From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sun, 5 Sep 2021 00:36:05 -0400
Subject: [PATCH] More Teleport API


diff --git a/src/main/java/io/papermc/paper/entity/LookAnchor.java b/src/main/java/io/papermc/paper/entity/LookAnchor.java
new file mode 100644
index 0000000000000000000000000000000000000000..7713a5b7e06da185685f18e79eae2c972e588696
--- /dev/null
+++ b/src/main/java/io/papermc/paper/entity/LookAnchor.java
@@ -0,0 +1,25 @@
+package io.papermc.paper.entity;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.LivingEntity;
+
+/**
+ * Represents what part of the entity should be used when determining where to face a location/entity.
+ *
+ * @see org.bukkit.entity.Player#lookAt(Location, LookAnchor)
+ * @see org.bukkit.entity.Player#lookAt(Entity, LookAnchor, LookAnchor)
+ */
+@org.jetbrains.annotations.ApiStatus.Experimental
+public enum LookAnchor {
+    /**
+     * Represents the entity's feet.
+     * @see LivingEntity#getLocation()
+     */
+    FEET,
+    /**
+     * Represents the entity's eyes.
+     * @see LivingEntity#getEyeLocation()
+     */
+    EYES;
+}
diff --git a/src/main/java/io/papermc/paper/entity/RelativeTeleportFlag.java b/src/main/java/io/papermc/paper/entity/RelativeTeleportFlag.java
new file mode 100644
index 0000000000000000000000000000000000000000..0426ee8bd71142b6f933a479c0f2e5ef6043147d
--- /dev/null
+++ b/src/main/java/io/papermc/paper/entity/RelativeTeleportFlag.java
@@ -0,0 +1,34 @@
+package io.papermc.paper.entity;
+
+import org.bukkit.Location;
+import org.bukkit.event.player.PlayerTeleportEvent;
+
+/**
+ * Represents coordinates in a teleportation that should be handled relatively.
+ *
+ * @see org.bukkit.entity.Player#teleport(Location, PlayerTeleportEvent.TeleportCause, boolean, boolean, RelativeTeleportFlag...)
+ */
+@org.jetbrains.annotations.ApiStatus.Experimental
+public enum RelativeTeleportFlag {
+    /**
+     * Represents the player's X coordinate
+     */
+    X,
+    /**
+     * Represents the player's Y coordinate
+     */
+    Y,
+    /**
+     * Represents the player's Z coordinate
+     */
+    Z,
+    /**
+     * Represents the player's yaw
+     */
+    YAW,
+    /**
+     * Represents the player's pitch
+     */
+    PITCH;
+
+}
diff --git a/src/main/java/org/bukkit/entity/Entity.java b/src/main/java/org/bukkit/entity/Entity.java
index 8bc6876c82935988436597161fa0ec94c032174b..03b35d3ba8ba00c0fa0272450f19355244a014ea 100644
--- a/src/main/java/org/bukkit/entity/Entity.java
+++ b/src/main/java/org/bukkit/entity/Entity.java
@@ -121,10 +121,77 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
      *
      * @param yaw the yaw
      * @param pitch the pitch
-     * @throws UnsupportedOperationException if used for players
      */
     public void setRotation(float yaw, float pitch);
 
+    // Paper start - Teleport API
+    /**
+     * Teleports this entity to the given location.
+     * <p>
+     * Note: Teleporting to a different world with ignorePassengers to true while the entity has entities riding it
+     * will cause this teleportation to return false and not occur.
+     *
+     * @param location New location to teleport this entity to
+     * @param ignorePassengers If all passengers should not be required to be removed prior to teleportation
+     * @return <code>true</code> if the teleport was successful
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    default boolean teleport(@NotNull Location location, boolean ignorePassengers) {
+        return this.teleport(location, TeleportCause.PLUGIN, ignorePassengers);
+    }
+
+    /**
+     * Teleports this entity to the given location.
+     * <p>
+     * Note: Teleporting to a different world with ignorePassengers to true while the entity has entities riding it
+     * will cause this teleportation to return false and not occur.
+     *
+     * @param location New location to teleport this entity to
+     * @param cause The cause of this teleportation
+     * @param ignorePassengers If all passengers should not be required to be removed prior to teleportation
+     * @return <code>true</code> if the teleport was successful
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    default boolean teleport(@NotNull Location location, @NotNull TeleportCause cause, boolean ignorePassengers) {
+        return this.teleport(location, cause, ignorePassengers, true);
+    }
+
+    /**
+     * Teleports this entity to the given location.
+     * <p>
+     * Note: Teleporting to a different world with ignorePassengers to true while the entity has entities riding it
+     * will cause this teleportation to return false and not occur.
+     * Note: Teleporting to a different world with dismount to false while this entity is riding another entity will
+     * cause this teleportation to return false and not occur.
+     *
+     * @param location New location to teleport this entity to
+     * @param ignorePassengers If all passengers should not be required to be removed prior to teleportation
+     * @param dismount If the entity should be dismounted if they are riding another entity
+     * @return <code>true</code> if the teleport was successful
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    default boolean teleport(@NotNull Location location, boolean ignorePassengers, boolean dismount) {
+        return this.teleport(location, TeleportCause.PLUGIN, ignorePassengers, dismount);
+    }
+
+    /**
+     * Teleports this entity to the given location.
+     * <p>
+     * Note: Teleporting to a different world with ignorePassengers to true while the entity has entities riding it
+     * will cause this teleportation to return false and not occur.
+     * Note: Teleporting to a different world with dismount to false while this entity is riding another entity will
+     * cause this teleportation to return false and not occur.
+     *
+     * @param location New location to teleport this entity to
+     * @param cause The cause of this teleportation
+     * @param ignorePassengers If all passengers should not be required to be removed prior to teleportation
+     * @param dismount If the entity should be dismounted if they are riding another entity
+     * @return <code>true</code> if the teleport was successful
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    boolean teleport(@NotNull Location location, @NotNull TeleportCause cause, boolean ignorePassengers, boolean dismount);
+    // Paper end - Teleport API
+
     /**
      * Teleports this entity to the given location. If this entity is riding a
      * vehicle, it will be dismounted prior to teleportation.
diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
index c0fc38cacf441273e8430dda31958c15a48fc9b6..b39afbcd1fa88a7f00cd5f4482d52f2d089497dc 100644
--- a/src/main/java/org/bukkit/entity/Player.java
+++ b/src/main/java/org/bukkit/entity/Player.java
@@ -2701,6 +2701,71 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
     String getClientBrandName();
     // Paper end
 
+    // Paper start - Teleport API
+    /**
+     * Sets the player's rotation.
+     *
+     * @param yaw the yaw
+     * @param pitch the pitch
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    void setRotation(float yaw, float pitch);
+
+    /**
+     * Teleports this entity to the given location.
+     * <p>
+     * Note: Teleporting to a different world with ignorePassengers to true while the entity has entities riding it
+     * will cause this teleportation to return false and not occur.
+     * Note: Teleporting to a different world with dismount to false while this entity is riding another entity will
+     * cause this teleportation to return false and not occur.
+     *
+     * <p>
+     * Relative teleportation flags are only used client side, and cause the player to not lose velocity in that
+     * specific coordinate. The location of the teleportation will not change.
+     *
+     * @param location New location to teleport this entity to
+     * @param cause The cause of this teleportation
+     * @param ignorePassengers If all passengers should not be required to be removed prior to teleportation
+     * @param dismount If the entity should be dismounted if they are riding another entity
+     * @param teleportFlags Coordinates of the location that the client should handle as relative teleportation
+     * @return <code>true</code> if the teleport was successful
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    boolean teleport(@NotNull Location location, @NotNull org.bukkit.event.player.PlayerTeleportEvent.TeleportCause cause, boolean ignorePassengers, boolean dismount, @NotNull io.papermc.paper.entity.RelativeTeleportFlag @NotNull... teleportFlags);
+
+    /**
+     * Causes the player to look towards the given position.
+     *
+     * @param x x coordinate
+     * @param y y coordinate
+     * @param z z coordinate
+     * @param playerAnchor What part of the player should face the given position
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    void lookAt(double x, double y, double z, @NotNull io.papermc.paper.entity.LookAnchor playerAnchor);
+
+    /**
+     * Causes the player to look towards the given location.
+     *
+     * @param location Location to look at
+     * @param playerAnchor What part of player should face the location
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    default void lookAt(@NotNull Location location, @NotNull io.papermc.paper.entity.LookAnchor playerAnchor) {
+        this.lookAt(location.getX(), location.getY(), location.getZ(), playerAnchor);
+    }
+
+    /**
+     * Causes the player to look towards the given entity.
+     *
+     * @param entity Entity to look at
+     * @param playerAnchor What part of the player should face the entity
+     * @param entityAnchor What part of the entity the player should face
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    void lookAt(@NotNull org.bukkit.entity.Entity entity, @NotNull io.papermc.paper.entity.LookAnchor playerAnchor, @NotNull io.papermc.paper.entity.LookAnchor entityAnchor);
+    // Paper end - Teleport API
+
     @NotNull
     @Override
     Spigot spigot();
diff --git a/src/main/java/org/bukkit/event/player/PlayerTeleportEvent.java b/src/main/java/org/bukkit/event/player/PlayerTeleportEvent.java
index 553d7740489fe729166c8ca8ef8c7834db3663ad..5b9c750cc3fdbb21c0e16f9df7740cb1f916170a 100644
--- a/src/main/java/org/bukkit/event/player/PlayerTeleportEvent.java
+++ b/src/main/java/org/bukkit/event/player/PlayerTeleportEvent.java
@@ -13,8 +13,14 @@ public class PlayerTeleportEvent extends PlayerMoveEvent {
     private static final HandlerList handlers = new HandlerList();
     private TeleportCause cause = TeleportCause.UNKNOWN;
 
+    // Paper start - Teleport API
+    private boolean dismounted = true;
+    private final java.util.Set<io.papermc.paper.entity.RelativeTeleportFlag> teleportFlagSet;
+    // Paper end
+
     public PlayerTeleportEvent(@NotNull final Player player, @NotNull final Location from, @Nullable final Location to) {
         super(player, from, to);
+        teleportFlagSet = java.util.Collections.emptySet(); // Paper - Teleport API
     }
 
     public PlayerTeleportEvent(@NotNull final Player player, @NotNull final Location from, @Nullable final Location to, @NotNull final TeleportCause cause) {
@@ -23,6 +29,17 @@ public class PlayerTeleportEvent extends PlayerMoveEvent {
         this.cause = cause;
     }
 
+    // Paper start - Teleport API
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    public PlayerTeleportEvent(@NotNull final Player player, @NotNull final Location from, @Nullable final Location to, @NotNull final TeleportCause cause, boolean dismounted, @NotNull java.util.Set<io.papermc.paper.entity.@NotNull RelativeTeleportFlag> teleportFlagSet) {
+        super(player, from, to);
+
+        this.dismounted = dismounted;
+        this.teleportFlagSet = teleportFlagSet;
+        this.cause = cause;
+    }
+    // Paper end
+
     /**
      * Gets the cause of this teleportation event
      *
@@ -80,6 +97,30 @@ public class PlayerTeleportEvent extends PlayerMoveEvent {
         UNKNOWN;
     }
 
+    // Paper start - Teleport API
+    /**
+     * Gets if the player will be dismounted in this teleportation.
+     *
+     * @return dismounted or not
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    public boolean willDismountPlayer() {
+        return this.dismounted;
+    }
+
+    /**
+     * Returns the relative teleportation flags used in this teleportation.
+     * This determines which axis the player will not lose their velocity in.
+     *
+     * @return an immutable set of relative teleportation flags
+     */
+    @org.jetbrains.annotations.ApiStatus.Experimental
+    @NotNull
+    public java.util.Set<io.papermc.paper.entity.@NotNull RelativeTeleportFlag> getRelativeTeleportationFlags() {
+        return this.teleportFlagSet;
+    }
+    // Paper end
+
     @NotNull
     @Override
     public HandlerList getHandlers() {