minetest_game/mods/boats/init.lua

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--
-- Helper functions
--
local function is_water(pos)
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local nn = minetest.get_node(pos).name
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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.sin(yaw)*v
local z = math.cos(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
--
-- Boat entity
--
local boat = {
physical = true,
collisionbox = {-0.6,-0.4,-0.6, 0.6,0.3,0.6},
visual = "mesh",
mesh = "boat.x",
textures = {"default_wood.png"},
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driver = nil,
v = 0,
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last_v = 0,
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removed = false
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}
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function boat.on_rightclick(self, clicker)
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if not clicker or not clicker:is_player() then
return
end
local name = clicker:get_player_name()
if self.driver and clicker == self.driver then
self.driver = nil
clicker:set_detach()
default.player_attached[name] = false
default.player_set_animation(clicker, "stand" , 30)
elseif not self.driver then
self.driver = clicker
clicker:set_attach(self.object, "", {x=0,y=11,z=-3}, {x=0,y=0,z=0})
default.player_attached[name] = true
minetest.after(0.2, function()
default.player_set_animation(clicker, "sit" , 30)
end)
self.object:setyaw(clicker:get_look_yaw()-math.pi/2)
end
end
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function boat.on_activate(self, staticdata, dtime_s)
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self.object:set_armor_groups({immortal=1})
if staticdata then
self.v = tonumber(staticdata)
end
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self.last_v = self.v
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end
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function boat.get_staticdata()
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return tostring(v)
end
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function boat.on_punch(self, puncher, time_from_last_punch, tool_capabilities, direction)
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if not puncher or not puncher:is_player() or self.removed then
return
end
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puncher:set_detach()
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default.player_attached[puncher:get_player_name()] = false
self.removed = true
-- delay remove to ensure player is detached
minetest.after(0.1,function()
self.object:remove()
end)
if not minetest.setting_getbool("creative_mode") then
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puncher:get_inventory():add_item("main", "boats:boat")
end
end
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function boat.on_step(self, dtime)
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self.v = get_v(self.object:getvelocity())*get_sign(self.v)
if self.driver then
local ctrl = self.driver:get_player_control()
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local yaw = self.object:getyaw()
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if ctrl.up then
self.v = self.v+0.1
end
if ctrl.down then
self.v = self.v-0.08
end
if ctrl.left then
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if ctrl.down then
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self.object:setyaw(yaw-math.pi/120-dtime*math.pi/120)
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else
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self.object:setyaw(yaw+math.pi/120+dtime*math.pi/120)
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end
end
if ctrl.right then
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if ctrl.down then
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self.object:setyaw(yaw+math.pi/120+dtime*math.pi/120)
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else
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self.object:setyaw(yaw-math.pi/120-dtime*math.pi/120)
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end
end
end
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local velo = self.object:getvelocity()
if self.v == 0 and velo.x == 0 and velo.z == 0 then
return
end
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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
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local p = self.object:getpos()
p.y = p.y-0.5
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local new_velo = {x=0,y=0,z=0}
local new_acce = {x=0,y=0,z=0}
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if not is_water(p) then
if minetest.registered_nodes[minetest.env:get_node(p).name].walkable then
self.v = 0
end
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new_acce = {x=0, y=-10, z=0}
new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
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else
p.y = p.y+1
if is_water(p) then
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new_acce = {x=0, y=3, z=0}
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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
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new_velo = get_velocity(self.v, self.object:getyaw(), y)
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else
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new_acce = {x=0, y=0, z=0}
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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)
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new_velo = get_velocity(self.v, self.object:getyaw(), 0)
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else
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new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
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end
end
end
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self.object:setvelocity(new_velo)
self.object:setacceleration(new_acce)
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end
minetest.register_entity("boats:boat", boat)
minetest.register_craftitem("boats:boat", {
description = "Boat",
inventory_image = "boat_inventory.png",
wield_image = "boat_wield.png",
wield_scale = {x=2, y=2, z=1},
liquids_pointable = true,
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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
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minetest.add_entity(pointed_thing.under, "boats:boat")
if not minetest.setting_getbool("creative_mode") then
itemstack:take_item()
end
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return itemstack
end,
})
minetest.register_craft({
output = "boats:boat",
recipe = {
{"", "", ""},
{"group:wood", "", "group:wood"},
{"group:wood", "group:wood", "group:wood"},
},
})