Making a ghast shoot a custom fireball

How can I make a ghast shoot a custom fireball that I made, I am willing to use NMS and I tried to make a class, I came up with this:

Code:

public class CGhast extends EntityGhast {
public CGhast(World w){
super(w);
}
Entity target;
int explosionPower = 1;
int br = 0;
protected void bq()
{
if ((!this.world.isStatic) && (this.world.difficulty == EnumDifficulty.PEACEFUL)) {
die();
}
w();
this.bo = this.bp;
double d0 = this.i - this.locX;
double d1 = this.bm - this.locY;
double d2 = this.bn - this.locZ;
double d3 = d0 * d0 + d1 * d1 + d2 * d2;
if ((d3 < 1.0D) || (d3 > 3600.0D))
{
this.i = (this.locX + (this.random.nextFloat() * 2.0F - 1.0F) * 16.0F);
this.bm = (this.locY + (this.random.nextFloat() * 2.0F - 1.0F) * 16.0F);
this.bn = (this.locZ + (this.random.nextFloat() * 2.0F - 1.0F) * 16.0F);
}
if (this.h-- <= 0)
{
this.h += this.random.nextInt(5) + 2;
d3 = MathHelper.sqrt(d3);
if (a(this.i, this.bm, this.bn, d3))
{
this.motX += d0 / d3 * 0.1D;
this.motY += d1 / d3 * 0.1D;
this.motZ += d2 / d3 * 0.1D;
}
else{
this.i = this.locX;
this.bm = this.locY;
this.bn = this.locZ;
}
}
if ((this.target != null) && (this.target.dead))
{
EntityTargetEvent event = new EntityTargetEvent(getBukkitEntity(), null, EntityTargetEvent.TargetReason.TARGET_DIED);
this.world.getServer().getPluginManager().callEvent(event);
if (!event.isCancelled()) {
if (event.getTarget() == null) {
this.target = null;
} else {
this.target = ((CraftEntity)event.getTarget()).getHandle();
}
}
}
if ((this.target == null) || (this.br-- <= 0))
{
Entity target = this.world.findNearbyVulnerablePlayer(this, 100.0D);
if (target != null)
{
EntityTargetEvent event = new EntityTargetEvent(getBukkitEntity(), target.getBukkitEntity(), EntityTargetEvent.TargetReason.CLOSEST_PLAYER);
this.world.getServer().getPluginManager().callEvent(event);
if (!event.isCancelled()) {
if (event.getTarget() == null) {
this.target = null;
} else {
this.target = ((CraftEntity)event.getTarget()).getHandle();
}
}
}
if (this.target != null) {
this.br = 20;
}
}
double d4 = 64.0D;
if ((this.target != null) && (this.target.f(this) < d4 * d4))
{
double d5 = this.target.locX - this.locX;
double d6 = this.target.boundingBox.b + this.target.length / 2.0F - (this.locY + this.length / 2.0F);
double d7 = this.target.locZ - this.locZ;

this.aM = (this.yaw = -(float)Math.atan2(d5, d7) * 180.0F / 3.1415927F);
if (hasLineOfSight(this.target))
{
if (this.bp == 10) {
this.world.a((EntityHuman)null, 1007, (int)this.locX, (int)this.locY, (int)this.locZ, 0);
}
this.bp += 1;
if (this.bp == 20)
{
this.world.a((EntityHuman)null, 1008, (int)this.locX, (int)this.locY, (int)this.locZ, 0);
//CHANGED HERE
CFireball entitylargefireball = new CFireball(this.world);


entitylargefireball.bukkitYield = (entitylargefireball.yield = this.explosionPower);
double d8 = 4.0D;
Vec3D vec3d = j(1.0F);

entitylargefireball.locX = (this.locX + vec3d.a * d8);
entitylargefireball.locY = (this.locY + this.length / 2.0F + 0.5D);
entitylargefireball.locZ = (this.locZ + vec3d.c * d8);
this.world.addEntity(entitylargefireball);
this.bp = -40;
}
}
else if (this.bp > 0)
{
this.bp -= 1;
}
}
else{
this.aM = (this.yaw = -(float)Math.atan2(this.motX, this.motZ) * 180.0F / 3.1415927F);
if (this.bp > 0) {
this.bp -= 1;
}
}
if (!this.world.isStatic)
{
byte b0 = this.datawatcher.getByte(16);
byte b1 = (byte)(this.bp > 10 ? 1 : 0);
if (b0 != b1) {
this.datawatcher.watch(16, Byte.valueOf(b1));
}
}
}

}

But because NMS has some privates in between I got all sorts of errors.
Any help would be apreciated.

 

@nuno1212sss use reflection! =)

 

@mine-care Hmm, how would I do that? Not sure on what kind of reflection you are talking about...

@mine-care Nvm, I remembered, Will post a finished class when I'm done

@mine-care Would something like this work? http://pastebin.com/QvTUshmK
Note: I am getting an error on line 55, the method a() returns a NBTTagList, yet it is like that in the ghast class.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@nuno1212sss Isn't it possible to just replace the fireball with bukkit? I mean, no need to use NMS

 

Isn't is easier to just to set up an event that on a FireBall spawns, spawn the CustomFireball and just take the data and put it towards your custom fireball? You may need to add a variable to your CustomFireball to make sure its not a unbreakable loop, but that can be done by adding a datatag to it.

 

@Zombie_Striker EntitySpawn isn't called when a ghast shoots a fireball

 

@nuno1212sss ProjectileLaunchEvent