What code can I use if for example, Object A is the player, Object B is a moving object. If Object A hits Object B it can either be that Object A will be remove or Object A is respawned to its initial location.
dominicarrojado wrote ...
2013/8/28
Object hits an object
I recommend you read through the tutorials in the documentation section of this site. In particular tutorial #3 covers what you are asking.
To check whether object A touches object B you can use this method:
Now you can check whether object A touches object B in your act method.
You just need to know whether you want to remove object A when it touches B or to respawn.
You can use this code to handle this:
//in your A class;
public boolean touchingObjectB() {
return !getOneIntersectingObject(B.class).isEmpty();
}
//instead of B.class you have to use the real classname;//again in your class A;
public void act() {
if (touchingObjectB()) {
if (respawn) {//you have to know whether you want to remove or respawn;
//here your actor is respawned;
getWorld().addObject(new A(), 5, 5);//here you have to use the right classname and the right coordinates for the respawn;
getWorld().removeObject(this);
}
else {
//here your object just gets removed;
getWorld().removeObject(this);
}
}
}
Wouldn't the touchingObjectB method be:
or
Or am I wrong?
public boolean touchingObjectB() {
return !getIntersectingObjects(B.class).isEmpty();
} public boolean touchingObjectB() {
return (getOneIntersectingObject(B.class) != null);
} 
@Zamoht Yes, thanks for the advice. I mixed up the method names. getIntersectingObjects(B.class) is the right method name.
You don't need to use getIntersectingObjects or getOneIntersectingObject at all; you can use the isTouching(...) method.
davmac wrote...
You don't need to use getIntersectingObjects or getOneIntersectingObject at all; you can use the isTouching(...) method.Ah, that gave me the kick I needed to get the USB version updated. Get it now from the download page - it includes BlueJ 3.1.0, Greenfoot 2.3.0, JDK 7, and removes the requirement to unzip at the root of the storage device.
@davmac, thanks. Are there, or have there been any issues I should be aware of with Greenfoot 2.3.0? Have the issues, if any, found with the version been corrected in the USB version?
There's a list of known bugs, including those that have been fixed since the 2.3.0 release, here:
http://bugs.bluej.org/greenfoot/report/11
However, the USB version is identical to the 2.3.0 release except for minor changes in the launcher executable, that is to say it does not include the fixes that have been made since. I don't believe there any issues significant enough to warrant staying at version 2.2.1, particularly since several bugs were fixed between 2.2.1 and 2.3.0. See here (under the 2.3.0 milestone):
http://bugs.bluej.org/greenfoot/report/6
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