Font Size

[tomaculum]

Hi all,
I am using the Adafruit GFX part of this library. As the documentation or some example states, menu.init(); sets the font size to 1. Unfortunately this is very small on my display. Is there any way to increase the font size?
Best regards
Tom

[Spirik]

Hi Tom!

Unfortunately, currently there is no easy way to change font scaling w/o editing source code of GEM. I really should add this feature in future updates (although there is one caveat that I have to figure something out about, see below). That being said, here is small rundown of the changes in source code that can be made to scale font size 2x times:

• Change font dimensions here (multiply each dimension by 2, except for the last one in each triplet: it can be multiplied by 2 with additional adjustments for better vertical alignment): https://github.com/Spirik/GEM/blob/master/src/GEM_adafruit_gfx.h#L153 ;
• Change call to _agfx.setTextSize(2) here: https://github.com/Spirik/GEM/blob/master/src/GEM_adafruit_gfx.cpp#L153 and here: https://github.com/Spirik/GEM/blob/master/src/GEM_adafruit_gfx.cpp#L191 ;
• Change offset calculations here (multiply each number by 4): https://github.com/Spirik/GEM/blob/master/src/GEM_adafruit_gfx.cpp#L251 ;
• Change call to _agfx.drawChar() (replace 1 with 2) here: https://github.com/Spirik/GEM/blob/master/src/GEM_adafruit_gfx.cpp#L709 .

And in your sketch set menuItemHeight appropriately to accommodate enlarged text (e.g. GEM_adafruit_gfx menu(tft, GEM_POINTER_ROW, GEM_ITEMS_COUNT_AUTO, 24, 24);).

The limitation of this approach is that it does nothing to enlarge sprites (i.e. pictograms that are used to draw arrows and checkboxes), so the icons will look rather small compared to text. And that is the caveat that I was referring to earlier. I am a little hesitate to add new set of sprites with 2x dimensions risking to further bloat the library size. So I will have to figure something out=)

Here are gists with all necessary edits, you can replace existing GEM_adafruit_gfx.h and GEM_adafruit_gfx.cpp files bundled with the GEM library with the following ones:

• GEM_adafruit_gfx.h
• GEM_adafruit_gfx.cpp

And to wrap this up, here are some photos.

Before scaling:

After scaling:

Hope that will help=)

[tomaculum]

Thank you very much! This worked great (:

Previous size:

After scaling:

[Spirik]

Glad to help! I will add this feature to release version of GEM eventually=)

[Spirik]

Hi, @tomaculum !

Not sure if still relevant, but just want to let you know that setting text size for Adafruit GFX version of GEM is now available through menu.setTextSize() method since version 1.4.2, see wiki for additional details.

Have a good day!

[tomaculum]

Great, thank you very much! Will try it in the upcoming days (: