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Generate simple image on a standalone Raspberrry Pi

On 27/09/2019 14.43, Roy Hann wrote:
> I am designing a mobile application to run on a Raspberry Pi 3 model B.
> It will not have any Internet access. I need to generate a static image
> consisting of a simple arc representing (say) a speedometer or a
> pressure gauge. The image will need to be regenerated every 5 seconds.
> The image must be displayed in a web browser (served by gunicorn
> running on the Pi). I prefer it to be a PNG but that is only a
> preference.
> Plotly is amazing but big and slow. Pygal looked acceptable but
> Internet access is required to render the SVG. 

There's always matplotlib.

Depending on how simple it needs to be, pillow might do the trick.

> Has anyone any suggestion for a lightweight solution? 
> Roy