From 825d2eb3b84c72194294491432a5f3625315ed31 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Mon, 23 Feb 2015 15:54:17 -0600
Subject: [PATCH] PaperSpigot TNT Changes

PaperSpigot communal TNT modification patch
Original authors for individual changes are listed w/in PaperSpigotWorldConfig

diff --git a/src/main/java/net/minecraft/server/EntityTNTPrimed.java b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
index ddff5a8..7c94d99 100644
--- a/src/main/java/net/minecraft/server/EntityTNTPrimed.java
+++ b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
@@ -36,6 +36,12 @@ public class EntityTNTPrimed extends Entity {
         this.lastY = d1;
         this.lastZ = d2;
         this.source = entityliving;
+
+        // PaperSpigot start - Fix TNT directional bias
+        if (this.world.paperSpigotConfig.fixTNTDirectionBias) {
+            this.motX = this.motZ = 0;
+        }
+        // PaperSpigot end
     }
 
     protected void h() {}
@@ -63,6 +69,12 @@ public class EntityTNTPrimed extends Entity {
         }
         // PaperSpigot end
 
+        // PaperSpigot start - Configurable TNT Height Limit
+        if (this.world.paperSpigotConfig.tntHeightLimit != 0 && this.locY > this.world.paperSpigotConfig.tntHeightLimit) {
+            this.die();
+        }
+        // PaperSpigot end
+
         this.motX *= 0.9800000190734863D;
         this.motY *= 0.9800000190734863D;
         this.motZ *= 0.9800000190734863D;
@@ -97,7 +109,15 @@ public class EntityTNTPrimed extends Entity {
         server.getPluginManager().callEvent(event);
 
         if (!event.isCancelled()) {
-            this.world.createExplosion(this, this.locX, this.locY + (double) (this.length / 2.0F), this.locZ, event.getRadius(), event.getFire(), true);
+            // PaperSpigot start - Configurable legacy TNT explosion height
+            double locY = this.locY;
+
+            if (!this.world.paperSpigotConfig.legacyTNTExplosionHeight) {
+                locY += this.length / 2.0F;
+            }
+
+            this.world.createExplosion(this, this.locX, locY, this.locZ, event.getRadius(), event.getFire(), true);
+            // PaperSpigot end
         }
         // CraftBukkit end
     }
@@ -132,4 +152,12 @@ public class EntityTNTPrimed extends Entity {
     public float getHeadHeight() {
         return 0.0F;
     }
+
+    /**
+     * PaperSpigot - Configurable TNT water movement
+     */
+    @Override
+    public boolean aK() {
+        return world.paperSpigotConfig.tntMovesInWater;
+    }
 }
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index e4a1bb2..7bac43c 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1888,6 +1888,11 @@ public abstract class World implements IBlockAccess {
         double d1 = 1.0D / ((axisalignedbb.e - axisalignedbb.b) * 2.0D + 1.0D);
         double d2 = 1.0D / ((axisalignedbb.f - axisalignedbb.c) * 2.0D + 1.0D);
 
+        // PaperSpigot start - Fix TNT directional bias
+        double xOffset = (1.0 - Math.floor(1.0 / d0) * d0) / 2.0;
+        double zOffset = (1.0 - Math.floor(1.0 / d2) * d2) / 2.0;
+        // PaperSpigot end
+
         if (d0 >= 0.0D && d1 >= 0.0D && d2 >= 0.0D) {
             int i = 0;
             int j = 0;
@@ -1899,7 +1904,16 @@ public abstract class World implements IBlockAccess {
                         double d4 = axisalignedbb.b + (axisalignedbb.e - axisalignedbb.b) * (double) f1;
                         double d5 = axisalignedbb.c + (axisalignedbb.f - axisalignedbb.c) * (double) f2;
 
-                        if (this.rayTrace(new Vec3D(d3, d4, d5), vec3d) == null) {
+                        // PaperSpigot start - Fix TNT directional bias
+                        Vec3D vec3d1;
+                        if (this.paperSpigotConfig.fixTNTDirectionBias) {
+                            vec3d1 = new Vec3D(xOffset, d4, zOffset + d5);
+                        } else {
+                            vec3d1 = new Vec3D(d3, d4, d5);
+                        }
+
+                        if (this.rayTrace(vec3d1, vec3d) == null) {
+                        // PaperSpigot end
                             ++i;
                         }
 
diff --git a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
index a756395..b2d8a03 100644
--- a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
+++ b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
@@ -191,4 +191,36 @@ public class PaperSpigotWorldConfig
     {
         netherVoidTopDamage = getBoolean( "nether-ceiling-void-damage", false );
     }
+
+    public boolean fixTNTDirectionBias;
+    public boolean tntMovesInWater;
+    public boolean legacyTNTExplosionHeight;
+    public int tntHeightLimit;
+    private void tntChanges()
+    {
+        // Original Authors: Iceee <andrew@opticgaming.tv> and Jedediah Smith <jedediah@silencegreys.com>
+        fixTNTDirectionBias = getBoolean( "tnt-gameplay.fix-directional-bias", false );
+        // Original Author: Byteflux <byte@byteflux.net>
+        tntMovesInWater = getBoolean( "tnt-gameplay.moves-in-water", true );
+        // Original Author: Byteflux <byte@byteflux.net>
+        legacyTNTExplosionHeight = getBoolean( "tnt-gameplay.legacy-explosion-height", false );
+        // Original Author: Somebody \o/
+        tntHeightLimit = getInt( "tnt-gameplay.tnt-entity-height-limit", 0 );
+
+        log( "Fix TNT directional bias: " + fixTNTDirectionBias );
+        log( "TNT moves in water: " + tntMovesInWater );
+        log( "Use legacy TNT explosion height " + legacyTNTExplosionHeight );
+        if ( tntHeightLimit != 0 ) {
+            log( "TNT height limit set at " + tntHeightLimit );
+        } else {
+            log( "TNT height limit disabled" );
+        }
+
+        if (PaperSpigotConfig.version < 7) {
+            System.err.println( "==========================================" );
+            System.err.println( "   Many TNT Related Settings Have Moved   " );
+            System.err.println( "  Please check your config in paper.yml!  " );
+            System.err.println( "==========================================" );
+        }
+    }
 }
-- 
1.9.5.msysgit.0