PaperMC/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/EntityLiving.java b/src/main/java/net/minecraft/world/entity/EntityLiving.java
index a530f13526ef1ee947adb22e24d5c9afb705a01d..bfbfdeffe668ac3363ffdab2c5cb7b19217f55ea 100644
--- a/src/main/java/net/minecraft/world/entity/EntityLiving.java
+++ b/src/main/java/net/minecraft/world/entity/EntityLiving.java
@@ -3608,6 +3608,23 @@ public abstract class EntityLiving extends Entity {
         this.broadcastItemBreak(enumhand == EnumHand.MAIN_HAND ? EnumItemSlot.MAINHAND : EnumItemSlot.OFFHAND);
     }
     // Paper start
+    public MovingObjectPosition getRayTrace(int maxDistance) {
+        return getRayTrace(maxDistance, RayTrace.FluidCollisionOption.NONE);
+    }
+
+    public MovingObjectPosition getRayTrace(int maxDistance, RayTrace.FluidCollisionOption fluidCollisionOption) {
+        if (maxDistance < 1 || maxDistance > 120) {
+            throw new IllegalArgumentException("maxDistance must be between 1-120");
+        }
+
+        Vec3D start = new Vec3D(locX(), locY() + getHeadHeight(), locZ());
+        org.bukkit.util.Vector dir = getBukkitEntity().getLocation().getDirection().multiply(maxDistance);
+        Vec3D end = new Vec3D(start.x + dir.getX(), start.y + dir.getY(), start.z + dir.getZ());
+        RayTrace raytrace = new RayTrace(start, end, RayTrace.BlockCollisionOption.OUTLINE, fluidCollisionOption, this);
+
+        return world.rayTrace(raytrace);
+    }
+
     public int shieldBlockingDelay = world.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 a0b006f24829ff9f5754293fbe389d19a14dc001..194583522c53ae838dfc0ccfa49f906c1a628984 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.EntityPlayer;
 import net.minecraft.world.EnumHand;
 import net.minecraft.world.damagesource.DamageSource;
@@ -40,6 +42,8 @@ import net.minecraft.world.entity.projectile.EntityThrownExpBottle;
 import net.minecraft.world.entity.projectile.EntityThrownTrident;
 import net.minecraft.world.entity.projectile.EntityTippedArrow;
 import net.minecraft.world.entity.projectile.EntityWitherSkull;
+import net.minecraft.world.phys.MovingObjectPosition;
+import net.minecraft.world.phys.MovingObjectPositionBlock;
 import org.apache.commons.lang.Validate;
 import org.bukkit.FluidCollisionMode;
 import org.bukkit.Location;
@@ -49,6 +53,7 @@ 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;
@@ -202,6 +207,28 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         return blocks.get(0);
     }
 
+    // Paper start
+    @Override
+    public Block getTargetBlock(int maxDistance, TargetBlockInfo.FluidMode fluidMode) {
+        MovingObjectPosition rayTrace = getHandle().getRayTrace(maxDistance, MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof MovingObjectPositionBlock) ? null : CraftBlock.at(getHandle().world, ((MovingObjectPositionBlock)rayTrace).getBlockPosition());
+    }
+
+    @Override
+    public org.bukkit.block.BlockFace getTargetBlockFace(int maxDistance, TargetBlockInfo.FluidMode fluidMode) {
+        MovingObjectPosition rayTrace = getHandle().getRayTrace(maxDistance, MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof MovingObjectPositionBlock) ? null : MCUtil.toBukkitBlockFace(((MovingObjectPositionBlock)rayTrace).getDirection());
+    }
+
+    @Override
+    public TargetBlockInfo getTargetBlockInfo(int maxDistance, TargetBlockInfo.FluidMode fluidMode) {
+        MovingObjectPosition rayTrace = getHandle().getRayTrace(maxDistance, MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof MovingObjectPositionBlock) ? null :
+            new TargetBlockInfo(CraftBlock.at(getHandle().world, ((MovingObjectPositionBlock)rayTrace).getBlockPosition()),
+                MCUtil.toBukkitBlockFace(((MovingObjectPositionBlock)rayTrace).getDirection()));
+    }
+    // Paper end
+
     @Override
     public List<Block> getLastTwoTargetBlocks(Set<Material> transparent, int maxDistance) {
         return getLineOfSight(transparent, maxDistance, 2);