To add to what @quark said
- Calling the
.color()method on a PGraphics object should be valid, because PGraphics defines all the drawing methods like.line(),.stroke(),.rect(), and also.color(). - Defining methods called
color(),line(), or any other Processing keyword inside your class does work. Defining a method calleddraw()inside a class is actually common practice (for particles, for instance), although it may confuse less experienced users by making them think they are somehow Processing related. - Defining a method called
float()is not ok, but not because it’s a Processing keyword, but because it’s a Java Keyword.