Rotating a font by 90 before displaying it

[umanayana]

What is the best method to rotate a font by 90degress before displaying it.
I need to print text along he height of the screen instead of the width but I am having trouble adding a rotating algorithm.
The best solution I can think of so far is to rotate 1 pixel at a time but that very slow and it also doesn't work very well.
I have tired using "GLCD Font Creator" by rotation is not possible.

Thanks

[lexus2k]

Hello,
So, you would like to print text vertically and rotate each char by 90 degrees, wouldn't you?
I can improve glcd_to_ssd1306.py script to allow generate fonts with rotated chars. It seems that this is the easiest way to do, what you want.
Another ideas is to add new API to the library to do that for regular fonts (this is more complicated and requires more uC resources).

[umanayana]

I ended up just going with my original solution.

Take the font data and knowing the height and width per char in pixel, I then do a nested loop and print each pixel. The algorithm order is poor because it's a nested loop, but this doesn't need to run very often and it only require to do it for a max of 8 chars.

[FrogManBird]

It would be great if there was a 'rotate text' method, something like in the Adafruit SSD1351 library.

[lexus2k]

Hi,
I will check what can be done here. Unlike Adafruit SSD1351 library, ssd1306 library supports different displays, and such support requires specific order of calling SPI/I2C functions. Implementing rotation feature requires more complicated implementation. But I think that implementing of this feature is still possible.
Are you talking about direct draw API or NanoCanvas API. Which one is more preferred?

[lexus2k]

You can try the branch https://github.com/lexus2k/ssd1306/tree/1.7.9_rotation. Let me know if this solution is suitable for you.

[RoboDurden]

https://github.com/lexus2k/ssd1306/blob/master/tools/glcd_to_ssd1306.py yields a 404 not found.
https://www.mikroe.com/glcd-font-creator can create 48px high fonts ?
Am not eager to run .exe files.. http://oleddisplay.squix.ch can not make compatible fonts ?
Ideas welcome :-)

[lexus2k]

That script is completely replaced by the new one fontgenerator.py. Of course, glcd font creator is capable of creating fonts 48px high, but it capabilities are rather limited, and it runs only on Windows (I have it under Wine in Linux).
To have a cross-platform tool, I switched to python scripts and freetype python library. As for squix site, it creates font in the format, not supported yet by ssd1306 library. I tried to add support for squix fonts to use them as is, but that requires too much mcu resources.