Paper/patches/server/0254-Add-LivingEntity-getTargetEntity.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Sat, 22 Sep 2018 00:33:08 -0500
Subject: [PATCH] Add LivingEntity#getTargetEntity
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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index d8681ace0ba74a6eb3b6abafe4915b5e753c02f0..bf493378dca5f9ebb4e098c7552d9fdb1ea1822d 100644
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--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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@@ -127,6 +127,7 @@ import net.minecraft.world.level.storage.loot.LootTable;
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import net.minecraft.world.level.storage.loot.parameters.LootContextParamSets;
import net.minecraft.world.level.storage.loot.parameters.LootContextParams;
import net.minecraft.world.phys.AABB;
+import net.minecraft.world.phys.EntityHitResult;
import net.minecraft.world.phys.HitResult;
import net.minecraft.world.phys.Vec3;
import net.minecraft.world.scores.PlayerTeam;
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@@ -4013,6 +4014,38 @@ public abstract class LivingEntity extends Entity implements Attackable {
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return this.level().clip(raytrace);
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}
+ public @Nullable EntityHitResult getTargetEntity(int maxDistance) {
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+ if (maxDistance < 1 || maxDistance > 120) {
+ throw new IllegalArgumentException("maxDistance must be between 1-120");
+ }
+
+ Vec3 start = this.getEyePosition(1.0F);
+ Vec3 direction = this.getLookAngle();
+ Vec3 end = start.add(direction.x * maxDistance, direction.y * maxDistance, direction.z * maxDistance);
+
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+ List<Entity> entityList = this.level().getEntities(this, getBoundingBox().expandTowards(direction.x * maxDistance, direction.y * maxDistance, direction.z * maxDistance).inflate(1.0D, 1.0D, 1.0D), EntitySelector.NO_SPECTATORS.and(Entity::isPickable));
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+
+ double distance = 0.0D;
+ EntityHitResult result = null;
+
+ for (Entity entity : entityList) {
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+ final double inflationAmount = (double) entity.getPickRadius();
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+ AABB aabb = entity.getBoundingBox().inflate(inflationAmount, inflationAmount, inflationAmount);
+ Optional<Vec3> rayTraceResult = aabb.clip(start, end);
+
+ if (rayTraceResult.isPresent()) {
+ Vec3 rayTrace = rayTraceResult.get();
+ double distanceTo = start.distanceToSqr(rayTrace);
+ if (distanceTo < distance || distance == 0.0D) {
+ result = new EntityHitResult(entity, rayTrace);
+ distance = distanceTo;
+ }
+ }
+ }
+
+ return result;
+ }
+
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public int shieldBlockingDelay = this.level().paperConfig().misc.shieldBlockingDelay;
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public int getShieldBlockingDelay() {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
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index f58c9edd68b02bbca10897320fae63cee1562fe3..9a159f0c7489d2924dabe3fd250d844899ae5761 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -1,5 +1,6 @@
package org.bukkit.craftbukkit.entity;
+import com.destroystokyo.paper.entity.TargetEntityInfo;
import com.google.common.base.Preconditions;
import com.google.common.collect.Sets;
import java.util.ArrayList;
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@@ -226,6 +227,39 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
}
return null;
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}
+
+ public Entity getTargetEntity(int maxDistance, boolean ignoreBlocks) {
+ net.minecraft.world.phys.EntityHitResult rayTrace = rayTraceEntity(maxDistance, ignoreBlocks);
+ return rayTrace == null ? null : rayTrace.getEntity().getBukkitEntity();
+ }
+
+ public TargetEntityInfo getTargetEntityInfo(int maxDistance, boolean ignoreBlocks) {
+ net.minecraft.world.phys.EntityHitResult rayTrace = rayTraceEntity(maxDistance, ignoreBlocks);
+ return rayTrace == null ? null : new TargetEntityInfo(rayTrace.getEntity().getBukkitEntity(), new org.bukkit.util.Vector(rayTrace.getLocation().x, rayTrace.getLocation().y, rayTrace.getLocation().z));
+ }
+
+ @Override
+ public RayTraceResult rayTraceEntities(int maxDistance, boolean ignoreBlocks) {
+ net.minecraft.world.phys.EntityHitResult rayTrace = this.rayTraceEntity(maxDistance, ignoreBlocks);
+ return rayTrace == null ? null : new org.bukkit.util.RayTraceResult(org.bukkit.craftbukkit.util.CraftVector.toBukkit(rayTrace.getLocation()), rayTrace.getEntity().getBukkitEntity());
+ }
+
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+ public net.minecraft.world.phys.EntityHitResult rayTraceEntity(int maxDistance, boolean ignoreBlocks) {
+ net.minecraft.world.phys.EntityHitResult rayTrace = getHandle().getTargetEntity(maxDistance);
+ if (rayTrace == null) {
+ return null;
+ }
+ if (!ignoreBlocks) {
+ net.minecraft.world.phys.HitResult rayTraceBlocks = getHandle().getRayTrace(maxDistance, net.minecraft.world.level.ClipContext.Fluid.NONE);
+ if (rayTraceBlocks != null) {
+ net.minecraft.world.phys.Vec3 eye = getHandle().getEyePosition(1.0F);
+ if (eye.distanceToSqr(rayTraceBlocks.getLocation()) <= eye.distanceToSqr(rayTrace.getLocation())) {
+ return null;
+ }
+ }
+ }
+ return rayTrace;
+ }
// Paper end
@Override