General
Look at Writeable Variables' Home first.
These variable say to the library how things should be drawn.
globalColor [Color]
It holds the color that is going to be used for all shapes and for creating objects when some arguments aren't specified.
Recommended to also look at ComputerCraft's Colors API.
globalTextColor [Color]
It holds the color that is going to be used for all texts.
Recommended to also look at ComputerCraft's Colors API.
globalBackgroundTextColor [Color]
It holds the color that is going to be used for all texts' backgrounds.
Recommended to also look at ComputerCraft's Colors API.
globalRectangleType [RectangleType]
It holds the type of rectangle that should be drawn.
Recommended to also look at APLib's rectangleTypes.