init.lua

   1 playerphysics = {}
   2
   3 local function calculate_attribute_product(player, attribute)
   4         local a = minetest.deserialize(player:get_attribute("playerphysics:physics"))
   5         local product = 1
   6         if a == nil or a[attribute] == nil then
   7                 return product
   8         end
   9         local factors = a[attribute]
  10         if type(factors) == "table" then
  11                 for _, factor in pairs(factors) do
  12                         product = product * factor
  13                 end
  14         end
  15         return product
  16 end
  17
  18 function playerphysics.add_physics_factor(player, attribute, id, value)
  19         local a = minetest.deserialize(player:get_attribute("playerphysics:physics"))
  20         if a == nil then
  21                 a = { [attribute] = { [id] = value } }
  22         elseif a[attribute] == nil then
  23                 a[attribute] = { [id] = value }
  24         else
  25                 a[attribute][id] = value
  26         end
  27         player:set_attribute("playerphysics:physics", minetest.serialize(a))
  28         local raw_value = calculate_attribute_product(player, attribute)
  29         player:set_physics_override({[attribute] = raw_value})
  30 end
  31
  32 function playerphysics.remove_physics_factor(player, attribute, id)
  33         local a = minetest.deserialize(player:get_attribute("playerphysics:physics"))
  34         if a == nil or a[attribute] == nil then
  35                 -- Nothing to remove
  36                 return
  37         else
  38                 a[attribute][id] = nil
  39         end
  40         player:set_attribute("playerphysics:physics", minetest.serialize(a))
  41         local raw_value = calculate_attribute_product(player, attribute)
  42         player:set_physics_override({[attribute] = raw_value})
  43 end