Waiting for Four Seconds

[Adityagupta]

Hi Everyone,

 

I am trying to build a mod that increases the size of TNT explosions, but I can't figure out how to make the larger explosion four seconds after the TNT is lit. Currently, the bigger explosion is made right when you light the TNT. Is there anything like Bukkit's Scheduler to do this?

[shieldbug1]

You almost always have an instance of World available, and World#getCurrentWorldTime is given in ticks. Given that there are 20 ticks/second, to wait 4 seconds you want to wait 80 ticks.

[MultiMote]

You should create your own primed tnt entity and replace time there. And replace vanilla entity with your entity in EntityJoinWorldEvent.

[Adityagupta]

Neither of those work, when I make a new TNT, I can't change it's size, and there is no World.getCurrentWorldTime method.

[shieldbug1]

Sorry, my bad. World#getTotalWorldTime or World#getWorldTime.

[sequituri]

Here is an example of subclassing and overriding TNT blast sizes:

 

 

 

public class EntityBigTNTPrimed extends EntityTNTPrimed 
{
public EntityBigTNTPrimed(World w, double x, double y, double z, EntityLivingBase placer)
{
	super(w, x, y, z, placer);
	// alter 'fuse' here if different delay is wanted
}

@Override
public void onUpdate()
{
	this.prevPosX = this.posX;
	this.prevPosY = this.posY;
	this.prevPosZ = this.posZ;
	this.motionY -= 0.03999999910593033D;
	this.moveEntity(this.motionX, this.motionY, this.motionZ);
	this.motionX *= 0.9800000190734863D;
	this.motionY *= 0.9800000190734863D;
	this.motionZ *= 0.9800000190734863D;

	if (this.onGround)
	{
		this.motionX *= 0.699999988079071D;
		this.motionZ *= 0.699999988079071D;
		this.motionY *= -0.5D;
	}

	if (this.fuse-- <= 0)
	{
		this.setDead();

		if (!this.worldObj.isRemote)
		{
			this.majorlyExplode(size);
		}
	}
	else
	{
		this.worldObj.spawnParticle("smoke", this.posX, this.posY + 0.5D, this.posZ, 0.0D, 0.0D, 0.0D);
	}
}
private void majorlyExplode()
{
	float f = YOUR_BLAST_RADIUS; // this is a float normally 4.0f
	this.worldObj.createExplosion(this, this.posX, this.posY, this.posZ, f, true);
}
}

 

 

 

CAVEAT: It has not been syntax checked or tested. Use at your own risk.

[Adityagupta]

I tried the subclassing thing, but it didn't work. It just gave me a huge stacktrace which I couldn't find the top of. Also, I tried using a while loop with the World.getCurrentTime thing, but it didn't work either.

[shieldbug1]

While loops are a huge no-no in minecraft code. Ticks don't pass during the loop so they easily become infinite.

 

And when you say huge stack trace I'm just going to guess you got a StackOverflow from some loop or another.

 

You need to show us the code you used.

[Adityagupta]

I already deleted that code, but how would i use World.getCurrentTime to check if 20 ticks passed without a loop?

[shieldbug1]

You cache the time, and then compare it for the next twenty ticks.

 

 

long cachedTime = 0L;
boolean shouldRun = true;

@SubscribeEvent
public void someMethod(TickEvent.WorldTickEvent event)
{
    if(event.side == Side.SERVER && event.phase == TickEvent.Phase.START)
    {
        if(shouldRun && event.world.getTotalWorldTime() >= cachedTime + 80)
        {
            cachedTime = event.world.getTotalWorldTime();
            //DO WHATEVER
            if(someConditionThatMeansYouWantToStop)
            {
                shouldRun = false;
            }
        }
        if(someConditionThatMeansYouWantToStart)
        {
            shouldRun = true;
        }
    }
}

 

Another way to do this, if you want to run something every 4 seconds, instead of just waiting 4 seconds from a given time is using the modulo operator

 

if(world.getTotalWorldTime() % 80 == 0) //runs every 80 ticks (given that the method gets called).

[Adityagupta]

That didn't work either, it just didn't do anything.

[Mecblader]

Show code, and are you registering the event?

[Adityagupta]

I did register the event, but it still didn't do anything. Also, like I said above, I delete my code if it doesn't work.

[shieldbug1]

What do you mean it doesn't do anything? I use code like that all the time and it works fine.

 

And don't delete code that doesn't work, post it here so that we can help you!

 

We're not just going to give you copy-paste code, that's not how you learn.