2021-12-12 (Su) EWC_Panel LED panel rotation calculation

In my haste to install the LED panels, I mounted them the way they fit best. I didn't account for their rotation. The logical way to align the addressable LEDs would be with "0" in the upper left corner, and the rest of the numbers would flow like words in a (western) book. Unfortunately, as I proved yesterday, the lights started in the bottom left and came up. I thought I might need an elaborate look-up table to manage their location, but I spent some time with scratch paper and worked out the equation to convert X-Y coordinates into an address.
Calculation sketches

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8

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