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feat: add UnitDistanceSquared for proximity and range check addons

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Returns squared distance between the player and a unit, plus a boolean
indicating whether the calculation was possible. Squared distance
avoids sqrt for efficient range comparisons.

Used by DBM, BigWigs, and proximity warning addons for raid encounter
range checks (e.g., "spread 10 yards" mechanics).
This commit is contained in:
Kelsi 2026-03-21 12:52:56 -07:00
parent c836b421fc
commit afc5266acf
1 changed files with 21 additions and 0 deletions
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21
src/addons/lua_engine.cpp
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@ -540,6 +540,26 @@ static int lua_UnitDetailedThreatSituation(lua_State* L) {
return 5;
}
// UnitDistanceSquared(unit) → distSq, canCalculate
static int lua_UnitDistanceSquared(lua_State* L) {
auto* gh = getGameHandler(L);
if (!gh) { lua_pushnumber(L, 0); lua_pushboolean(L, 0); return 2; }
const char* uid = luaL_checkstring(L, 1);
std::string uidStr(uid);
for (char& c : uidStr) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
uint64_t guid = resolveUnitGuid(gh, uidStr);
if (guid == 0 || guid == gh->getPlayerGuid()) { lua_pushnumber(L, 0); lua_pushboolean(L, 0); return 2; }
auto targetEnt = gh->getEntityManager().getEntity(guid);
auto playerEnt = gh->getEntityManager().getEntity(gh->getPlayerGuid());
if (!targetEnt || !playerEnt) { lua_pushnumber(L, 0); lua_pushboolean(L, 0); return 2; }
float dx = playerEnt->getX() - targetEnt->getX();
float dy = playerEnt->getY() - targetEnt->getY();
float dz = playerEnt->getZ() - targetEnt->getZ();
lua_pushnumber(L, dx*dx + dy*dy + dz*dz);
lua_pushboolean(L, 1);
return 2;
}
// CheckInteractDistance(unit, distIndex) → boolean
// distIndex: 1=inspect(28yd), 2=trade(11yd), 3=duel(10yd), 4=follow(28yd)
static int lua_CheckInteractDistance(lua_State* L) {
@ -3444,6 +3464,7 @@ void LuaEngine::registerCoreAPI() {
{"GetSpellCooldown", lua_GetSpellCooldown},
{"GetSpellPowerCost", lua_GetSpellPowerCost},
{"IsSpellInRange", lua_IsSpellInRange},
{"UnitDistanceSquared", lua_UnitDistanceSquared},
{"CheckInteractDistance", lua_CheckInteractDistance},
{"HasTarget", lua_HasTarget},
{"TargetUnit", lua_TargetUnit},