[Bow] Help With Archery

Hello my felloe Bukkitians,
I was wondering if there was a way to make it so when someone shoots an arrow and hits another entity, a play in specific it would bounce twice at most. Ok so your probably confused right? But don't worry he comes the hardcore breakdown of this. If the Damager(The Arrow Shooter) shoots a bow and it(the arrow) hits another entity(Another Player) the arrow has the potential to bounce off and hit up to two more entities(two other players), but it would only bounce off to players within a certain radius around the hit entity.
Thank you in advanced.

 

Hmmmm not too sure if it would be possible to fire another arrow to a nearby player. However, you could damage players around the location where the arrow landed.

 

Wouldn't you be able to change the velocity of which the arrow is going?
I'm not so good with this but I think this MIGHT be possible to a extent.

Also, I've seen you on the forums a lot! Thanks for helping others out! +1

 

Maybe you could get an entity that is less than a certain distance from the player that got hit. You then make the player that got hit fire an arrow and set the vector so that it goes toward the entity close to the player that got hit.

 

I've seen it done on a server so it is possible. How they did it, I don't know exactly. They are a couple methods that I have in mind that could work.

 

How about getting a player that is nearby and changing the spawning a arrow at the direction of that player where the last arrow landed. It might look like a double bounce.

 

TheCwispyOne BeefySticks Monkey_Swag teej107
EDIT: I Don't mind if the arrow "bounces" I'm mainly wondering how to damage another entity within a distance of the attacked entity. Thanks in advanced. And thanks for the current replies.

 

sethrem
I created this code real quick for you!

Code:java

 
    @EventHandler
    public void onDamage(EntityDamageEvent event) {
    Player player = (Player) event.getEntity();
    DamageCause arrow = event.getCause();
    double radius = 3D;
    List<Entity> nearplayers = player.getWorld().getEntities();
 
    if(arrow.PROJECTILE != null) {
 
        // CHECK IF IS ARROW
 
 
        for(Entity e : nearplayers) {
            if(event.getEntity() instanceof Player && event.getEntity() != null) {
                ((Damageable) e).damage(3);
        }
    }
    }
    } 
}

 

BeefySticks thanks for the nice comment. I love to help people out. I used to get help (and still do). I just want to give back to the community

 

That code erm.... could use some work.

• Your not using the radius variable
• nearplayers is targeting every entity in the world
• arrow.PROJECTILE != null will always be true
• event.getEntity() instanceof Player is also a null check, not need for event.getEntity() != null

To fix:

1. You want near players? getNearbyEntities(double x, double y, double z)
2. To properly check is the projectile is an arrow.... I would actually use the EntityDamageByEntityEvent since it has this: getDamager(). You can then do
   Code:java

   getDamager() instanceof Arrow

   to properly check if the damager is an arrow.

 

I can't manage to get it, could you please provide me with some code?

 

Thanks for correcting me!

 

You give me your attempted code and we can work off of that. You can also use BeefySticks code as long as you apply the fixes I suggested.

 

So wait... Do you want it to bounce a certain direction? Or to bounce always towards another entity in range?
Either way I can help you guys write something.

 

teej107 I mean it works but it doesn't register the player as a "death" and I get an error every single time I shoot the arrow at a person.

Code:java

 List<Entity> nearplayers = victim.getNearbyEntities(3.0, 3.0, 3.0);
for (Entity e2 : nearplayers) {
if (victim instanceof Player) {
((Damageable) e2).damage(20.0);
victim.damage(20.0);
}
}

Then The Error

Code:java

[16:28:59 ERROR]: Could not pass event EntityDamageByEntityEvent to OITQ v1.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:481) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:466) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:94) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:382) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:410) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.EntityLiving.damageEntity(EntityLiving.java:656) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.EntityHuman.damageEntity(EntityHuman.java:746) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.EntityPlayer.damageEntity(EntityPlayer.java:446) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.EntityArrow.h(EntityArrow.java:228) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.World.entityJoinedWorld(World.java:1338) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.World.playerJoinedWorld(World.java:1319) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.World.tickEntities(World.java:1207) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.WorldServer.tickEntities(WorldServer.java:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:637) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R1.entity.CraftArrow cannot be cast to org.bukkit.entity.Damageable
at me.events.PlayerListener.onHit(PlayerListener.java:137) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_11]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_11]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_11]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_11]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
... 19 more

Line 137 is :

Code:java

((Damageable) e2).damage(20.0);

Bounce towards another entity within a certain radius of the first hit(Player who got hit by the bow) player.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

This line is what is throwing the error...
((Damageable) e2).damage(20.0);
Probably because not all entities are damageable. Add a check.


Ok alot of things were misplaced.
So like this:

Code:java

                List<Entity> nearplayers = victim.getNearbyEntities(3.0, 3.0, 3.0);             
                for (Entity e2 : nearplayers) {
                    if (e2 instanceof Player) {
                        ((Damageable) e2).damage(20.0);
                    }
                }
                victim.damage(20.0);

 

Code:java

        if(event.getEntity() instanceof Player && event.getDamager() instanceof Arrow){
            Arrow arrow = event.getDamager();
            if(arrow.getShooter() != null && arrow.getShooter() instanceof Player){
                Random rand = new Random();
                if((rand.nextInt((max - min) + 1) + min) == 1){
                    List<Entity> nearby = event.getEntity().getNearbyEntities(radius, radius, radius);
                    if(nearby.size() > 0){
                        for(Entity e : nearby){
                            if(e instanceof Player && e.getId() != event.getEntity().getId() && e.getId() != event.getDamager().getId()){
                                Arrow a = arrow.getLocation().getWorld().spawnEntity(arrow.getLocation(), EntityType.ARROW);
                                a.setShooter(arrow.getShooter());
                                Vector vec = new Vector((e.getLocation().getX() - event.getEntity().getLocation().getX()), 0, (e.getLocation().getZ() - event.getEntity().getLocation().getZ()));
                                a.setVelocity(vec.multiply(0.3));
                                break;
                            }
                        }
                    }
                }
            }
        }

This is what I would do for bouncing from one player to the next only one time. You'll have to find a way to make it bounce a second time yourself.

This code will check if the damaged entity is a player, check if the damager is an arrow, check if the arrow's shooter is a player, generate a chance, get any nearby players within a certain radius, and spawn a new arrow and set its velocity towards a nearby player.

 

I would use MetaData. But, it appears that my eclipse crashed. So it isn't done.
But I finished it in notepad++... Should work.

Code:java

@EventHandler
public void onEntityDamageByEntityEvent(EntityDamageByEntityEvent e) {
if(e.getCause()==DamageCause.PROJECTILE) {
if(e.getDamager() instanceof Arrow && e.getEntity() instanceof Player) {
Player player = (Player) e.getEntity();
Arrow arrow = (Arrow) e.getDamager();
Object o = getMetadata(arrow, "Bounces", this);
int bounces = 0;
if(o!=null)
bounces = ((int) o);
if(bounces<2) {
List<Entity> nearplayers = player.getNearbyEntities(3.0, 3.0, 3.0);
Player closest = null;
for (Entity e2 : nearplayers) {
if (e2 instanceof Player) {
if(closest==null)
closest = (Player) e2;
if(e2.getLocation().distance(player.getLocation())<closest.getLocation().distance(player.getLocation()))
closest = (Player) e2;
}
}
if(closest!=null) {
Vector v = new Vector(closest.getLocation().getX()-player.getLocation().getX(),//I'm not sure if I got the vectors right... Please don't beat me up D:
0.2,//This value could use some tweaking
closest.getLocation().getZ()-player.getLocation().getZ());
Arrow arr = player.getWorld().spawnArrow(arrow.getLocation(), v.multiply(1.1D), 1F/*These could use some tweaking too*/, 0F);
arr.setShooter(arrow.getShooter());
setMetadata(arr, "Bounces", bounces+1, this);
}
}
}
}
}
 
public void setMetadata(Metadatable object, String key, Object value, Plugin plugin) {
object.setMetadata(key, new FixedMetadataValue(plugin, value));
}
 
public Object getMetadata(Metadatable object, String key, Plugin plugin) {
List<MetadataValue> values = object.getMetadata(key);
for (MetadataValue value : values) {
if (value.getOwningPlugin() == plugin) {
return value.value();
}
}
return null;
}

Let me know!



EDIT: I got my eclipse working again and tested it out.
It needed an update. The code above has been tweaked.
It works!

Oh, and if you are using eclipse, I'd recommend Control(Or Command)+Shift+F to fix the formatting issues from bukkits website.