Introduction to Programming with Greenfoot: Object–Oriented Programming in Java™ with Games and Simulations, First Edition

Appendix B. Greenfoot API

The Greenfoot API consists of five classes:

Actor	Actor methods are available to all actor subclasses.
World	World methods are available to the world.
Greenfoot	Used to communicate with the Greenfoot environment itself.
MouseInfo	Provides information about the last mouse event.
GreenfootImage	For image presentation and manipulation.

Class World
World(int worldWidth, int worldHeight, int cellSize)	Construct a new world.
void act()	Act method for the world. Called once per act round.
void addObject (Actor object, int x, int y)	Add an Actor to the world.
GreenfootImage getBackground()	Return the world’s background image.
int getCellSize()	Return the size of a cell (in pixels).
Color getColorAt(int x, int y)	Return the color at the center of the ...