Introducing weewx-svg2png generator for creating thumbnail images and mini-pics in WeeWX

Karen K

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Oct 3, 2023, 10:15:11 AM10/3/23

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If there is a link in a social media post, sites like Twitter (X), Mastodon and others show a preview image or thumbnail of the linked page. For a long time I wondered how to define that image. Then I found out they look for special "meta" statements within the page header. I included such statements in my weather website, and indeed, the respective images were displayed.

I used a screenshot for that purpose. But the screenshot said 3,8°C, and it's summer time and temperatures are much higher. And I wondered how to get actual data into that screenshot. So I thought I could create an SVG file using the CheetahGenerator functionality of WeeWX, and convert it to PNG afterwards. I found the CairoSVG package to do the converting job.

But how to do the conversion after WeeWX created the SVG file, but before WeeWX sends the data to the web server?

The answer is to write a generator for use in skins. And that's it: weewx-svg2png

Now I look what is happening, and meanwhile I publish the generator here.

Stefan Gliessmann

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Oct 5, 2023, 8:21:44 AM10/5/23

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Awesome!

I will give it a shoot later and let you know :)

Thanks in advance for your contributions!!!!

Karen K

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Oct 7, 2023, 2:47:53 AM10/7/23

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I added another example. It shows how to put WeeWX weather data onto a webcam picture.

Webcam picture with WeeWX weather readings

Lorin Tremblay

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Oct 7, 2023, 8:41:03 PM10/7/23

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I'm personally getting this error when I try to install it

Request to install '/home/pi/Desktop/weewx-svg2png.zip'

Extracting from zip archive /home/pi/Desktop/weewx-svg2png.zip

Traceback (most recent call last):

File "/usr/share/weewx/wee_extension", line 92, in <module>

main()

File "/usr/share/weewx/wee_extension", line 84, in main

ext.install_extension(options.install)

File "/usr/share/weewx/weecfg/extension.py", line 130, in install_extension

self.install_from_dir(extension_dir)

File "/usr/share/weewx/weecfg/extension.py", line 150, in install_from_dir

installer_path, installer = weecfg.get_extension_installer(extension_dir)

File "/usr/share/weewx/weecfg/__init__.py", line 1904, in get_extension_installer

installer = loader()

File "/var/tmp/weewx-svg2png-master/install.py", line 8, in loader

File "/var/tmp/weewx-svg2png-master/install.py", line 12, in __init__

NameError: name 'SNMPInstaller' is not defined

I personally want to add the weather data to snapshot of my webcam…

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Karen K

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Oct 8, 2023, 1:45:55 AM10/8/23

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I uploaded a fix. Please try again.

You can also copy svg2png.py to /usr/share/weewx/user by hand.

Lorin Tremblay

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Oct 8, 2023, 12:00:27 PM10/8/23

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Thank was able to install it, now I know I’m close but I’m missing something.

Trying to add the info to my webcam with belchertown skins

Here is my webcam file path.

/var/www/html/weewx/webcam/snap.jpg

Here is the content of my snap.svg.tmpl

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<style>

text {

font-family: Roboto, sans-serif;

font-weight: 300;

line-height: 1.625;

margin: 0;

font-size: 48px;

fill: white;

}

</style>

## webcam image

## readings

<text x="2400" y="1450" text-anchor="middle">$current.outTemp $current.windSpeed $current.barometer</text>

</svg>

And here is the skin.conf

[SVGtoPNGGenerator]

[[file1]]

# file name without extension (optional)

file = /var/www/html/weewx/webcam/snap

# image width in pixels (optional)

#width = replace_me

# image height in pixels (optional)

#height = replace_me

[[[file1]]]

template = snap.svg.tmpl

[Generators]

generator_list = weewx.cheetahgenerator.CheetahGenerator, weewx.reportengine.CopyGenerator, user.belchertown.HighchartsJsonGenerator, user.svg2png.SVGtoPNGGenerator

The .svg is getting created but not the png….

Is there something to do with files path?

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/40aa1301-9c54-4210-a9c1-5d21f46a9cf0n%40googlegroups.com.

Karen K

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Oct 8, 2023, 2:59:00 PM10/8/23

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There is a path problem. First, use "file" with a relative path, i.e. without "/var/www/html/weewx". Then, according to the template "snap.svg" is situated in the base directory (I guess "/var/www/html/weewx"). But you look for it in the "webcam" sub-directory.

So

move the template "snap.svg.tmpl" to the "webcam" sub-directory in your skin directory (something like "/etc/weewx/skins/...").
Change the template line to "template = webcam/snap.svg.tmpl".
Change the file line to "file = webcam/snap".
Double check "href="/webcam/snap.jpg"". Are you sure that is situated in the root directory? May be you want to remove the slash at the beginning.

Lorin Tremblay

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Oct 9, 2023, 5:04:00 PM10/9/23

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Ok now I’m generating a .png with the info in the right position, but the image is not present

So now I’m my webcam folder I have to orignal jpg image, a svg and a png with the text and no pictures.

I have done everything mentioned

move the template "snap.svg.tmpl" to the "webcam" sub-directory in your skin directory (something like "/etc/weewx/skins/...”).à

So now the snap.svg.tmpl is residing in /etc/weewx/skins/Belchertown/webcam

Change the template line to "template = webcam/snap.svg.tmpl”.

Changed that in the skin.conf

Change the file line to "file = webcam/snap".

Changed that in the skin.conf

Double check "href="/webcam/snap.jpg"". Are you sure that is situated in the root directory? May be you want to remove the slash at the beginning.

And remove the / so now is reads "href="webcam/snap.jpg"

So what I’m I missing?

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/6bd6d023-6863-4d3e-8cdb-24876cd22f58n%40googlegroups.com.

Karen K

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Oct 11, 2023, 8:47:06 AM10/11/23

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Could you show your template file?

Lorin Tremblay

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Oct 11, 2023, 10:02:38 AM10/11/23

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<style>

text {

font-family: Roboto, sans-serif;

font-weight: 300;

line-height: 1.625;

margin: 0;

font-size: 48px;

fill: white;

}

</style>

## webcam image

## readings

<text x="400" y="570" text-anchor="left">Temp:$current.outTemp - Dir:$current.windDir.ordinal_compass - Speed:$current.windSpeed - Bar:$current.barometer - Total Rain:$day.rain.sum - $current.pm2_5_aqi</text>

</svg>

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Karen K

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Oct 11, 2023, 2:55:19 PM10/11/23

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Is the image situated in /var/www/html/.../webcam or in /etc/weewx/skins/Belchertown/webcam? It should be the former.

I did not use sub-directories myself. So I am not sure. You could try href="snap.jpg" instead of href="webcam/snap.jpg".

Lorin Tremblay

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Oct 11, 2023, 4:00:34 PM10/11/23

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The image is situatied in the web folder under webcam, since that previously I had no need to have it elsewhere.

# Where the generated reports should go, relative to WEEWX_ROOT

HTML_ROOT = /var/www/html/weewx

/var/www/html/weewx/webcam/snap.jpg

Now there is a snap.png and snap.svg in that folder now

pi@Weewx-APRS3695:/var/www/html/weewx/webcam $ ls -la

total 536

drwxrwxrwx 2 root root 4096 Oct 11 15:55 .

drwxr-xr-x 15 root root 4096 Oct 11 15:55 ..

-rw-r--r-- 1 pi pi 492892 Oct 11 15:55 snap.jpg

-rw-r--r-- 1 root root 33150 Oct 11 15:55 snap.png

-rw-r--r-- 1 root root 682 Oct 11 15:55 snap.svg

-rwxrwxrwx 1 root root 482 Oct 11 15:55 '#Webcam_FTP.last’

The script is located in /etc/weewx/skins/Belchertown/webcam/snap.svg.tmpl

I’ve also tried with a copy of my image in the folder of the script (/etc/weewx/skins/Belchertown/webcam/snap.jpg) and nothing change.

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/53500b69-c8e1-48d0-aa3e-d7a535dbabcdn%40googlegroups.com.

Karen K

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Oct 12, 2023, 4:36:02 AM10/12/23

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I will try it myself with the same subdirectories.

Karen K

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Oct 12, 2023, 9:27:35 AM10/12/23

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If I try that, I see a message in the syslog that says:

Oct 12 15:21:08 XXXX weewx[119729] ERROR user.svg2png: URLError <urlopen error [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/www/html/weewx/belchertown/webcam/webcam.jpg'>

Is there a similar message in your case?

The message provides the directory where to place the original webcam image.

Lorin Tremblay

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Oct 12, 2023, 10:18:59 AM10/12/23

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No and my directory is that one

/var/www/html/weewx/webcam/ and not /var/www/html/weewx/belchertown/webcam/

Here are all the info to reproduce my env…

From the weewx.conf

    # Root directory of the weewx data file hierarchy for this station

    WEEWX_ROOT = /

    # Where the skins reside, relative to WEEWX_ROOT

    SKIN_ROOT = /etc/weewx/skins

    # Where the generated reports should go, relative to WEEWX_ROOT

    HTML_ROOT = /var/www/html/weewx

From the belchertown skin.conf

[Extras]

    [SVGtoPNGGenerator]

        [[file1]]

            # file name without extension (optional)

            file = '/var/www/html/weewx/webcam/snap'

            # image width in pixels (optional)

            #width = replace_me

            # image height in pixels (optional)

            #height = replace_me

 [[ToDate]]

[[[file1]]]

            template = webcam/snap.svg.tmpl

[Generators]

    generator_list = weewx.cheetahgenerator.CheetahGenerator, weewx.reportengine.CopyGenerator, user.belchertown.HighchartsJsonGenerator, user.svg2png.SVGtoPNGGenerator

/etc/weewx/skins/Belchertown/webcam/snap.svg.tmpl

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<style>

text {

font-family: Roboto, sans-serif;

font-weight: 300;

line-height: 1.625;

margin: 0;

font-size: 48px;

fill: white;

}

</style>

## webcam image

## readings

<text x="400" y="570" text-anchor="left">Temp:$current.outTemp - Dir:$current.windDir.ordinal_compass - Speed:$current.windSpeed - Bar:$current.barometer - Total Rain:$day.rain.sum - $current.pm2_5_aqi</text>

</svg>

Here is a snippet of my log

Oct 12 10:15:39 Weewx-APRS3695 weewx[24286] INFO user.svg2png: Created 1 PNG file in 1.52 seconds

Oct 12 10:15:39 Weewx-APRS3695 weewx[24286] INFO weewx.cheetahgenerator: Generated 1 files for report AirLinkReport in 0.03 seconds

Oct 12 10:15:39 Weewx-APRS3695 weewx[24286] INFO weewx.imagegenerator: Generated 2 images for report AirLinkReport in 0.23 seconds

Oct 12 10:15:42 Weewx-APRS3695 weewx[24286] INFO weewx.cheetahgenerator: Generated 13 files for report Belchertown in 2.76 seconds

Oct 12 10:15:42 Weewx-APRS3695 weewx[24286] INFO weewx.reportengine: Copied 3 files to /var/www/html/weewx/belchertown

Oct 12 10:15:46 Weewx-APRS3695 weewx[24286] INFO user.svg2png: Created 1 PNG file in 1.53 seconds

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/a94442f0-afa8-4e0d-af79-0411f2313676n%40googlegroups.com.

Karen K

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Oct 12, 2023, 12:21:58 PM10/12/23

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Actually I do not see the glue in that.

What says ls -l /webcam ?
you have log_failure = True ?
set debug = 1 in weewx.conf, restart WeeWX and look at the log again. There should be a message containing the file names and paths of the files read and created.
I assume that you looked at snap.jpg and checked that it is a valid picture.

Lorin Tremblay

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Oct 12, 2023, 1:06:17 PM10/12/23

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What says ls -l /webcam ?

pi@Weewx-APRS3695:/ $ ls -l

total 68

lrwxrwxrwx 1 root root 7 May 2 20:04 bin -> usr/bin

drwxr-xr-x 4 root root 4096 Dec 31 1969 boot

drwxr-xr-x 16 root root 3840 Oct 7 21:27 dev

drwxr-xr-x 124 root root 12288 Sep 27 19:53 etc

drwxr-xr-x 3 root root 4096 May 2 20:37 home

lrwxrwxrwx 1 root root 7 May 2 20:04 lib -> usr/lib

drwx------ 2 root root 16384 May 2 20:34 lost+found

drwxr-xr-x 2 root root 4096 May 2 20:04 media

drwxr-xr-x 2 root root 4096 May 2 20:04 mnt

drwxr-xr-x 4 root root 4096 May 2 20:14 opt

dr-xr-xr-x 235 root root 0 Dec 31 1969 proc

drwx------ 5 root root 4096 Sep 5 22:13 root

drwxr-xr-x 29 root root 880 Oct 12 12:58 run

lrwxrwxrwx 1 root root 8 May 2 20:04 sbin -> usr/sbin

drwxr-xr-x 2 root root 4096 May 2 20:04 srv

dr-xr-xr-x 12 root root 0 Dec 31 1969 sys

drwxrwxrwt 18 root root 4096 Oct 12 12:59 tmp

drwxr-xr-x 11 root root 4096 May 2 20:04 usr

drwxr-xr-x 12 root root 4096 Sep 5 22:25 var

pi@Weewx-APRS3695:/ $

you have log_failure = True ?

Yes always

set debug = 1 in weewx.conf, restart WeeWX and look at the log again. There should be a message containing the file names and paths of the files read and created

Now just did and here are the results

Oct 12 13:02:35 Weewx-APRS3695 wee_reports[29176] DEBUG user.svg2png: /var/www/html/weewx/webcam/snap.svg --> /var/www/html/weewx/webcam/snap.png

Oct 12 13:02:35 Weewx-APRS3695 wee_reports[29176] INFO user.svg2png: Created 1 PNG file in 1.60 seconds

Oct 12 13:02:43 Weewx-APRS3695 wee_reports[29176] DEBUG user.svg2png: /var/www/html/weewx/webcam/snap.svg --> /var/www/html/weewx/webcam/snap.png

Oct 12 13:02:43 Weewx-APRS3695 wee_reports[29176] INFO user.svg2png: Created 1 PNG file in 1.52 seconds

Yes that picture is in use already for my Web pages.

http:///www.gestionlgt.com/Maison/

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Karen K

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Oct 12, 2023, 1:30:58 PM10/12/23

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Please, enter ls -l /webcam , not just ls -l

Karen K

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Oct 13, 2023, 5:25:26 AM10/13/23

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As there is no reply I would like to add something.

In this case href="/webcam/snap.jpg" refers to a non-existing file. This is because of the slash at the beginning.

I do not know the real location of snap.jpg. So I cannot provide the correct href line.

I added a troubleshooting section in README.

Lorin Tremblay

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Oct 13, 2023, 10:44:34 AM10/13/23

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Hi!

The path of where the pictures is:

/var/www/html/weewx/webcam/snap.jpg

pi@Weewx-APRS3695:/ $ ls -l /webcam

ls: cannot access '/webcam': No such file or directory

pi@Weewx-APRS3695:/ $

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Karen K

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Oct 13, 2023, 10:47:56 AM10/13/23

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The result is as I expected. If you reference a file that does not exist, it cannot work.

Try href="/var/www/html/weewx/webcam/snap.jpg" in your template.

Lorin Tremblay

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Oct 13, 2023, 2:17:48 PM10/13/23

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I have tried that and it didn't work, but will try it again and kept you posted!

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/c055358f-1efb-4a35-8e54-ae674a0497b8n%40googlegroups.com.

Lorin Tremblay

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Oct 13, 2023, 2:43:42 PM10/13/23

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Nothing as changed in my case, still not getting the image, only the text…..

Oct 13 14:20:36 Weewx-APRS3695 weewx[3256] INFO user.svg2png: Created 1 PNG file in 1.60 seconds

Oct 13 14:20:43 Weewx-APRS3695 weewx[3256] INFO user.svg2png: Created 1 PNG file in 1.52 seconds

Oct 13 14:25:31 Weewx-APRS3695 weewx[3256] INFO user.svg2png: Created 1 PNG file in 1.54 seconds

Oct 13 14:25:38 Weewx-APRS3695 weewx[3256] INFO user.svg2png: Created 1 PNG file in 1.51 seconds

Oct 13 14:30:37 Weewx-APRS3695 weewx[3256] INFO user.svg2png: Created 1 PNG file in 1.52 seconds

Oct 13 14:30:45 Weewx-APRS3695 weewx[3256] INFO user.svg2png: Created 1 PNG file in 1.55 seconds

Once again here are my conf….

Content and location /etc/weewx/skins/Belchertown/webcam/snap.svg.tmpl

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<style>

text {

font-family: Roboto, sans-serif;

font-weight: 300;

line-height: 1.625;

margin: 0;

font-size: 48px;

fill: white;

}

</style>

## webcam image

## readings

<text x="400" y="570" text-anchor="left">Temp:$current.outTemp - Dir:$current.windDir.ordinal_compass - Speed:$current.windSpeed - Bar:$current.barometer - Total Rain:$day.rain.sum - $current.pm2_5_aqi</text>

</svg>

Content and location of my Belchertwon skin.conf

[[ToDate]]

# Reports that show statistics "to date", such as day-to-date,

# week-to-date, month-to-date, etc.

[[[weewx_data]]]

template = json/weewx_data.json.tmpl

[[[Belchertown]]]

template = js/belchertown.js.tmpl

[[[home]]]

template = index.html.tmpl

[[[about]]]

template = about/index.html.tmpl

[[[graphs]]]

template = graphs/index.html.tmpl

[[[records]]]

template = records/index.html.tmpl

[[[reports]]]

template = reports/index.html.tmpl

[[[pi]]]

template = pi/index.html.tmpl

[[[kiosk]]]

template = kiosk.html.tmpl

[[[manifest]]]

encoding = utf8

template = manifest.json.tmpl

[[[file1]]]

template = webcam/snap.svg.tmpl

###############################################################################

[CopyGenerator]

# This section is used by the generator CopyGenerator

# List of files to be copied only the first time the generator runs

copy_once = favicon.ico, images/*, json/index.html, js/index.html, js/responsive-menu.js, robots.txt

# List of files to be copied each time the generator runs

copy_always = *.css

###############################################################################

#

# The list of generators that are to be run:

#

[Generators]

generator_list = weewx.cheetahgenerator.CheetahGenerator, weewx.reportengine.CopyGenerator, user.belchertown.HighchartsJsonGenerator, user.svg2png.SVGtoPNGGenerator

[SVGtoPNGGenerator]

[[file1]]

# file name without extension (optional)

file = /var/www/html/weewx/webcam/snap

# image width in pixels (optional)

#width = replace_me

# image height in pixels (optional)

#height = replace_me

Location of my webcam Image

/var/www/html/weewx/webcam/

And also included the jpg and png.

snap.svg

snap.png

snap.jpeg

Karen K

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Oct 13, 2023, 3:31:34 PM10/13/23

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According to what you posted, the file is called snap.jpeg (including character e) and not snap.jpg (without character e).

Lorin Tremblay

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Oct 13, 2023, 3:44:13 PM10/13/23

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NO the email software changed it

pi@Weewx-APRS3695:~ $ ls -la /var/www/html/weewx/webcam/

total 544

drwxrwxrwx 2 root root 4096 Oct 13 15:40 .

drwxr-xr-x 15 root root 4096 Oct 13 15:40 ..

-rw-r--r-- 1 pi pi 500914 Oct 13 15:40 snap.jpg

-rw-r--r-- 1 root root 34386 Oct 13 15:40 snap.png

-rw-r--r-- 1 root root 694 Oct 13 15:40 snap.svg

-rwxrwxrwx 1 root root 482 Oct 13 15:40 '#Webcam_FTP.last'

pi@Weewx-APRS3695:~ $

<snap.svg>
<snap.png>
<snap.jpeg>

Karen K

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Oct 15, 2023, 5:27:27 AM10/15/23

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If I try your files at my location, they work.

The next thing I would check is the CairoSVG installation.

Lorin Tremblay

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Oct 15, 2023, 10:06:18 AM10/15/23

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You want to provide your settings?

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/4eeadb23-976e-4b11-8933-742141600768n%40googlegroups.com.

jiaqi Yan

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Oct 15, 2023, 10:14:17 AM10/15/23

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、

顏嘉琪

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/AB2C18E2-00FB-4249-9B45-83E6441599F7%40gmail.com.

Karen K

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Oct 15, 2023, 10:28:54 AM10/15/23

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Lorin Tremblay schrieb am Sonntag, 15. Oktober 2023 um 16:06:18 UTC+2:

You want to provide your settings?

I did not set anything. I installed CairoSVG, and that is it.

Joachim Puttkammer

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Oct 18, 2023, 8:02:13 AM10/18/23

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I also have the problem that the webcam image (snap.jpg) is not made into a common image (snap.png) with the generated weather data image (snap.svg).
snap.png is identical with snap.svg
In snap.svg.tmpl I tried all variations of href="webcam/snap.jpg" and also copied the image file snap.jpg into all Weewx folders and subfolders to get a correct href.

Local test PC: Debian Bookworm, Weewx 4.10.2

Dale Chatham

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Oct 18, 2023, 8:07:32 AM10/18/23

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I'm not particularly familiar with that corner of weewx, but since you said you also copied the image, the package ImageMagick will convert image types, sizes, etc. You can find it here: https://imagemagick.org/index.php

It's available for most Linux distros via the resident package manager (apt, dnf, yum, ...) Windows, etc.

If this is off-base, my apologies.

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Karen K

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Oct 18, 2023, 8:09:30 AM10/18/23

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CairoSVG is said to produce the better quality compared to ImageMagick.

Gmail

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Oct 18, 2023, 9:27:53 AM10/18/23

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Me too, that’s why I built my own very limited extension to add some weewx variable to a jpg with pillow…

On Oct 18, 2023, at 08:02, Joachim Puttkammer <jputt...@gmail.com> wrote:

I also have the problem that the webcam image (snap.jpg) is not made into a common image (snap.png) with the generated weather data image (snap.svg).

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Joachim Puttkammer

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Oct 18, 2023, 2:35:02 PM10/18/23

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with the Linux console command composite -blend 10 snap.jpg snap.png result.jpg it works, but I would like to do it already with the template snap.svg.tmpl.

Dale Chatham schrieb am Mittwoch, 18. Oktober 2023 um 14:07:32 UTC+2:

Greg from Oz

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Oct 18, 2023, 5:57:01 PM10/18/23

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I just use imagemagick and a $5 esp32 webcam and it is ok for what I am doing.

I may look at CairoSVG later though and see what it can do.

https://weather.ubeaut.work/webcam.html

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