From d05bf9b489bbb2812871e5520923edf3aa6499b6 Mon Sep 17 00:00:00 2001
From: TenPlus1 <kinsellaja@yahoo.com>
Date: Sun, 8 Apr 2018 12:25:06 +0100
Subject: [PATCH] added simple smooth rotation (thanks ThomasMonroe)

---
 api.lua | 81 +++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 67 insertions(+), 14 deletions(-)

diff --git a/api.lua b/api.lua
index 285a905..f8a632e 100644
--- a/api.lua
+++ b/api.lua
@@ -145,15 +145,27 @@ end
 
 
 -- set and return valid yaw
-local set_yaw = function(self, yaw)
+local set_yaw = function(self, yaw, delay)
 
 	if not yaw or yaw ~= yaw then
 		yaw = 0
 	end
 
-	self:setyaw(yaw)
+	delay = delay or 0
 
-	return yaw
+	if delay == 0 then
+		self.object:set_yaw(yaw)
+		return yaw
+	end
+
+	self.target_yaw = yaw
+	self.delay = delay
+	return target_yaw
+end
+
+-- global function to set mob yaw
+function mobs:yaw(self, yaw, delay)
+	set_yaw(self, yaw, delay)
 end
 
 
@@ -1457,7 +1469,7 @@ local runaway_from = function(self)
 			yaw = yaw + pi
 		end
 
-		yaw = set_yaw(self.object, yaw)
+		yaw = set_yaw(self, yaw, 4)
 		self.state = "runaway"
 		self.runaway_timer = 3
 		self.following = nil
@@ -1543,7 +1555,7 @@ local follow_flop = function(self)
 
 				if p.x > s.x then yaw = yaw + pi end
 
-				yaw = set_yaw(self.object, yaw)
+				yaw = set_yaw(self, yaw, 6)
 
 				-- anyone but standing npc's can move along
 				if dist > self.reach
@@ -1647,7 +1659,7 @@ local do_states = function(self, dtime)
 				yaw = yaw + random(-0.5, 0.5)
 			end
 
-			yaw = set_yaw(self.object, yaw)
+			yaw = set_yaw(self, yaw, 8)
 		end
 
 		set_velocity(self, 0)
@@ -1721,7 +1733,7 @@ local do_states = function(self, dtime)
 					if lp.x > s.x then yaw = yaw + pi end
 
 					-- look towards land and jump/move in that direction
-					yaw = set_yaw(self.object, yaw)
+					yaw = set_yaw(self, yaw, 6)
 					do_jump(self)
 					set_velocity(self, self.walk_velocity)
 				else
@@ -1740,14 +1752,14 @@ local do_states = function(self, dtime)
 				if lp.x > s.x then yaw = yaw + pi end
 			end
 
-			yaw = set_yaw(self.object, yaw)
+			yaw = set_yaw(self, yaw, 8)
 
 		-- otherwise randomly turn
 		elseif random(1, 100) <= 30 then
 
 			yaw = yaw + random(-0.5, 0.5)
 
-			yaw = set_yaw(self.object, yaw)
+			yaw = set_yaw(self, yaw, 8)
 		end
 
 		-- stand for great fall in front
@@ -1813,6 +1825,7 @@ local do_states = function(self, dtime)
 			self.v_start = false
 			self.timer = 0
 			self.blinktimer = 0
+			self.path.way = nil
 
 			return
 		end
@@ -1828,7 +1841,7 @@ local do_states = function(self, dtime)
 
 			if p.x > s.x then yaw = yaw + pi end
 
-			yaw = set_yaw(self.object, yaw)
+			yaw = set_yaw(self, yaw)
 
 			local node_break_radius = self.explosion_radius or 1
 			local entity_damage_radius = self.explosion_damage_radius
@@ -2016,7 +2029,7 @@ local do_states = function(self, dtime)
 
 			if p.x > s.x then yaw = yaw + pi end
 
-			yaw = set_yaw(self.object, yaw)
+			yaw = set_yaw(self, yaw)
 
 			-- move towards enemy if beyond mob reach
 			if dist > self.reach then
@@ -2119,7 +2132,7 @@ local do_states = function(self, dtime)
 
 			if p.x > s.x then yaw = yaw + pi end
 
-			yaw = set_yaw(self.object, yaw)
+			yaw = set_yaw(self, yaw)
 
 			set_velocity(self, 0)
 
@@ -2445,7 +2458,7 @@ local mob_punch = function(self, hitter, tflp, tool_capabilities, dir)
 			yaw = yaw + pi
 		end
 
-		yaw = set_yaw(self.object, yaw)
+		yaw = set_yaw(self, yaw, 6)
 		self.state = "runaway"
 		self.runaway_timer = 0
 		self.following = nil
@@ -2665,7 +2678,7 @@ local mob_activate = function(self, staticdata, def, dtime)
 
 	-- set anything changed above
 	self.object:set_properties(self)
-	set_yaw(self.object, (random(0, 360) - 180) / 180 * pi)
+	set_yaw(self, (random(0, 360) - 180) / 180 * pi, 6)
 	update_tag(self)
 	set_animation(self, "stand")
 
@@ -2735,6 +2748,46 @@ local mob_step = function(self, dtime)
 
 	falling(self, pos)
 
+	-- smooth rotation by ThomasMonroe314
+
+	if self.delay and self.delay > 0 then
+
+		local yaw = self.object:get_yaw()
+
+		if self.delay == 1 then
+			yaw = self.target_yaw
+		else
+			local dif = abs(yaw - self.target_yaw)
+
+			if yaw > self.target_yaw then
+
+				if dif > pi then
+					dif = 2 * pi - dif -- need to add
+					yaw = yaw + dif / self.delay
+				else
+					yaw = yaw - dif / self.delay -- need to subtract
+				end
+
+			elseif yaw < self.target_yaw then
+
+				if dif > pi then
+					dif = 2 * pi - dif
+					yaw = yaw - dif / self.delay -- need to subtract
+				else
+					yaw = yaw + dif / self.delay -- need to add
+				end
+			end
+
+			if yaw > (pi * 2) then yaw = yaw - (pi * 2) end
+			if yaw < 0 then yaw = yaw + (pi * 2) end
+		end
+
+		self.delay = self.delay - 1
+		self.object:set_yaw(yaw)
+	end
+
+	-- end rotation
+
 	-- knockback timer
 	if self.pause_timer > 0 then