Interested in reading function definition

Hey guys I am working on a project in which I will feed the current co-ordinates of a car and plot its position on a track which is pre decided. For this I wanted to read the function definition of some built in functions in processing IDE, I searched a lot but couldn't find function definitions. Someone please point me to the right direction.

In the location that you installed the IDE (for 1.0.x IDEs, it may be different for 1.5.x):

  • hardware/arduino/cores/arduino/ (basic functions);
  • libraries//* (library functions);
  • hardware/arduino/variants//pins_arduino.h (machine pin definitions).

Replace with the name of the library, and with the machine you are targeting (standard, mega, micro, leonardo, etc.).