How would i go about making my own bonemeal type item? as in an item that acts like bonemeal but is not bonemeal, the problems i have been having with doing this myself is that the original bonemeal is not a normal item, ie it is a metadata item and i don't know how to use the same code from that class without the metadata. I would like my new bonemeal to work exactly the same as bonemeal itself (all the old uses, saplings, wheat, stems , etc).

all i have atm is a basic class file.

If you have and Item, then override the OnUse method.

By using that you get the location(world, x,y,z) of the block targeted along with infromation about the player etc. From that you can find out the type of block targeted by the xyz. And then you can do whatever you want to happen with it

 

If you look at ItemDye you see the Bonemeal code inside the OnUse method, it's kinda hard to see what is for the bonemeal and not when it's 15 items inn one, but if you look here:

http://www.minecraftwiki.net/wiki/Data_values#Dyes

 

You can see that the damage value for Bonemeal is 15.

So then you know that everything within this if statment's block is for the bonemeal:

if (par1ItemStack.getItemDamage() == 15)