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devel / comp.lang.tcl / Image create from barchart is always 400x400

SubjectAuthor
* Image create from barchart is always 400x400Cecil Westerhof
`* Image create from barchart is always 400x400Scott Pitcher
 `- Image create from barchart is always 400x400Cecil Westerhof

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Image create from barchart is always 400x400

<8734xbw3a8.fsf@munus.decebal.nl>

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From: Cecil@decebal.nl (Cecil Westerhof)
Newsgroups: comp.lang.tcl
Subject: Image create from barchart is always 400x400
Date: Sun, 12 Nov 2023 13:43:11 +0100
Organization: Decebal Computing
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 by: Cecil Westerhof - Sun, 12 Nov 2023 12:43 UTC

I have the following code:
wm title . "YouTube Weekly Views"
blt::barchart .bc -plotbackground black
.bc axis configure y -stepsize 100
.bc element create best -xdata ${weekArr} -ydata ${viewsArr} -label {}
pack .bc -side top -expand yes -fill both

# Create a image to hold the graph, use the "snap" subcommand and then
# write the image to a file.
image create photo snapshot
.bc snap snapshot
snapshot write ${directory}${imageName} -format png
# Display the barchart
exec gwenview ${directory}${imageName} &
# exit

My views are going up and so are the weeks, but the generated image is
always 400x400.
The barchart itself is expanding, which I saw when putting the exit
into comment.
(At the moment I am only interested in the graphic file.)
So why does snapshot not honour the dimensions of the barchart?

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

Re: Image create from barchart is always 400x400

<20231115085803.3625f3c1@officepc.svpts>

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From: scotty@svptechnicalservices.com.au (Scott Pitcher)
Newsgroups: comp.lang.tcl
Subject: Re: Image create from barchart is always 400x400
Date: Wed, 15 Nov 2023 08:58:03 +1100
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 by: Scott Pitcher - Tue, 14 Nov 2023 21:58 UTC

On Sun, 12 Nov 2023 13:43:11 +0100
Cecil Westerhof <Cecil@decebal.nl> wrote:

> I have the following code:
> wm title . "YouTube Weekly Views"
> blt::barchart .bc -plotbackground black
> .bc axis configure y -stepsize 100
> .bc element create best -xdata ${weekArr} -ydata
> ${viewsArr} -label {} pack .bc -side top -expand yes
> -fill both
>
> # Create a image to hold the graph, use the "snap" subcommand and
> then # write the image to a file.
> image create photo snapshot
> .bc snap snapshot
> snapshot write ${directory}${imageName} -format png
> # Display the barchart
> exec gwenview ${directory}${imageName} &
> # exit
>
> My views are going up and so are the weeks, but the generated image is
> always 400x400.
> The barchart itself is expanding, which I saw when putting the exit
> into comment.
> (At the moment I am only interested in the graphic file.)
> So why does snapshot not honour the dimensions of the barchart?
>

Hi Cecil,

To change the window size, add a -width and/or -height option to the
barchart, such as:

blt::barchart .bc -plotbackground black -width 1000 -height 300

or:

..bc configure -width 1000 -height 300

You won't get a snapshot the correct size just yet, so before you
say snap:

update idletasks

Then the window AND the snapshot image will be correct.

So:
..bc configure -width 1000 -height 300
update idletasks
image create photo snapshot
..bc snap snapshot
snapshot write ${directory}${imageName} -format png

Kind regards,
Scott

--

Re: Image create from barchart is always 400x400

<87edgruxe5.fsf@munus.decebal.nl>

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From: Cecil@decebal.nl (Cecil Westerhof)
Newsgroups: comp.lang.tcl
Subject: Re: Image create from barchart is always 400x400
Date: Wed, 15 Nov 2023 11:24:50 +0100
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 by: Cecil Westerhof - Wed, 15 Nov 2023 10:24 UTC

Scott Pitcher <scotty@svptechnicalservices.com.au> writes:

> On Sun, 12 Nov 2023 13:43:11 +0100
> Cecil Westerhof <Cecil@decebal.nl> wrote:
>
>> I have the following code:
>> wm title . "YouTube Weekly Views"
>> blt::barchart .bc -plotbackground black
>> .bc axis configure y -stepsize 100
>> .bc element create best -xdata ${weekArr} -ydata
>> ${viewsArr} -label {} pack .bc -side top -expand yes
>> -fill both
>>
>> # Create a image to hold the graph, use the "snap" subcommand and
>> then # write the image to a file.
>> image create photo snapshot
>> .bc snap snapshot
>> snapshot write ${directory}${imageName} -format png
>> # Display the barchart
>> exec gwenview ${directory}${imageName} &
>> # exit
>>
>> My views are going up and so are the weeks, but the generated image is
>> always 400x400.
>> The barchart itself is expanding, which I saw when putting the exit
>> into comment.
>> (At the moment I am only interested in the graphic file.)
>> So why does snapshot not honour the dimensions of the barchart?
>>
>
> To change the window size, add a -width and/or -height option to the
> barchart, such as:
>
> blt::barchart .bc -plotbackground black -width 1000 -height 300
>
> or:
>
> .bc configure -width 1000 -height 300

That is not really necessary, because the window itself has a good
size. (For no at least.)

> You won't get a snapshot the correct size just yet, so before you
> say snap:
>
> update idletasks

That is what I needed. :-D

I now have:
pack .bc -side top -expand yes -fill both

# Create a image to hold the graph, use the "snap" subcommand and then
# write the image to a file.
# Make sure the snapshot has the right size
update idletasks
image create photo snapshot
.bc snap snapshot
snapshot write ${directory}${imageName} -format png

Thank you very much,

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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