AdafruitGFX fontconvert

The Adafruit library has a nice utility to add new fonts. To use this utility, you need to get the code from github:

git clone git@github.com:adafruit/Adafruit-GFX-Library.git

You need to install the freetype library, for example using homebrew

brew install freetype

You might have to change the makefile to point to the right place for the library (change accordingly):

CFLAGS = -Wall -I/usr/local/include/freetype2 -I/usr/include/freetype2 -I/usr/include -I/opt/homebrew/Cellar/freetype/2.13.3/include/freetype2
LIBS = /opt/homebrew/Cellar/freetype/2.13.3/lib/libfreetype.dylib

Go to the fontconvert folder and compile:

make

Make sure the fontconvert executable and the truetype file are in the same folder and execute:

fontconvert myfont.ttf 12 > myfont12pt7b.h

This wil give the font array for size 12. You may also add an ASCII range to minimize the number of characters in the array, for example to convert only numbers:

fontconvert myfont.ttf 12 48 57 > myfont12pt0-9.h

The following table gives all the instructions for the fonts we will use (7b means ASCII characters from 32 to 127):

Font size	Characters	Instruction
14	0-9 :	./fontconvert FreeSans.ttf 12 48 58 > FreeSans14pt0-9.h
14 Bold	A-Z	./fontconvert FreeSansBold.ttf 14 65 90 > FreeSansBold14ptA-Z.h
16	7b	./fontconvert FreeSans.ttf 16 > FreeSans16pt7b.h
20	7b	./fontconvert FreeSans.ttf 20 > FreeSans20pt7b.h
24	7b	./fontconvert FreeSans.ttf 24 > FreeSans24pt7b.h
30	7b	./fontconvert FreeSans.ttf 30 > FreeSans30pt7b.h
30 bold	0-9 :	./fontconvert FreeSansBold.ttf 30 48 58 > FreeSansBold30pt0-9.h
80	0-9	./fontconvert FreeSans.ttf 80 48 57 > FreeSans80pt0-9.h

The weather icons are created from their SVG using the icomoon.io online converter. The characters are from A (sunny) to O (night cloudy). Three font sizes are used:

Font size	Instruction
48	./fontconvert WeatherIcons.ttf 48 65 79 > WeatherIcons48pt.h
64	./fontconvert WeatherIcons.ttf 64 65 79 > WeatherIcons64pt.h
80	./fontconvert WeatherIcons.ttf 80 65 79 > WeatherIcons80pt.h