Shooting a Projectile Straight

I was wondering how to have a projectile shoot straight?

Code:java

@EventHandler
public void KakeCannon(PlayerInteractEvent e) {
 
final Player player = e.getPlayer();
Location location = player.getEyeLocation();
 
if (player.getItemInHand() != null && player.getItemInHand().getType() != Material.AIR) {
if (player.getItemInHand().hasItemMeta() && player.getItemInHand().getItemMeta().hasDisplayName()) {
if (player.getItemInHand().getType() == Material.BREWING_STAND_ITEM && player.getInventory().getItemInHand().getItemMeta().getDisplayName().equalsIgnoreCase("§cK§fa§ck§fe§8 Cannon") && e.getAction() == e.getAction().LEFT_CLICK_BLOCK || player.getItemInHand().getType() == Material.BREWING_STAND_ITEM && player.getInventory().getItemInHand().getItemMeta().getDisplayName().equalsIgnoreCase("§cK§fa§ck§fe§8 Cannon") && e.getAction() == e.getAction().LEFT_CLICK_AIR) {
if (player.hasPermission("use.kakecannon")) {
 
if(System.currentTimeMillis() - (countdown3.containsKey(player.getName()) ? countdown3.get(player.getName()) : 0) >= 1500) {
final Arrow arrow = player.getWorld().spawn(location, Arrow.class);
arrow.setShooter(player);
arrow.setCritical(false);
arrow.setKnockbackStrength(0);
arrow.setVelocity(location.getDirection().normalize().multiply(4));
Item item = player.getWorld().dropItem(location, new ItemStack(Material.CAKE, 1));
item.setPickupDelay(6020);
arrow.setPassenger(item);
map.put("KakeCannon", arrow);
map.put("KakeCannonPlayer", player);
countdown3.put(player.getName(), System.currentTimeMillis());
} else player.sendMessage("§4Please wait for cooldown");
} else player.sendMessage("§4You do not have permission");
}
}
}
}

Code:java

@EventHandler
public void KakeCannonLanding(EntityDamageByEntityEvent e) {
 
Entity arrow = map.get("KakeCannon");
Entity player = map.get("KakeCannonPlayer");
Entity hurt = e.getEntity();
 
if (player instanceof Player) {
Vector velocity = ((Player) player).getEyeLocation().getDirection();
 
if (e.getDamager() == arrow) {
if (hurt != player) {
 
final Block block = hurt.getLocation().getBlock();
Location kakeLocation = arrow.getLocation();
kakeLocation.add(velocity.getX(),0,velocity.getZ());
player.getWorld().createExplosion(kakeLocation.getX(), kakeLocation.getY(), kakeLocation.getZ(), 4, false, false);
arrow.remove();
Item item = player.getWorld().dropItem(hurt.getLocation(), new ItemStack(Material.CAKE, 1));
item.setPickupDelay(6020);
map.remove("KakeCannon");
map.remove("KakecannonPlayer");
if (hurt.isDead() == true) {
if (hurt.getLocation().getBlock().getType() == Material.AIR) {
hurt.getLocation().getBlock().setType(Material.CAKE_BLOCK);
}
}
 
//delay
Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
public void run() {
block.setType(Material.AIR);
}
}, 100L);
}
}
}
}

I tried .getDirection.multiply() (line 17)
but when I put a high number, it starts to explode on me.

 

AFAIK, I don't think you can change the effect that gravity has on Entities. You could try going into NMS (which I would have no idea where to start) or you could try using a scheduler and teleport the entity to the desired Y level every tick which could cause a lag.

 

teej107 It would require nms, All you do is make it so the y value never changes. Basically override the move method.

 

So nms is the ONLY way?

 

moo3oo3oo3 You could use vectors although it wouldn't look that smooth.

 

What is nms...

 

moo3oo3oo3
Basically it's using the actual craftbukkit jar (the thing that runs and loads plugins, aka the bukkit MOD) and replacing the code for your projectile with the code you want. Without looking into it further, you'd probably be editing the launch vectors of the projectile.

 

net.minecraft.server, the Minecraft server package included in Bukkit. Using NMS, you have more control because you're changing things directly in the server source, and more things are included in most NMS classes for you to override and change.