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I noticed that the TomThumb.h font included in the Adafruit GFX library has characters that have different widths, which is a problem for me because I'm doing text processing that requires characters to have the same dimensions (width and height). I also noticed that the TomThumb.h font misses some characters (such as ') and so on. I need a way to create/edit fonts for the Adafruit GFX (where I'm using the Adafruit_ST7735 on a 1.8" TFT Display). I've looked around the internet but I couldn't find anything decent.

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  • The library comes with a number of fonts. The ones named *Mono* are monospaced, which means that all the characters are the same size.
    – Majenko
    May 2 '20 at 14:18
  • @Majenko Interesting. I thought that by default all characters are required to take equal dimensions. May 2 '20 at 14:21
  • Nope. Each character in the font ("glyph") specifies the dimensions and offset of the character, and also the "advance" - how far to move the cursor after printing the character.
    – Majenko
    May 2 '20 at 14:32
  • @Majenko I'm surprised there isn't an easy way to create fonts for the Adafruit GFX. It's a relatively supported and used library. May 2 '20 at 14:36
  • I have various utilities for DisplayCore, but DisplayCore doesn't run on an Arduino.
    – Majenko
    May 2 '20 at 14:47
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One possible solution you might already have: There’s a small utility called fontconvert that’s part of the Adafruit GFX library. The source code is installed by default together with the Adafruit GFX library in Arduino/libraries/Adafruit_GFX_Library/fontconvert You need Linux to compile it from the provided source code. It also compiles and runs on a Raspberry Pi.

It takes care of converting TrueType fonts (completely or partially) to Adafruit GFX format. There’s some documentation on compiling and using it in the fontconvert directory.

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  • Thanks, I found it. Unfortunately, I don't have a Linux nor a Raspberry Pi. I could install a Linux VM. Isn't there an easier way? Like, some tool where you put the individual pixels for each character. May 2 '20 at 14:33
  • Well, there’s This. I don’t know how useful this is for you, but you could take a look at it.
    – StarCat
    May 2 '20 at 14:36
  • Thanks, I'll take a look. I hope it'll do the job May 2 '20 at 14:47

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