PaperMC/Remapped-Spigot-Server-Patches/0277-Add-ray-tracing-methods-to-LivingEntity.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Mon, 3 Sep 2018 18:20:03 -0500
Subject: [PATCH] Add ray tracing methods to LivingEntity


diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 205c639d26652befebae925fc6e40976c370710f..2e25cb2a04d150d3154bf0d7f0eccb97e65ff53e 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3605,6 +3605,23 @@ public abstract class LivingEntity extends Entity {
         this.broadcastBreakEvent(hand == InteractionHand.MAIN_HAND ? EquipmentSlot.MAINHAND : EquipmentSlot.OFFHAND);
     }
     // Paper start
+    public HitResult getRayTrace(int maxDistance) {
+        return getRayTrace(maxDistance, ClipContext.Fluid.NONE);
+    }
+
+    public HitResult getRayTrace(int maxDistance, ClipContext.Fluid fluidCollisionOption) {
+        if (maxDistance < 1 || maxDistance > 120) {
+            throw new IllegalArgumentException("maxDistance must be between 1-120");
+        }
+
+        Vec3 start = new Vec3(getX(), getY() + getEyeHeight(), getZ());
+        org.bukkit.util.Vector dir = getBukkitEntity().getLocation().getDirection().multiply(maxDistance);
+        Vec3 end = new Vec3(start.x + dir.getX(), start.y + dir.getY(), start.z + dir.getZ());
+        ClipContext raytrace = new ClipContext(start, end, ClipContext.Block.OUTLINE, fluidCollisionOption, this);
+
+        return level.clip(raytrace);
+    }
+
     public int shieldBlockingDelay = level.paperConfig.shieldBlockingDelay;
 
     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
index 6dd7a722e10a2727f68318b880f2726bb816f198..7e3a215f1592bed9f35e22076d9e35a5a49a430e 100644
--- 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.block.TargetBlockInfo;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Sets;
 import java.util.ArrayList;
@@ -8,6 +9,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 import java.util.UUID;
+import net.minecraft.server.MCUtil;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.damagesource.DamageSource;
@@ -28,6 +30,8 @@ import net.minecraft.world.entity.projectile.ThrownEgg;
 import net.minecraft.world.entity.projectile.ThrownEnderpearl;
 import net.minecraft.world.entity.projectile.ThrownExperienceBottle;
 import net.minecraft.world.entity.projectile.ThrownTrident;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraft.world.phys.HitResult;
 import org.apache.commons.lang.Validate;
 import org.bukkit.FluidCollisionMode;
 import org.bukkit.Location;
@@ -37,6 +41,7 @@ import org.bukkit.attribute.AttributeInstance;
 import org.bukkit.block.Block;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.block.CraftBlock;
 import org.bukkit.craftbukkit.entity.memory.CraftMemoryKey;
 import org.bukkit.craftbukkit.entity.memory.CraftMemoryMapper;
 import org.bukkit.craftbukkit.inventory.CraftEntityEquipment;
@@ -190,6 +195,28 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         return blocks.get(0);
     }
 
+    // Paper start
+    @Override
+    public Block getTargetBlock(int maxDistance, TargetBlockInfo.FluidMode fluidMode) {
+        HitResult rayTrace = getHandle().getRayTrace(maxDistance, MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof BlockHitResult) ? null : CraftBlock.at(getHandle().level, ((BlockHitResult)rayTrace).getBlockPos());
+    }
+
+    @Override
+    public org.bukkit.block.BlockFace getTargetBlockFace(int maxDistance, TargetBlockInfo.FluidMode fluidMode) {
+        HitResult rayTrace = getHandle().getRayTrace(maxDistance, MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof BlockHitResult) ? null : MCUtil.toBukkitBlockFace(((BlockHitResult)rayTrace).getDirection());
+    }
+
+    @Override
+    public TargetBlockInfo getTargetBlockInfo(int maxDistance, TargetBlockInfo.FluidMode fluidMode) {
+        HitResult rayTrace = getHandle().getRayTrace(maxDistance, MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof BlockHitResult) ? null :
+            new TargetBlockInfo(CraftBlock.at(getHandle().level, ((BlockHitResult)rayTrace).getBlockPos()),
+                MCUtil.toBukkitBlockFace(((BlockHitResult)rayTrace).getDirection()));
+    }
+    // Paper end
+
     @Override
     public List<Block> getLastTwoTargetBlocks(Set<Material> transparent, int maxDistance) {
         return getLineOfSight(transparent, maxDistance, 2);