int x = getX();
int y = getY();
if(Greenfoot.isKeyDown("left"){
setLocation(x-2, y)
}else if(Greenfoot.isKeyDown("right"){
setLocation(x+2, y)
}
hockeydude1155 wrote ...
2016/10/20
I'm getting an actor not in world error plz help
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The snippet of code given may be where the exception occurred; but, the cause could be anywhere. Please show the entire class code and use code tags (see here).
need source code to look for problems
danpost wrote...
and use code tags (see here).public class Person extends Actor
{
int x = getX();
int y = getY();
public void act()
{
if(Greenfoot.isKeyDown("left"))
{
setLocation (x-2, y);
}
else if(Greenfoot.isKeyDown("right"))
{
setLocation(x+2, y);
}
}
}
Put lines 3 and 4 at the beginning of the act method.
that worked thank you
An easy explanation of why it didn't work is basically you were making x be equal to that getX() so the position should move 2 pixels once and then not work any more cause getX() is changing but not x so for it to work it will generally be like this:
same for up and down (y) but you don't need variables x and y cause you could just do this:
and I wouldn't think you need the else because when the left key is pressed it will go 2 pixels left, when right key is pressed, move right 2 pixels. Two different ifs
(In the future type the code by using the blue word "code" at the bottom of the typing window in discussions (as mentioned above) for more info see here.)
public class Person extends Actor
{
int x;
int y;
public void act()
{
x=getX();
y=getY();
if(Greenfoot.isKeyDown("left"))
{
setLocation(x-2,y);
}
if(Greenfoot.isKeyDown("right"))
{
setLocation(x+2,y);
}
}
}public class Person extends Actor
{
public void act()
{
if(Greenfoot.isKeyDown("left"))
{
setLocation(getX()-2,getY())
}
if(Greenfoot.isKeyDown("right"))
{
setLocation(getX()+2,getY())
}
}
}danpost wrote...
The snippet of code given may be where the exception occurred; but, the cause could be anywhere. Please show the entire class code and use code tags (see here).Nosson1459 wrote...
where did you get this link from and how do you know about it?Nosson1459 wrote...
An easy explanation of why it didn't work is basically you were making x be equal to that getX() so the position should move 2 pixels once and then not work any more Super_Hippo wrote...
Well, the easy explanation why it didn't work is that you can't use methods which require the actor to be in the world outside methods because they are executed when the object is created, so before it was added to the world.danpost wrote...
Look under the 'Post a reply' box (on this page when signed in). There are two links there -- one for embedding and the other for posting code.Nosson1459 wrote...
Do you know if it is possible to post an image that I have on my computer
why so Absolute you just said I can do it if I upload it.
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