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--
-- 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_sign(i)
if i == 0 then
return 0
else
return i/math.abs(i)
end
end
local function get_velocity(v, yaw, y)
local x = math.cos(yaw)*v
local z = math.sin(yaw)*v
return {x=x, y=y, z=z}
end
local function get_v(v)
return math.sqrt(v.x^2+v.z^2)
end
--
-- Cart entity
--
local boat = {
physical = true,
collisionbox = {-2.4,-1,-2.4, 2.4,2.0,2.4},
visual = "mesh",
visual_size = {x=2.0,y=2.0},
mesh = "barge.obj",
textures = {"prefab_concrete_boat.png"},
driver = nil,
v = 0,
}
function boat:on_rightclick(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(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(puncher, time_from_last_punch, tool_capabilities, direction)
self.object:remove()
if puncher and puncher:is_player() then
puncher:get_inventory():add_item("main", "prefab:boat")
end
end
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()
if ctrl.up then
self.v = self.v+0.03
end
if ctrl.down then
self.v = self.v-0.03
end
if ctrl.left then
self.object:setyaw(self.object:getyaw()+math.pi/120+dtime*math.pi/120)
end
if ctrl.right then
self.object:setyaw(self.object:getyaw()-math.pi/120-dtime*math.pi/120)
end
end
local s = get_sign(self.v)
self.v = self.v - 0.02*s
if s ~= get_sign(self.v) then
self.object:setvelocity({x=0, y=0, z=0})
self.v = 0
return
end
if math.abs(self.v) > 4.5 then
self.v = 4.5*get_sign(self.v)
end
local p = self.object:getpos()
p.y = p.y-0.5
if not is_water(p) then
if minetest.registered_nodes[minetest.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))
else
p.y = p.y+1
if is_water(p) then
self.object:setacceleration({x=0, y=3, z=0})
local y = self.object:getvelocity().y
if y > 2 then
y = 2
end
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))
else
self.object:setacceleration({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))
else
self.object:setvelocity(get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y))
end
end
end
end
minetest.register_entity("prefab:boat", boat)
minetest.register_craftitem("prefab:boat", {
description = "Prefab Concrete Barge",
inventory_image = "prefab_boat_inventory.png",
wield_scale = {x=2, y=2, z=1},
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, "prefab:boat")
itemstack:take_item()
return itemstack
end,
})
minetest.register_craft({
output = "prefab:boat",
recipe = {
{"", "", ""},
{"prefab:concrete_slab", "", "prefab:concrete_slab"},
{"prefab:concrete_slab", "prefab:concrete_slab", "prefab:concrete_slab"},
},
})
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