From 5a2773ea1abb6c8706c477802aae2fa60704714c Mon Sep 17 00:00:00 2001
From: jordan4ibanez <jordan4ibanez@users.noreply.github.com>
Date: Sun, 25 Apr 2021 17:48:41 -0400
Subject: [PATCH] Add in basics of head code yaw

---
 .../mcl_mobs/api/mob_functions/ai.lua         |  8 +-
 .../mcl_mobs/api/mob_functions/head_logic.lua | 86 ++++++++++++++++++-
 2 files changed, 87 insertions(+), 7 deletions(-)

diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
index bb54f5b95..5ecb7c4fb 100644
--- a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
+++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
@@ -833,13 +833,13 @@ mobs.mob_step = function(self, dtime)
 
 	--DEBUG TIME!
 
-	--mobs.do_head_logic(self,dtime)
+	mobs.do_head_logic(self,dtime)
 
 
 
-	--if true then--DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG
-	--	return
-	--end
+	if true then--DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG
+		return
+	end
 
 	--despawn mechanism
 	--don't despawned tamed or bred mobs
diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/head_logic.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/head_logic.lua
index a294f5528..f4fc5e56d 100644
--- a/mods/ENTITIES/mcl_mobs/api/mob_functions/head_logic.lua
+++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/head_logic.lua
@@ -1,12 +1,67 @@
 local vector_new = vector.new
 
+
+--converts yaw to degrees
+local degrees = function(yaw)
+	return(yaw*180.0/math.pi)
+end
+
+
 mobs.do_head_logic = function(self,dtime)
 
-    --local yaw = self.object:get_yaw()
+    local player = minetest.get_player_by_name("singleplayer")
+
+    local look_at = player:get_pos()
+    look_at.y = look_at.y + player:get_properties().eye_height
 
 
 
-    --local bone_pos = vector_new(0,5,0)
+
+    local pos = self.object:get_pos()
+
+    local body_yaw = self.object:get_yaw()
+
+    local body_dir = minetest.yaw_to_dir(body_yaw)
+
+
+    --needs to be INTERNAL(API)
+    self.head_height_offset = 1.0525
+
+    pos.y = pos.y + self.head_height_offset
+
+    --needs to be INTERNAL (API)
+    self.head_direction_offset = 0.5
+
+    local head_offset = vector.multiply(body_dir, self.head_direction_offset)
+
+    pos = vector.add(pos, head_offset)
+
+
+
+
+    minetest.add_particle({
+    	pos = pos,
+    	velocity = {x=0, y=0, z=0},
+    	acceleration = {x=0, y=0, z=0},
+    	expirationtime = 0.2,
+    	size = 1,
+    	texture = "default_dirt.png",
+    })
+
+
+    local bone_pos = vector_new(0,0,0)
+
+
+    --needs to be INTERNAL (API)
+    --(horizontal)
+    self.head_bone_pos_y = 3.6
+    bone_pos.y = self.head_bone_pos_y
+
+    
+    --needs to be INTERNAL (API)
+    --(vertical)
+    self.head_bone_pos_z = -0.6
+    bone_pos.z = self.head_bone_pos_z
 
     --print(yaw)
 
@@ -15,7 +70,32 @@ mobs.do_head_logic = function(self,dtime)
     --bone_rot.x = bone_rot.x + (dtime * 10)
     --bone_rot.z = bone_rot.z + (dtime * 10)
 
-    --self.object:set_bone_position("head", bone_pos, bone_rot)
+    local head_yaw
+
+    head_yaw = minetest.dir_to_yaw(vector.direction(pos,look_at)) - body_yaw
+
+
+    --over rotation protection
+    --stops radians from going out of spec
+    if head_yaw > math.pi then
+        head_yaw = head_yaw - (math.pi * 2)
+    elseif head_yaw < -math.pi then
+        head_yaw = head_yaw + (math.pi * 2)
+    end
+
+
+    --upper check
+    if head_yaw > math.pi - (math.pi/2) then
+        head_yaw = 0
+    --lower check
+    elseif head_yaw < -math.pi + (math.pi/2) then
+        head_yaw = 0
+    end
+
+    
+
+
+    self.object:set_bone_position("head", bone_pos, vector_new(0,0,degrees(head_yaw)))