My goal is to have something like a tablet computer in minecraft. Similar as the map (http://minecraft.gamepedia.com/Map) it should change its texture dynamically. The screen should show information like found in the debug screen [F3]. (Yes, it would be superfluous, but much more pretty in my opinion.)

 

By way of illustration:

https://dl.dropboxusercontent.com/u/43694603/tablet.png

 

How can i bring ever-changing content (text...) on an item's texture?

Poke around in the Vanilla map code.  You should be able to access it via Eclipse.  Or look at the Lexica Botania: https://github.com/Vazkii/Botania

Thank you. But trawling through unexplained foreign code can get very tedious..

 

Does somebody maybe know any related tutorial?

I doubt you will find a step-by-step tutorial

 

What you need is in MapItemRenderer:

DynamicTexture created, returns an int [] which is then overwritten directly by the RGB data.  Bind Dynamic texture when rendering.

 

 

-TGG

 

 

Ok thank you very much! You seem to know how that works, but that was a really short explaination .

 

The only way adding item textures that i know is

    new Item().setTextureName("ID:Name").

 

How is MapItemRenderer to be used, when i have an Item object and nothing else?

 

Furthermore i actually only need *text*, that is updated in certain time intervals and write it onto that texture. Realizing that using a RGB array might be overkill..

 

Is there maybe a more specific method?

Ok thank you very much! You seem to know how that works,

:-P well to be honest actually I'm just figuring this out as I go, plus a bit of background knowledge

 

but that was a really short explaination .

I wouldn't want to rob you of the satisfaction of a thrilling voyage of discovery

 

For me, a lot of the fun of programming minecraft is trying to pick my way through this incomprehensible swamp of vanilla code until it finally goes 'click' in my head and I understand how it works.  I think it's a very important skill for anyone who's going to try something more complicated than a new Block and a couple of recipes...

 

Furthermore i actually only need *text*, that is updated in certain time intervals and write it onto that texture. Realizing that using a RGB array might be overkill..

 

Is there maybe a more specific method?

If you just need text, that's relatively simple; you could try looking into the FontRenderer.  It's scattered all throughout the vanilla code, for example the debug screen in Minecraft.displayDebugInfo; or the number of items in an itemstack in RenderItem.renderItemOverlayIntoGUI()

 

-TGG

 

 

 

Now i'm stuck because i can not find a Forge Event that is fired when the player selects an item in the hotbar . Going through net.minecraftforge.event.* it seems like such an event doesn't exist.

 

Can somebody help, maybe describing a workaround for my intention?

Use ClientTick Event and check if the player holds your item. Then call the method you want.

 

I think it is

Minecraft.getMinecraft().thePlayer.getItemInUse();