Hi, I was wondering how you can make greenfoot create a new object when there are less than a certain number of them. For example, if there are less than 10 worms I want to spawn a new worm. All help is appreciated, thanks.
Dillybar wrote ...
2013/9/19
Help with a command please.
Do this in a subclass of World:
// at the top:
import java.util.List;
// where you want to create the new object:
List worms = getObjects(Worm.class);
if (worms.size() < 10) {
// add a new worm.
}Hi, I tried that but it still wouldn't work. Here is my code. When I compile it says that there are no errors.
import greenfoot.*; // (Actor, World, Greenfoot, GreenfootImage)
import java.util.List;
public class CrabWorld extends World
{
/**
* Create the crab world (the beach). Our world has a size
* of 560x560 cells, where every cell is just 1 pixel.
*/
public CrabWorld()
{
super(560, 560, 1);
addObject (new Crab(), 280, 280);
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
spawnWorms();
}
public void spawnWorms()
{
List worms = getObjects(Worm.class);
if (worms.size() < 10)
{
addObject (new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber (560));
}
}
}
That's because you only do it once: in your constructor of your world. You have to put it in your act method, which gets executed every so-often (usually about 60 times per second).
public void act()
{
spawnWorms();
}
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