今天我们在模组中尝试实现几种特殊的buff效果

1.在开发包中新建effects包 -> effects包中新建一个BsaeEffect类作为我们效果的基类:

BaseEffect.java

public class BaseEffect extends Effect {



    private boolean instant;

    private boolean isRegistered = false;



    public BaseEffect(EffectType type, int color, boolean isInstant) {

        super(type, color);

        this.instant = isInstant;

    }



    public boolean isInstantenous() {

        return false;

    }



    @Override

    public boolean isDurationEffectTick(int remainingTicks, int level) {

        if (isInstantenous()) {

            return true;

        }

        return canApplyEffect(remainingTicks, level);

    }



    protected boolean canApplyEffect(int remainingTicks, int level) {

        if (!isInstantenous()) {

            //Log.w("Non instant effects should override canApplyEffect!");

            Thread.dumpStack();

        }

        return false;

    }



    @Override

    public void applyEffectTick(LivingEntity entity, int amplifier) {

        if (isInstantenous()) {

            applyInstantenousEffect(null, null, entity, amplifier, 1.0d);

        }

    }



    public BaseEffect onRegister() {

        isRegistered = true;

        return this;

    }



    public boolean isRegistered() {

        return isRegistered;

    }

}

2.在effects包中定义一个我们的效果类EffectErosion，让其继承我们的效果基类:

EffectErosion.java

package com.joy187.re8joymod.common.effects;



import net.minecraft.entity.LivingEntity;

import net.minecraft.inventory.EquipmentSlotType;

import net.minecraft.item.ItemStack;

import net.minecraft.potion.EffectType;



import java.util.Random;



public class EffectErosion extends BaseEffect {

    public EffectErosion(EffectType type, int color, boolean isInstant) {

        super(type, color, isInstant);

    }



    @Override

    protected boolean canApplyEffect(int remainingTicks, int level) {

        return remainingTicks % 7 == 0;

    }



    //这个是buff在身上持续作用的效果函数

    @Override

    public void applyEffectTick(LivingEntity living, int amplified) {

        amplified ++;

        Random ran = new Random();

        int co = ran.nextInt(5);

        for (EquipmentSlotType slot: EquipmentSlotType.values()) {

            DamageItemInSlot(slot, living, co*amplified);

        }



    }



    //我们的效果是要让装备盔甲值快速减少，所以增加一个Damage函数

    public void DamageItemInSlot(EquipmentSlotType slot, LivingEntity livingBase, int amount)

    {

        ItemStack stack = livingBase.getItemBySlot(slot);

        stack.hurtAndBreak(amount,livingBase,null);

    }



    //声明buff是好buff还是debuff

    @Override

    public boolean isBeneficial() {

        return false;

    }



}

3.在init包中新建一个ModEffects类，用于将我们所有的效果进行注册:

ModEffects.java

package com.joy187.re8joymod.common.init;



import com.joy187.re8joymod.common.effects.EffectDeadly;

import com.joy187.re8joymod.common.effects.EffectErosion;

import net.minecraft.potion.Effect;

import net.minecraft.potion.EffectType;

import net.minecraftforge.fml.RegistryObject;

import net.minecraftforge.registries.DeferredRegister;

import net.minecraftforge.registries.ForgeRegistries;



public class ModEffects {

    public static final DeferredRegister<Effect> EFFECTS = DeferredRegister.create(ForgeRegistries.POTIONS,"re8joymod");

    //buff1

    public static RegistryObject<Effect> EROSION = EFFECTS.register("erosion",()->

    {

                    //3个参数:药水类型(好/坏/中)、药水粒子颜色、是否为即时效果(类似于瞬间伤害效果)

        return new EffectErosion(EffectType.HARMFUL, 0x660033, false);

    });



    //buff2

    //public static RegistryObject<Effect> DEADLY = EFFECTS.register("deadly",()->

    //{

    //    return new EffectDeadly(EffectType.NEUTRAL, 0x333333, false);

    //});



    //buff3...



}

在Main类中将我们的ModEffects加入到初始化函数中:

Main.java中的Main()函数

public Main(){

        IEventBus bus = FMLJavaModLoadingContext.get().getModEventBus();



        bus.addListener(this::setup);

        bus.addListener(this::doClientStuff);



        SoundInit.SOUND_TYPES.register(bus);

        EntityInit.ENTITY_TYPES.register(bus);

        ModItems.ITEMS.register(bus);

        ModBlocks.BLOCKS.register(bus);



        //将我们的buff效果在bus中注册

        ModEffects.EFFECTS.register(bus);



        ModTileEntities.register(bus);

        ModContainers.register(bus);



        ModStructures.register(bus);

        SurfaceBuilderInit.SURFACE_BUILDERS.register(bus);

        BiomeInit.BIOMES.register(bus);

        BiomeInit.registerBiomes();



        ModLoadingContext.get().registerConfig(ModConfig.Type.COMMON,SPEC,"re8joymod-common.toml");



        MinecraftForge.EVENT_BUS.register(this);

    }

4.在resources包中的lang文件中添加我们药水的名称

en_us.json中添加:

"effect.re8joymod.erosion": "Erosion Biohazard",

在textures/mob_effect中添加我们所有buff的贴图，名称与第3步中的效果注册名称相同

5.保存项目 -> 启动游戏调试

我们可以用指令来给予自己的buff效果:
/effect give @p modid:buff名称
以/effect give @p re8joymod:erosion为例:

可以看到我们的buff效果的确出现了，同时我们的盔甲值在buff期间持续地掉落。