I feel really bad that I can't figure this out. I've tried for days now and I'm sure there's a really simple solution. What I want is this: When EntityPlayer moves on ground, specifically the block, grass, I want the grass to change to a different block. This change has to be constant as they travel around the world. Any help is greatly appreciated!

Edited June 14, 20187 yr by LittleOne

The question is do you want it to change from grass to dirt then coarse dirt after a certain amount of time or just dirt.

To Stone. Apologies, I should have mentioned that. Is this possible?

do you want the block to change while sprinting or walking?

Whenever the entity is on ground. Both, I suppose.

what version of minecraft? Because 1.13 Broke a lot of mechanics for items, blocks and entities.

I have not had a lot of time to have a look myself to check whats changed. So if its 1.13 then your going to need to ask a person 

then me sorry I've only just go back to coding mods 2 days ago the last version i coded was 1.8 sorry.

1.12.2, By the way, thank you for responding quickly. I'm looking for a hint or two in the right direction, even if it is outdated.

If you know to basis for how farmland changes to dirt by jumping on it that might help sorry i can help you anymore

You should usually post what you've tried so we can tell what kind of help you need.

 

Basically, you can use a player tick event handler and check if the player is on the ground (there is a public field called onGround) and if that is true, then just check the block in the position under the player position to confirm it is grass or whatever and then set that block to stone or whatever.

public void onLivingUpdateEvent(LivingUpdateEvent event) {
		event.getEntity();
		if(event.getEntity() instanceof EntityPlayer) {
			EntityPlayer player = (EntityPlayer) event.getEntity();
			BlockPos playerUPos = player.getPosition().down();
			IBlockState playerUState = (IBlockState)playerUPos;
			Block playerUBlock = (Block)playerUState;
			IBlockState grassState = Blocks.GRASS.getDefaultState();
			if(player.onGround && playerUBlock == Blocks.GRASS) {
				
			}
		}
	}
}

Something like this? Or am I missing something? If I need more java experience before doing this, I will accept that. Thank you in advance. How to set blockstate next?

Edited June 14, 20187 yr by LittleOne

Yes, that is the general idea. There is actually a PlayerTickEvent which is a bit more specific, which I prefer because it is a bit wasteful to call your method for every living entity, but since you test immediately for player it probably isn't a bit deal.

 

I don't think your methods for checking the block and setting the block are quite right. It looks like you're trying to directly cast the position into the block state. Instead you should use the player world (player.world) and use the getBlockState() method.

 

Also generally shouldn't compare to the default state. It would work for grass because I think it doesn't have any properties, but I'd probably do it like this:
 

if (player.onGround && player.world.getBlockState(playerUPos).getBlock() == Blocks.GRASS))

 

and to set the block something like:

player.world.setBlockState(Blocks.STONE.getDefaultState())

 

  On 6/14/2018 at 1:11 AM, LittleOne said:

IBlockState playerUState = (IBlockState)playerUPos;

Block playerUBlock = (Block)playerUState;

You really should look at the IBlockState interface. IBlockStates are not Blocks. They are a wrapper around Block+Metadata.

Solved! Thanks for your clarification and help. I will also look at the IBlockState Interface. Also, it's working!

@SubscribeEvent
	public void onPlayerTickEvent(PlayerTickEvent event) {
		if(event.player instanceof EntityPlayer) {
			EntityPlayer player = (EntityPlayer) event.player;
			BlockPos playerUPos = player.getPosition().down();
			IBlockState playerUState = player.world.getBlockState(playerUPos);
			if (player.onGround && player.world.getBlockState(playerUPos).getBlock() == Blocks.GRASS) {
				player.world.setBlockState(playerUPos, Blocks.STONE.getDefaultState());
			}
		}
	}