capturetheflag/mods/pvp/medkits/init.lua

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-- Table of tables indexed by player names, each having three fields:
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-- {
-- hp: HP at time of left-click + regen_max,
-- pos: Position of player while initiating the healing process
-- hud: ID of "healing effect" HUD element
-- }
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local players = {}
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local regen_max = 20 -- Max HP provided by one medkit
local regen_interval = 0.5 -- Time in seconds between each iteration
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local regen_timer = 0 -- Timer to keep track of regen_interval
local regen_step = 1 -- Number of HP added every iteration
-- Boolean function for use by other mods to check if a player is healing
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medkits = {}
function medkits.is_healing(name)
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return players[name] and true or false
end
-- Called when player uses a medkit
-- Aborts if player is already healing
local function start_healing(stack, player)
if not player then
return
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end
local name = player:get_player_name()
local hp = player:get_hp()
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if players[name] or hp >= regen_max then
return
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end
players[name] = {
hp = hp,
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pos = player:get_pos(),
hud = player:hud_add({
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hud_elem_type = "image",
position = {x = 0.5, y = 0.5},
scale = {x = -100, y = -100},
text = "medkit_hud.png"
})
}
stack:take_item()
return stack
end
-- Called after regen is complete. Remove additional effects
-- If interrupted == true, revert to original HP and give back one medkit.
local function stop_healing(player, interrupted)
local name = player:get_player_name()
local info = players[name]
players[name] = nil
if interrupted then
minetest.chat_send_player(name, minetest.colorize("#FF4444",
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"Your healing was interrupted!"))
player:set_hp(info.hp)
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player:get_inventory():add_item("main", ItemStack("medkits:medkit 1"))
end
player:hud_remove(info.hud)
end
-- Called after left-click every n seconds (determined by regen_interval)
-- heals player for a total of regen_max, limited by player's max hp
minetest.register_globalstep(function(dtime)
regen_timer = regen_timer + dtime
if regen_timer < regen_interval then
return
end
for name, info in pairs(players) do
local player = minetest.get_player_by_name(name)
if not player then
players[name] = nil
else
-- Abort if player moves more than 1m in any direction to
-- allow players to manually interrupt healing if necessary
local pos = player:get_pos()
if vector.distance(pos, info.pos) >= 1 then
stop_healing(player, true)
end
-- Stop healing if target reached
if players[name] then
local hp = player:get_hp()
if hp < regen_max then
player:set_hp(math.min(hp + regen_step, regen_max))
else
player:set_hp(regen_max)
stop_healing(player)
end
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end
end
end
regen_timer = 0
end)
-- If player takes damage while healing,
-- stop regen and revert back to original state
minetest.register_on_player_hpchange(function(player, hp, reason)
if hp < 0 then
if players[player:get_player_name()] then
stop_healing(player, true)
end
if reason and reason.type == "punch" then
local hitter = reason.object
if hitter and players[hitter:get_player_name()] then
stop_healing(hitter, true)
end
end
end
return hp
end, true)
minetest.register_on_leaveplayer(function(player)
players[player:get_player_name()] = nil
end)
minetest.register_craftitem("medkits:medkit", {
description = "Medkit",
inventory_image = "medkit_medkit.png",
wield_image = "medkit_medkit.png",
stack_max = 10,
on_use = start_healing
})