What is Adafruit GFX library?

The Adafruit GFX library is a powerful resource for Arduino developers that allows them to add graphics, text, and bitmaps to their projects. It's a core library for many other Adafruit libraries and hardware to provide some basic drawing functions. It is designed to work with different types of hardware and allows users to quickly and easily incorporate graphics into their projects.

Here are the steps to use the Adafruit GFX library:

1. Installation: First, you need to install the Adafruit GFX library. You can do this through the Arduino IDE. Go to Sketch > Include Library > Manage Libraries and search for Adafruit GFX library. Click on it and install it.

2. Include the Library: Once installed, you need to include the library in your sketch. You can do this by adding #include <Adafruit_GFX.h> at the top of your sketch.

3. Create an Instance: Next, you need to create an instance of the Adafruit GFX class. This is typically done in the global scope of your sketch. For example, Adafruit_GFX gfx;

4. Use the Library: Now you can use the various functions provided by the library to draw graphics. For example, gfx.drawRect(10, 10, 50, 50, WHITE); would draw a white rectangle.

5. Update the Display: Finally, you need to update the display to see your graphics. This is typically done with a function specific to your display hardware. For example, if you're using an Adafruit ILI9341 display, you would call tft.display();

Remember, the Adafruit GFX library is a base for working with graphics. You'll often use it in conjunction with a hardware-specific library that handles the details of communicating with your particular display hardware.