SOLVED Entity Move Event

[T.S.White]

SOLVED

For anyone else who has questions like these, here's my working code:

Spoiler

@SubscribeEvent

public static void makePath(LivingUpdateEvent event) {

 

 

if (event.getEntityLiving() != null && event.getEntityLiving() instanceof EntityPlayer)

{

Entity player = event.getEntity();

BlockPos playerLocation = new BlockPos(player.posX, player.posY + player.getYOffset(), player.posZ);

World world = player.getEntityWorld();

IBlockState state = world.getBlockState(playerLocation);

Block block = state.getBlock();

 

 

if (block instanceof BlockGrass)

{

world.setBlockState(playerLocation, Blocks.DIRT.getDefaultState());

}

}

    }

 

Hey guys, I'm back at this trying to figure it all out. Aaaand I'm sure the info I want is posted. somewhere. out there. on the wide interwebz. But I can't find it.

 

I need an event that's triggered when an entity walks, with different effects for different types of vanilla blocks. ie. Redstone Ore lights up when you walk on it via onEntityWalk.

Forge doesn't seem to have a hook for this, or any event that gets called from the blocks themselves, which I guess is understandable given the entity/tile/don't call things from blocks issues.

 

So I guess I need a custom event - either one that utilizes the pretty simple, already-there onEntityWalk, or one that checks if an entity has moved, and then checks what block it's standing on. And I cannot, for the life of me, find a current tutorial on how to do that. There are allusions to it, but any solid information I've found is from many versions ago and no longer accurate.

 

Links? Help? Please?

Thanks!

-T

 

 

PS. If I just missed the Forge Event for this, please point it out to me and feel free to call me an idiot.

Edited January 15, 2018 by T.S.White
SOLVED

[jabelar]

You can always get a list of available events by looking at the Type Hierarchy for the Event class. Just make sure you open up the subclasses as well because some events have useful sub-events. It is worth going through regularly as new events are added fairly often, plus familiarity usually is helpful when you come up with new modding ideas you already know there are events to hook into.

 

I think you're right that there probably isn't an event specific to what you want. By the way, for things that might be generally interesting that you want added to Forge you can go to the github MinecraftForge project and create an Issue, or even better you can create a Pull Request that fixes the issue.

 

One thing you might be able to do is hook into the block's NeighborNotifyEvent and figure out what caused it. The worst case is just use a tick event and iterate through all the entities in the world (or using the living update event and process that entity) and see what they're standing on. You'd probably find some useful code in the Entity#move() method as it checks thing like whether it can walk on things.

Edited January 14, 2018 by jabelar

[T.S.White]

4 hours ago, jabelar said:

You can always get a list of available events by looking at the Type Hierarchy for the Event class. Just make sure you open up the subclasses as well because some events have useful sub-events. It is worth going through regularly as new events are added fairly often, plus familiarity usually is helpful when you come up with new modding ideas you already know there are events to hook into.

 

I think you're right that there probably isn't an event specific to what you want. By the way, for things that might be generally interesting that you want added to Forge you can go to the github MinecraftForge project and create an Issue, or even better you can create a Pull Request that fixes the issue.

 

One thing you might be able to do is hook into the block's NeighborNotifyEvent and figure out what caused it. The worst case is just use a tick event and iterate through all the entities in the world (or using the living update event and process that entity) and see what they're standing on. You'd probably find some useful code in the Entity#move() method as it checks thing like whether it can walk on things.

Thanks! Looking at the Type Hierarchy was really good advice. I'm still new to Java and didn't even know that existed.
And no, it doesn't look like onEntityWalk or anything similar is pre-packaged and ready to go. If I knew the language better I think I see a way I could copy and extend the Forge Hooks to use onEntityWalk, and that would probably be lighter and more elegant since it already gets called whenever you move...

For now though, it looks like I'll be using the ham-fisted approach of LivingUpdateEvent, check if it's the player (wish it was all the entities but that's a lot for this approach), and then check what the block under their feet is.

 

So, next question, how do I get from a BlockPos to knowing if that block is dirt? From (really old) tutorials, it seems like I need to go through IBlockStates? Or something? Still reading tutorials (including the one you wrote for 1.8) and documentation, but if there's a quicker or more up to date answer I'd be super happy.

Thanks again!

-T

[Draco18s]

9 minutes ago, T.S.White said:

So, next question, how do I get from a BlockPos to knowing if that block is dirt? From (really old) tutorials, it seems like I need to go through IBlockStates? Or something? Still reading tutorials (including the one you wrote for 1.8) and documentation, but if there's a quicker or more up to date answer I'd be super happy.

state = world.getBlockState(pos); //this gets you the IBlockState (Block + Metadata combination)

block = state.getBlock(); //this gets the Block (no metadata)

[T.S.White]

43 minutes ago, Draco18s said:

state = world.getBlockState(pos); //this gets you the IBlockState (Block + Metadata combination)

block = state.getBlock(); //this gets the Block (no metadata)

How/Where do I use these?

(It seems like all of my questions when learning new languages are about where I put things... I feel like a little kid playing with one of those put-the-shape-in-the-cutout toys... at least I'm having fun? )

Thanks for helping!

current, relevant, probably bad code:

Spoiler

@SubscribeEvent

public static void makePath(LivingUpdateEvent event) {

 

if (event.getEntityLiving() != null && event.getEntityLiving() instanceof EntityPlayer)

{

Entity player = event.getEntity();

BlockPos playerLocation = new BlockPos(player.posX, player.posY - player.getYOffset(), player.posZ);

 

 

if (/*Block @ playerLocation*/ instanceof BlockGrass)

{

System.out.println("Block  is Grass!");

}

}

    }

 

[Draco18s]

world = player.getWorld();

//now you have everything you need

[T.S.White]

1 hour ago, Draco18s said:

world = player.getWorld();

//now you have everything you need

YAY! Thank you so much! I totally get it now.

 

I had some other mistakes to fix, but for those interested here's some working(ish) code that makes grass turn to dirt when you walk on it:

Spoiler

@SubscribeEvent

public static void makePath(LivingUpdateEvent event) {

 

 

if (event.getEntityLiving() != null && event.getEntityLiving() instanceof EntityPlayer)

{

Entity player = event.getEntity();

BlockPos playerLocation = new BlockPos(player.posX, player.posY + player.getYOffset(), player.posZ);

World world = player.getEntityWorld();

IBlockState state = world.getBlockState(playerLocation);

Block block = state.getBlock();

 

 

if (block instanceof BlockGrass)

{

world.setBlockState(playerLocation, Blocks.DIRT.getDefaultState());

}

}

    }

 

Edited January 15, 2018 by T.S.White