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Add methods to find targets for lightning strikes (#6712)

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Jakub Žáček 2021-10-08 12:00:03 +02:00 committed by GitHub
parent 975f2e5104
commit b470400d5c
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3
build-data/paper.at
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@ -241,3 +241,6 @@ public net.minecraft.world.entity.projectile.Projectile ownerUUID
public org.bukkit.craftbukkit.scoreboard.CraftScoreboardTranslations
public org.bukkit.craftbukkit.scoreboard.CraftScoreboardTranslations toBukkitSlot(I)Lorg/bukkit/scoreboard/DisplaySlot;
public org.bukkit.craftbukkit.scoreboard.CraftScoreboardTranslations fromBukkitSlot(Lorg/bukkit/scoreboard/DisplaySlot;)I
# Add methods to find targets for lightning strikes
public net.minecraft.server.level.ServerLevel findLightningRod(Lnet/minecraft/core/BlockPos;)Ljava/util/Optional;

48
patches/api/0337-Add-methods-to-find-targets-for-lightning-strikes.patch Normal file
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@ -0,0 +1,48 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jakub Zacek <dawon@dawon.eu>
Date: Mon, 4 Oct 2021 08:29:36 +0200
Subject: [PATCH] Add methods to find targets for lightning strikes
diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
index 77577de113b1413ed1474850b4ef8e7fd0c07dd6..4f673e9123145dc78564dc3eef0edf75795dafc2 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -757,6 +757,37 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
@NotNull
public LightningStrike strikeLightningEffect(@NotNull Location loc);
+ // Paper start
+ /**
+ * Finds the location of the nearest unobstructed Lightning Rod in a 128-block
+ * radius around the given location. Returns {@code null} if no Lightning Rod is found.
+ *
+ * <p>Note: To activate a Lightning Rod, the position one block above it must be struck by lightning.</p>
+ *
+ * @param location {@link Location} to search for Lightning Rod around
+ * @return {@link Location} of Lightning Rod or {@code null}
+ */
+ @Nullable
+ public Location findLightningRod(@NotNull Location location);
+
+ /**
+ * Finds a target {@link Location} for lightning to strike.
+ * <p>It selects from (in the following order):</p>
+ * <ol>
+ * <li>the block above the nearest Lightning Rod, found using {@link World#findLightningRod(Location)}</li>
+ * <li>a random {@link LivingEntity} that can see the sky in a 6x6 cuboid
+ * around input X/Z coordinates. Y ranges from <i>the highest motion-blocking
+ * block at the input X/Z - 3</i> to <i>the height limit + 3</i></li>
+ * </ol>
+ * <p>Returns {@code null} if no target is found.</p>
+ *
+ * @param location {@link Location} to search for target around
+ * @return lightning target or {@code null}
+ */
+ @Nullable
+ public Location findLightningTarget(@NotNull Location location);
+ // Paper end
+
/**
* Get a list of all entities in this World
*

58
patches/server/0821-Add-methods-to-find-targets-for-lightning-strikes.patch Normal file
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@ -0,0 +1,58 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jakub Zacek <dawon@dawon.eu>
Date: Mon, 4 Oct 2021 10:16:44 +0200
Subject: [PATCH] Add methods to find targets for lightning strikes
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 6911fbbd3a0b2aed7257e31433fc01fe8fade5ec..96ccf894519fc892e35fbd13ab97fe289236caca 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -956,6 +956,11 @@ public class ServerLevel extends Level implements WorldGenLevel {
}
protected BlockPos findLightningTargetAround(BlockPos pos) {
+ // Paper start
+ return this.findLightningTargetAround(pos, false);
+ }
+ public BlockPos findLightningTargetAround(BlockPos pos, boolean returnNullWhenNoTarget) {
+ // Paper end
BlockPos blockposition1 = this.getHeightmapPos(Heightmap.Types.MOTION_BLOCKING, pos);
Optional<BlockPos> optional = this.findLightningRod(blockposition1);
@@ -970,6 +975,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
if (!list.isEmpty()) {
return ((LivingEntity) list.get(this.random.nextInt(list.size()))).blockPosition();
} else {
+ if (returnNullWhenNoTarget) return null; // Paper
if (blockposition1.getY() == this.getMinBuildHeight() - 1) {
blockposition1 = blockposition1.above(2);
}
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 8c238a445b327e24d8152b36ebc2b1b57e73d0e1..00d8b61c04ac91770b0ff3b846d3ff70bef2e8e7 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -700,6 +700,23 @@ public class CraftWorld extends CraftRegionAccessor implements World {
return (LightningStrike) lightning.getBukkitEntity();
}
+ // Paper start
+ @Override
+ public Location findLightningRod(Location location) {
+ return this.world.findLightningRod(net.minecraft.server.MCUtil.toBlockPosition(location))
+ .map(blockPos -> net.minecraft.server.MCUtil.toLocation(this.world, blockPos)
+ // get the actual rod pos
+ .subtract(0, 1, 0))
+ .orElse(null);
+ }
+
+ @Override
+ public Location findLightningTarget(Location location) {
+ final BlockPos pos = this.world.findLightningTargetAround(net.minecraft.server.MCUtil.toBlockPosition(location), true);
+ return pos == null ? null : net.minecraft.server.MCUtil.toLocation(this.world, pos);
+ }
+ // Paper end
+
@Override
public boolean generateTree(Location loc, TreeType type) {
return generateTree(loc, CraftWorld.rand, type);