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src/main/java/net/yseven/findyourway/Client/AngleGetter.java

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+package net.yseven.findyourway.Client;
+
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.entity.item.EntityItemFrame;
+import net.minecraft.item.IItemPropertyGetter;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.world.World;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
+import net.yseven.findyourway.item.ModItems;
+
+import javax.annotation.Nullable;
+import javax.annotation.ParametersAreNonnullByDefault;
+import java.util.Objects;
+
+public class AngleGetter implements IItemPropertyGetter {
+    @SideOnly(Side.CLIENT)
+    private double prevAngle = 0.0D;
+    @SideOnly(Side.CLIENT)
+    private double prevWobble = 0.0D;
+    @SideOnly(Side.CLIENT)
+    private long prevWorldTime = 0L;
+
+    double blockX;
+    double blockZ;
+
+    @Override
+    @ParametersAreNonnullByDefault
+    @SideOnly(Side.CLIENT)
+    public float apply(ItemStack stack, @Nullable World worldIn, @Nullable EntityLivingBase entityIn) {
+
+        if (entityIn == null && !stack.isOnItemFrame()) return 0.0F;
+        final boolean entityExists = entityIn != null;
+
+        final Entity entity = (Entity) (entityExists ? entityIn : stack.getItemFrame());
+
+        if (worldIn == null) worldIn = entity.world;
+
+        double rotation = entityExists ? (double) entity.rotationYaw : getFrameAngle((EntityItemFrame) entity);
+        rotation %= 360.0D;
+
+        double adjusted = Math.PI - ((rotation - 90.0D) * 0.01745329238474369D - getAngle(worldIn, entity, stack));
+
+        if (entityExists) adjusted = wobble(worldIn, adjusted);
+
+        final float f = (float) (adjusted / (Math.PI * 2D));
+        return MathHelper.positiveModulo(f,    1.0F);
+    }
+
+    @SideOnly(Side.CLIENT)
+    private double wobble(World world, double angle) {
+        long worldTime = world.getTotalWorldTime();
+        if (worldTime != prevWorldTime) {
+            prevWorldTime = worldTime;
+            double angleDifference = angle - prevAngle;
+            angleDifference = MathHelper.positiveModulo(angleDifference + 0.5D, 1.0D) - 0.5D;
+            prevWobble += angleDifference * 0.1D;
+            prevWobble *= 0.8D;
+            prevAngle = MathHelper.positiveModulo(prevAngle + prevWobble, 1.0D);
+        }
+        return prevAngle;
+    }
+
+    @SideOnly(Side.CLIENT)
+    private double getAngle(World world, Entity entity, ItemStack stack) {
+        return Math.atan2((double) blockZ - entity.posZ, (double) blockX - entity.posX);
+    }
+
+    @SideOnly(Side.CLIENT)
+    private double getFrameAngle(EntityItemFrame entity) {
+        return (double) MathHelper.wrapDegrees(180 + (entity.facingDirection.getHorizontalIndex() * 90));
+    }
+
+    @SideOnly(Side.CLIENT)
+    private double getPosToAngle(BlockPos pos, Entity entity) {
+        return Math.atan2((double)pos.getZ() - entity.posZ, (double)pos.getX() - entity.posX);
+    }
+}

src/main/java/net/yseven/findyourway/Client/ClientProxy.java

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+package net.yseven.findyourway.Client;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.entity.EntityPlayerSP;
+import net.minecraft.client.multiplayer.WorldClient;
+import net.minecraft.client.renderer.block.model.ModelResourceLocation;
+import net.minecraft.item.Item;
+import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.math.BlockPos;
+import net.minecraftforge.client.event.ModelRegistryEvent;
+import net.minecraftforge.client.model.ModelLoader;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.fml.client.FMLClientHandler;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.event.FMLInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.gameevent.TickEvent;
+import net.minecraftforge.fml.relauncher.Side;
+import net.yseven.findyourway.CommonProxy;
+import net.yseven.findyourway.FindYourWay;
+import net.yseven.findyourway.Network.PacketHandler;
+import net.yseven.findyourway.Network.PacketSendKey;
+import net.yseven.findyourway.item.ItemCompassBase;
+import net.yseven.findyourway.item.ModItems;
+
+@Mod.EventBusSubscriber(Side.CLIENT)
+public class ClientProxy extends CommonProxy {
+
+    //Get information about the player and world
+    public static Minecraft getMinecraft() {
+        return FMLClientHandler.instance().getClient();
+    }
+
+    public static WorldClient getWorld() {
+        return getMinecraft().world;
+    }
+
+    public static EntityPlayerSP getPlayer() {
+        return getMinecraft().player;
+    }
+
+    //TO-DO fill out the following methods
+    public static boolean hasCompass(ItemCompassBase compass) {
+        return getPlayer() != null && CommonProxy.containsCompass(getPlayer().inventory, compass);
+    }
+
+    public static void setStructurePos(ItemCompassBase compassBase, BlockPos pos) {
+        compassBase.setStructurePos(pos);
+    }
+
+    public static BlockPos getStructurePos(ItemCompassBase compassBase) {
+        return compassBase.getStructurePos();
+    }
+
+    public static void resetStructurePos(ItemCompassBase compass) {
+        compass.setStructurePos(null);
+        compass.setStructureWorld(getWorld());
+        PacketHandler.INSTANCE.sendToServer(new PacketSendKey(compass));
+    }
+
+    //Proxy Info
+    @Override
+    public void preInit(FMLPreInitializationEvent event) {
+        super.preInit(event);
+        MinecraftForge.EVENT_BUS.register(this);
+    }
+
+    @Override
+    public void init(FMLInitializationEvent event) {
+        super.init(event);
+    }
+
+    @Override
+    public void postInit(FMLPostInitializationEvent event) {
+        super.postInit(event);
+    }
+
+    @Override
+    public void registerItemRenderer(Item item, int meta, String id) {
+        ModelLoader.setCustomModelResourceLocation(item, meta, new ModelResourceLocation(FindYourWay.modId + ":" + id, "inventory"));
+    }
+
+    @SubscribeEvent
+    public void onModelRegistry(ModelRegistryEvent event) {
+        ModItems.ENDER_COMPASS.addPropertyOverride(new ResourceLocation(ModItems.ENDER_COMPASS.assetTag), new AngleGetter());
+        ModelLoader.setCustomModelResourceLocation(ModItems.ENDER_COMPASS, 0, new ModelResourceLocation("findyourway:ender_compass", "inventory"));
+    }
+
+    @SubscribeEvent
+    public void onClientTick(TickEvent.ClientTickEvent event) {
+        for(int i = 0; i < CommonProxy.compassList.size(); i++) {
+            if(hasCompass(CommonProxy.compassList.get(i))) {
+                if(getWorld() != CommonProxy.compassList.get(i).getStructureWorld()) {
+                    resetStructurePos(CommonProxy.compassList.get(i));
+                }
+            }
+        }
+    }
+}

src/main/java/net/yseven/findyourway/CommonProxy.java

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+package net.yseven.findyourway;
+
+import net.minecraft.inventory.IInventory;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.event.FMLInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import net.yseven.findyourway.Network.PacketHandler;
+import net.yseven.findyourway.item.ItemCompassBase;
+
+import java.util.ArrayList;
+
+@Mod.EventBusSubscriber
+public class CommonProxy {
+
+    public static ArrayList<ItemCompassBase> compassList = new ArrayList<>();
+
+    public void preInit(FMLPreInitializationEvent event) {
+        PacketHandler.registerMessages("findyourway");
+    }
+
+    public void  init(FMLInitializationEvent event) {
+
+    }
+
+    public void postInit(FMLPostInitializationEvent event) {
+
+    }
+
+    public void registerItemRenderer(Item item, int meta, String id) {
+    }
+
+    public static boolean containsCompass(IInventory inventory, ItemCompassBase compass) {
+        for(int slot = 0; slot < inventory.getSizeInventory(); slot++) {
+            ItemStack stack = inventory.getStackInSlot(slot);
+            if(!stack.isEmpty() && stack.getItem() == compass) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

src/main/java/net/yseven/findyourway/FindYourWay.java

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+package net.yseven.findyourway;
+
+
+import net.minecraft.item.Item;
+import net.minecraftforge.client.event.ModelRegistryEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.RegistryEvent;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.SidedProxy;
+import net.minecraftforge.fml.common.event.FMLInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.network.NetworkRegistry;
+import net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper;
+import net.minecraftforge.fml.relauncher.Side;
+import net.yseven.findyourway.Network.PacketSendKey;
+import net.yseven.findyourway.item.ModItems;
+
+@Mod(modid = FindYourWay.modId, name = FindYourWay.name, version = FindYourWay.version)
+public class FindYourWay {
+    public static final String modId = "findyourway";
+    public static final String name = "Find Your Way";
+    public static final String version = "1.0.0-beta";
+
+    @Mod.Instance(modId)
+    public static FindYourWay instance;
+
+    @SidedProxy(serverSide = "net.yseven.findyourway.CommonProxy", clientSide = "net.yseven.findyourway.Client.ClientProxy")
+    public static CommonProxy proxy;
+    public static SimpleNetworkWrapper network;
+
+    @Mod.EventHandler
+    public void preInit(FMLPreInitializationEvent event) {
+        System.out.println(name + " is loading!");
+
+        proxy.preInit(event);
+    }
+
+    @Mod.EventHandler
+    public void init(FMLInitializationEvent event) {
+        proxy.init(event);
+    }
+
+    @Mod.EventHandler
+    public void postInit(FMLPostInitializationEvent event) {
+        proxy.postInit(event);
+    }
+
+    @Mod.EventBusSubscriber
+    public static class RegistrationHandler {
+        @SubscribeEvent
+        public static void registerItems(RegistryEvent.Register<Item> event) {
+            ModItems.register(event.getRegistry());
+        }
+
+        @SubscribeEvent
+        public static void registerModels(ModelRegistryEvent event) {
+            ModItems.registerModels();
+        }
+    }
+}

src/main/java/net/yseven/findyourway/Network/PacketGetKey.java

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+package net.yseven.findyourway.Network;
+
+import io.netty.buffer.ByteBuf;
+import net.minecraft.util.math.BlockPos;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
+import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;
+import net.yseven.findyourway.Client.ClientProxy;
+import net.yseven.findyourway.item.ItemCompassBase;
+
+public class PacketGetKey implements IMessage, IMessageHandler<PacketGetKey, IMessage> {
+    private BlockPos structurePos;
+    private ItemCompassBase compass;
+
+    public PacketGetKey() {}
+
+    public PacketGetKey(BlockPos pos, ItemCompassBase compassBase) {
+        structurePos = pos;
+        compass = compassBase;
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        buf.writeLong(structurePos.toLong());
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        structurePos = BlockPos.fromLong(buf.readLong());
+    }
+
+    @Override
+    public IMessage onMessage(PacketGetKey message, MessageContext ctx) {
+        //Client Code
+        ClientProxy.getMinecraft().addScheduledTask(() -> ClientProxy.setStructurePos(message.compass, message.structurePos));
+        return null;
+    }
+}

src/main/java/net/yseven/findyourway/Network/PacketHandler.java

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+package net.yseven.findyourway.Network;
+
+import net.minecraftforge.fml.common.network.NetworkRegistry;
+import net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper;
+import net.minecraftforge.fml.relauncher.Side;
+
+@SuppressWarnings("WeakerAccess")
+public class PacketHandler {
+    private static int packetId = 0;
+
+    public static SimpleNetworkWrapper INSTANCE = null;
+
+    public PacketHandler() {
+    }
+
+    public static int nextID() {
+        return packetId++;
+    }
+
+    public static void registerMessages(String channelName) {
+        INSTANCE = NetworkRegistry.INSTANCE.newSimpleChannel(channelName);
+        registerMessages();
+    }
+
+    public static void registerMessages() {
+        // Register messages which are sent from the client to the server here:
+        INSTANCE.registerMessage(PacketSendKey.Handler.class, PacketSendKey.class, nextID(), Side.SERVER);
+        INSTANCE.registerMessage(PacketGetKey.class, PacketGetKey.class, nextID(), Side.CLIENT);
+    }
+}

src/main/java/net/yseven/findyourway/Network/PacketSendKey.java

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+package net.yseven.findyourway.Network;
+
+import io.netty.buffer.ByteBuf;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.WorldServer;
+import net.minecraftforge.fml.common.FMLCommonHandler;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
+import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;
+import net.yseven.findyourway.item.ItemCompassBase;
+
+public class PacketSendKey implements IMessage {
+    private BlockPos structurePos;
+    private final ItemCompassBase compass;
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        structurePos = BlockPos.fromLong(buf.readLong());
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        buf.writeLong(structurePos.toLong());
+    }
+
+    public PacketSendKey(ItemCompassBase compassBase) {
+        compass = compassBase;
+    }
+
+    public static class Handler implements IMessageHandler<PacketSendKey, IMessage> {
+        @Override
+        public IMessage onMessage(PacketSendKey message, MessageContext ctx) {
+            FMLCommonHandler.instance().getWorldThread(ctx.netHandler).addScheduledTask(() -> handle(message, ctx));
+            return null;
+        }
+
+        private void handle(PacketSendKey message, MessageContext ctx) {
+            //server code
+            EntityPlayerMP player = ctx.getServerHandler().player;
+            WorldServer world = (WorldServer) player.world;
+            if (message.compass != null) {
+                message.structurePos = world.getChunkProvider().getNearestStructurePos(world, message.compass.getStructureType(), new BlockPos(player), false);
+                if (message.structurePos != null) {
+                    PacketHandler.INSTANCE.sendTo(message, player);
+                }
+            }
+        }
+    }
+}

src/main/java/net/yseven/findyourway/Util.java

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+package net.yseven.findyourway;
+
+import net.minecraft.entity.player.InventoryPlayer;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+
+public class Util {
+    public static boolean checkInventoryForCompass(InventoryPlayer inventory, Item compass) {
+        for(int x = 0; x < inventory.getSizeInventory(); x++) {
+            ItemStack stack = inventory.getStackInSlot(x);
+            if(!stack.isEmpty() && stack.getItem() == compass) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

src/main/java/net/yseven/findyourway/item/ItemCompassBase.java

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+package net.yseven.findyourway.item;
+
+import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.EnumActionResult;
+import net.minecraft.util.EnumHand;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import net.yseven.findyourway.Client.ClientProxy;
+import net.yseven.findyourway.CommonProxy;
+import net.yseven.findyourway.FindYourWay;
+
+import javax.annotation.Nonnull;
+
+public class ItemCompassBase extends Item {
+    private final String structureType;
+    private BlockPos structurePos;
+    private World structureWorld;
+    public final String assetTag;
+
+    ItemCompassBase(String name, String structureType, CreativeTabs tab) {
+        this.setUnlocalizedName(name);
+        this.setRegistryName(name);
+        this.structureType = structureType;
+        this.setCreativeTab(tab);
+        this.setMaxStackSize(1);
+        this.assetTag = name + "_angle";
+        CommonProxy.compassList.add(this);
+    }
+
+    public String getStructureType() {
+        return structureType;
+    }
+
+    public void setStructurePos(BlockPos pos) {
+        structurePos = pos;
+    }
+
+    public BlockPos getStructurePos() {
+        return structurePos;
+    }
+
+    public void setStructureWorld(World world) {
+        structureWorld = world;
+    }
+
+    public World getStructureWorld() {
+        return structureWorld;
+    }
+
+    public void registerItemModel() {
+        FindYourWay.proxy.registerItemRenderer(this, 0, this.getUnlocalizedName());
+    }
+
+    @Override
+    public ActionResult<ItemStack> onItemRightClick(World world, EntityPlayer player, @Nonnull EnumHand hand) {
+        if (world.isRemote) {
+            ClientProxy.resetStructurePos(this);
+        }
+        return new ActionResult<>(EnumActionResult.SUCCESS, player.getHeldItem(hand));
+    }
+}

src/main/java/net/yseven/findyourway/item/ModItems.java

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+package net.yseven.findyourway.item;
+
+import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.item.Item;
+import net.minecraftforge.registries.IForgeRegistry;
+
+public class ModItems {
+
+    public static ItemCompassBase ENDER_COMPASS = new ItemCompassBase("ender_compass", "Stronghold", CreativeTabs.TOOLS);
+
+    public static void register(IForgeRegistry<Item> registry) {
+        registry.registerAll(
+                ENDER_COMPASS
+        );
+    }
+
+    public static void registerModels() {
+        ENDER_COMPASS.registerItemModel();
+    }
+}