add tag location.face returns dLocation

src/main/java/net/aufdemrand/denizen/objects/dLocation.java

@@ -748,6 +748,22 @@ else if (type == Material.TRAP_DOOR
             }
         }
 
+        // <--[tag]
+        // @attribute <l@location.face[<location>]>
+        // @returns dLocation
+        // @description
+        // Returns a location containing a yaw/pitch that point from the current location
+        // to the target location.
+        // -->
+        if (attribute.startsWith("face")
+                && attribute.hasContext(1)) {
+            Location two = dLocation.valueOf(attribute.getContext(1));
+            Location rel = Rotation.faceLocation(this, two);
+            if (rel != null) {
+                return new dLocation(rel).getAttribute(attribute.fulfill(1));
+            }
+        }
+
         // <--[tag]
         // @attribute <l@location.facing[<entity>/<location>]>
         // @returns Element(Boolean)

src/main/java/net/aufdemrand/denizen/utilities/entity/Rotation.java

@@ -169,6 +169,28 @@ public static Location eyeTrace(LivingEntity from, double range) {
     }
 
 
+    public static Location faceLocation(Location from, Location at) {
+        if (from.getWorld() != at.getWorld()) return null;
+        Location loc = from.getBlock().getLocation().clone().add(0.5, 0.5, 0.5);
+
+        double xDiff = at.getX() - loc.getX();
+        double yDiff = at.getY() - loc.getY();
+        double zDiff = at.getZ() - loc.getZ();
+
+        double distanceXZ = Math.sqrt(xDiff * xDiff + zDiff * zDiff);
+        double distanceY = Math.sqrt(distanceXZ * distanceXZ + yDiff * yDiff);
+
+        double yaw = Math.toDegrees(Math.acos(xDiff / distanceXZ));
+        double pitch = Math.toDegrees(Math.acos(yDiff / distanceY)) - 70;
+
+        if (zDiff < 0.0) {
+            yaw = yaw + (Math.abs(180 - yaw) * 2);
+        }
+
+        return new Location(from.getWorld(), from.getX(), from.getY(), from.getZ(), (float)yaw - 90, (float)pitch);
+    }
+
+
     /**
      * Changes an entity's yaw and pitch to make it face a location.
      *