I just published my source code
I do not understand the Java Lang Runtime JavaScript error
Thank you for your help
ronald wrote ...
2021/6/22
STAR WARS
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Smiley here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Tie extends Actor
{
private static final int SPEED = 2;
private int deltaX;
private int deltaY;
private DeathStar home;
public Tie(DeathStar home)
{
deltaX = 0;
deltaY = 0;
}
public void act()
{
hitFire();
randomFly();
}
public void hitFire()
{
Actor laser = getOneIntersectingObject(Laser.class);
if (laser != null)
{
getWorld().removeObject(this);
}
else if (isAtEdge() != false)
{
getWorld().removeObject(this);
}
}
public void randomFly()
{
if (randomChance(50))
{
deltaX = adjustSpeed(deltaX);
deltaY = adjustSpeed(deltaY);
}
fly();
}
public void fly()
{
setLocation(getY() + deltaX, getY() + deltaY);
}
private int adjustSpeed(int speed)
{
speed = speed + Greenfoot.getRandomNumber(2*SPEED - 1) - SPEED + 1;
return capSpeed(speed);
}
private int capSpeed(int speed)
{
if (speed < -SPEED)
return -SPEED;
else if (speed > SPEED)
return SPEED;
else
return speed;
}
private boolean randomChance(int percent)
{
return Greenfoot.getRandomNumber(100) < percent;
}
}
Switch lines 25 and 26. That way, you don't try to fly after actor is removed from laser hit.
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Counter here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Counter extends Actor
{
private int value = 0;
private String text;
public Counter()
{
this("");
}
public Counter(String prefix)
{
text = prefix;
int imageWidth = (text.length() + 2) * 10;
setImage(new GreenfootImage(imageWidth, 16));
updateImage();
}
public void increment()
{
value++;
updateImage();
}
public void updateImage()
{
GreenfootImage image = getImage();
image.clear();
image.drawString(text + value, 1, 12);
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class DeathStar here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class DeathStar extends Actor
{
private int ties = 0;
private int maxTies = 50;
private int imperials = 0;
private int maxImperials = 10;
private Counter tieCounter;
private Counter imperialCounter;
public DeathStar()
{
}
public DeathStar(int numberOfTies, int numberOfImperials)
{
maxTies = numberOfTies;
maxImperials = numberOfImperials;
}
public void act()
{
if (ties < maxTies)
{
if (Greenfoot.getRandomNumber(100) < 10)
{
getWorld().addObject(new Tie(this), getX(), getY());
ties++;
}
}
if (imperials < maxImperials)
{
if (Greenfoot.getRandomNumber(100) < 10)
{
getWorld().addObject(new Imperial(this), getX(), getY());
imperials++;
}
}
}
public void countTie()
{
if (tieCounter == null)
{
tieCounter = new Counter("Tie : ");
int x = getX();
int y = getY() + getImage().getWidth()/2 + 8;
getWorld().addObject(tieCounter, x, y);
}
tieCounter.increment();
}
public void countImperial()
{
if (imperialCounter == null)
{
imperialCounter = new Counter("Imperial : ");
int x = getX();
int y = getY() + getImage().getWidth()/2 + 16;
getWorld().addObject(imperialCounter, x, y);
}
imperialCounter.increment();
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Smiley here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Tie extends Actor
{
private static final int SPEED = 2;
private int deltaX;
private int deltaY;
private DeathStar home;
public Tie(DeathStar home)
{
deltaX = 0;
deltaY = 0;
}
public void act()
{
randomFly();
hitFire();
}
public void hitFire()
{
Actor laser = getOneIntersectingObject(Laser.class);
if (laser != null)
{
getWorld().removeObject(this);
}
else if (isAtEdge() != false)
{
getWorld().removeObject(this);
}
}
public void randomFly()
{
if (randomChance(5))
{
deltaX = adjustSpeed(deltaX);
deltaY = adjustSpeed(deltaY);
}
fly();
}
public void fly()
{
setLocation(getX() + deltaX, getY() + deltaY);
}
private int adjustSpeed(int speed)
{
speed = speed + Greenfoot.getRandomNumber(2*SPEED - 1) - SPEED + 1;
return capSpeed(speed);
}
private int capSpeed(int speed)
{
if (speed < -SPEED)
return -SPEED;
else if (speed > SPEED)
return SPEED;
else
return speed;
}
private boolean randomChance(int percent)
{
return Greenfoot.getRandomNumber(100) < percent;
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Counter here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Counter extends Actor
{
private int value = 0;
private String text;
public Counter()
{
this("");
}
public Counter(String prefix)
{
text = prefix;
int imageWidth = (text.length() + 2) * 10;
setImage(new GreenfootImage(imageWidth + 20, 16));
updateImage();
}
public void increment()
{
value++;
updateImage();
}
public void updateImage()
{
GreenfootImage image = getImage();
image.clear();
image.setColor(Color.WHITE);
Font font = image.getFont().deriveFont(30);
image.setFont(font);
image.drawString(text + value, 1, 12);
}
}
In line 23, you create an image with an height of 16. A string with a height of 30 won’t fit onto the image.
In line 40, you draw the string with the bottom left corner at 12. So only the 12 bottom part of the string show up because the rest is outside the image.
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Missile here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class FalconLaser extends Actor
{
/**
* Act - do whatever the Missile wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public Counter tieCounter;
public Counter imperialCounter;
public FalconLaser()
{
setRotation(270);
tieCounter = new Counter("Ties : ");
imperialCounter = new Counter("Imperials : ");
}
protected void addedToWorld(World world)
{
world.addObject(tieCounter, 150, 150);
world.addObject(imperialCounter, 150, 200);
}
public void act()
{
move(5);
destroyTie();
destroyImperial();
}
public void destroyTie()
{
Tie tie = (Tie) getOneIntersectingObject(Tie.class);
if (tie != null)
{
getWorld().removeObject(tie);
getWorld().removeObject(this);
tieCounter.increment();
}
}
public void destroyImperial()
{
Imperial imperial = (Imperial) getOneIntersectingObject(Imperial.class);
if (imperial != null)
{
getWorld().removeObject(imperial);
getWorld().removeObject(this);
imperialCounter.increment();
}
}
}
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