From f3b93549d5887c810ffcef064505f4598378ed83 Mon Sep 17 00:00:00 2001
From: mcmonkey4eva <mcmonkey4eva@hotmail.com>
Date: Thu, 2 Jul 2015 15:23:39 -0700
Subject: [PATCH] location.precise_impact_normal

---
 .../aufdemrand/denizen/objects/dLocation.java | 21 +++++++++++++++++++
 .../denizen/utilities/entity/Rotation.java    |  9 ++++++++
 2 files changed, 30 insertions(+)

diff --git a/src/main/java/net/aufdemrand/denizen/objects/dLocation.java b/src/main/java/net/aufdemrand/denizen/objects/dLocation.java
index dec2621d33..161dc290df 100644
--- a/src/main/java/net/aufdemrand/denizen/objects/dLocation.java
+++ b/src/main/java/net/aufdemrand/denizen/objects/dLocation.java
@@ -641,6 +641,27 @@ else if (type == Material.TRAP_DOOR
         //   DIRECTION ATTRIBUTES
         /////////////////
 
+        // <--[tag]
+        // @attribute <l@location.precise_impact_normal[<range>]>
+        // @returns dLocation
+        // @description
+        // Returns the exact impact normal at the location this location is pointing at.
+        // Optionally, specify a maximum range to find the location from.
+        // -->
+        if (attribute.startsWith("precise_impact_normal")) {
+            int range = attribute.getIntContext(1);
+            if (range < 1) range = 200;
+            double xzLen = Math.cos((getPitch() % 360) * (Math.PI / 180));
+            double nx = xzLen * Math.sin(-getYaw() * (Math.PI / 180));
+            double ny = Math.sin(getPitch() * (Math.PI / 180));
+            double nz = xzLen * Math.cos(getYaw() * (Math.PI / 180));
+            Location location = Rotation.getImpactNormal(this, new org.bukkit.util.Vector(nx, -ny, nz), range);
+            if (location != null)
+                return new dLocation(location).getAttribute(attribute.fulfill(1));
+            else
+                return null;
+        }
+
         // <--[tag]
         // @attribute <l@location.precise_cursor_on[<range>]>
         // @returns dLocation
diff --git a/src/main/java/net/aufdemrand/denizen/utilities/entity/Rotation.java b/src/main/java/net/aufdemrand/denizen/utilities/entity/Rotation.java
index 63210cd134..3a7eb6f0a0 100644
--- a/src/main/java/net/aufdemrand/denizen/utilities/entity/Rotation.java
+++ b/src/main/java/net/aufdemrand/denizen/utilities/entity/Rotation.java
@@ -143,6 +143,15 @@ public static Location rayTrace(Location start, Vector direction, double range)
         return null;
     }
 
+    public static Location getImpactNormal(Location start, Vector direction, double range) {
+        Vector startVec = start.toVector();
+        MovingObjectPosition l = rayTrace(start.getWorld(), startVec, startVec.clone().add(direction.multiply(range)));
+        if (l != null && l.direction != null) {
+            return new Location(start.getWorld(), l.direction.getAdjacentX(), l.direction.getAdjacentY(), l.direction.getAdjacentZ());
+        }
+        return null;
+    }
+
     /**
      * Gets the precise location a LivingEntity is looking at.
      *