value for the single
field (or, more generally, N values for N fields). So, it's clear how
to make a compatibility dese
On Jun 5, 2016, at 1:33 PM, Matthias Felleisen wrote:
> when I taught a Sw Dev course and the students voted to use JSON as the data
> exchange language.
I always thought the reason you wisely prefer to keep politics out of
programming was to avoid outcomes like this ;)
--
You received thi
> On Jun 6, 2016, at 8:45 AM, George Neuner wrote:
>
> On Mon, 6 Jun 2016 13:34:41 +0100, Laurent
> wrote:
>
>> Ah, so you meant MrEd Designer (MED) then, I wasn't sure :)
>> (mred was the previous GUI lib, part of DrScheme, whereas MED is an
>> external package)
>
> Sorry for the confusion -
Based on Robby's work tracking down the problem, I've pushed a repair
for the next snapshot build. (I'm surprised that this bug escaped
detection before.)
Since the problem was in file reading, the next snapshot build will
include a repaired DrRacket that is able to read your original file.
Thank
On Mon, 6 Jun 2016 13:34:41 +0100, Laurent
wrote:
>Ah, so you meant MrEd Designer (MED) then, I wasn't sure :)
>(mred was the previous GUI lib, part of DrScheme, whereas MED is an
>external package)
Sorry for the confusion - I wasn't aware that the design editor went
by a different acronym. I a
The GC's printer for `dump-memory-stats` is broken on Windows. It
breaks in different ways depending on the compiler used to build Racket
and for 32-bit vs. 64-bit.
I've pushed a repair for the next snapshot build --- at least for the
Utah snapshot, which uses MSVC. I'll probably have to investiga
1. On Section 14.4, The CK Machine, on page 243, there is a reference to
/part I(6.4)/, mentioning the specification for the CK Machine: "Comparing
the Redex specification with the specification in part I(6.4)".
But I believe /part I(6.4)/ is about the CEK Machine. The CK Machine is the
在 2016年6月6日星期一 UTC+8下午8:34:00，Robby Findler写道：
> I'm not sure what happened, but there seems to be a bug in the way
> DrRacket reads files somehow. I've not figured out exactly what that
> is (but it appears to be somewhere in the get-a-string method in the
> editor-stream-in% class).
>
> Meanwhil
Ah, so you meant MrEd Designer (MED) then, I wasn't sure :)
(mred was the previous GUI lib, part of DrScheme, whereas MED is an
external package)
Actually, it doesn't look like it was created by MED to me, at least not my
versions (3.x), which generate only text files anyway (I think the previous
I'm not sure what happened, but there seems to be a bug in the way
DrRacket reads files somehow. I've not figured out exactly what that
is (but it appears to be somewhere in the get-a-string method in the
editor-stream-in% class).
Meanwhile, I'm attaching a recovered version of the file. The only
The file seems to be corrupt around line 1186, causing DrRacket to get
confused as it tries to read in snip #333. Looking at the file, it
seems like there should be a way to repair it at that point that will
cause it to be openable in DrRacket, since the content following that
seems to be reasonabl
I just realized that you are the author (or at least maintainer) of
MrEd-Designer ... so you would know if that file was created by it.
:-)
George
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On 6/6/2016 6:29 AM, Laurent wrote:
Although the file says:
"Open this file in DrRacket version 6.5 or later to read it."
So it doesn't look like it requires an old version of Racket. (not
really helping, sorry)
Yes, I was focused on other contents. But even if the file was created
by 6.5,
Although the file says:
"Open this file in DrRacket version 6.5 or later to read it."
So it doesn't look like it requires an old version of Racket. (not really
helping, sorry)
On Mon, Jun 6, 2016 at 9:00 AM, George Neuner wrote:
> On 6/6/2016 3:27 AM, 张可星 wrote:
>
>> I don't have MrEd installed
On 6/6/2016 3:27 AM, 张可星 wrote:
I don't have MrEd installed, too.I think it is vim
Did you have MrEd installed previously in another version of Racket? I
think you mentioned that this was an old file you were trying to open.
Your file is in a custom format defined by (lib"read.ss""wxme").
I don't have MrEd installed, too.I think it is vim
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On 6/6/2016 2:51 AM, 张可星 wrote:
在 2016年6月6日星期一 UTC+8下午2:45:34，gneuner2写道：
> On 6/6/2016 2:32 AM, 张可星 wrote:
> > > Open the file with a text editor and insert a blank line at the
> > > beginning. Then DrRacket will open it. I haven't seen this particular
> > > issue previously, but obviously DrR
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