Jump to content

[1.7.10][1.8] Creating filled_map items pre-populated with data - How?


sshipway

Recommended Posts

So, I'm trying to create a new

filled_map

item, preloaded with data (it is converted from an external image file).

 

I have already created the code to convert my chosen image to an

NBTCompoundTag

corresponding to the Map Data.

 

I can obtain a new, unique mapID, and write the NBT file to the correct data/map_#.dat location:

		mapNo = (short) world.getUniqueDataId("map");

	String folderName = MinecraftServer.getServer().getFolderName();
	ISaveFormat saveFormat = MinecraftServer.getServer().getActiveAnvilConverter();
	SaveHandler saveHandler = (SaveHandler)saveFormat.getSaveLoader(folderName, false); 
	String worldsavedir = saveHandler.getWorldDirectory().getPath();
	mapFilename = worldsavedir + File.separator + "data" + File.separator + "map_" + mapNo + ".dat";
	CompressedStreamTools.writeCompressed(map,new FileOutputStream(mapFilename));

 

This then allows me to make an object in the game, should I wish:

mapItemStack = new ItemStack(Items.filled_map,1,mapNo);

 

The new object appears in the game, has the correct contents, and seems happy.

 

The problem is that, when I try to save the world, Minecraft complains that the world has been modified by something else -- the cause is the writing of the

map_#.dat

file, which must break some save-time integrity test.  It is valid NBT (because exiting Minecraft and restarting allows things to work) but clearly, I should be using some internal function to write the new map out, not the CompressedStreamTools.

 

I can create a MapData object like this:

		md = new MapData("map"); // what is the parameter for?
	md.readFromNBT(map);

 

However, I cannot identify how to write this and obtain the unique DataId.  There is a MapStorage class, and an ItemMap class, but I cannot work out how to link the MapData to these, obtain a unique ID, and force a save.

 

I can possibly do this:

		im = Items.filled_map;
	im.updateMapData(world, entity, md);

 

... but it is unclear what the 'entity' refers to, and again there seems to be no way to specify the mapNumber.  Conversely, the MapStorage class allows me to make a new mapNumber and apparently to save the maps, but I have no way to assign the MapData object to the new mapNumber.

 

Any help and pointers on this would be appreciated.  I feel like I'm so close, but blocked by a lack of documentation...

 

Steve

Link to comment
Share on other sites

You'll have to excuse the obfuscated code.  This is out of an old, old project (1.6.4 actually) and I never refactored the variable names.

 

ItemMyEmptyMap.java

public ItemStack onItemRightClick(ItemStack par1ItemStack, World par2World, EntityPlayer par3EntityPlayer) {
//the string here is the key in a key->value relationship in a HashMap.  Really you can use whatever.
//the item stack here is important, as this converts the item from the empty map to the filled map.
        ItemStack itemstack1 = new ItemStack(MapsBase.OreMapItem, 1, par2World.getUniqueDataId("map"));
//get a unique name
        String s = "map_" + itemstack1.getItemDamage();
        MapData mapdata = new MapData(s);
//this line maps the specific map to its data for save/load
        par2World.setItemData(s, mapdata);

//boring stuff
        mapdata.scale = 1;
        int i = 128 * (1 << mapdata.scale);
        mapdata.xCenter = (int)(Math.round(par3EntityPlayer.posX / (double)i) * (long)i);
        mapdata.zCenter = (int)(Math.round(par3EntityPlayer.posZ / (double)i) * (long)i);
        mapdata.dimension = (byte)par2World.provider.dimensionId;
        mapdata.markDirty();
        --par1ItemStack.stackSize;
        itemstack1.setItemName("Ore Density Map ("+mapdata.xCenter+","+mapdata.zCenter+")");
        if (par1ItemStack.stackSize <= 0)
        {
            return itemstack1;
        }
        else
        {
            if (!par3EntityPlayer.inventory.addItemStackToInventory(itemstack1.copy()))
            {
                par3EntityPlayer.dropPlayerItem(itemstack1);
            }

            return par1ItemStack;
        }
    }

 

ItemMyFilledMap.java

@Override
public void updateMapData(World world, Entity player, MapData mapData) {
short short1 = 128;
//this line is likely the most important one for you
//the MapInfo object is what contains the actual pixel data displayed
MapInfo mapinfo = mapData.func_82568_a((EntityPlayer)player);
//loop, blah blah
for(x) {
	for(z) {
		int colorIndex = /*some color*/
		mapData.colors[x + z * short1] = colorIndex;
	}
}
}

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Link to comment
Share on other sites

Many thanks!  The mystery was the correct usage of the MapData object.  Although I had managed to avoid the error in the previous code by writing the NBT file and then setting the last modification time into the past, that solution was... suboptimal ;)

 

The function now all works, and I can generate framed-map 'pictures' in-game from external image files on the fly.

 

	public static short createMap(World world, String imgFilename , Logger logger ) {
	short mapNo;
	String mapFilename;
	NBTTagCompound map;
	MapData data;

	// build map object NBT
	map = imgToNBT(imgFilename,logger);
	if( map == null ) { return -1; } // unable to convert

	// get a new unique ID for the new map
	mapNo = (short) world.getUniqueDataId("map");

	// save the data
	data = new MapData("map_"+mapNo); 
	data.readFromNBT(map);
	world.setItemData("map_"+mapNo,data);

	return mapNo;
}

Link to comment
Share on other sites

Many thanks!  The mystery was the correct usage of the MapData object.

 

Heh.  I only remember that I chewed on it back in 1.6.4, I remember almost nothing other than what I was able to glean from my code. :P

I did some pretty neat shit, though. :D  Thinking about using the ore map with this custom data block I have (er, data object, it's not a

Block

).  It'd be harder to get data into the map (using the existing prospecting method) but would have a little more permanence.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Link to comment
Share on other sites

While the method above works in 1.8, it seems that in 1.7 things are somewhat different.  The code will create the object in-game, but the 'map' picture displays progressively, column by column.

 

The worse part is that the map_#.dat NBT file is not written on save (though the idcounts ARE updated) and when the game is restarted, the 'map' is now a basic 0,0 blank map.

 

Clearly, under 1.7, there is something else that needs to be done in order to add the map data to the world.    Writing the map_#.dat NBT file myself only results in the previously mentioned "the world has been modified by something else" error, even if I try the trick of setting the file last modification time.

 

The other problems, of ItemFrame being an entity and its Tile* attributes being different under 1.7 and 1.8 have been solved, and that's behaving, at least...

 

V1.8 seem to me to be far easier to code for, and far more forgiving of missing or invalid data.  They seem to have coded with the expectation of mods being created.

Link to comment
Share on other sites

Aha!  It seems that, in Minceraft 1.7, the

data.markDirty()

call is essential -- this is what causes the initial NBT file to be written.  In Minecraft 1.8, it happens implicitly.

 

I've added this call immediately after

world.setItemData

call, and now my code also works in 1.7.10.

 

Thanks for the help -- I've posted here for the benefit of any future readers with a similar problem.

Link to comment
Share on other sites

While the method above works in 1.8, it seems that in 1.7 things are somewhat different.  The code will create the object in-game, but the 'map' picture displays progressively, column by column.

 

On this, you can change that, but I wouldn't bother.  I think there's a piece that makes it so that it uses less network data, but I don't recall exactly.

I don't remember what bits to fiddle with to do it, but I did make it update slower than normal (for one of my maps).  It might be the

mapData.setColumnDirty(...)

function.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



  • Recently Browsing

    • No registered users viewing this page.
  • Posts

    • Hello, I don't have much experience with forge but I have some java knowledge, I want to add a button that says "Explore New Packs" to the Pause Screen that opens when we enter a world in the game and press the "esc" button, but I couldn't understand it (or I don't know how to use it), although I did research from artificial intelligence or different places. I was told that I can do it using mixins but I have no idea how to do it, can you explain step by step
    • We need the crash report or debug.log, as explained in the FAQ
    • i have the decocraft mod and i can see all of them. i can click right click and place the items but as soon as i put it down it disappears. im so sad it doesnt work and i dont know how to fix it. i used cursed forge to launch minecraft as well.
    • Me and my friend wanted to make a custom mod pack hosted on aternos. I downloaded the same mods as the server then started the server and my minecraft and I joined the server without issues. Then I sent the mods to my friend compressed in a zip folder (i don’t know if that has anything to do with the issue). He unpacked it put it in his mod folder and started it but couldn't join the server and got this issue:   internal exception: java.lang.runtimeexception: server not initialized yet! call IMDLib.entityHandler (modid)   Also we are using curseforge launcher to manage the mods on client side. But as I said it works on my side but not with my friend, that’s why it doesn’t make sense   Mod list:   xplosives-1.2.0.jar whisperwoods-1.18.2-2.1.0-forge.jar waystones-forge-1.18.2-10.2.2.jar voicechat-forge-1.18.2-2.4.32.jar trashslot-forge-1.18.2-11.0.3.jar towns_and_towers_forge-1.10.0.1+1.18.2.jar torchmaster-18.2.1.jar ToolBelt-1.18.2-1.18.9.jar toms_storage-1.18.2-1.4.4.jar swingthroughgrass-1.18.2-1.9.1.jar strictly_origins_v5.1_1.18.2.jar starlight-1.0.2+forge.546ae87.jar SpartanWeaponry-1.18.2-3.0.4.jar SimpleQuarry-1.18.2-18.2.5.jar simpleplanes-1.18.2-5.2.2.jar secretrooms-1.18.2-1.1.5.jar right-click-harvest-3.2.0+1.18.2-forge.jar REIPluginCompatibilities-forge-8.0.89.jar RoughlyEnough|tems-8.3.681-forge.jar RegionsUnexploredForge-0.4.1_1+1.18.2.jar TerraBlender-forge-1.18.2-1.2.0.126.jar Recall_Potion_v1.0.3-1.18.2.jar Quark-3.2-358.jar PickleTweaks-1.18.2-6.1.2.jar Pehkui-3.7.11+1.18.2-forge.jar Origins-1.18.2-1.4.1.4-unified.jar naturalist-forge-1.1.1-1.18.2.jar mysticaloaktree-1.18.2-1.2.jar selene-1.18.2-1.17.14.jar MysticalAgradditions-1.18.2-5.1.4.jar MysticalAgriculture-1.18.2-5.1.5.jar MultiMine-1.18.7.jar moyai-1.18.2-1.1.4.jar ModernDynamicSurroundings-5.0.0.4.jar lootbeams-1.18.1-release-july1722.jar journeymap-1.18.2-5.9.7-forge.jar ironfurnaces-1.18.2-3.3.3.jar ironchest-1.18.2-13.2.11.jar industrial-foregoing-1.18.2-3.3.1.6-10.jar titanium-1.18.2-3.5.11-45.jar immersive_armors-1.5.6+1.18.2-forge.jar hardcorerevival-forge-1.18.2-8.0.1.jar HammerLib-1.18.2-18.2.16. jar gravestone-1.18.2-1.0.1.jar geckolib-forge-1.18-3.0.57.jar findme-3.0.6-forge.jar faithfulbackrooms3.0.0.7.jar elevatorid-1.18.2-1.8.4.jar EasyMagic-v3.3.0-1.18.2-Forge.jar PuzzlesLib-v3.5.9-1.18.2-Forge.jar easy_villagers-1.18.2-1.0.11.jar easy_mob_farm_1.18.2-7.1.0.jar DynamicTrees-1.18.2-1.0.4.jar dragonseeker-1.1.1-1.18.2.jar iceandfire-2.1.12-1.18.2.jar Cucumber-1.18.2-5.1.5 jar cloth-config-6.5.116-forge.jar citadel-1.11.3-1.18.2.jar chunkloaders-1.2.8a-forge-mc1.18.jar supermartijn642configlib-1.1.8-forge-mc1.18.jar supermartijn642corelib-1.1.17-forge-mc1.18.jar cave_dweller-1.18.2-1.6.4.jar carryon-1.18.2-1.17.1.12.jar caelus-forge-1.18.1-3.0.0.2.jar BotanyTrees-Forge-1.18.2-4.0.13.jar BotanyPots-Forge-1.18.2-8.1.29.jar Bookshelf-Forge-1.18.2-13.3.56.jar balm-3.2.6.jar AutoRegLib-1.7-53.jar ars_nouveau-1.18.2-2.9.0.jar curios-forge-1.18.2-5.0.9.2.jar Patchouli-1.18.2-71.1.jar architectury-4.12.94-forge.jar almostunified-forge-1.18.2-0.3.10.jar [1.18.2] SecurityCraft v1.9.8.jar
  • Topics

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.