Mineclonia/mods/boat/init.lua

--
-- Helper functions
--

local function is_water(pos)
	local nn = minetest.get_node(pos).name
	return minetest.get_item_group(nn, "water") ~= 0
end

local function get_velocity(v, yaw, y)
	local x = -math.sin(yaw)*v
	local z = math.cos(yaw)*v
	return {x=x, y=y, z=z}
end

--
-- boat entity
--
local boat = {
	physical = true,
	collisionbox = {-1,-0.5,-1, 1,0.5,1},
	visual = "mesh",
	mesh = "boat_base.x",
	textures = {"boat_texture.png"},
	driver = nil,
	v = 0,
	stepcount = 0,
	unattended = 0
}

function boat.on_rightclick(self, clicker)
	if not clicker or not clicker:is_player() then
		return
	end
	if self.driver and clicker == self.driver then
		self.driver = nil
		clicker:set_detach()
	elseif not self.driver then
		self.driver = clicker
		clicker:set_attach(self.object, "", {x=0,y=5,z=0}, {x=0,y=0,z=0})
		self.object:setyaw(clicker:get_look_yaw())
	end
end

function boat.on_activate(self, staticdata, dtime_s)
	self.object:set_armor_groups({immortal=1})
	if staticdata then
		self.v = tonumber(staticdata)
	end
end

function boat.get_staticdata()
	return tostring(v)
end

function boat.on_punch(self, puncher, time_from_last_punch, tool_capabilities, direction)

	 if self.driver then
		self.driver:set_detach()
		self.driver = nil
		boat.schedule_removal(self)
		if not minetest.setting_getbool("creative_mode") then
			puncher:get_inventory():add_item("main", "boat:boat")
		end
	else

		boat.schedule_removal(self)
		if not minetest.setting_getbool("creative_mode") then
			puncher:get_inventory():add_item("main", "boat:boat")
		end
	
	end
end

function boat.on_step(self, dtime)

	self.stepcount=self.stepcount+1
	if self.stepcount>9 then
	
		self.stepcount=0
		
		if self.driver then
			local ctrl = self.driver:get_player_control()

			self.unattended=0
		
			local yaw = self.object:getyaw()

			if ctrl.up and self.v<3 then
				self.v = self.v + 1
			end
			
			if ctrl.down and self.v>=-1 then
				self.v = self.v - 1
			end	
			
			if ctrl.left then
				if ctrl.down then
					self.object:setyaw(yaw-math.pi/12-dtime*math.pi/12)
				else
					self.object:setyaw(yaw+math.pi/12+dtime*math.pi/12)
				end
			end
			if ctrl.right then
				if ctrl.down then
					self.object:setyaw(yaw+math.pi/12+dtime*math.pi/12)
				else
					self.object:setyaw(yaw-math.pi/12-dtime*math.pi/12)
				end
			end
		end

		local tmp_velocity = get_velocity(self.v, self.object:getyaw(), 0)

		local tmp_pos = self.object:getpos()

		tmp_velocity.y=0

		if is_water(tmp_pos) then
			tmp_velocity.y=2
		end

		tmp_pos.y=tmp_pos.y-0.5

		if minetest.get_node(tmp_pos).name=="air" then
			tmp_velocity.y=-2
		end

		self.object:setvelocity(tmp_velocity)

	end
	
end

function boat.schedule_removal(self)

	minetest.after(0.25,function()
		self.object:remove()
	end)

end


minetest.register_entity("boat:boat", boat)

minetest.register_craftitem("boat:boat", {
	description = "Boat",
	inventory_image = "boat_inventory.png",
	liquids_pointable = true,

	on_place = function(itemstack, placer, pointed_thing)
		if pointed_thing.type ~= "node" then
			return
		end
		if not is_water(pointed_thing.under) then
			return
		end
		pointed_thing.under.y = pointed_thing.under.y+0.5
		minetest.add_entity(pointed_thing.under, "boat:boat")
		if not minetest.setting_getbool("creative_mode") then
			itemstack:take_item()
		end
		return itemstack
	end,
})

minetest.register_craft({
	output = "boat:boat",
	recipe = {
		{"", "", ""},
		{"", "", ""},
		{"default:wood", "", ""},
	},
})

minetest.debug("[boat] Mod loaded")