This is a mockup of my idea: http://imgur.com/a/VJPNA. It's automatic villager trading mod that simulates player's trading. Is it possible to do this in a way it would be useable also on vanilla servers? Trade with villager until it's locked, close UI, look away for few seconds, look back, trade again... Trade order would be determined in UI, check the pictures. If you have any feedback, feel free to voice it.

 

I've already installed Eclipse and created sample mod, where would I go from there? I can code but I find Forge docs ... lacking? It explains 1.7 to 1.8 transition but almost nothing other than that. All tutorials I found are mostly targeted for beginners.

 

And last question. What causes lag with XP farms? Pure amount of entities, mobs colliding and being forced to stay in one block or their pathfinding (fucked again because they are in one block)? I'm talking about client lag (FPS dropping), not necessarily server lag. If it is possible to reduce lag, I would also like to write 2nd mod that would address this issue.

What do you mean automatic? Are you going to make a new block that opens a Gui and allows players to select possible villager trades? Or is the block going to be placed next to a villager and it will access that inventory to deal with trades?

Nothing of that sort, it's should also work on vanilla servers. You could also call it a hack as it will allow automatic trading... Right now I can do semi-automatic trading with autohotkey script but I wish to replace this with a mod. There will be no block or item, just two buttons added to vanilla villager screen. First one will start trading, 2nd one is for settings (trade orders and such).

You would have to override when the player right clicks on the Villager and display a new gui/container which you can't do on a vanilla server.

Actually you may be able to subscribe to a ClientTickEvent and check if the players currentScreen is the villager one and if so replace it. Though client tick event could cause lag.

You know there is a

PlayerContainerEvent

that is fired whenever the player opens (or closes) a gui related to a container (of which the GuiMerchant is) as well as the

GuiOpenEvent

when ever the player....opens a gui (which the GuiMerchant is).

You know there is a

PlayerContainerEvent

that is fired whenever the player opens (or closes) a gui related to a container (of which the GuiMerchant is) as well as the

GuiOpenEvent

when ever the player....opens a gui (which the GuiMerchant is).

Actually I did not though I makes sense that there is those sound mighty useful, though I have never had to do anything like that before. But is it possible to register GuiOpenEvent only client side and have it work?

You know there is a

PlayerContainerEvent

that is fired whenever the player opens (or closes) a gui related to a container (of which the GuiMerchant is) as well as the

GuiOpenEvent

when ever the player....opens a gui (which the GuiMerchant is).

Actually I did not though I makes sense that there is those sound mighty useful, though I have never had to do anything like that before. But is it possible to register GuiOpenEvent only client side and have it work?

Yes, any eventhandler can be registered on both sides or just one. The subscribed events do have to be fired on that particular side of course.

Yes, any eventhandler can be registered on both sides or just one. The subscribed events do have to be fired on that particular side of course.

Alright I have never made an only server side mod or a client side mod before good to know.

Great, I'll take a look at events you are describing. How would I go about overlaying these 2 buttons on top of vanilla GUI?

You wouldn't be overlaying you would be creating a new Gui in general, the easiest way would be to extend GuiMerchant and in init add Buttons.

Great, I've been trying to get it working but I can't. Removing all unused or irrelevant code:

 

public class GuiAutoMerchant extends GuiMerchant {

GuiButton buttonStart;

public GuiAutoMerchant(InventoryPlayer inventory, IMerchant merchant, World worldIn) {
	super(inventory, merchant, worldIn);
	// TODO Auto-generated constructor stub

	this.buttonList.add(this.buttonOptions = new GuiButton(0, 100, 100, 200, 200, "Options"));

}

@Override
protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY) {
	// TODO Auto-generated method stub
	super.drawGuiContainerBackgroundLayer(partialTicks, mouseX, mouseY);

	System.out.println("Drawing default merchant GUI");
}

}

 

But my button doesn't show up. I opted to draw default Villager GUI but even with custom background GUI, button wasn't displayed. What am I missing?

Apparently, I have to add buttons in initGui instead of constructor:

 

	@Override
public void initGui() {
	// TODO Auto-generated method stub
	super.initGui();

	this.buttonList.add(this.buttonStart = new MerchantButton(0, guiLeft + xSize - 28, guiTop + 45, MerchantButton.textureStart));
	this.buttonList.add(this.buttonOptions = new MerchantButton(0, guiLeft + xSize - 28, guiTop + 61, MerchantButton.textureOptions));
}

 

Yes. Yes you do.