Paper/patches/api/0301-Add-more-line-of-sight-methods.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: TwoLeggedCat <80929284+TwoLeggedCat@users.noreply.github.com>
Date: Sat, 29 May 2021 14:33:18 -0500
Subject: [PATCH] Add more line of sight methods


diff --git a/src/main/java/org/bukkit/RegionAccessor.java b/src/main/java/org/bukkit/RegionAccessor.java
index aa534b1a9a1fb84a2fbd4b372f313bb4b63325fa..43b53c21af01e0f496c8aaacff82dfdfadaf40f6 100644
--- a/src/main/java/org/bukkit/RegionAccessor.java
+++ b/src/main/java/org/bukkit/RegionAccessor.java
@@ -392,5 +392,13 @@ public interface RegionAccessor extends Keyed { // Paper
     @NotNull
     @Override
     NamespacedKey getKey();
+
+    /**
+     * Tell whether a line of sight exists between the given locations
+     * @param from Location to start at
+     * @param to target Location
+     * @return whether a line of sight exists between {@code from} and {@code to}
+     */
+    public boolean lineOfSightExists(@NotNull Location from, @NotNull Location to);
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/entity/LivingEntity.java b/src/main/java/org/bukkit/entity/LivingEntity.java
index cc61e030f1bdb4d1ef52a0a1ae4983f95d2460fd..9ab91154c74b5a3001cf4d5df1b4ae1e26508b60 100644
--- a/src/main/java/org/bukkit/entity/LivingEntity.java
+++ b/src/main/java/org/bukkit/entity/LivingEntity.java
@@ -546,6 +546,19 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
      */
     public boolean hasLineOfSight(@NotNull Entity other);
 
+    // Paper start
+    /**
+     * Checks whether the living entity has block line of sight to the given block.
+     * <p>
+     * This uses the same algorithm that hostile mobs use to find the closest
+     * player.
+     *
+     * @param location the location to determine line of sight to
+     * @return true if there is a line of sight, false if not
+     */
+    public boolean hasLineOfSight(@NotNull Location location);
+    // Paper end
+
     /**
      * Returns if the living entity despawns when away from players or not.
      * <p>