I have this--> getObjectsInRange( 50, Survivor.class);
I'm a beginner though and I don't really know what to do with it.
hosfeldli wrote ...
2018/3/6
How to use this
The getObjectsInRange() method returns a List object.
A java.util.List must be imported first and you can use the List.get(int) method to get stuff that is within the list
Usually you would use a loop to do something with all things in a list:
Hope this helps
PS: I strongly reccommend looking at the Greenfoot API and the javadocs
List<Survivor> list = getObjectsInRange(50, Survivor.class);
for(int i = 0; i < list.size(); i++) {
Survivor s = list.get(i);
// todo: do things with the Survivor object
}
It is true that the 'getObjectsInRange' method returns a List object. That does not, however, necessarily mean you need to import the java.util.List class. Only if you specifically create a variable that is of that type is it necessary. All @hosfeldli needs to do is see if the list is empty and get a reference to the actor in the list, if not:
The only thing that might be improved is the range, as '50' seems like quite a short range.
if (!getObjectsInRange(50, Survivor.class).isEmpty()) // if list is not empty
{
Actor survivor = (Actor)getObjectsInRange(50, Survivor.class).get(0);
turnToward(survivor.getX(), survivor.getY());
}It could also be coded like this without having to import the class:
java.util.List survivors = getObjectsInRange(Survivor.class);
if (!survivors.isEmpty())
{
Actor survivor = (Actor)survivors.get(0);
turnToward(survivor.getX(), survivor.getY());
}What is wrong with this
private Actor getOneObjectInFront(Class c)
{
GreenfootImage myImage = getImage();
int distanceToFront = myImage.getHeight();
int xOffset = (int)Math.ceil(distanceToFront*Math.cos(Math.toRadians(getRotation())));
int yOffset = (int)Math.ceil(distanceToFront*Math.sin(Math.toRadians(getRotation())));
return (getOneObjectAtOffset(xOffset, yOffset, c));
}I did use a youtube video to learn how to do this so if it isn't understandable then I can't help too much. I know what is happening, but that is all
hosfeldli wrote...
I did use a youtube video to learn how to do this so if it isn't understandable then I can't help too much. I know what is happening, but that is allHere is the link
&
https://www.youtube.com/watch?v=BoXn_Fx9898
Try the following return line:
return ((Actor)getOneObjectAtOffset(xOffset, yOffset, c));
You need to login to post a reply.