BlockPlaceEvent Help

Hello,
I would like to ask the question on how would I check if the block under the placed block is a VOID block meaning that players can place blocks like for making structures can't place blocks ontop of this.


Thanks in advanced.

 

Just an idea I got:
1. Get the placed block
2. Get coordinates, then minus amounts.
3. Check if those coords are Material.AIR

Seems inefficient, just a general rundown. I'll possibly get back to you with another idea on how to do it.

 

WesJD Alright mate thanks because the way you said is the way I did it but it wouldn't allow players to regularly build structures like houses and what not

 

sethrem
How so?

 

I did this recently, I just did a check to make sure the placed block was inside the allowed X and Z range. Not sure if that applies to your situation or not.

 

WesJD well think of it this way, the method you said would differentiate if someone is making a sky tower, but in my picture it would be easy to just subtract one y coordinate but in other cases not, this is my issue.

 

sethrem
Loop through the world height?

 

@WesJDhdmu that wouldn't help either because if there is a mountain for example that height won't eb build able on, I'm trying to do this for a sort of sky block minigame

 

sethrem
So basically there's a set boundary and players can't build out of their boundary?

 

Gater12 Well not exactly there are islands and teams and I don't want players extending their islands so I'm trying to make it so you can place blocks above void, which would be below bedrock, to the sides of the island. So yea basically kind of like a boundary but not really.

 

sethrem
So it's a boundary. Simply define it as one (in code) and test if the player is building out of his/her boundary.

 

Gater12 No not exactly because there are mulyiple islands and it would take ages to do so. I just want to make it so players can't build on top of void.

 

sethrem Do you mean build at the void (y = 0), build above the void (y > 0), or build below the void (y < 0)? If you mean the last one, I'm pretty sure you can't place blocks below void level.

 

pookeythekid I mean above it. Like if there are blocks under you no matter how far down, you can build on top of it. But if there are no blocks under the block you placed then you can't build.

 

sethrem
This might work, I haven't tested it though.
You pass the block location in here:

Code:java

    public boolean isVoid(Location l){
        for(int y = 0; y < 256; y++){
            if(l.getWorld().getBlockAt(l.getBlockX(), y, l.getBlockZ()) != null || l.getWorld().getBlockAt(l.getBlockX(), y, l.getBlockZ()).getType() == Material.AIR){
                return false;
            }
        }
        return true;
    }

 

msnijder30 Thanks mate but I already got it working, I did it differently than you.