Where's the fonts in Adafruit_SSD1306/Adafruit_GFX

[wa7iut]

I am messing around with the 128x64 1.3" OLED and successfully have put my own bitmaps into Adafruit_SSD1306.cpp but now am looking for where the fonts used by the display.println() and other methods are stored and defined. I've looked through all the library files (in the directories Adafruit_SSD1306 and Adafruit_GFX) but not finding it (or missing it for some reason. Where should I be looking?

Thanks!

Bob

[jersagfast]

Hello, I'm pretty sure its the glcdfont.c file in the Adafruit_GFX folder. It is a standard ascii 5 X 7 font.

[wa7iut]

Thanks, I don't know how I missed that! I was focused on the Adafruit_GFX.cpp file but totally missed the include, even though I was looking for it. Now need to find where the display.println() function is defined.

Thanks again!

[adafruit_support_rick]

Adafruit_GFX subclasses Print. Print::print calls Print::write(), which is a virtual function. Adafruit_GFX implements the virtual function as Adafruit_GFX::write. Adafruit_GFX::drawChar is called from there. To complete the picture, Adafruit_GFX::drawChar() calls virtual function Adafruit_GFX::drawPixel to actually render the character on the screen. The virtual function drawPixel is implemented as Adafruit_SSD1306::drawPixel()

If that makes your head hurt as much as it makes mine hurt, feel free to forget about the details and just know that print() winds up back at Adafruit_GFX::drawPixel. Adafruit_GFX::drawPixel accesses the font data structure, and renders the characters pixel-by-pixel with calls to Adafruit_SSD1306::drawPixel()