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implement a homing projectile for the dark projectile
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112 changes: 112 additions & 0 deletions
112
src/main/java/de/teamlapen/vampirism/entity/HomingProjectile.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| package de.teamlapen.vampirism.entity; | ||
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| import net.minecraft.nbt.CompoundTag; | ||
| import net.minecraft.server.level.ServerLevel; | ||
| import net.minecraft.world.entity.EntityType; | ||
| import net.minecraft.world.entity.LivingEntity; | ||
| import net.minecraft.world.entity.projectile.AbstractHurtingProjectile; | ||
| import net.minecraft.world.level.Level; | ||
| import net.minecraft.world.phys.Vec3; | ||
| import org.jetbrains.annotations.NotNull; | ||
| import org.joml.Quaterniond; | ||
| import org.joml.Vector3d; | ||
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| import javax.annotation.Nullable; | ||
| import java.util.UUID; | ||
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| public abstract class HomingProjectile extends AbstractHurtingProjectile { | ||
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| @Nullable | ||
| private UUID targetUUID; | ||
| @Nullable | ||
| private LivingEntity cachedTarget; | ||
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| private Vec3 direction; | ||
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| protected HomingProjectile(EntityType<? extends AbstractHurtingProjectile> pEntityType, Level pLevel) { | ||
| super(pEntityType, pLevel); | ||
| } | ||
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| public HomingProjectile(EntityType<? extends AbstractHurtingProjectile> pEntityType, double pX, double pY, double pZ, Vec3 direction, Level pLevel) { | ||
| super(pEntityType, pX, pY, pZ, direction, pLevel); | ||
| this.direction = direction; | ||
| } | ||
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| public HomingProjectile(EntityType<? extends AbstractHurtingProjectile> pEntityType, LivingEntity pShooter, Vec3 offset, Level pLevel) { | ||
| super(pEntityType, pShooter, offset, pLevel); | ||
| } | ||
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| public void setTarget(@Nullable LivingEntity cachedTarget) { | ||
| if (cachedTarget != null) { | ||
| this.targetUUID = cachedTarget.getUUID(); | ||
| this.cachedTarget = cachedTarget; | ||
| } | ||
| } | ||
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| @Override | ||
| public void addAdditionalSaveData(@NotNull CompoundTag pCompound) { | ||
| super.addAdditionalSaveData(pCompound); | ||
| if (this.targetUUID != null) { | ||
| pCompound.putUUID("target", this.targetUUID); | ||
| } | ||
| } | ||
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| @Override | ||
| public void readAdditionalSaveData(@NotNull CompoundTag pCompound) { | ||
| super.readAdditionalSaveData(pCompound); | ||
| if (pCompound.hasUUID("target")) { | ||
| this.targetUUID = pCompound.getUUID("target"); | ||
| } | ||
| } | ||
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| @Nullable | ||
| protected LivingEntity getTarget() { | ||
| if (targetUUID != null) { | ||
| if (this.cachedTarget != null) { | ||
| if (this.cachedTarget.isRemoved()) { | ||
| this.cachedTarget = null; | ||
| } else { | ||
| return this.cachedTarget; | ||
| } | ||
| } else if (this.level() instanceof ServerLevel serverLevel) { | ||
| this.cachedTarget = (LivingEntity) serverLevel.getEntity(this.targetUUID); | ||
| return this.cachedTarget; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| @Override | ||
| public void tick() { | ||
| super.tick(); | ||
| LivingEntity target = getTarget(); | ||
| if (target != null) { | ||
| Vec3 updatedTarget = target.getEyePosition(); | ||
| Vec3 position = position(); | ||
| Vec3 idealDirection = updatedTarget.subtract(position); | ||
| Vec3 currentDirection = this.direction; | ||
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| double angleBetween = Math.acos(idealDirection.dot(currentDirection)); | ||
| double maxAngle = Math.toRadians(20); | ||
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| if (angleBetween > maxAngle) { | ||
| Vec3 rotationAxis = currentDirection.cross(idealDirection).normalize(); | ||
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| // Create a quaternion for the rotation | ||
| Quaterniond rotation = new Quaterniond().rotationAxis(maxAngle, rotationAxis.x, rotationAxis.y, rotationAxis.z); | ||
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| // Apply the rotation to the current direction | ||
| Vector3d newDir = rotation.transform(new Vector3d(currentDirection.x, currentDirection.y, currentDirection.z)); | ||
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| this.direction = new Vec3(newDir.x, newDir.y, newDir.z); | ||
| } else { | ||
| this.direction = idealDirection; | ||
| } | ||
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| // use the acceleration from the superclass | ||
| double length = getDeltaMovement().length(); | ||
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| this.setDeltaMovement(this.direction.normalize().scale(length)); | ||
| } | ||
| } | ||
| } |
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