Hey Guys. I making a Gui Container but I don't know how can I show the mod where the slots are. I found this:

addSlotToContainer(new Slot(tm.inventory, index++, 44 + k * 18, 17 + j * 18));

k is the height and j the weidth. I have 2 * (1*3) slots but how can I say the mod where the slots are?! And what mean the numbers (pixels?)?

The numbers, "pixels", tell minecraft where the slots are. Use a software like paint.net and see the starting point and the ending point of your slots on your gui.

The arguments for Slot are IInventory inventory, int slotId, int xPos and int yPos.

 

So, it's the last two numbers that position your slots in relation to your GUI. Judging from the math you've used there, I'm guessing you just looked at an example which utilizes a for loop.

 

For loops are great for adding multiple slots which are grouped together, so if you have two rows of 3 slots (?) you'd just use two for loops - One counts to two and adjusts the Y value, and the second counts to 3 adjusting the X. Of course, you still need to define the starting point, hence for example (44 + k * 18) - starting at 44, add on k * 18 - adding 18 for the first iteration, 36 for the second and so on.

 

It's worth noting as well (as this threw me off at first), in all the vanilla Minecraft GUI's (and therefore most mods which copy them), the slots are actually 18x18 texture-wise, there's a buffer of 1 pixel on every side. So, although the physical white-box slot is only 16x16, you need to add 18 for each space (hence the multiplication of 18 in the code you have)