I'm trying to pass a value from an actor to the world so that when I create the new actor, I can pass that value to the new actor. However, I get an error stating "non-static method getWormsEaten cannot be referenced from a static context".
Here is the code:
Crab
World
Please help! If there is an easier way to accomplish this task, please let me know! Thanks!
public class Crab extends Animal
{
private GreenfootImage image1;
private GreenfootImage image2;
private int wormsEaten = 0;
/**
* Creates a new crab, assigns both images, and sets wormsEaten to 0.
*/
public Crab()
{
image1 = new GreenfootImage("crab.png");
image2 = new GreenfootImage("crab2.png");
setImage(image1);
}
public void act()
{
checkKeypress();
lookForWorm();
}
/**
* Check whether we have stumbled upon a worm.
* If we have, eat it, and increase wormsEaten by 1 and add 10 points to the score.
* If not, do nothing.
* If we have eaten 10 worms in CrabWorld, load CrabWorld2.
* If we have eaten 10 worms in CrabWorld2, the game ends.
*/
public void lookForWorm()
{
if ( canSee(Worm.class) )
{
if (getWorld() instanceof CrabWorld)
{
((CrabWorld)getWorld()).getScoreCounter().add(10);
}
else if(getWorld() instanceof CrabWorld2)
{
((CrabWorld2)getWorld()).getScoreCounter().add(10);
}
eat(Worm.class);
Greenfoot.playSound("slurp.wav");
wormsEaten++;
if (wormsEaten == 10)
{
int curscore;
int curlives;
Greenfoot.playSound("fanfare.wav");
if (getWorld() instanceof CrabWorld)
{
curscore = ((CrabWorld)getWorld()).getScoreCounter().getValue();
curlives = ((CrabWorld)getWorld()).getLifeCounter().getValue();
Greenfoot.setWorld(new CrabWorld2(curscore, curlives));
}
else if(getWorld() instanceof CrabWorld2)
{
((CrabWorld2)getWorld()).gameOver();
}
}
}
}
/**
* Allows user to move the crab using up, down, left, and right arrow keys.
* If the crab collides with a rock, the crab cannot proceed.
*/
public void checkKeypress()
{
if (Greenfoot.isKeyDown("up"))
{
setLocation(getX(), getY()-4);
switchImage();
if (getOneIntersectingObject(Rock.class) != null)
{
setLocation(getX(), getY()+4);
}
}
if (Greenfoot.isKeyDown("down"))
{
setLocation(getX(), getY()+4);
switchImage();
if (getOneIntersectingObject(Rock.class) != null)
{
setLocation(getX(), getY()-4);
}
}
if (Greenfoot.isKeyDown("left"))
{
move(-4);
switchImage();
if (getOneIntersectingObject(Rock.class) != null)
{
move(4);
}
}
if (Greenfoot.isKeyDown("right"))
{
move(4);
switchImage();
if (getOneIntersectingObject(Rock.class) != null)
{
move(-4);
}
}
}
/**
* Switches images as the crab moves.
*/
public void switchImage()
{
if ( getImage() == image1 )
{
setImage(image2);
}
else
{
setImage(image1);
}
}
public int getWormsEaten()
{
return wormsEaten;
}
public void setWormsEaten(int worms)
{
wormsEaten = worms;
}
}public class CrabWorld extends World
{
private ScoreCounter scoreCounter;
private LifeCounter lifeCounter;
public int numlives = 3;
/**
* Creates World. The world has a size of 650x650 cells.
* Adds a score counter and life counter.
*/
public CrabWorld()
{
super(650, 650, 1);
populateWorld();
scoreCounter = new ScoreCounter("Score: ");
addObject(scoreCounter, 600, 15);
lifeCounter = new LifeCounter("Lives: ");
addObject(lifeCounter, 600, 27);
}
/**
* Populates world with the player crab, 10 worms, and 3 lobsters.
*/
public void populateWorld()
{
addObject( new Crab(), 100, 100 );
addObject( new Worm(), 150, 350);
addObject( new Worm(), 200, 50);
addObject( new Worm(), 250, 500);
addObject( new Worm(), 300, 150);
addObject( new Worm(), 350, 400);
addObject( new Worm(), 400, 600);
addObject( new Worm(), 450, 100);
addObject( new Worm(), 500, 450);
addObject( new Worm(), 550, 200);
addObject( new Worm(), 100, 550);
addObject( new Lobster(), 100, 600);
addObject( new Lobster(), 550, 100);
addObject( new Lobster(), 550, 600);
}
/**
* Returns score counter when switching world or at game over.
*/
public ScoreCounter getScoreCounter()
{
return scoreCounter;
}
/**
* Returns life counter when switching worlds.
*/
public LifeCounter getLifeCounter()
{
return lifeCounter;
}
/**
* Checks number of lives remaining when crab is eaten. If lives run out, game over.
*/
public int checkLives()
{
if(numlives > 0)
{
int worms;
worms = Crab.getWormsEaten(); //here is the problem line
addObject(new Crab(setWormsEaten(worms)), 100, 100 );
numlives--;
if (numlives == 0)
{
gameOver();
Greenfoot.stop();
}
}
return numlives;
}
/**
* Displays game over screen.
*/
public void gameOver()
{
addObject(new ScoreBoard(getScoreCounter().getValue()), getWidth()/2, getHeight()/2);
}
}