I'm messing around with command blocks, and I'm wanting to try and make an XP vending machine. My idea is if you click a button with a Diamond in your hand, 1 diamond gets removed and you get x amount of XP.
Is this possible using command blocks? If so, what commands would I need to look at? I already know /xp myAmount @p, it's just the checking/removing of items I can't seem to get.
4 Answers
Try this, By using /clear, you can scan people for items. If you want to remove certain items, use
/clear @p(or <playername>) <itemid> For example, on a server that doesn't want griefing you could have a clock connected to a command block set to /clear @p minecraft:flint_and_steel, you can also specify how much of an item to remover by doing /clear @p minecraft:flint_and_steel 3, this would clear three Flint and Steel.
I'm a little late to this, but this is what I've had work for me: In Minecraft 1.8+ we have the /testfor command, you can use this to scan the players Inventory slots (all of them, or specific) for items:
example: diamond
/testfor @p {Inventory:[{id:"minecraft:diamond"}]} to test for an exact amount of the required item include:
,Count:#b within the confines of the "id" brackets
however, this will only search for players with a stack of the exact number you select, anything more or less will not fit the criteria; so for this application it's not useful.
For your vending machine to work properly I would recommend having this command in a clock nearby that tests for players in a specific range, so the finished command would look something like this:
/testfor @p[x,y,z,r=2] {Inventory:[{id:"minecraft:diamond"}]} (xyz are directly in front of the button)
have this connected to an output command block with a setblock command:
/setblock # # # unpowered_repeater dv for output direction needed from button
with a redstone dust on top connecting to a torch that powers this command:
/setblock # # # air to clear the space if the criteria isn't met
then your repeater needs to be touching these commands:
/clear @p diamond 0 3 /xp amount @p Image:
There are different variations you can have for the setblock changer, this is only a simple version for proof of concept.
You will need 1 Button, 3 Command Blocks, and 1 Redstone Comparator.
First Command Block:
/clear @p minecraft:diamond 0 1 a comparator above the first CB and to 2 new CB.
Second Command Block:
/xp <NumberXp> @p last Command Block:
/fill X Y Z X Y Z minecraft:command_block 0 replace {Command:"/clear @p minecraft:diamond 0 1"}
(The position XYZ is position of first CB, the shame position in the command. X=X)
Make an AND gate with as A the button and as B a very fast clock connected to a command block with
testfor @p {Invertory:[{id:"minecraft:diamond"}]} and as output
clear @p minecraft:diamond 1 and xp (amount of XP) @p I haven't tried it, but it must be something like this. This also works if you are not holding the diamond but just have it in your inventory.
