From e0673908bf2e57691bed29121e4098d248e92a04 Mon Sep 17 00:00:00 2001
From: BlockMen <nmuelll@web.de>
Date: Tue, 1 Jul 2014 14:25:43 +0200
Subject: [PATCH] Update only moving boats

---
 mods/boats/init.lua | 43 ++++++++++++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 15 deletions(-)

diff --git a/mods/boats/init.lua b/mods/boats/init.lua
index e2da5c00..d5be6143 100644
--- a/mods/boats/init.lua
+++ b/mods/boats/init.lua
@@ -4,7 +4,7 @@
 --
 
 local function is_water(pos)
-	local nn = minetest.env:get_node(pos).name
+	local nn = minetest.get_node(pos).name
 	return minetest.get_item_group(nn, "water") ~= 0
 end
 
@@ -39,6 +39,7 @@ local boat = {
 	
 	driver = nil,
 	v = 0,
+	last_v = 0,
 }
 
 function boat:on_rightclick(clicker)
@@ -67,6 +68,7 @@ function boat:on_activate(staticdata, dtime_s)
 	if staticdata then
 		self.v = tonumber(staticdata)
 	end
+	self.last_v = self.v
 end
 
 function boat:get_staticdata()
@@ -75,7 +77,7 @@ end
 
 function boat:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
 	self.object:remove()
-	if puncher and puncher:is_player() then
+	if puncher and puncher:is_player() and not minetest.setting_getbool("creative_mode") then
 		puncher:get_inventory():add_item("main", "boats:boat")
 	end
 end
@@ -84,6 +86,7 @@ function boat:on_step(dtime)
 	self.v = get_v(self.object:getvelocity())*get_sign(self.v)
 	if self.driver then
 		local ctrl = self.driver:get_player_control()
+		local yaw = self.object:getyaw()
 		if ctrl.up then
 			self.v = self.v+0.1
 		end
@@ -92,19 +95,23 @@ function boat:on_step(dtime)
 		end
 		if ctrl.left then
 			if ctrl.down then 
-				self.object:setyaw(self.object:getyaw()-math.pi/120-dtime*math.pi/120)
+				self.object:setyaw(yaw-math.pi/120-dtime*math.pi/120)
 			else
-				self.object:setyaw(self.object:getyaw()+math.pi/120+dtime*math.pi/120)
+				self.object:setyaw(yaw+math.pi/120+dtime*math.pi/120)
 			end
 		end
 		if ctrl.right then
 			if ctrl.down then 
-				self.object:setyaw(self.object:getyaw()+math.pi/120+dtime*math.pi/120)
+				self.object:setyaw(yaw+math.pi/120+dtime*math.pi/120)
 			else
-				self.object:setyaw(self.object:getyaw()-math.pi/120-dtime*math.pi/120)
+				self.object:setyaw(yaw-math.pi/120-dtime*math.pi/120)
 			end
 		end
 	end
+	local velo = self.object:getvelocity()
+	if self.v == 0 and velo.x == 0 and velo.z == 0 then
+		return
+	end
 	local s = get_sign(self.v)
 	self.v = self.v - 0.02*s
 	if s ~= get_sign(self.v) then
@@ -118,16 +125,18 @@ function boat:on_step(dtime)
 	
 	local p = self.object:getpos()
 	p.y = p.y-0.5
+	local new_velo = {x=0,y=0,z=0}
+	local new_acce = {x=0,y=0,z=0}
 	if not is_water(p) then
 		if minetest.registered_nodes[minetest.env:get_node(p).name].walkable then
 			self.v = 0
 		end
-		self.object:setacceleration({x=0, y=-10, z=0})
-		self.object:setvelocity(get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y))
+		new_acce = {x=0, y=-10, z=0}
+		new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
 	else
 		p.y = p.y+1
 		if is_water(p) then
-			self.object:setacceleration({x=0, y=3, z=0})
+			new_acce = {x=0, y=3, z=0}
 			local y = self.object:getvelocity().y
 			if y > 2 then
 				y = 2
@@ -135,19 +144,21 @@ function boat:on_step(dtime)
 			if y < 0 then
 				self.object:setacceleration({x=0, y=10, z=0})
 			end
-			self.object:setvelocity(get_velocity(self.v, self.object:getyaw(), y))
+			new_velo = get_velocity(self.v, self.object:getyaw(), y)
 		else
-			self.object:setacceleration({x=0, y=0, z=0})
+			new_acce = {x=0, y=0, z=0}
 			if math.abs(self.object:getvelocity().y) < 1 then
 				local pos = self.object:getpos()
 				pos.y = math.floor(pos.y)+0.5
 				self.object:setpos(pos)
-				self.object:setvelocity(get_velocity(self.v, self.object:getyaw(), 0))
+				new_velo = get_velocity(self.v, self.object:getyaw(), 0)
 			else
-				self.object:setvelocity(get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y))
+				new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
 			end
 		end
 	end
+	self.object:setvelocity(new_velo)
+	self.object:setacceleration(new_acce)
 end
 
 minetest.register_entity("boats:boat", boat)
@@ -168,8 +179,10 @@ minetest.register_craftitem("boats:boat", {
 			return
 		end
 		pointed_thing.under.y = pointed_thing.under.y+0.5
-		minetest.env:add_entity(pointed_thing.under, "boats:boat")
-		itemstack:take_item()
+		minetest.add_entity(pointed_thing.under, "boats:boat")
+		if not minetest.setting_getbool("creative_mode") then
+			itemstack:take_item()
+		end
 		return itemstack
 	end,
 })