Can one object tell other objects in a world to do a certain action?
I've seen programs that must use this, but I cant seem to do it.
Any help?
toytttttt wrote ...
2011/12/29
Broadcast?
A simple way to do this is to have a boolean(or integer) defined in your world class and check if it's true from a different object.
This code should print false to the terminal until the actor is added to the world.
public class myWorld extends World
{
public boolean hasToRun = false;
public void act()
{
System.out.println("hasToRun is " + hasToRun);
}
}public class actor extends Actor
{
protected void addedToWorld(World world)
{
// When this is added to the world, assign hasToRun in myWorld to true.
((myWorld) getWorld()).hasToRun = true;
}
}Question; if I wanted this to be if the actor leaves world print true, how would I change it?
In the actor,
In the world class, at the top,
Also in the world
And add this to the world
This works provided there is only 1 actor in the world. You can put this in other actor classes too.
An easy way to do this is to set the Boolean to false in the world when you remove the object(wherever the removeObject occurs)
public void die()
{
((myWorld) getWorld()).hasToRun = false;
getWorld().removeObject(this);
}import java.util.List; import java.util.Iterator;
private void removeActor()
{
List l = getWorld().getObjects(actor.class);
Iterator i = l.iterator();
while(i.hasNext())
{
Actor a = (Actor)i.next();
if(a.instanceof actor)
{
((actor)a).die();
}
}
}
public void act()
{
if(MEETS_PARAMS_TO_REMOVE_ACTOR)
{
removeActor();
}
}
Another way (provided there is only one actor in the world): In the world class: add the second line to line 1 belowThen, use 'myActor' with addObject and removeObject to add and remove the actor to and from the world. Finally, in the world act() method, add this one lineYou will only need to add to the top of the world class:Now, you can check on the value of 'actorNotHere' from just about anywhere.
public boolean actorNotHere = true; public actor myActor = new actor();
actorNotHere = getObjects(actor.class).size() == 0; // keeping the value of 'actorNotHere' current
import java.util.List;
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