Getting Entity Player is Looking At?

Plugins Plugin Development
1

I’m trying to write code that will damage an entity that a player is looking at.

For example, if I am staring at a cow, then the cow takes damage.

I know how to damage a player, so all I need is to know how to get the entity that the player is looking at.

Thanks!

2

Util there is an api for bounding boxes you have use BlockRay.

3

I think there isn’t a “EntityRotationEvent”. So you have to check in a task scheduled with the scheduler. There you use BlockRay.

4

@RandomByte
There is however DisplaceEntityEvent.Move, which is fired when an entity moves. For players it’s DisplaceEntityEvent.Move.TargetPlayer. However, I’m not sure which of these are implemented.

5

Yes, I know. But I don’t know whether it is fired if the player only rotates. I think it shouldn’t because of the naming “Displace”, so place and not general moving.

6

@RandomByte
DisplaceEntityEvent.Move.TargetPlayer is a perfect parallel to Bukkit’s PlayerMoveEvent (but with a better name), it will fire in that case.

7

Ok, then the docs aren’t good:

Called when an {@link Entity} changes position (also known as undergoing displacement).

https://github.com/SpongePowered/SpongeAPI/blob/master/src/main/java/org/spongepowered/api/event/entity/DisplaceEntityEvent.java

8

@RandomByte
I think that rotating counts as changing position

9

Not intuitive to me.

10

Using BlockRay:

Optional<BlockRayHit<World>> optHit = BlockRay.from(player).filter(BlockRay.onlyAirFilter()).build().end();
if (optHit.isPresent()) {
    Vector3d lookPos = optHit.get().getBlockPosition().toDouble();
    Collection<Entity> entities = player.getWorld().getEntities(entity -> entity != player && entity.getLocation().getPosition().distanceSquared(lookPos) < 4);
}

You can set a maximum distance to test for by using blockLimit(total), the default is 1000 blocks.

1 Like
11

Ok. Thank you guys!