I want to add a potion effect to to a player, if the player is near a block (10 square blocks for example), and remove it if the player goes away.

 

Basically somethink like the beacon does, but i've not found anything

Try looking at the beacon code then.

 

If all else fails use getEntityWithinAABB (and other methods)

Try looking at the beacon code then.

 

If all else fails use getEntityWithinAABB (and other methods)

Will this return a list of the players within 5 blocks from my custom one?

 

double range = 5.0;
List list = world.getEntitiesWithinAABB(EntityPlayer.class, AxisAlignedBB.getBoundingBox(x - range, y - range, z - range, x + range, y + range, z + range));

Will this return a list of the players within 5 blocks from my custom one?

 

double range = 5.0;
List list = world.getEntitiesWithinAABB(EntityPlayer.class, AxisAlignedBB.getBoundingBox(x - range, y - range, z - range, x + range, y + range, z + range));

 

No, It will return a list of the entities in 11*11*11 Box surrounding the block.

 

If you want to get the lists of the entities in 10 block-distance,

You have to check for each entity if the squared distance is smaller than 10*10.

I have a problem with this code:

public void updateEntity()
{
    	super.updateEntity();
    	
	float f = 5.0F;

	double minX = (float)this.xCoord - f;
	double minY = this.yCoord - f;
	double minZ = this.zCoord - f;
	double maxX = (this.xCoord + 1) + f;
	double maxY = (this.yCoord + 1) + f;
	double maxZ = (this.zCoord + 1) + f;

	List list = this.worldObj.getEntitiesWithinAABB(EntityPlayer.class, AxisAlignedBB.getAABBPool().getAABB(minX, minY, minZ, maxX, maxY, maxZ));

        if(list.size() != 0)
        {
        	for(int i = 0; i < list.size(); ++i)
        	{
        		EntityPlayer entityPlayer = (EntityPlayer) list.get(i);
        		
        		entityPlayer.addPotionEffect(new PotionEffect(10, 2, 0, false));
        	}
        }

 

If the player is nearer then 5 block from my custom one, the he gets a potion effect, but when he goes away more than 5 block, he still has the potion effect.

 

How can i remove it if the player goes away?

Someone?