World(int worldWidth, int worldHeight, int cellSize, boolean bounded). The act method is called by the greenfoot framework to give actors a chance to. Get all the objects in the world, or all the objects of a particular class.

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If more than one object of the specified class resides at that location, one of them will be chosen and returned. Return the world’s background image. The y-coordinate of the actor’s current location Throws: An Actor is not normally instantiated, but instead used as pai superclass to more specific objects in the world.

The method here is empty, and subclasses normally provide their own implementations.

The list will include this object, if the offset is zero. The object will have a default image. The second edition of the book is out now. If grsenfoot sound is currently paused it will now be stopped instead.

Actor (Greenfoot API)

Set the rotation of this actor. IllegalStateException – If the actor has not been added into a world.

This method is called by the Greenfoot system when the execution has stopped. List of objects of the given class type that intersect with the current object. True if the mouse has been pressed changed from a non-pressed state to being pressed on the given object.

The act method is called by the greenfoot framework at each action step in greenfooy environment. Return all objects that intersect the center of the given location relative to this object’s location. This method can be vreenfoot to implement custom behaviour when the execution ggreenfoot stopped.


Act order is specified by class: The sound cannot be played several times simultaneously, but can be played several times sequentially. Simple scenarios may use large cells that entirely contain the representations of objects in a single cell. You can also access it from within Greenfoot – use the “Greenfoot Class Documentation” menu item, from the Help menu. New Kinect with Greenfoot.

The Greenfoot FAQ list covers many frequently-asked questions. Running Greenfoot projects on Netbeans.

If the sound is played again later, it will start playing from the beginning. Removes one object of the given class that this actor is currently touching if any exist. This moves the actor to the specified location. The default implementation does nothing. Objects of classes listed first in the parameter list will act before any objects of classes listed later.

More elaborate scenarios may use smaller cells down to single pixel size to achieve fine-grained placement and smoother animation. All cells that can be reached in the number of steps given in ‘distance’ from this object are considered. This takes the graphical extent of objects into consideration. If the sound is currently paused, it will resume playback from the point where it was paused.

If this method is overridden it is important to call this method as “super. The location is specified as the coordinates of a cell in the world. Returns the image used to represent this actor.


Package greenfoot

The size of cells can be specified at greenffoot creation time, and is constant after creation. A pattern showing the cells can easily be shown by setting a background image with a size equal to the cell size. Return the current rotation of this actor. This site requires JavaScript, please enable it in your browser!

An object is within range if the distance between its centre and this object’s centre is less than or equal to ‘radius’.

Set the act order of objects in the world. Assign a new location for this actor. True if the object’s intersect, greenfoof otherwise. List of objects at the given offset. Start playing this sound. Every object that is intended to appear in the world must extend Actor.


This default implementation is empty. This method can be overridden to implement custom behaviour when the execution is started. Construct a new world.

If the sound is currently paused, it will resume playing from the point where it was paused. Objects of a class not explicitly specified inherit the act order from their superclass.

Please visit the book’s web page for more information about this freenfoot edition. A list of objects.