Add option to rotate display by 90, -90, 180 for different orientations

[txoof]

This will likely impact the epdlib.Screen class.

• 180 rotations should be trivial as it won't affect much other than adding a line to rotate the final output image
• 90 and -90 rotations will be more complex epdlib.Layout will probably need some work because the width and height are hard-coded as a tuple of (epd.width, epd.height)

[tmmorin]

Indeed, 180 is easily achieved by a little bit of class overloading (my proposed change), while 90/-90 will require interactions with the layout.

For 90/-90 my feeling is that it will be better to try to achieve this by:

• adding an option to rotate a given block in a layout
• adding an option to rotate all blocks in a layout
• then new layouts dedicated to a 90 or -90 orientation can be added, which will use these options

[txoof]

@tmmorin
I'm thinking that it would be best to rotate everything in the layout. This might be as simple as adding a parameter to the screen class that adjust the rotation.

The Block classes don't really care what the dimensions of the screen are, they just need to know the X and Y values.

Are you on Discord/Google/some other platform to chat?

I just discovered Discord: txoof#0376

[txoof]

@tmmorin
Can you test out commit 8a7d5b0 on the development branch? I've got it working for 0, 90, -90 and 180 degree rotations.

There's some proof of concept code attached in the Screen library it should run with python Screen.py

[txoof]

@tmmorin this commit should do the job with the option

I think it's all good, but if you have a moment to test it out and confirm that it runs OK, I'd appreciate it.

[txoof]

the version above is built against the development branch of the epdlib

[txoof]

Should actually be commit 3440b64

[tmmorin]

Are you on Discord/Google/some other platform to chat?
I just discovered Discord: txoof#0376

tm.morin@gmail.com on hangouts will work quite well for me, if you want :)

I'm going to try the rotation code ; I'm lost in your commits to be honest ... but that's no big deal ! ;)

[txoof]

I've implented this and it appears to work as expected.