I want to thank all those who have been helping me the past few days, I couldn't have gotten this far without your advice. I feel like I am abusing this discussion board a bit but I've been struggling with this concept for a while now and although its a bigger question I thought I could at least put it out there.
I am trying to create a health bar for my Boss actor. The Boss appears after you collect a certain number of objects, so the bar would need to appear at the same time. I watched some youtube videos and managed to get the bar at the top of the screen when the boss appears, but the bar doesn't decrease when you shoot the Boss. I don't know what I'm missing.
Here is my code for the Boss Health bar so far:
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
public class BossHealth extends Actor
{
int health = 4;
int healthBarWidth = 80;
int healthBarHeight = 15;
int pixelsPerHealthPoint = (int)healthBarWidth/health;
/**
* Act - do whatever the BossHealth wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public BossHealth()
{
updateHealth();
}
public void act()
{
updateHealth();
}
public void updateHealth()
{
setImage(new GreenfootImage(healthBarWidth+2, healthBarHeight+2));
GreenfootImage myImage = getImage();
myImage.setColor(Color.WHITE);
myImage.drawRect(0, 0, healthBarWidth+1, healthBarHeight + 1);
myImage.setColor(Color.RED);
myImage.fillRect(1,1, health*pixelsPerHealthPoint, healthBarHeight);
}
public void loseHealth()
{
health--;
}
}
Per the video I watched, I inserted the following into my space world:
BossHealth bosshealth = new BossHealth(); //At the top above the constructor
public BossHealth getBossHealth() //This method I placed after the constructor.
{
return bosshealth;
}
In my Hero's class I have a method that adds the boss when the hero collects X number of objects, so I added the health bar here too:
public void addBoss()
{
getWorld().removeObjects(getWorld().getObjects(Spacedog.class));
getWorld().removeObjects(getWorld().getObjects(Yarnball.class));
getWorld().addObject(new Boss(), 300, 300);
getWorld().addObject(new BossHealth(), 322, 46);
}
Finally, in the Boss class I added a boolean at the top "boolean touchingLaser = false;" and I have hitBoss method which is called in the Laser class:
public void hitBoss()
{
Space space = (Space) getWorld();
BossHealth bosshealth = space.getBossHealth();
if(touchingLaser == false)
{
bosshealth.loseHealth();
bosshealth.updateHealth();
touchingLaser = true;
if (bosshealth.health <=0)
{
Greenfoot.playSound("Explosion.wav");
space.addObject(new Explosion(), getX(), getY());
Greenfoot.playSound("hooray.wav");
space.removeObjects(space.getObjects(Counter.class));
space.removeObject(this);
space.addObject(new Congratulations(), space.getWidth()/2, space.getHeight()/2);
}
}
else{
touchingLaser = false;
}
}
Everything compiles without error, but it doesn't work. The health bar doesn't decrease when you shoot the Boss. Any help or advice would be appreciated. Thank you!
