Forge MC 1.19.2 2.新的弓和弩。
由于本人水平不到位，不能实现使用ExzItem作为发射物，只是作为对原版的扩充
新建MyCrossBow.java
package dogegg.infected.item;
import com.google.common.collect.Lists;
import com.mojang.math.Quaternion;
import com.mojang.math.Vector3f;
import net.minecraft.ChatFormatting;
import net.minecraft.advancements.CriteriaTriggers;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.nbt.ListTag;
import net.minecraft.network.chat.Component;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.stats.Stats;
import net.minecraft.util.RandomSource;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResultHolder;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.monster.CrossbowAttackMob;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.entity.projectile.AbstractArrow;
import net.minecraft.world.entity.projectile.FireworkRocketEntity;
import net.minecraft.world.entity.projectile.Projectile;
import net.minecraft.world.item.*;
import net.minecraft.world.item.enchantment.EnchantmentHelper;
import net.minecraft.world.item.enchantment.Enchantments;
import net.minecraft.world.level.Level;
import net.minecraft.world.phys.Vec3;
import javax.annotation.Nullable;
import java.util.List;
import java.util.function.Predicate;
public class MyCrossBow extends ProjectileWeaponItem implements Vanishable {
private static final String TAG_CHARGED = "Charged";
private static final String TAG_CHARGED_PROJECTILES = "ChargedProjectiles";
private static final int MAX_CHARGE_DURATION = 25;
public static final int DEFAULT_RANGE = 8;
private boolean startSoundPlayed = false;
private boolean midLoadSoundPlayed = false;
private static final float START_SOUND_PERCENT = 0.2F;
private static final float MID_SOUND_PERCENT = 0.5F;
private static final float ARROW_POWER = 3F;
private static final float FIREWORK_POWER = 1.6F;
public static final Predicate
return p_43015_.is(Items.FIREWORK_ROCKET);
});
public MyCrossBow(Item.Properties p_40850_) {
super(p_40850_);
}
public Predicate
return ARROW_OR_FIREWORK;
}
public Predicate
return ARROW_ONLY;
}
public InteractionResultHolder
ItemStack itemstack = p_40921_.getItemInHand(p_40922_);
if (isCharged(itemstack)) {
performShooting(p_40920_, p_40921_, p_40922_, itemstack, getShootingPower(itemstack), 1.0F);
setCharged(itemstack, false);
return InteractionResultHolder.consume(itemstack);
} else if (!p_40921_.getProjectile(itemstack).isEmpty()) {
if (!isCharged(itemstack)) {
this.startSoundPlayed = false;
this.midLoadSoundPlayed = false;
p_40921_.startUsingItem(p_40922_);
}
return InteractionResultHolder.consume(itemstack);
} else {
return InteractionResultHolder.fail(itemstack);
}
}
private static float getShootingPower(ItemStack p_40946_) {
return containsChargedProjectile(p_40946_, Items.FIREWORK_ROCKET) ? 5F : 10F;
}
public void releaseUsing(ItemStack p_40875_, Level p_40876_, LivingEntity p_40877_, int p_40878_) {
int i = this.getUseDuration(p_40875_) - p_40878_;
float f = getPowerForTime(i, p_40875_);
if (f >= 1.0F && !isCharged(p_40875_) && tryLoadProjectiles(p_40877_, p_40875_)) {
setCharged(p_40875_, true);
SoundSource soundsource = p_40877_ instanceof Player ? SoundSource.PLAYERS : SoundSource.HOSTILE;
p_40876_.playSound((Player)null, p_40877_.getX(), p_40877_.getY(), p_40877_.getZ(), SoundEvents.CROSSBOW_LOADING_END, soundsource, 1.0F, 1.0F / (p_40876_.getRandom().nextFloat() * 0.5F + 1.0F) + 0.2F);
}
}
private static boolean tryLoadProjectiles(LivingEntity p_40860_, ItemStack p_40861_) {
int i = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.MULTISHOT, p_40861_);
int j = i == 0 ? 1 : 3;
boolean flag = p_40860_ instanceof Player && ((Player)p_40860_).getAbilities().instabuild;
ItemStack itemstack = p_40860_.getProjectile(p_40861_);
ItemStack itemstack1 = itemstack.copy();
for(int k = 0; k < j; ++k) {
if (k > 0) {
itemstack = itemstack1.copy();
}
if (itemstack.isEmpty() && flag) {
itemstack = new ItemStack(Items.ARROW);
itemstack1 = itemstack.copy();
}
if (!loadProjectile(p_40860_, p_40861_, itemstack, k > 0, flag)) {
return false;
}
}
return true;
}
private static boolean loadProjectile(LivingEntity p_40863_, ItemStack p_40864_, ItemStack p_40865_, boolean p_40866_, boolean p_40867_) {
if (p_40865_.isEmpty()) {
return false;
} else {
boolean flag = p_40867_ && p_40865_.getItem() instanceof ArrowItem;
ItemStack itemstack;
if (!flag && !p_40867_ && !p_40866_) {
itemstack = p_40865_.split(1);
if (p_40865_.isEmpty() && p_40863_ instanceof Player) {
((Player)p_40863_).getInventory().removeItem(p_40865_);
}
} else {
itemstack = p_40865_.copy();
}
addChargedProjectile(p_40864_, itemstack);
return true;
}
}
public static boolean isCharged(ItemStack p_40933_) {
CompoundTag compoundtag = p_40933_.getTag();
return compoundtag != null && compoundtag.getBoolean("Charged");
}
public static void setCharged(ItemStack p_40885_, boolean p_40886_) {
CompoundTag compoundtag = p_40885_.getOrCreateTag();
compoundtag.putBoolean("Charged", p_40886_);
}
private static void addChargedProjectile(ItemStack p_40929_, ItemStack p_40930_) {
CompoundTag compoundtag = p_40929_.getOrCreateTag();
ListTag listtag;
if (compoundtag.contains("ChargedProjectiles", 9)) {
listtag = compoundtag.getList("ChargedProjectiles", 10);
} else {
listtag = new ListTag();
}
CompoundTag compoundtag1 = new CompoundTag();
p_40930_.save(compoundtag1);
listtag.add(compoundtag1);
compoundtag.put("ChargedProjectiles", listtag);
}
private static List
List
CompoundTag compoundtag = p_40942_.getTag();
if (compoundtag != null && compoundtag.contains("ChargedProjectiles", 9)) {
ListTag listtag = compoundtag.getList("ChargedProjectiles", 10);
if (listtag != null) {
for(int i = 0; i < listtag.size(); ++i) {
CompoundTag compoundtag1 = listtag.getCompound(i);
list.add(ItemStack.of(compoundtag1));
}
}
}
return list;
}
private static void clearChargedProjectiles(ItemStack p_40944_) {
CompoundTag compoundtag = p_40944_.getTag();
if (compoundtag != null) {
ListTag listtag = compoundtag.getList("ChargedProjectiles", 9);
listtag.clear();
compoundtag.put("ChargedProjectiles", listtag);
}
}
public static boolean containsChargedProjectile(ItemStack p_40872_, Item p_40873_) {
return getChargedProjectiles(p_40872_).stream().anyMatch((p_40870_) -> {
return p_40870_.is(p_40873_);
});
}
private static void shootProjectile(Level p_40895_, LivingEntity p_40896_, InteractionHand p_40897_, ItemStack p_40898_, ItemStack p_40899_, float p_40900_, boolean p_40901_, float p_40902_, float p_40903_, float p_40904_) {
if (!p_40895_.isClientSide) {
boolean flag = p_40899_.is(Items.FIREWORK_ROCKET);
Projectile projectile;
if (flag) {
projectile = new FireworkRocketEntity(p_40895_, p_40899_, p_40896_, p_40896_.getX(), p_40896_.getEyeY() - (double)0.15F, p_40896_.getZ(), true);
} else {
projectile = getArrow(p_40895_, p_40896_, p_40898_, p_40899_);
if (p_40901_ || p_40904_ != 0.0F) {
((AbstractArrow)projectile).pickup = AbstractArrow.Pickup.CREATIVE_ONLY;
}
}
if (p_40896_ instanceof CrossbowAttackMob) {
CrossbowAttackMob crossbowattackmob = (CrossbowAttackMob)p_40896_;
crossbowattackmob.shootCrossbowProjectile(crossbowattackmob.getTarget(), p_40898_, projectile, p_40904_);
} else {
Vec3 vec31 = p_40896_.getUpVector(1.0F);
Quaternion quaternion = new Quaternion(new Vector3f(vec31), p_40904_, true);
Vec3 vec3 = p_40896_.getViewVector(1.0F);
Vector3f vector3f = new Vector3f(vec3);
vector3f.transform(quaternion);
projectile.shoot((double)vector3f.x(), (double)vector3f.y(), (double)vector3f.z(), p_40902_, p_40903_);
}
p_40898_.hurtAndBreak(flag ? 3 : 1, p_40896_, (p_40858_) -> {
p_40858_.broadcastBreakEvent(p_40897_);
});
p_40895_.addFreshEntity(projectile);
p_40895_.playSound((Player)null, p_40896_.getX(), p_40896_.getY(), p_40896_.getZ(), SoundEvents.CROSSBOW_SHOOT, SoundSource.PLAYERS, 1.0F, p_40900_);
}
}
private static AbstractArrow getArrow(Level p_40915_, LivingEntity p_40916_, ItemStack p_40917_, ItemStack p_40918_) {
ArrowItem arrowitem = (ArrowItem)(p_40918_.getItem() instanceof ArrowItem ? p_40918_.getItem() : Items.ARROW);
AbstractArrow abstractarrow = arrowitem.createArrow(p_40915_, p_40918_, p_40916_);
if (p_40916_ instanceof Player) {
abstractarrow.setCritArrow(true);
}
abstractarrow.setSoundEvent(SoundEvents.CROSSBOW_HIT);
abstractarrow.setShotFromCrossbow(true);
int i = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.PIERCING, p_40917_);
if (i > 0) {
abstractarrow.setPierceLevel((byte)i);
}
return abstractarrow;
}
public static void performShooting(Level p_40888_, LivingEntity p_40889_, InteractionHand p_40890_, ItemStack p_40891_, float p_40892_, float p_40893_) {
if (p_40889_ instanceof Player player && net.minecraftforge.event.ForgeEventFactory.onArrowLoose(p_40891_, p_40889_.level, player, 1, true) < 0) return;
List
float[] afloat = getShotPitches(p_40889_.getRandom());
for(int i = 0; i < list.size(); ++i) {
ItemStack itemstack = list.get(i);
boolean flag = p_40889_ instanceof Player && ((Player)p_40889_).getAbilities().instabuild;
if (!itemstack.isEmpty()) {
if (i == 0) {
shootProjectile(p_40888_, p_40889_, p_40890_, p_40891_, itemstack, afloat[i], flag, p_40892_, p_40893_, 0.0F);
} else if (i == 1) {
shootProjectile(p_40888_, p_40889_, p_40890_, p_40891_, itemstack, afloat[i], flag, p_40892_, p_40893_, -10.0F);
} else if (i == 2) {
shootProjectile(p_40888_, p_40889_, p_40890_, p_40891_, itemstack, afloat[i], flag, p_40892_, p_40893_, 10.0F);
}
}
}
onCrossbowShot(p_40888_, p_40889_, p_40891_);
}
private static float[] getShotPitches(RandomSource p_220024_) {
boolean flag = p_220024_.nextBoolean();
return new float[]{1.0F, getRandomShotPitch(flag, p_220024_), getRandomShotPitch(!flag, p_220024_)};
}
private static float getRandomShotPitch(boolean p_220026_, RandomSource p_220027_) {
float f = p_220026_ ? 0.63F : 0.43F;
return 1.0F / (p_220027_.nextFloat() * 0.5F + 1.8F) + f;
}
private static void onCrossbowShot(Level p_40906_, LivingEntity p_40907_, ItemStack p_40908_) {
if (p_40907_ instanceof ServerPlayer serverplayer) {
if (!p_40906_.isClientSide) {
CriteriaTriggers.SHOT_CROSSBOW.trigger(serverplayer, p_40908_);
}
serverplayer.awardStat(Stats.ITEM_USED.get(p_40908_.getItem()));
}
clearChargedProjectiles(p_40908_);
}
public void onUseTick(Level p_40910_, LivingEntity p_40911_, ItemStack p_40912_, int p_40913_) {
if (!p_40910_.isClientSide) {
int i = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.QUICK_CHARGE, p_40912_);
SoundEvent soundevent = this.getStartSound(i);
SoundEvent soundevent1 = i == 0 ? SoundEvents.CROSSBOW_LOADING_MIDDLE : null;
float f = (float)(p_40912_.getUseDuration() - p_40913_) / (float)getChargeDuration(p_40912_);
if (f < 0.2F) {
this.startSoundPlayed = false;
this.midLoadSoundPlayed = false;
}
if (f >= 0.2F && !this.startSoundPlayed) {
this.startSoundPlayed = true;
p_40910_.playSound((Player)null, p_40911_.getX(), p_40911_.getY(), p_40911_.getZ(), soundevent, SoundSource.PLAYERS, 0.5F, 1.0F);
}
if (f >= 0.5F && soundevent1 != null && !this.midLoadSoundPlayed) {
this.midLoadSoundPlayed = true;
p_40910_.playSound((Player)null, p_40911_.getX(), p_40911_.getY(), p_40911_.getZ(), soundevent1, SoundSource.PLAYERS, 0.5F, 1.0F);
}
}
}
public int getUseDuration(ItemStack p_40938_) {
return getChargeDuration(p_40938_) + 3;
}
public static int getChargeDuration(ItemStack p_40940_) {
int i = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.QUICK_CHARGE, p_40940_);
return i == 0 ? 25 : 25 - 5 * i;
}
public UseAnim getUseAnimation(ItemStack p_40935_) {
return UseAnim.CROSSBOW;
}
private SoundEvent getStartSound(int p_40852_) {
switch (p_40852_) {
case 1:
return SoundEvents.CROSSBOW_QUICK_CHARGE_1;
case 2:
return SoundEvents.CROSSBOW_QUICK_CHARGE_2;
case 3:
return SoundEvents.CROSSBOW_QUICK_CHARGE_3;
default:
return SoundEvents.CROSSBOW_LOADING_START;
}
}
private static float getPowerForTime(int p_40854_, ItemStack p_40855_) {
float f = (float)p_40854_ / (float)getChargeDuration(p_40855_);
if (f > 1.0F) {
f = 1.0F;
}
return f;
}
public void appendHoverText(ItemStack p_40880_, @Nullable Level p_40881_, List
List
if (isCharged(p_40880_) && !list.isEmpty()) {
ItemStack itemstack = list.get(0);
p_40882_.add(Component.translatable("item.minecraft.crossbow.projectile").append(" ").append(itemstack.getDisplayName()));
if (p_40883_.isAdvanced() && itemstack.is(Items.FIREWORK_ROCKET)) {
List
Items.FIREWORK_ROCKET.appendHoverText(itemstack, p_40881_, list1, p_40883_);
if (!list1.isEmpty()) {
for(int i = 0; i < list1.size(); ++i) {
list1.set(i, Component.literal(" ").append(list1.get(i)).withStyle(ChatFormatting.GRAY));
}
p_40882_.addAll(list1);
}
}
}
}
public boolean useOnRelease(ItemStack p_150801_) {
return p_150801_.is(this);
}
public int getDefaultProjectileRange() {
return 8;
}
}
非常明显，方法getShootingPower决定了射击力度，同时囊括了射程与伤害
MyBow.java
package dogegg.infected.item;
import net.minecraft.world.item.BowItem;
public class MyBow extends BowItem {
public MyBow(Properties properties){super(properties);}
public static float getPowerForTime(int p_40662_) {
float f = (float)p_40662_ / 20.0F;
f = (f * f + f * 2.0F) / 3.0F;
if (f > 1.0F) {
f = 1.0F;
}
return f;
}
}
可以修改getPowerForTime方法来修改力度
随后按照前一篇文章中的方法来注册物品栏，添加资源文件等。
（可以翻阅原版的jar文件来实现动画，不过就几帧而已。）