B4J Question B4J non-ui app and bitmaps

[GraemeW]

I have a VPS-hosted B4J non-ui server app connected to a MySQL database and wish to create a series of xChart images from the db for use with 24/7 YouTube live (via FFmpeg).

However I have found that the B4J non-ui app cannot produce bitmaps from xChart snapshots. Am I missing something? If true, is another approach possible, such as B4J -> Python -> FFmpeg?

 

[aeric]

Have you checked this tutorial?

[server] Using UI app to create a QR code as part of a server solution

Online example: https://b4x.com:51041/qrgenerator/index.html A question was posted about generation of QR codes in a server solution (https://www.b4x.com/android/forum/threads/solved-jserver-html-js.123679/). I thought that I can quickly create a nice and simple...

www.b4x.com

 

[GraemeW]

Have you checked this tutorial?

[server] Using UI app to create a QR code as part of a server solution

Online example: https://b4x.com:51041/qrgenerator/index.html A question was posted about generation of QR codes in a server solution (https://www.b4x.com/android/forum/threads/solved-jserver-html-js.123679/). I thought that I can quickly create a nice and simple...

www.b4x.com

Thanks for that. I'll check it out.

However my observation about non-ui and bitmaps may not be correct - things seem to be ok if I change bitmap to B4XBitmap.

 

[aeric]

I am not familiar with FFMpeg but I think it is working with jShell.

 

[aeric]

Maybe you can use these libraries too:

non-ui - resize image in byte array without javafx

I get a image as byte on my server, i want to create a smaller image of it to use it as thumbnail. I want to avoid having to use javafx. Is that possible?

www.b4x.com

[Source code] ImageScaler

Introduction: I don't know if there is any library exist to resize image in B4J non-UI app. I thought such library will be useful to process images for web server in building REST API for e-commerce or e-learning web apps. I found an example on web and chose the third method, from an old project...

www.b4x.com

 

[GraemeW]

I am not familiar with FFMpeg but I think it is working with jShell.

Yes the tutorial uses jShell to get a ui app on the server to produce the graphic, using text output from the non-ui app. I suspect this might get very complicated for the production of chart images, which is why I was thinking of using the non-ui server to output text arrays as input to python for graph image production.

I'll also check out your other suggestions in case plan A does not actually work - thank you .

 

[Erel]

Check this: https://www.b4x.com/android/forum/threads/pybridge-server-online-charts-with-plotly.167983/#content

 

[aeric]

You can also use Chart.js

EndsMeet ChartJs HTMX

Update Chart.js using HTMX and B4J GitHub: https://github.com/pyhoon/EndsMeet-Htmx-ChartJs-B4J Code modified from DeepSeek's answer.

www.b4x.com

 

[GraemeW]

Check this: https://www.b4x.com/android/forum/threads/pybridge-server-online-charts-with-plotly.167983/#content

Thank you. I now realize plan A won't work as xCharts require a view object host.

I was afraid the answer lay in the Python direction.. I'll need a long run-up for the Plotly learning curve..

 

[GraemeW]

You can also use Chart.js

EndsMeet ChartJs HTMX

Update Chart.js using HTMX and B4J GitHub: https://github.com/pyhoon/EndsMeet-Htmx-ChartJs-B4J Code modified from DeepSeek's answer.

www.b4x.com

Thanks again . A dynamic graphic website with data from my B4J server is another approach - essentially a real-time web dashboard. Interesting, I'll think a bit more about what I'm trying to solve..