I did not find a location to introduce myself so I'll quickly do this here.
I'm an electronics engineer, mostly hardware and a bit of C programming. Recently I got into embedded security and found a job there.
For me I just want to the ESP32 as a tool and I don't feel like learning it for the sake of learning.
Micro python is interesting to me as the chips get more powerful there is no real reason any more to write code in assembly or C.
Early 2020 I purchased an M5stack and a couple of ESP32 and gave a few 'easy' projects a try.
I'd wanted to read out a SPI sensor but found quickly that there is no easy way to do so. In M5stack they removed SPI from the machine library. They've told me it's because the SPI implementation does not support multiple sensors on the bus and it's used for the display.
That project failed quickly and I was discouraged.
A month ago I've bought the same sensor but on I2C instead. It's a 12bit magnetic encoder.
For the project I want to measure angles accurately, that succeeded. Now I want to visualise this data, preferably not as a number.
What i came up with was to have a virtual (safe) dial on the screen. I've generated a picture but quickly found rotating images is not trivial.
Something like this:
Others solve this by using sprites, as many angles as you need.
For me this would be 360 sprites, one for every degree of rotation making it non trivial.
I've seen a very cool implementation where someone draws an old radio interface on an OLED.
It looked like they would just draw an image partially outside of the screen area. But it appears they generate it on the fly.
link: https://tj-lab.org/2019/02/17/vfo5/
So my question comes down to:
Does a micro python game or graphics engine exists that allows me to rotate sprites arbitrarily?
What other ways are there to solve this problem?
Thanks in advance.
