Minecraft 1.12.2模组开发(四十) buff效果(Potion Effect)

今天我们在1.12.2的模组中尝试实现几种特殊的buff效果

1.在开发包中新建potion包 -> potion包中新建一个BaseSimplePotion类作为我们药水效果的基类:

BaseSimplePotion.java

package com.joy187.rejoymod.potion.buff;import com.joy187.rejoymod.potion.ModPotions;
import com.joy187.rejoymod.util.Reference;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
import net.minecraft.init.PotionTypes;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.potion.PotionType;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;public class BaseSimplePotion extends Potion {//确定所有效果贴图的位置protected static final ResourceLocation resource = new ResourceLocation(Reference.Mod_ID,"textures/misc/potions.png");protected final int iconIndex;PotionType potionType=PotionTypes.MUNDANE;//    if (!this.world.isRemote)
//    {
//        layer.getPotion().applyAttributesModifiersToEntity(this, this.getAttributeMap(), layer.getAmplifier());
//    }public PotionType getPotionType() {return potionType;}//参数：是否为debuff buff粒子颜色 buff名称 buff对应的图标public BaseSimplePotion(boolean isBadEffectIn, int liquidColorIn, String name, int icon) {super(isBadEffectIn, liquidColorIn);setRegistryName(new ResourceLocation(Reference.Mod_ID, name));setPotionName("rejoymod.potion." + name);iconIndex = icon;ModPotions.INSTANCES.add(this);//setCreativeTab(tabs);}@SideOnly(Side.CLIENT)protected void render(int x, int y, float alpha) {Minecraft.getMinecraft().renderEngine.bindTexture(resource);Tessellator tessellator = Tessellator.getInstance();BufferBuilder buf = tessellator.getBuffer();buf.begin(7, DefaultVertexFormats.POSITION_TEX);GlStateManager.color(1, 1, 1, alpha);int textureX = iconIndex % 14 * 18;int textureY = 198 - iconIndex / 14 * 18;buf.pos(x, y + 18, 0).tex(textureX * 0.00390625, (textureY + 18) * 0.00390625).endVertex();buf.pos(x + 18, y + 18, 0).tex((textureX + 18) * 0.00390625, (textureY + 18) * 0.00390625).endVertex();buf.pos(x + 18, y, 0).tex((textureX + 18) * 0.00390625, textureY * 0.00390625).endVertex();buf.pos(x, y, 0).tex(textureX * 0.00390625, textureY * 0.00390625).endVertex();tessellator.draw();}//在我们的个人界面显示药水效果UI@Override@SideOnly(Side.CLIENT)public void renderInventoryEffect(int x, int y, PotionEffect effect, Minecraft mc) {render(x + 6, y + 7, 1);}@Override@SideOnly(Side.CLIENT)public void renderHUDEffect(int x, int y, PotionEffect effect, Minecraft mc, float alpha) {render(x + 3, y + 3, alpha);}
}

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

PotionZenHeart.java

package com.joy187.rejoymod.potion.buff;import com.joy187.rejoymod.init.ModParticles;
import com.joy187.rejoymod.potion.ModPotions;
import com.joy187.rejoymod.util.EntityUtil;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.potion.PotionEffect;
import net.minecraft.util.DamageSource;
import net.minecraft.world.World;
import net.minecraftforge.event.entity.living.LivingHurtEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;import javax.annotation.Nonnull;
import java.util.Collection;
import java.util.Random;public class PotionZenHeart extends BasePotion {public PotionZenHeart(boolean isBadEffectIn, int liquidColorIn, String name, int icon) {super(isBadEffectIn, liquidColorIn, name, icon);resistancePerLevel = 0.25f;}//我们药水的实际效果@Overridepublic void performEffect(@Nonnull EntityLivingBase living, int amplified) {Random ran = new Random();int co = ran.nextInt(5);//回血效果if(co==4) living.heal(ran.nextFloat());}//当生物受伤，就减少其受到的魔法伤害@SubscribeEventpublic static void onCreatureHurt(LivingHurtEvent event) {World world = event.getEntity().getEntityWorld();EntityLivingBase hurtOne = event.getEntityLiving();if (event.isCanceled() || !event.getSource().isMagicDamage()){return;}//魔法减伤Collection<PotionEffect> activePotionEffects = hurtOne.getActivePotionEffects();for (int i = 0; i < activePotionEffects.size(); i++) {PotionEffect buff = (PotionEffect)activePotionEffects.toArray()[i];if (buff.getPotion() instanceof PotionZenHeart){PotionZenHeart modBuff = (PotionZenHeart)buff.getPotion();if (!world.isRemote){float reduceRatio = modBuff.resistancePerLevel * (buff.getAmplifier());event.setAmount(Math.max(1 - reduceRatio, 0f) * event.getAmount());}}}}
}

3.在potion包中新建一个ModPotions类，用于将我们所有的药水效果进行注册:

ModPotions.java

package com.joy187.rejoymod.potion;import com.joy187.rejoymod.IdlFramework;
import com.joy187.rejoymod.init.InitPotionTypes;
import com.joy187.rejoymod.potion.buff.*;
import com.joy187.rejoymod.util.Reference;
import net.minecraft.init.MobEffects;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.potion.PotionType;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.List;@Mod.EventBusSubscriber(modid = Reference.Mod_ID)
public class ModPotions {public static final List<Potion> INSTANCES = new ArrayList<Potion>();public static final List<PotionType> TYPE_INSTANCES = new ArrayList<>();//将模组中所有的药水效果都进行注册//public static final PotionDeadly DEADLY = new PotionDeadly(true, 0x333333, "deadly", 0);public static final PotionZenHeart ZEN_HEART = new PotionZenHeart(false, 0xcccc00, "zen_heart", 1);//public static final PotionInsidiousDisease BURN = new PotionInsidiousDisease(true, 0x000033, "burn", 2);//public static final PotionErosion EROSION = new PotionErosion(true, 0x660033, "erosion", 8);@Nullableprivate static Potion getRegisteredMobEffect(String id){Potion potion = Potion.REGISTRY.getObject(new ResourceLocation(id));if (potion == null){throw new IllegalStateException("Invalid MobEffect requested: " + id);}else{return potion;}}@SubscribeEventpublic static void registerPotions(RegistryEvent.Register<Potion> event){
//        VIRUS_ONE.tuples.add(new EffectTuple(0.2f, MobEffects.NAUSEA, 100));event.getRegistry().registerAll(INSTANCES.toArray(new Potion[0]));IdlFramework.LogWarning("registered %d potion", INSTANCES.size());}@SubscribeEventpublic static void registerPotionTypes(RegistryEvent.Register<PotionType> evt) {InitPotionTypes.init();evt.getRegistry().registerAll(TYPE_INSTANCES.toArray(new PotionType[0]));IdlFramework.Log("registered %d potion item(s)", TYPE_INSTANCES.size());}}

4.在potion包中新建ModPotionType类，用于说明我们的药水类型:

ModPotionType.java

package com.joy187.rejoymod.potion;import com.joy187.rejoymod.util.Reference;
import net.minecraft.potion.PotionEffect;
import net.minecraft.potion.PotionType;
import javax.annotation.Nullable;public class ModPotionType extends PotionType {protected ModPotionType(PotionEffect... p_i46739_1_) {this(null, p_i46739_1_);}public ModPotionType(@Nullable String p_i46740_1_, PotionEffect... p_i46740_2_) {super(p_i46740_1_, p_i46740_2_);setRegistryName(Reference.Mod_ID, p_i46740_1_);ModPotions.TYPE_INSTANCES.add(this);}
}

5.在init包中新建InitPotionTypes类，用于对我们的药水效果类型进行初始化工作:

InitPotionTypes.java

package com.joy187.rejoymod.init;
import com.joy187.rejoymod.item.ModItems;
import com.joy187.rejoymod.potion.ModPotionType;
import com.joy187.rejoymod.potion.ModPotions;
import net.minecraft.init.*;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.potion.PotionHelper;
import net.minecraft.potion.PotionType;import static net.minecraft.init.PotionTypes.AWKWARD;public class InitPotionTypes {public static final PotionType BLINDNESS;public static final PotionType LUCKY;public static final PotionType UNLUCKY;public static final PotionType HASTE;public static final PotionType RESISTANCE;public static final PotionType WITHER;public static final PotionType LEVITATION;public static final PotionType GLOWING;//public static final PotionType LONG_BLINDNESS;public static final int DURA_GOOD_3 = 1600;public static final int DURA_GOOD_4 = 1200;public static final ModPotionType REGEN_3  = new ModPotionType("regen_3", new PotionEffect(MobEffects.REGENERATION, 450, 2));public static final ModPotionType REGEN_4  = new ModPotionType("regen_4", new PotionEffect(MobEffects.REGENERATION, 200, 3));static{if (!Bootstrap.isRegistered()){throw new RuntimeException("Accessed Potions before Bootstrap!");}else{BLINDNESS = createType(MobEffects.BLINDNESS);LUCKY = createType(MobEffects.LUCK);UNLUCKY = createType(MobEffects.UNLUCK);HASTE = createType(MobEffects.HASTE);RESISTANCE = createType(MobEffects.RESISTANCE);WITHER = createType(MobEffects.WITHER);LEVITATION = createType(MobEffects.LEVITATION);GLOWING = createType(MobEffects.GLOWING);}}public static void init(){//Modded potion effectsPotionHelper.addMix(AWKWARD, ModItems.HUMUS, ModPotions.DEADLY.getPotionType());PotionHelper.addMix(AWKWARD, ModItems.HUMUS, ModPotions.ZEN_HEART.getPotionType());//        PotionHelper.addMix(AWKWARD, ModItems.CHILLI, ModPotions.VIRUS_ONE.getPotionType());
//        PotionHelper.addMix(AWKWARD, Items.ROTTEN_FLESH, ModPotions.UNDYING.getPotionType());//-----------------------------Types}static ModPotionType createType(Potion potion){//mostly for vanillareturn new ModPotionType(potion.getName(), getEffect(potion));}public static PotionEffect getEffect(Potion potion){return new PotionEffect(potion, potion.isBadEffect() ? 1800 : 3600);}
}

6.在resources包中的lang文件中添加我们所有药水效果的名称

en_us.lang中添加:

#Potions
rejoymod.potion.zen_heart=Virus Power
#rejoymod.potion.burn=E Decay
#rejoymod.potion.erosion=Erosion Biohazard

在textures\misc中添加我们potions贴图，名称为potions.png(第一步中的ResourceLocation)

我们的potions图片(可直接下载)，从第二行最左边开始第一个icon(0号)开始，往右依次加1作为其序号:

7.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 @p modid:buff名称
以/effect @p rejoymod:zen_heart为例:

可以看到我们的buff效果的确出现了，同时我们的生命回复效果在buff期间一直非常强。

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