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

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On Sun, 12 Nov 2023 13:43:11 +0100
Cecil Westerhof <[email protected]> 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



--

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Scott Pitcher <[email protected]> writes:

On Sun, 12 Nov 2023 13:43:11 +0100
Cecil Westerhof <[email protected]> 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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