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feat: add IsSpellInRange for healing and range-check addons

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Returns 1 if the spell can reach the target, 0 if out of range, nil
if range can't be determined. Compares player-to-target distance against
the spell's maxRange from Spell.dbc via SpellDataResolver.

Used by healing addons (Healbot, VuhDo, Clique) to check if heals can
reach party members, and by action bar addons for range coloring.
This commit is contained in:
Kelsi 2026-03-21 12:23:08 -07:00
parent d575c06bc1
commit 42b776dbf8
1 changed files with 44 additions and 0 deletions
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44
src/addons/lua_engine.cpp
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@ -540,6 +540,49 @@ static int lua_UnitDetailedThreatSituation(lua_State* L) {
return 5;
}
// IsSpellInRange(spellName, unit) → 0 or 1 (nil if can't determine)
static int lua_IsSpellInRange(lua_State* L) {
auto* gh = getGameHandler(L);
if (!gh) { lua_pushnil(L); return 1; }
const char* spellNameOrId = luaL_checkstring(L, 1);
const char* uid = luaL_optstring(L, 2, "target");
// Resolve spell ID
uint32_t spellId = 0;
if (spellNameOrId[0] >= '0' && spellNameOrId[0] <= '9') {
spellId = static_cast<uint32_t>(strtoul(spellNameOrId, nullptr, 10));
} else {
std::string nameLow(spellNameOrId);
for (char& c : nameLow) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
for (uint32_t sid : gh->getKnownSpells()) {
std::string sn = gh->getSpellName(sid);
for (char& c : sn) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
if (sn == nameLow) { spellId = sid; break; }
}
}
if (spellId == 0) { lua_pushnil(L); return 1; }
// Get spell max range from DBC
auto data = gh->getSpellData(spellId);
if (data.maxRange <= 0.0f) { lua_pushnil(L); return 1; }
// Resolve target position
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) { lua_pushnil(L); return 1; }
auto targetEnt = gh->getEntityManager().getEntity(guid);
auto playerEnt = gh->getEntityManager().getEntity(gh->getPlayerGuid());
if (!targetEnt || !playerEnt) { lua_pushnil(L); return 1; }
float dx = playerEnt->getX() - targetEnt->getX();
float dy = playerEnt->getY() - targetEnt->getY();
float dz = playerEnt->getZ() - targetEnt->getZ();
float dist = std::sqrt(dx*dx + dy*dy + dz*dz);
lua_pushnumber(L, dist <= data.maxRange ? 1 : 0);
return 1;
}
// UnitIsVisible(unit) → boolean (entity exists in the client's entity manager)
static int lua_UnitIsVisible(lua_State* L) {
const char* uid = luaL_optstring(L, 1, "target");
@ -3371,6 +3414,7 @@ void LuaEngine::registerCoreAPI() {
{"IsSpellKnown", lua_IsSpellKnown},
{"GetSpellCooldown", lua_GetSpellCooldown},
{"GetSpellPowerCost", lua_GetSpellPowerCost},
{"IsSpellInRange", lua_IsSpellInRange},
{"HasTarget", lua_HasTarget},
{"TargetUnit", lua_TargetUnit},
{"ClearTarget", lua_ClearTarget},