Hi all,
I am trying to make my World spawn enemies every 100 act cycles how can I do that?
mole2003 wrote ...
2018/8/9
actors spawning in on a repeating cycle
//in the active world
private int spawnFrequency = 100, spawnTimer = spawnFrequency;
public void act()
{
if (--spawnTimer == 0)
{
spawnTimer = spawnFrequency;
addObject(new Enemy(), 50, 50);
}
}
Show your world class code.
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class MyWorld here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Background extends World
{
public static final int WIDE = 1182;
public static final int HIGH = 432;
private Scroller scroller;
private int spawnFrequency = 100, spawnTimer = spawnFrequency;
private int enemyClass = Greenfoot.getRandomNumber(5);
public Background()
{
super(WIDE,HIGH,1,false);
GreenfootImage image = new GreenfootImage("Background.png");
scroller = new Scroller(this,image);
prepare();
}
public void act()
{
scroll();
}
private void scroll()
{
int speed = 2;
scroller.scroll(speed, 0);
}
/**
* Prepare the world for the start of the program.
* That is: create the initial objects and add them to the world.
*/
private void prepare()
{
Trex trex = new Trex();
addObject(trex,165,292);
trex.setLocation(140,302);
trex.setLocation(138,294);
trex.setLocation(107,69);
if (--spawnTimer == 0)
{
spawnTimer = spawnFrequency;
if (enemyClass == 1)
{
addObject(new threeShort(), 1077, 325);
}
else if (enemyClass == 2)
{
addObject(new bird(), 1077, 325);
}
}
}
}
The code has to be in the act method, not in the prepare method.
once it has spawned in a new actor it only spawns a new actor. I would like that to change that so it spawns a random actor.
Code I am using currently:
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class MyWorld here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Background extends World
{
public static final int WIDE = 1182;
public static final int HIGH = 432;
private Scroller scroller;
private int spawnFrequency = 100, spawnTimer = spawnFrequency;
private int enemyClass = Greenfoot.getRandomNumber(5);
private int birdHeight = Greenfoot.getRandomNumber(3);
public Background()
{
super(WIDE,HIGH,1,false);
GreenfootImage image = new GreenfootImage("Background.png");
scroller = new Scroller(this,image);
prepare();
}
public void act()
{
scroll();
if (--spawnTimer == 0)
{
spawnTimer = spawnFrequency;
if (enemyClass == 1)
{
addObject(new threeShort(), 1077, 325);
}
else if (enemyClass == 2)
{
if (birdHeight == 1)
{
addObject(new bird(), 1077, 134);
}
else if (birdHeight == 2)
{
addObject(new bird(), 1077, 213);
}
else if (birdHeight == 3)
{
addObject(new bird(), 1077, 292);
}
}
else if (enemyClass == 3)
{
addObject(new one(), 1077, 309);
}
else if (enemyClass == 4)
{
addObject(new threeTall(), 1077, 313);
}
else if (enemyClass == 5)
{
addObject(new two(), 10777, 310);
}
}
}
private void scroll()
{
int speed = 2;
scroller.scroll(speed, 0);
}
/**
* Prepare the world for the start of the program.
* That is: create the initial objects and add them to the world.
*/
private void prepare()
{
Trex trex = new Trex();
addObject(trex,165,292);
trex.setLocation(140,302);
trex.setLocation(138,294);
trex.setLocation(107,69);
}
}
The code in lines 17 and 18 are executed once, so it is one random number which will be used the whole game. Instead, you need to get the random number in the method, so it is a new number every time it is needed.
Move both lines (remove the "private" in the beginning) to between line 34 and 35.
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