[9fans] How to take a portion of a screenshot

[9fans] How to take a portion of a screenshot

[Chris McGee]

Hi All,

I'm working on some documentation and would like to include a portion of the screen in a particular window. What's a good way to take the shot but also snip out the piece that I'm interested in?

Thanks,
Chris

Re: [9fans] How to take a portion of a screenshot

[Adriano Verardo]

I usually run Plan9 in a vm under Win7.

Chris McGee wrote:
> Hi All,
>
> I'm working on some documentation and would like to include a portion of the screen in a particular window. What's a good way to take the shot but also snip out the piece that I'm interested in?
>
> Thanks,
> Chris
>

Re: [9fans] How to take a portion of a screenshot

[Richard Miller]

> I'm working on some documentation and would like to include a portion of the screen in a particular window. What's a good way to take the shot but also snip out the piece that I'm interested in?

Making a screenshot is one of those delightful examples of
the elegant simplicity of Plan 9:

    cat /dev/screen >screenshot.pic

To select a rectangle from an image you can use crop(1)

Re: [9fans] How to take a portion of a screenshot

[hiro]

can't you take something like /dev/wsys/123/window ?

On 11/23/16, Richard Miller <9fans@hamnavoe.com> wrote:
>> I'm working on some documentation and would like to include a portion of
>> the screen in a particular window. What's a good way to take the shot but
>> also snip out the piece that I'm interested in?
>
> Making a screenshot is one of those delightful examples of
> the elegant simplicity of Plan 9:
>
>     cat /dev/screen >screenshot.pic
>
> To select a rectangle from an image you can use crop(1)
>
>
>

Re: [9fans] How to take a portion of a screenshot

[Chris McGee]

Thanks Richard,

That is the kind of thing I was looking for. And yes, it's one of the reasons I'm liking plan 9. Each piece does one thing we'll.

Chris

On Nov 23, 2016, at 11:06 AM, Richard Miller <9fans@hamnavoe.com> wrote:

>> I'm working on some documentation and would like to include a portion of the screen in a particular window. What's a good way to take the shot but also snip out the piece that I'm interested in?
> 
> Making a screenshot is one of those delightful examples of
> the elegant simplicity of Plan 9:
> 
>    cat /dev/screen >screenshot.pic
> 
> To select a rectangle from an image you can use crop(1)
> 
> 

Re: [9fans] How to take a portion of a screenshot

[Skip Tavakkolian]

[-- Attachment #1: Type: text/plain, Size: 67 bytes --]

> it's one of the reasons I'm liking plan 9.

ingenious glenda.

[-- Attachment #2: window.jpg --]
[-- Type: image/jpeg, Size: 9622 bytes --]

Re: [9fans] How to take a portion of a screenshot

[Benjamin Purcell]

even simpler:

tojpg < /mnt/wsys/window > window.jpg

On Wed, Nov 23, 2016 at 2:07 PM, Skip Tavakkolian <9nut@9netics.com> wrote:
>> it's one of the reasons I'm liking plan 9.
>
> ingenious glenda.

Re: [9fans] How to take a portion of a screenshot

[James A. Robinson]

[-- Attachment #1: Type: text/plain, Size: 213 bytes --]

On Wed, Nov 23, 2016 at 12:33 PM Benjamin Purcell <benjapurcell@gmail.com>
wrote:
> even simpler:
>
> tojpg < /mnt/wsys/window > window.jpg

Simpler because you're capturing a specific window in this case?

[-- Attachment #2: Type: text/html, Size: 352 bytes --]

Re: [9fans] How to take a portion of a screenshot

[hiro]

i have a slightly related question: how do i find out an other
window's window id if there is no shell temporarily available? e.g.
doom is running inside.

Re: [9fans] How to take a portion of a screenshot

[Skip Tavakkolian]

>> tojpg < /mnt/wsys/window > window.jpg
>
> Simpler because you're capturing a specific window in this case?

yes. from rio(1):

"/mnt/wsys              Files served by rio (also unioned in
                                 /dev in a window's name space, before
                                 the terminal's real /dev files)"

Re: [9fans] How to take a portion of a screenshot

[Skip Tavakkolian]

> i have a slightly related question: how do i find out an other
> window's window id if there is no shell temporarily available? e.g.
> doom is running inside.

maybe 'grep doom /dev/wsys/*/label' ?

Re: [9fans] How to take a portion of a screenshot

[Jules Merit]

[-- Attachment #1.1: Type: text/plain, Size: 480 bytes --]

I ported doom, after someone Runed plan9. Trying to get 9front Jurassic
Park on MIPS r12k now.

Also plan9 clearly needs EEG for user defined scheduler and jukebox
selection whilst in the labs.

On Nov 23, 2016 12:57 PM, "Skip Tavakkolian" <9nut@9netics.com> wrote:

> i have a slightly related question: how do i find out an other
> window's window id if there is no shell temporarily available? e.g.
> doom is running inside.

maybe 'grep doom /dev/wsys/*/label' ?

[-- Attachment #1.2: Type: text/html, Size: 846 bytes --]

[-- Attachment #2: IMG_20161123_132346.jpg --]
[-- Type: image/jpeg, Size: 4801274 bytes --]

[-- Attachment #3: IMG_20161123_132431.jpg --]
[-- Type: image/jpeg, Size: 3613827 bytes --]

Re: [9fans] How to take a portion of a screenshot

[Steve Simon]

[-- Attachment #1: Type: text/plain, Size: 770 bytes --]


kudos for the use of m4.

sadly my o2s went the way of ebay years ago, nice machines though.

-Steve


> On 23 Nov 2016, at 21:30, Jules Merit <jules.merit.eurocorp.us@gmail.com> wrote:
> 
> I ported doom, after someone Runed plan9. Trying to get 9front Jurassic Park on MIPS r12k now.
> 
> Also plan9 clearly needs EEG for user defined scheduler and jukebox selection whilst in the labs.
> 
> 
> On Nov 23, 2016 12:57 PM, "Skip Tavakkolian" <9nut@9netics.com> wrote:
> > i have a slightly related question: how do i find out an other
> > window's window id if there is no shell temporarily available? e.g.
> > doom is running inside.
> 
> maybe 'grep doom /dev/wsys/*/label' ?
> 
> 
> 
> <IMG_20161123_132346.jpg>
> <IMG_20161123_132431.jpg>

[-- Attachment #2: Type: text/html, Size: 1513 bytes --]

Re: [9fans] How to take a portion of a screenshot

[Jules Merit]

[-- Attachment #1: Type: text/plain, Size: 894 bytes --]

Thanks I bought one.
/REMdmr

On Nov 23, 2016 1:59 PM, "Steve Simon" <steve@quintile.net> wrote:

>
> kudos for the use of m4.
>
> sadly my o2s went the way of ebay years ago, nice machines though.
>
> -Steve
>
>
> On 23 Nov 2016, at 21:30, Jules Merit <jules.merit.eurocorp.us@gmail.com>
> wrote:
>
> I ported doom, after someone Runed plan9. Trying to get 9front Jurassic
> Park on MIPS r12k now.
>
> Also plan9 clearly needs EEG for user defined scheduler and jukebox
> selection whilst in the labs.
>
> On Nov 23, 2016 12:57 PM, "Skip Tavakkolian" <9nut@9netics.com> wrote:
>
> > i have a slightly related question: how do i find out an other
> > window's window id if there is no shell temporarily available? e.g.
> > doom is running inside.
>
> maybe 'grep doom /dev/wsys/*/label' ?
>
>
>
> <IMG_20161123_132346.jpg>
>
> <IMG_20161123_132431.jpg>
>
>

[-- Attachment #2: Type: text/html, Size: 1901 bytes --]

Re: [9fans] How to take a portion of a screenshot

[Chris McGee]

I tried to write an rc script that would make a screen video as an animated gif. I have something that almost works, but ran into a few problems/limitations.

* I can’t seem to find a way to have an incrementing loop counter in rc shell (best I could do is check the size of a growing list variable)
* The gif command barfs when the GIF is any larger than a few megabytes due to an allocation error
* I couldn’t think of a good way to name the image files so that they can be sorted into the correct sequence as input to togif

I’ll try banging my head on the solution again tomorrow. I’m hoping that either it can be a one-liner of rc shell scripting or put into a full utility script (e.g. recscreen) that anyone could use.

Thanks,
Chris

> On Nov 23, 2016, at 3:07 PM, Skip Tavakkolian <9nut@9netics.com> wrote:
> 
>> it's one of the reasons I'm liking plan 9.
> 
> ingenious glenda.
> <window.jpg>

Re: [9fans] How to take a portion of a screenshot

[Skip Tavakkolian]

> * I can’t seem to find a way to have an incrementing loop counter in rc shell (best I could do is check the size of a growing list variable)

most of the time seq(1), hoc(1) and similar tools can help do the job:

fn square {
	echo $1 '*' $1 | hoc
}

for (i in `{seq 1 10}) {
	j = `{square $i}
	echo $i^² '=' $j
}


> * I couldn’t think of a good way to name the image files so that they can be sorted into the correct sequence as input to togif

awk printf perhaps?

for (i in (0 10 100)) {
	echo $i
} | awk '{printf "image_%0.3d\n", $0}'

Re: [9fans] How to take a portion of a screenshot

[cinap_lenrek]

rc variables are lists, and $#var evalulates to the
length of the list... you can use that to make counters
by concatenating elements to a list:

term% a=() while(! ~ $#a 13){echo $#a $a; a=(1 $a);}
0
1 1
2 1 1
3 1 1 1
4 1 1 1 1
5 1 1 1 1 1
6 1 1 1 1 1 1
7 1 1 1 1 1 1 1
8 1 1 1 1 1 1 1 1
9 1 1 1 1 1 1 1 1 1
10 1 1 1 1 1 1 1 1 1 1
11 1 1 1 1 1 1 1 1 1 1 1
12 1 1 1 1 1 1 1 1 1 1 1 1

--
cinap

Re: [9fans] How to take a portion of a screenshot

[Chris McGee]

Thanks Skip, Cinap,

This command seems to be working quite nicely (except for the memory allocation problem in gif(1) for larger recordings):

for (i in `{seq -w 1 25}) { sleep 0.01; cat /dev/screen > /tmp/screen-$i.img }; togif -l -1 -d 300 /tmp/screen-*.img > /tmp/recording.gif; rm /tmp/screen-*.img; echo Done

It would be easy enough to introduce a crop to restrict the recording to a particular window or area of the screen.

Is there a way to capture the current mouse position without blocking to wait on an event from /dev/mouse? I was thinking that it would be interesting to crop around the current mouse position.

Chris


> On Nov 24, 2016, at 3:56 AM, cinap_lenrek@felloff.net wrote:
> 
> rc variables are lists, and $#var evalulates to the
> length of the list... you can use that to make counters
> by concatenating elements to a list:
> 
> term% a=() while(! ~ $#a 13){echo $#a $a; a=(1 $a);}
> 0
> 1 1
> 2 1 1
> 3 1 1 1
> 4 1 1 1 1
> 5 1 1 1 1 1
> 6 1 1 1 1 1 1
> 7 1 1 1 1 1 1 1
> 8 1 1 1 1 1 1 1 1
> 9 1 1 1 1 1 1 1 1 1
> 10 1 1 1 1 1 1 1 1 1 1
> 11 1 1 1 1 1 1 1 1 1 1 1
> 12 1 1 1 1 1 1 1 1 1 1 1 1
> 
> --
> cinap
> 

Re: [9fans] How to take a portion of a screenshot

[Skip Tavakkolian]

[-- Attachment #1: Type: text/plain, Size: 1625 bytes --]

Nice. Looking at jpg(1) sources, it's not obvious where the allocation
limit comes in. Too bad there isn't an encoder for vp8.

for mouse position, you may need to write a shim to snoop on the mouse;
something like this:
https://github.com/9nut/plan9/tree/master/tippy



On Fri, Nov 25, 2016 at 8:23 PM Chris McGee <newton688@gmail.com> wrote:

> Thanks Skip, Cinap,
>
> This command seems to be working quite nicely (except for the memory
> allocation problem in gif(1) for larger recordings):
>
> for (i in `{seq -w 1 25}) { sleep 0.01; cat /dev/screen >
> /tmp/screen-$i.img }; togif -l -1 -d 300 /tmp/screen-*.img >
> /tmp/recording.gif; rm /tmp/screen-*.img; echo Done
>
> It would be easy enough to introduce a crop to restrict the recording to a
> particular window or area of the screen.
>
> Is there a way to capture the current mouse position without blocking to
> wait on an event from /dev/mouse? I was thinking that it would be
> interesting to crop around the current mouse position.
>
> Chris
>
>
> > On Nov 24, 2016, at 3:56 AM, cinap_lenrek@felloff.net wrote:
> >
> > rc variables are lists, and $#var evalulates to the
> > length of the list... you can use that to make counters
> > by concatenating elements to a list:
> >
> > term% a=() while(! ~ $#a 13){echo $#a $a; a=(1 $a);}
> > 0
> > 1 1
> > 2 1 1
> > 3 1 1 1
> > 4 1 1 1 1
> > 5 1 1 1 1 1
> > 6 1 1 1 1 1 1
> > 7 1 1 1 1 1 1 1
> > 8 1 1 1 1 1 1 1 1
> > 9 1 1 1 1 1 1 1 1 1
> > 10 1 1 1 1 1 1 1 1 1 1
> > 11 1 1 1 1 1 1 1 1 1 1 1
> > 12 1 1 1 1 1 1 1 1 1 1 1 1
> >
> > --
> > cinap
> >
>
>
>

[-- Attachment #2: Type: text/html, Size: 2913 bytes --]

Re: [9fans] How to take a portion of a screenshot

[erik quanstrom]

On Wed Nov 23 13:50:02 PST 2016, jules.merit.eurocorp.us@gmail.com wrote:


> I ported doom, after someone Runed plan9. Trying to get 9front Jurassic
> Park on MIPS r12k now.
>
> Also plan9 clearly needs EEG for user defined scheduler and jukebox
> selection whilst in the labs.
>

as soon as i saw the first "dnl", i gave up.

- erik