Class Counter

java.lang.Object

greenfoot.Actor

Counter

public class Counter
extends greenfoot.Actor

A Counter class that allows you to display a numerical value on screen. The Counter is an actor, so you will need to create it, and then add it to the world in Greenfoot. If you keep a reference to the Counter then you can adjust its value. Here's an example of a world class that displays a counter with the number of act cycles that have occurred:

 class CountingWorld
 {
     private Counter actCounter;
     
     public CountingWorld()
     {
         super(600, 400, 1);
         actCounter = new Counter("Act Cycles: ");
         addObject(actCounter, 100, 100);
     }
     
     public void act()
     {
         actCounter.setValue(actCounter.getValue() + 1);
     }
 }
 

Version:

1.0

Author:

Neil Brown and Michael Kölling

Constructor Summary

Constructors

Constructor	Description
Counter()
Counter(String prefix)	Create a new counter, initialised to 0.

Method Summary

Modifier and Type	Method	Description
void	act()	Animate the display to count up (or down) to the current target value.
void	add(int score)	Add a new score to the current counter value.
int	getValue()	Return the current counter value.
void	setPrefix(String prefix)	Sets a text prefix that should be displayed before the counter value (e.g.
void	setValue(int newValue)	Set a new counter value.

Methods inherited from class greenfoot.Actor

addedToWorld, getImage, getIntersectingObjects, getNeighbours, getObjectsAtOffset, getObjectsInRange, getOneIntersectingObject, getOneObjectAtOffset, getRotation, getWorld, getWorldOfType, getX, getY, intersects, isAtEdge, isTouching, move, removeTouching, setImage, setImage, setLocation, setRotation, sleepFor, turn, turnTowards

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Counter

public Counter()

Counter

public Counter(String prefix)

Create a new counter, initialised to 0.

Method Details

act

public void act()

Animate the display to count up (or down) to the current target value.

Overrides:

act in class greenfoot.Actor

add

public void add(int score)

Add a new score to the current counter value. This will animate the counter over consecutive frames until it reaches the new value.

getValue

public int getValue()

Return the current counter value.

setValue

public void setValue(int newValue)

Set a new counter value. This will not animate the counter.

setPrefix

public void setPrefix(String prefix)

Sets a text prefix that should be displayed before the counter value (e.g. "Score: ").