Rework throwing code, add egg

mods/mcl_throwing/throwable.lua

@@ -0,0 +1,78 @@
+-- 
+-- Snowballs
+--
+
+local GRAVITY = 9.81
+local snowball_VELOCITY=19
+local egg_VELOCITY=19
+
+--Shoot snowball.
+local throw_function = function (entity_name, velocity)
+	local func = function(item, player, pointed_thing)
+		local playerpos=player:getpos()
+		local obj=minetest.add_entity({x=playerpos.x,y=playerpos.y+1.5,z=playerpos.z}, entity_name)
+		local dir=player:get_look_dir()
+		obj:setvelocity({x=dir.x*velocity, y=dir.y*velocity, z=dir.z*velocity})
+		obj:setacceleration({x=dir.x*-3, y=-GRAVITY, z=dir.z*-3})
+		item:take_item()
+		return item
+	end
+	return func
+end
+
+-- The snowball entity
+local snowball_ENTITY={
+	physical = false,
+	timer=0,
+	textures = {"mcl_throwing_snowball.png"},
+	lastpos={},
+	collisionbox = {0,0,0,0,0,0},
+}
+local egg_ENTITY={
+	physical = false,
+	timer=0,
+	textures = {"mcl_throwing_egg.png"},
+	lastpos={},
+	collisionbox = {0,0,0,0,0,0},
+}
+
+-- Snowball_entity.on_step()--> called when snowball is moving.
+local on_step = function(self, dtime)
+	self.timer=self.timer+dtime
+	local pos = self.object:getpos()
+	local node = minetest.get_node(pos)
+
+	--Become item when hitting a node.
+	if self.lastpos.x~=nil then --If there is no lastpos for some reason.
+		if node.name ~= "air" then
+			self.object:remove()
+		end
+	end
+	self.lastpos={x=pos.x, y=pos.y, z=pos.z} -- Set lastpos-->Node will be added at last pos outside the node
+end
+
+minetest.register_entity("mcl_throwing:snowball_entity", snowball_ENTITY)
+minetest.register_entity("mcl_throwing:egg_entity", egg_ENTITY)
+
+-- Snowball
+minetest.register_craftitem("mcl_throwing:snowball", {
+	description = "Snowball",
+	inventory_image = "mcl_throwing_snowball.png",
+	stack_max = 16,
+	on_use = throw_function("mcl_throwing:snowball_entity", snowball_VELOCITY),
+	groups = { weapon_ranged = 1 },
+	on_construct = function(pos)
+	pos.y = pos.y - 1
+		if minetest.get_node(pos).name == "default:dirt_with_grass" then
+			minetest.set_node(pos, {name="default:dirt_with_snow"})
+		end
+	end,
+})
+
+minetest.register_craftitem("mcl_throwing:egg", {
+	description = "Egg",
+	inventory_image = "mcl_throwing_egg.png",
+	stack_max = 16,
+	on_use = throw_function("mcl_throwing:egg_entity", egg_VELOCITY),
+	groups = { weapon_ranged = 1 },
+})