hi, I want to make the lobster a tiny bit fatter each time he eats the crab. how do i do this?
ctgreenfoot wrote ...
2013/1/12
make lobster fatter
You could change his image like this:
//in your lobster class;
public void act() {
if (wormEaten()) {
getImage().scale(getImage().getWidth()*110, getImage().getHeight()*110);
}
}
//or you can use this method:
//you call the method like this: scaleImage(getImage(), 110); or any other size (in percent);
public void scaleImage(GreenfootImage img, int size) {
img.scale((img.getWidth()*size/100), (img.getHeight()*size/100));
}its says found void but expected boolean
could you post your code?
import greenfoot.*;
public class Lobster extends Animals
{
public Lobster()
{
}
public void act()
{
moveAround();
eatCrab();
if (eatCrab())
getImage().scale(getImage().getWidth()*110, getImage().getHeight()*110);
} your method eatCrab() is a void but your are using it like a boolean because you used it in the if statement you could use a boolean variable for this or (what would be easyer) you could just delete the if statement and ad the code in line 14 to the eatCrab method.
i tried deleting the if statement and adding the code but now what happens is that when the lobster eats the crab, greenfoot stops and the crab goes back to its original position.
here is my code:
also a terminal error window comes up. please help!
import greenfoot.*;
public class Lobster extends Animals
{
public Lobster()
{
}
public void act()
{
moveAround();
eatCrab();
}
private void moveAround()
{
move(5);
if (Greenfoot.getRandomNumber (100) < 10)
{
turn(Greenfoot.getRandomNumber (90)-45);
}
if (atWorldEdge())
{
turn(180);
}
}
public boolean atWorldEdge()
{
if (getX() <= 5 ||
getX() >= getWorld() . getWidth() -5 ||
getY() <= 5 ||
getY() >= getWorld() . getHeight() -5)
return true;
return false;
}
private void eatCrab()
{
Actor crab;
crab = (Crab)getOneObjectAtOffset (0,0,Crab.class);
if (crab != null)
{
int x = Greenfoot.getRandomNumber(getWorld().getWidth());
int y = Greenfoot.getRandomNumber(getWorld().getHeight());
crab.setLocation(x, y);
getImage().scale(getImage().getWidth()*110, getImage().getHeight()*110);
Greenfoot.playSound ("eating.wav");
}
}
}what is the exception you get in the terminal window?
java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferInt.<init>(DataBufferInt.java:41)
at java.awt.image.Raster.createPackedRaster(Raster.java:458)
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1015)
at java.awt.image.BufferedImage.<init>(BufferedImage.java:324)
at apple.awt.CGraphicsConfig.createCompatibleImage(CGraphicsConfig.java:133)
at greenfoot.util.GraphicsUtilities.createCompatibleTranslucentImage(GraphicsUtilities.java:179)
at greenfoot.GreenfootImage.scale(GreenfootImage.java:403)
at Lobster.eatCrab(Lobster.java:48)
at Lobster.act(Lobster.java:12)
at greenfoot.core.Simulation.actActor(Simulation.java:565)
at greenfoot.core.Simulation.runOneLoop(Simulation.java:523)
at greenfoot.core.Simulation.runContent(Simulation.java:213)
at greenfoot.core.Simulation.run(Simulation.java:203)
Ok that is probably not because of the method I posted.
The problem in this case is that the heap space (heap is a part of the RAM) which is reserved by greenfoot is not enought.
The bad thing is that you can't do anything against this Errors.
The good thing is that greenfoot should work normaly after a restart.
Uh, actually Gevater_Tod4711, I think its because you misspelled your code. You wrote:
where you meant to write:
Your code was trying to increase the size of the lobster 110 times instead of just ten percent.
getImage().scale(getImage().getWidth()*110, getImage().getHeight()*110);
getImage().scale((getImage().getWidth()*110/100), (getImage().getHeight()*110)/100);
oh yes.
Sorry that was my fail.
Thank you MatheMagician.
thank you both! it works now
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