変更

src/main/java/com/github/ptom76/tutorialfabricmod/TutorialFabricMod.java

@@ -1,6 +1,7 @@
 package com.github.ptom76.tutorialfabricmod;
 
 import com.github.ptom76.tutorialfabricmod.block.Blocks;
+import com.github.ptom76.tutorialfabricmod.enchantment.Enchantments;
 import com.github.ptom76.tutorialfabricmod.entity.Entities;
 import com.github.ptom76.tutorialfabricmod.item.ItemGroups;
 import com.github.ptom76.tutorialfabricmod.item.Items;
@@ -32,6 +33,9 @@ public void onInitialize() {
 
         // クリエイティブタブの登録
         ItemGroups.addItems();
+
+        // エンチャントの登録
+        Enchantments.init();
     }
 
     // Identifierを生成する

src/main/java/com/github/ptom76/tutorialfabricmod/enchantment/Enchantments.java

@@ -0,0 +1,15 @@
+package com.github.ptom76.tutorialfabricmod.enchantment;
+
+import com.github.ptom76.tutorialfabricmod.TutorialFabricMod;
+import net.minecraft.enchantment.Enchantment;
+import net.minecraft.registry.Registries;
+import net.minecraft.registry.Registry;
+
+public class Enchantments {
+    public static Enchantment FREEZE = new FreezeEnchantment();
+
+    public static void init() {
+        // エンチャント登録
+        Registry.register(Registries.ENCHANTMENT, TutorialFabricMod.id("freeze"), FREEZE);
+    }
+}

src/main/java/com/github/ptom76/tutorialfabricmod/enchantment/FreezeEnchantment.java

@@ -0,0 +1,95 @@
+package com.github.ptom76.tutorialfabricmod.enchantment;
+
+import com.github.ptom76.tutorialfabricmod.timer.StuffTimerAccess;
+import net.minecraft.block.Blocks;
+import net.minecraft.enchantment.Enchantment;
+import net.minecraft.enchantment.EnchantmentTarget;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EquipmentSlot;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.entity.effect.StatusEffectInstance;
+import net.minecraft.entity.effect.StatusEffects;
+import net.minecraft.sound.SoundEvents;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+
+public class FreezeEnchantment extends Enchantment {
+    public FreezeEnchantment() {
+        super(Rarity.UNCOMMON, EnchantmentTarget.WEAPON, new EquipmentSlot[]{EquipmentSlot.MAINHAND});
+    }
+
+    @Override
+    public int getMaxPower(int level) {
+        return super.getMinPower(level) + 50;
+    }
+
+    @Override
+    public int getMinPower(int level) {
+        return level * 10;
+    }
+
+    @Override
+    public int getMaxLevel() {
+        return 3;
+    }
+
+    @Override
+    public void onTargetDamaged(LivingEntity user, Entity target, int level) {
+        if (target instanceof LivingEntity) {
+            LivingEntity entity = (LivingEntity) target;
+            BlockPos pos = entity.getBlockPos();
+            World world = entity.getWorld();
+            // ブロックが空気のとき
+            if (world.getBlockState(pos).isAir()) {
+                // 音の再生
+                target.playSound(SoundEvents.BLOCK_GLASS_BREAK, 1f, 1f);
+
+                // 薄氷の設置
+                world.setBlockState(pos, Blocks.ICE.getDefaultState());
+            }
+            if (world.getBlockState(pos.up()).isAir()) {
+                world.setBlockState(pos.up(), Blocks.ICE.getDefaultState());
+            }
+
+            // 移動速度低下の追加
+            entity.addStatusEffect(new StatusEffectInstance(StatusEffects.SLOWNESS, 500, 255, false, false, false));
+
+            StuffTimerAccess stuffTimerAccess = (StuffTimerAccess) world.getServer();
+
+            stuffTimerAccess.tutorialFabricMod_addTimer(5, () -> {
+                // エンティティの場所を設定
+                entity.teleport(pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5);
+                return true;
+            });
+
+            stuffTimerAccess.tutorialFabricMod_addTimer(45, () -> {
+                // ブロックが薄氷のとき、
+                if (world.getBlockState(pos).getBlock() == Blocks.ICE) {
+
+                    // ブロック破壊
+                    world.breakBlock(pos, false);
+
+                    // 攻撃
+                    entity.damage(DamageSource.FREEZE, level * 2);
+                }
+                return true;
+            });
+            stuffTimerAccess.tutorialFabricMod_addTimer(50, () -> {
+                // pos.up()はY座標に+1
+                if (world.getBlockState(pos.up()).getBlock() == Blocks.ICE) {
+                    world.breakBlock(pos.up(), false);
+                    entity.damage(DamageSource.FREEZE, level * 3);
+                }
+
+                // 移動速度低下の除去
+                entity.removeStatusEffect(StatusEffects.SLOWNESS);
+
+                return true;
+            });
+
+
+        }
+        super.onTargetDamaged(user, target, level);
+    }
+}

src/main/java/com/github/ptom76/tutorialfabricmod/mixin/StuffTimer.java

@@ -0,0 +1,37 @@
+package com.github.ptom76.tutorialfabricmod.mixin;
+
+import com.github.ptom76.tutorialfabricmod.timer.StuffTimerAccess;
+import com.github.ptom76.tutorialfabricmod.timer.TickTimer;
+import net.minecraft.server.MinecraftServer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
+
+@Mixin(MinecraftServer.class)
+public class StuffTimer implements StuffTimerAccess {
+    @Unique
+    private final List<TickTimer> tickTimers = new ArrayList<>();
+
+    @Inject(method = "tick", at = @At("TAIL"))
+    private void onTick(CallbackInfo ci) {
+        if (tickTimers.isEmpty()) return;
+
+        for (TickTimer tickTimer : tickTimers) {
+            if (--tickTimer.ticksUntilSomething == 0) {
+                tickTimer.supplier.get();
+            }
+        }
+
+    }
+
+    @Override
+    public void tutorialFabricMod_addTimer(long ticksUntilSomething, Supplier<Boolean> supplier) {
+        tickTimers.add(new TickTimer(ticksUntilSomething, supplier));
+    }
+}

src/main/java/com/github/ptom76/tutorialfabricmod/timer/StuffTimerAccess.java

@@ -0,0 +1,7 @@
+package com.github.ptom76.tutorialfabricmod.timer;
+
+import java.util.function.Supplier;
+
+public interface StuffTimerAccess {
+    void tutorialFabricMod_addTimer(long ticksUntilSomething, Supplier<Boolean> supplier);
+}

src/main/java/com/github/ptom76/tutorialfabricmod/timer/TickTimer.java

@@ -0,0 +1,13 @@
+package com.github.ptom76.tutorialfabricmod.timer;
+
+import java.util.function.Supplier;
+
+public class TickTimer {
+    public long ticksUntilSomething;
+    public Supplier<Boolean> supplier;
+
+    public TickTimer(long ticksUntilSomething, Supplier<Boolean> supplier) {
+        this.ticksUntilSomething = ticksUntilSomething;
+        this.supplier = supplier;
+    }
+}

src/main/resources/assets/tutorialfabricmod/lang/en_us.json

@@ -13,6 +13,7 @@
   "block.tutorialfabricmod.tutorial_block": "Tutorial Block",
   "block.tutorialfabricmod.click_count_block": "Click Count Block",
   "block.tutorialfabricmod.blue_apple_generator": "Blue Apple Generator",
+  "enchantment.tutorialfabricmod.freeze": "Freeze",
 
   "itemGroup.tutorialfabricmod.tutorial": "Tutorial Mod"
 }

src/main/resources/tutorialfabricmod.mixins.json

@@ -4,6 +4,7 @@
   "package": "com.github.ptom76.tutorialfabricmod.mixin",
   "compatibilityLevel": "JAVA_17",
   "mixins": [
+    "StuffTimer"
   ],
   "client": [
   ],