[Tutorial] Get the block where a projectile Landed.

Hello Bukkit Forums, DevRo_ Here and today im making a tutorial and how to get the Exact block where a projectile landed.

Im going to do a Simple Snowball Spleef Method to get the Exact block where the Snowball landed and remove it.

We are going to use a BlockIterator in the actual ProjectileHitEvent like this:

Code:java

BlockIterator iterator = new BlockIterator(event.getEntity().getWorld(), event.getEntity().getLocation().toVector(), event.getEntity().getVelocity().normalize(), 0.0D, 4);

That code is getting the EXACT location where the projectile landed.

Now we are going to create a variable named hitBlock and nullify it so we get no errors.
The code would be:

Code:java

Block hitBlock = null;

Now we are going to use a:

Code:java

while () {
 
}

To check the Material of the block where the Snowball landed using something like this:

Code:java

while (iterator.hasNext()) {
hitBlock = iterator.next();
 
if (hitBlock.getTypeId() != 0) {
break;
}
}
 
if (hitBlock.getType() == Material.SNOW_BLOCK) {
hitBlock.getWorld().playEffect(hitBlock.getLocation(), Effect.STEP_SOUND, hitBlock.getTypeId());
hitBlock.setType(Material.AIR);
}

As there is no actual method in the BukkitAPI to remove the block we are just setting it to air using:

Code:java

hitBlock.setType(Material.AIR);

Well that would be all for now.
My next tutorial will be on how to create a "Gun" to shoot Snowball and use it to create a Spleef Game.

Regards.

 

Thanks! How would you use this method for dropping items at the location (block) that the projectile landed upon?

 

LegitJava After setting it to air:

Code:java

hitBlock.getWorld().dropItemNaturally(hitBlock.getLocation(), new ItemStack(Material.DROPMATERIAL, 1));

 

So, I have to set the block to Air in order to drop the item? I don't want the block to be removed in my case, I just want it to drop the projectile (snowball) onto the block type.

 

LegitJava well then dont set it to Air.

 

The snowball still won't drop when it hits the block. The floor of the block is Jungle Wooden Planks, I set the material to WOOD_DOUBLE_STEP because I figured that meant wooden planks. However, I'm not sure. Here's my code:

Code:java

 @EventHandler
public void onProjectileHit(ProjectileHitEvent e) {
 
BlockIterator iterator = new BlockIterator(e.getEntity().getWorld(), e.getEntity().getLocation().toVector(), e.getEntity().getVelocity().normalize(), 0.0D, 4);
Block hitBlock = null;
 
ItemStack snowball = new ItemStack(Material.SNOW_BALL, 1);
ItemMeta snowballmeta = snowball.getItemMeta();
snowballmeta.setDisplayName(ChatColor.RED + "Dodgeball!");
List<String> lore = new ArrayList<String>();
lore.add(ChatColor.GREEN + "Throw the dodgeball");
lore.add(ChatColor.GREEN + "at the opposing team");
lore.add(ChatColor.GREEN + "to get them out and");
lore.add(ChatColor.GREEN + "increase your team's score!");
snowballmeta.setLore(lore);
snowball.setItemMeta(snowballmeta);
 
while (iterator.hasNext()) {
hitBlock = iterator.next();
 
if (hitBlock.getTypeId() != 0) {
break;
}
}
 
if (hitBlock.getType() == Material.WOOD_DOUBLE_STEP) {
hitBlock.getWorld().dropItemNaturally(hitBlock.getLocation(), new ItemStack(snowball));
}
}
}

 

LegitJava WHy are you defining again the snowball as a new ItemStack here:

Code:java

hitBlock.getWorld().dropItemNaturally(hitBlock.getLocation(), new ItemStack(snowball));

And to the answer:

1) Are you registering events?
2) If you are use this code instead of yours:

Code:java

@EventHandler
public void onProjectileHit(ProjectileHitEvent e) {
Entity ent = e.getEntity();
 
BlockIterator iterator = new BlockIterator(e.getEntity().getWorld(), e.getEntity().getLocation().toVector(), e.getEntity().getVelocity().normalize(), 0.0D, 4);
Block hitBlock = null;
 
ItemStack snowball = new ItemStack(Material.SNOW_BALL);
ItemMeta snowballmeta = snowball.getItemMeta();
snowballmeta.setDisplayName(ChatColor.RED + "Dodgeball!");
List<String> lore = new ArrayList<String>();
lore.add(ChatColor.GREEN + "Throw the dodgeball");
lore.add(ChatColor.GREEN + "at the opposing team");
lore.add(ChatColor.GREEN + "to get them out and");
lore.add(ChatColor.GREEN + "increase your team's score!");
snowballmeta.setLore(lore);
snowball.setItemMeta(snowballmeta);
 
while (iterator.hasNext()) {
hitBlock = iterator.next();
 
if (hitBlock.getTypeId() != 0) {
break;
}
}
if (ent instanceof Snowball) {
if (hitBlock.getType() == Material.WOOD_DOUBLE_STEP) {
hitBlock.getWorld().dropItem(hitBlock.getLocation(), snowball);
}
}
 

3) IF that still dosent work use

Code:java

if (ent instanceof Snowball) {
            if (hitBlock.getTypeId() == 5 && hitBlock.getData() == 1) {
                hitBlock.getWorld().dropItem(hitBlock.getLocation(), snowball);
            }
        }

 

LegitJava Did that work?

 

DevRosemberg Hi, how would you go about hitting a player? For instance, I do it, when the projectile hits a block, it makes a block, not destroy it. But when I hit a player, it makes a block in mid air... Ideas?

 

xXPumperNickleXx What do you mean a block in mid air?

 

DevRosemberg Like, I hit an entity, and a block will pop up above, behind, or to the left of the person (just examples)

 

xXPumperNickleXx That Happens or you want that to happen?

 

DevRosemberg I Don't want it to happen (sorry I sound stupid)

 

xXPumperNickleXx That shouldnt happen, maybe it broke with 1.7.2, let me check and ill get back to you in some hours, im quite busy atm. Just got hired to code A WorldEdit alternate version so im not going to reply for 1 or 2 hours.

 

DevRosemberg
hey dude, how do I make it so, that when a player get hit by an egg there comes an exploding tnt in their position.
Any ideas?

 

ScrubHunter
Use EntityDamageByEntityEvent, check if the damager entity is an Egg, get the location of the player and spawn a Primed TNT or spawn an explosion.

 

DevRosemberg I have to say I'm kinda a newb for this. I would really preciate a full-code, I will only use it for my server pls, again, not a plugin but just the code <3

 

ScrubHunter

Code:java

@EventHandler
    public void onProjectileHit(EntityDamageByEntityEvent event) {
        if (!(event.getDamager() instanceof Egg)) {
            event.setCancelled(true);
            return;
        }
        event.getEntity().getWorld().createExplosion(event.getEntity().getLocation(), 5, true);
    }

 

Omg thx you're the best!

 

ScrubHunter Thanks.

 

why do you set the event to cancelled if the damager isnt an egg? that would block pretty much all damage from arrows or mobs.

 

SoThatsIt He never asked me to not do it so i though he wanted to cancel the event if it wasnt an egg.

 

DevRosemberg How works it in a runTaskLater?

 

I am sorry for bringing this back, it's just that, I am new to coding, and I keep getting this error on the Event.getEntity, it says: "The Method- getEntity is undefined for type Event. I am sorry if this is obvious, as said before, I am new. Thanks.

 

jmmalcolm3
Your code?

 

DevRosemberg
Auto-correct?

Show Spoiler Hide Spoiler

Always blame the auto-correct

 

Always.

 

Hey, that was great, but what about turning that block back to it's original one after a short amount of seconds?

 

parat26 Store the Block type from which it came in a HashMap with its location. After the amount of time has passed get the block type from the location and set the locations block to that type.

jmmalcolm3 I *think* you where doing org.bukkit.event.Event.getType() which dosent excist.

http://jd.bukkit.org/rb/doxygen/d3/d07/Event_8java_source.html

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