mods/mob/movement_code.lua

   1 --this is where all the movement code is stored for the pig mob
   2
   3 --This makes the mob walk at a certain speed and jump
   4 pig.move = function(self,dtime)
   5         self.manage_jump_timer(self,dtime)
   6         self.timer = self.timer - dtime
   7
   8         --jump
   9         self.jump(self)
  10
  11         --swim
  12         self.swim(self,dtime)
  13
  14         --print(self.timer)
  15         --direction state change
  16         if self.timer <= 0 and not self.following == true then
  17                 --print("changing direction")
  18                 self.timer = math.random(2,7)
  19                 self.direction = vector.new(math.random()*math.random(-1,1),0,math.random()*math.random(-1,1))
  20                 --local yaw = self.object:get_yaw() + dtime
  21                 self.speed = math.random(0,6)
  22                 --self.object:set_yaw(yaw)
  23         end
  24
  25         local currentvel = self.object:getvelocity()
  26         local goal = vector.multiply(self.direction,self.speed)
  27         local acceleration = vector.new(goal.x-currentvel.x,0,goal.z-currentvel.z)
  28         acceleration = vector.multiply(acceleration, 0.05)
  29         self.object:add_velocity(acceleration)
  30 end
  31
  32 --use raycasting to jump
  33 pig.jump = function(self)
  34         if self.jump_timer <= 0 then
  35                 local vel = self.object:get_velocity()
  36                 if (self.direction.x ~= 0 and vel.x == 0) or (self.direction.z ~= 0 and vel.z == 0) then
  37                         local pos = self.object:get_pos()
  38                         local ground_distance = self.object:get_properties().collisionbox[2]
  39                         local ray = minetest.raycast(pos, vector.add(pos, vector.new(0,ground_distance*1.1,0)), false, false)
  40                         if ray then
  41                                 for pointed_thing in ray do
  42                                         local collision_point = pointed_thing.under
  43                                         if collision_point then
  44                                                 local walkable = minetest.registered_nodes[minetest.get_node(collision_point).name].walkable
  45                                                 if walkable then
  46                                                         local distance = vector.subtract(collision_point,pos).y-self.object:get_properties().collisionbox[2]+0.4
  47                                                         if distance >= -0.11 then
  48                                                                 local vel = self.object:get_velocity()
  49                                                                 self.jump_timer = 0.5
  50                                                                 self.object:add_velocity(vector.new(vel.x,5,vel.z))
  51                                                         end
  52                                                 end
  53                                         end
  54                                 end
  55                         end
  56                 end
  57         end
  58 end
  59
  60 --makes the mob swim
  61 pig.swim = function(self,dtime)
  62         local pos = self.object:getpos()
  63         pos.y = pos.y + 0.3
  64         local node = minetest.get_node(pos).name
  65         self.swimming = false
  66         if node == "main:water" or node =="main:waterflow" then
  67                 local vel = self.object:getvelocity()
  68                 local goal = 3
  69                 local acceleration = vector.new(0,goal-vel.y,0)
  70                 --jump out of the water
  71                 if (vel.x == 0 and self.direction.x ~= 0) or (vel.z == 0 and self.direction.z ~= 0) then
  72                         self.object:set_velocity(vector.new(vel.x,5,vel.z))
  73                 --else swim
  74                 else
  75                         self.object:add_velocity(acceleration)
  76                 end
  77                 self.swimming = true
  78         end
  79 end