A whole bunch of questions regarding vehicles

Question 1: Is it possible to have powered rails be powered without detector rail or torch?
Question 2: Can I make a command eg. /faster and it increases the minecrafts velocity in intervals
Question 3: With the event VEHICLE_COLLISION_BLOCK and VEHICLE_COLLISION_ENTITY, how do I eject a player. I tried getPassenger.

 

1. Probably not, requires native code editing, which requires replacing blocks to custom types, which means custom Material ID list, which is not possible.

2. Very hard but possible, if you handle all velocity changes somehow. If you meant Minecart there, replace the class and edit or handle onVehicleMove.

3. entity.eject(); exists for vehicles I believe.

 

Might even be not that hard. Replacing the block in the minecraft.server block array might do the job.

 

But will the client 'interpret' the new block ID being sent over? That is kinda the issue...

With entities it will simply use instanceof and interprets it as being an EntityMinecart, but I am not sure about blocks in that matter... (or you send an existing ID over, but is this possible, since chunks of blocks are sent and not individual packages for each block)

 

You won't need a new block ID since you don't create a new block. You would just override the redstone check thingy and pretend the rail would be powered. The server should do the rest for you.
The client only needs to know that the rail is powered.

Actually, powered rails have a data flag to show they are powered. So setting that without a block update should also be possible without any nasty native code replacements.
You would just need to handle block updates ...

 

If it's so easy, then how can you replace the block? The server only stores the ID and a byte worth of data for each block, and optionally extra data (tileentities). You will need a different ID of some sort so the server won't react to it as a regular powered rail...so yeah.

 

The idea that @Shamebot suggested was to replace the referenced block for powered rails in net.minecraft.server.Block with a custom modification.
So everytime the server does something with a powered rail in your world, it will find your custom Block class instead of BlockRail in the field net.minecraft.server.Block.railPowered - -with its own treatment of powering.

 

Aaah yeah that makes sense, I did know things were stored there but I tend to overlook things now and then, thanks for clearing things up.

 

Yes. BUT it turned out, that, unless the server is run with Java 1.2, we're not allowed to set static final fields (if that didn't change with 6 or 7).
Edit:
http://www.javaspecialists.eu/archive/Issue096.html

 

Yep they are final...but in the end everything is hackable. If required you could even inject custom code into memory, but that would probably be a liiiittlee too much work and a little dangerous too.

 

https://github.com/Belphemur/CustomEvent/blob/master/src/main/java/be/Balor/Poc/DynamicEnum.java#L31
:-P Suddenly I feel like trying it out

 

Now a way to replace actual class files and you could basically mod Bukkit.

 

Im starting to think this is a bit out of my experience. :/

 

Actually, that whole final-hacking replacing thingy thing isn't even necessairy if you want your powered rail stuff pretty basic. Just set the data flag for the rail to turn it on:
http://www.minecraftwiki.net/wiki/Data_values#Rails

@Shamebot
With the magic of reflect, everything seems possible

 

I hope that works, when you set the redstonewire data it just goes out instantly.

 

I guess bukkit's API is not enough for that (BLOCK_PHYSICS might do, I don't know), so you probably still need to hook CraftBukkit and net.minecraft.server classes.

 

You realise minecart mania does all of what you just said, You could just looks at its source code. No forking.. rofl

 

There's a difference between entity replacement and block replacement. Yes, you can add modifiers to the minecart velocity to keep it running, but that's too easy. If you want ACTUAL block changes, in other words, see a lit powered rail, you will need some way to inject code into the block physics code. However, there is an onBlockPhysics event, so by cancelling it you may be able to prevent the rail from changing back. (?)

It worked for portals, not sure about rails.

 

That would be stealing.

 

I didnt mean copy it i just meant to see how they did it. Its not much better then someone else supplying you code here.

 

That makes sense. Ill go wade though all those class. Let then fun begin!

 

Back to this question again, I want to eject a player when there minecart colides with a block.
I have this,

public void
onVehicleBlockCollision(VehicleBlockCollisionEvent event){ if(event.getBlock()instanceof
Entity){
Entity passenger = event.getVehicle().getPassenger();

//Vehicle v = event.getVehicle();
passenger.eject();
}
What am I doing wrong?

 

Don't you want event.getblock().getType() == whatever block you want it to break on.
Also try send the player a message just to mak sure it is getting the impact event.

 

What is that supposed to mean?

 

A block is not an entity. A vehicle, however, is an entity.

 

That means I should change it to getEntity()

 

You should check event.getVehicle() for the vehicle you want.

Ex:

if(event.getVehicle() instanceof Boat)

 

if(event.getVehicle( instanceof Boat)
But if your dealing with minecarts its
if(event.getVehicle( instanceof Minecart)
Right?

 

Correct.