From ee7c23774b46b929e07932d07d5a70fd7c26c446 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 15 Aug 2017 22:29:12 -0400
Subject: [PATCH] Expand World.spawnParticle API and add Builder

Adds ability to control who receives it and who is the source/sender (vanish API)
the standard API is to send the packet to everyone in the world, which is ineffecient.
Adds an option to control the force mode of the particle.

This adds a new Builder API which is much friendlier to use.

diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index c06158e0..49019d54 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -1399,12 +1399,17 @@ public class WorldServer extends World implements IAsyncTaskHandler {
         sendParticles(null, enumparticle, flag, d0, d1, d2, i, d3, d4, d5, d6, aint);
     }
 
+    // Paper start - Particle API Expansion
     public void sendParticles(EntityPlayer sender, EnumParticle enumparticle, boolean flag, double d0, double d1, double d2, int i, double d3, double d4, double d5, double d6, int... aint) {
+        sendParticles(this.players, sender, enumparticle, flag, d0, d1, d2, i, d3, d4, d5, d6, aint);
+    }
+    public void sendParticles(List<? extends EntityHuman> receivers, EntityPlayer sender, EnumParticle enumparticle, boolean flag, double d0, double d1, double d2, int i, double d3, double d4, double d5, double d6, int... aint) {
+        // Paper end
         // CraftBukkit end
         PacketPlayOutWorldParticles packetplayoutworldparticles = new PacketPlayOutWorldParticles(enumparticle, flag, (float) d0, (float) d1, (float) d2, (float) d3, (float) d4, (float) d5, (float) d6, i, aint);
 
-        for (int j = 0; j < this.players.size(); ++j) {
-            EntityPlayer entityplayer = (EntityPlayer) this.players.get(j);
+        for (EntityHuman entityhuman : receivers) { // Paper - Particle API Expansion
+            EntityPlayer entityplayer = (EntityPlayer) entityhuman; // Paper - Particle API Expansion
             if (sender != null && !entityplayer.getBukkitEntity().canSee(sender.getBukkitEntity())) continue; // CraftBukkit
             BlockPosition blockposition = entityplayer.getChunkCoordinates();
             double d7 = blockposition.distanceSquared(d0, d1, d2);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 568a50ec..ca8bda1c 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1568,15 +1568,18 @@ public class CraftWorld implements World {
         spawnParticle(particle, location.getX(), location.getY(), location.getZ(), count, offsetX, offsetY, offsetZ, extra, data);
     }
 
+    // Paper start - Particle API Expansion
     @Override
-    public <T> void spawnParticle(Particle particle, double x, double y, double z, int count, double offsetX, double offsetY, double offsetZ, double extra, T data) {
+    public <T> void spawnParticle(Particle particle, List<Player> receivers, Player sender, double x, double y, double z, int count, double offsetX, double offsetY, double offsetZ, double extra, T data, boolean force) {
+        // Paper end
         if (data != null && !particle.getDataType().isInstance(data)) {
             throw new IllegalArgumentException("data should be " + particle.getDataType() + " got " + data.getClass());
         }
         getHandle().sendParticles(
-                null, // Sender
+                receivers == null ? getHandle().players : receivers.stream().map(player -> ((CraftPlayer) player).getHandle()).collect(java.util.stream.Collectors.toList()), // Paper -  Particle API Expansion
+                sender != null ? ((CraftPlayer) sender).getHandle() : null, // Sender // Paper - Particle API Expansion
                 CraftParticle.toNMS(particle), // Particle
-                true, // Extended range
+                force , // Extended range // Paper - Particle API Expansion
                 x, y, z, // Position
                 count,  // Count
                 offsetX, offsetY, offsetZ, // Random offset
-- 
2.16.1.windows.1