VoxeLibre/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua

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local math_pi = math.pi
local math_sin = math.sin
local math_cos = math.cos
local math_random = math.random
local HALF_PI = math_pi / 2
local DOUBLE_PI = math_pi * 2
-- localize vector functions
local vector_new = vector.new
local vector_length = vector.length
local vector_multiply = vector.multiply
local vector_distance = vector.distance
local minetest_yaw_to_dir = minetest.yaw_to_dir
local minetest_dir_to_yaw = minetest.dir_to_yaw
local DEFAULT_JUMP_HEIGHT = 5
local DEFAULT_FLOAT_SPEED = 4
--this is a generic float function
mobs.float = function(self)
local current_velocity = self.object:get_velocity()
local goal_velocity = {
x = 0,
y = DEFAULT_FLOAT_SPEED,
z = 0,
}
local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
new_velocity_addition.x = 0
new_velocity_addition.z = 0
--smooths out mobs a bit
if vector_length(new_velocity_addition) >= 0.0001 then
self.object:add_velocity(new_velocity_addition)
end
end
--[[
_ _
| | | |
| | __ _ _ __ __| |
| | / _` | '_ \ / _` |
| |___| (_| | | | | (_| |
\_____/\__,_|_| |_|\__,_|
]]
-- move mob in facing direction
--this has been modified to be internal
--internal = lua (self.yaw)
--engine = c++ (self.object:get_yaw())
mobs.set_velocity = function(self, v)
local yaw = (self.yaw or 0)
local current_velocity = self.object:get_velocity()
local goal_velocity = {
x = (math_sin(yaw) * -v),
y = 0,
z = (math_cos(yaw) * v),
}
local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
if vector_length(new_velocity_addition) > vector_length(goal_velocity) then
vector.multiply(new_velocity_addition, (vector_length(goal_velocity) / vector_length(new_velocity_addition)))
end
new_velocity_addition.y = 0
--smooths out mobs a bit
if vector_length(new_velocity_addition) >= 0.0001 then
self.object:add_velocity(new_velocity_addition)
end
end
-- calculate mob velocity
mobs.get_velocity = function(self)
local v = self.object:get_velocity()
v.y = 0
if v then
return vector_length(v)
end
return 0
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end
--make mobs jump
mobs.jump = function(self, velocity)
if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
return
end
--fallback velocity to allow modularity
velocity = velocity or DEFAULT_JUMP_HEIGHT
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self.object:add_velocity(vector_new(0,velocity,0))
end
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--make mobs fall slowly
mobs.mob_fall_slow = function(self)
local current_velocity = self.object:get_velocity()
local goal_velocity = {
x = 0,
y = -2,
z = 0,
}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
new_velocity_addition.x = 0
new_velocity_addition.z = 0
if vector_length(new_velocity_addition) > vector_length(goal_velocity) then
vector.multiply(new_velocity_addition, (vector_length(goal_velocity) / vector_length(new_velocity_addition)))
end
new_velocity_addition.x = 0
new_velocity_addition.z = 0
--smooths out mobs a bit
if vector_length(new_velocity_addition) >= 0.0001 then
self.object:add_velocity(new_velocity_addition)
end
end
--[[
_____ _
/ ___| (_)
\ `--.__ ___ _ __ ___
`--. \ \ /\ / / | '_ ` _ \
/\__/ /\ V V /| | | | | | |
\____/ \_/\_/ |_|_| |_| |_|
]]--
--make mobs flop
mobs.flop = function(self, velocity)
if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
return false
end
mobs.set_velocity(self, 0)
--fallback velocity to allow modularity
velocity = velocity or DEFAULT_JUMP_HEIGHT
--create a random direction (2d yaw)
local dir = DOUBLE_PI * math_random()
--create a random force value
local force = math_random(0,3) + math_random()
--convert the yaw to a direction vector then multiply it times the force
local final_additional_force = vector_multiply(minetest_yaw_to_dir(dir), force)
--place in the "flop" velocity to make the mob flop
final_additional_force.y = velocity
self.object:add_velocity(final_additional_force)
return true
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end
-- move mob in facing direction
--this has been modified to be internal
--internal = lua (self.yaw)
--engine = c++ (self.object:get_yaw())
mobs.set_swim_velocity = function(self, v)
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local yaw = (self.yaw or 0)
local pitch = (self.pitch or 0)
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if v == 0 then
pitch = 0
end
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local current_velocity = self.object:get_velocity()
local goal_velocity = {
x = (math_sin(yaw) * -v),
y = pitch,
z = (math_cos(yaw) * v),
}
local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
if vector_length(new_velocity_addition) > vector_length(goal_velocity) then
vector.multiply(new_velocity_addition, (vector_length(goal_velocity) / vector_length(new_velocity_addition)))
end
--smooths out mobs a bit
if vector_length(new_velocity_addition) >= 0.0001 then
self.object:add_velocity(new_velocity_addition)
end
end
--[[
______ _
| ___| |
| |_ | |_ _
| _| | | | | |
| | | | |_| |
\_| |_|\__, |
__/ |
|___/
]]--
-- move mob in facing direction
--this has been modified to be internal
--internal = lua (self.yaw)
--engine = c++ (self.object:get_yaw())
mobs.set_fly_velocity = function(self, v)
local yaw = (self.yaw or 0)
local pitch = (self.pitch or 0)
if v == 0 then
pitch = 0
end
local current_velocity = self.object:get_velocity()
local goal_velocity = {
x = (math_sin(yaw) * -v),
y = pitch,
z = (math_cos(yaw) * v),
}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
if vector_length(new_velocity_addition) > vector_length(goal_velocity) then
vector.multiply(new_velocity_addition, (vector_length(goal_velocity) / vector_length(new_velocity_addition)))
end
--smooths out mobs a bit
if vector_length(new_velocity_addition) >= 0.0001 then
self.object:add_velocity(new_velocity_addition)
end
end
--a quick and simple pitch calculation between two vector positions
mobs.calculate_pitch = function(pos1, pos2)
if pos1 == nil or pos2 == nil then
return false
end
return(minetest_dir_to_yaw(vector_new(vector_distance(vector_new(pos1.x,0,pos1.z),vector_new(pos2.x,0,pos2.z)),0,pos1.y - pos2.y)) + HALF_PI)
end
--make mobs fly up or down based on their y difference
mobs.set_pitch_while_attacking = function(self)
local pos1 = self.object:get_pos()
local pos2 = self.attacking:get_pos()
local pitch = mobs.calculate_pitch(pos2,pos1)
self.pitch = pitch
end
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--[[
___
|_ |
| |_ _ _ __ ___ _ __
| | | | | '_ ` _ \| '_ \
/\__/ / |_| | | | | | | |_) |
\____/ \__,_|_| |_| |_| .__/
| |
|_|
]]--
--special mob jump movement
mobs.jump_move = function(self, velocity)
if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
return
end
--make the mob stick for a split second
mobs.set_velocity(self,0)
--fallback velocity to allow modularity
jump_height = DEFAULT_JUMP_HEIGHT
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local yaw = (self.yaw or 0)
local current_velocity = self.object:get_velocity()
local goal_velocity = {
x = (math_sin(yaw) * -velocity),
y = jump_height,
z = (math_cos(yaw) * velocity),
}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
if vector_length(new_velocity_addition) > vector_length(goal_velocity) then
vector.multiply(new_velocity_addition, (vector_length(goal_velocity) / vector_length(new_velocity_addition)))
end
--smooths out mobs a bit
if vector_length(new_velocity_addition) >= 0.0001 then
self.object:add_velocity(new_velocity_addition)
end
end