Make an arrow follow a target!

Hey! So I need to make arrows that follow the nearest entity and kills it instantly! How can I do it?

 

You should know how this forum works.
Give us some existing code and an error and we are willing to help.
For everything else: Google is your friend.

 

Run a task which changes the arrows veloctiy/direction each tick to let it fly either directly towards the target, or maybe only a smal step towards the target (so that the arrows flies in a curve rather than a direct line).

As an example: https://github.com/blablubbabc/Boun...ubbabc/bouncingarrows/BouncingArrows.java#L99

Though the particles in this version do no longer work, and you might consider creating one repeating task instead of many delayed tasks for each flying arrow.

 

blablubbabc Noxyro HeavyMine13
Copy and paste from SethBling's plugin.

Code:java

public class HomingTask
extends BukkitRunnable
{
private static final double MaxRotationAngle = 0.12D;
private static final double TargetSpeed = 1.4D;
Arrow arrow;
LivingEntity target;
 
public HomingTask(Arrow arrow, LivingEntity target, Plugin plugin)
{
this.arrow = arrow;
this.target = target;
runTaskTimer(plugin, 1L, 1L);
}
 
public void run()
{
double speed = this.arrow.getVelocity().length();
if ((this.arrow.isOnGround()) || (this.arrow.isDead()) || (this.target.isDead()))
{
cancel();
return;
}
Vector toTarget = this.target.getLocation().clone().add(new Vector(0.0D, 0.5D, 0.0D)).subtract(this.arrow.getLocation()).toVector();
 
Vector dirVelocity = this.arrow.getVelocity().clone().normalize();
Vector dirToTarget = toTarget.clone().normalize();
double angle = dirVelocity.angle(dirToTarget);
 
 
 
double newSpeed = 0.9D * speed + 0.14D;
if (((this.target instanceof Player)) && (this.arrow.getLocation().distance(this.target.getLocation()) < 8.0D))
{
Player player = (Player)this.target;
if (player.isBlocking()) {
newSpeed = speed * 0.6D;
}
}
Vector newVelocity;
Vector newVelocity;
if (angle < 0.12D)
{
newVelocity = dirVelocity.clone().multiply(newSpeed);
}
else
{
Vector newDir = dirVelocity.clone().multiply((angle - 0.12D) / angle).add(dirToTarget.clone().multiply(0.12D / angle));
newDir.normalize();
newVelocity = newDir.clone().multiply(newSpeed);
}
this.arrow.setVelocity(newVelocity.add(new Vector(0.0D, 0.03D, 0.0D)));
this.arrow.getWorld().playEffect(this.arrow.getLocation(), Effect.SMOKE, 0);
}
}

Code:java

public class HomingArrows
extends JavaPlugin
implements Listener
{
public void onEnable()
{
getServer().getPluginManager().registerEvents(this, this);
}
 
public void onDisable()
{
}
 
@EventHandler
public void eventArrowFired(EntityShootBowEvent e)
{
if (((e.getEntity() instanceof LivingEntity)) && ((e.getProjectile() instanceof Arrow)))
{
LivingEntity player = e.getEntity();
 
double minAngle = 6.283185307179586D;
Entity minEntity = null;
for (Entity entity : player.getNearbyEntities(64.0D, 64.0D, 64.0D)) {
if ((player.hasLineOfSight(entity)) && ((entity instanceof LivingEntity)) && (!entity.isDead()))
{
Vector toTarget = entity.getLocation().toVector().clone().subtract(player.getLocation().toVector());
double angle = e.getProjectile().getVelocity().angle(toTarget);
if (angle < minAngle)
{
minAngle = angle;
minEntity = entity;
}
}
}
if (minEntity != null) {
new HomingTask((Arrow)e.getProjectile(), (LivingEntity)minEntity, this);
}
}
}
}

 

SuperOmegaCow


Please give credit to the author, SethBling.
Official download: http://sethbling.com/media/5920/blinghomingarrows.jar

 

@SuperOmegaCow Lol *cough* BlingHomingArrows *cough*

 

SuperOmegaCow Don't just paste other people's code in without any credit whatsoever...

And don't spoonfeed people either.

 

True, ill make my own code!