63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
#include "Systems/SpawnerSystem.h"
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SpawnerSystem::SpawnerSystem(World* world, EventBroker* eventBroker)
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: System(world, eventBroker)
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{
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EVENT_SUBSCRIBE_MEMBER(m_OnSpawnerSpawn, &SpawnerSystem::OnSpawnerSpawn);
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}
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EntityWrapper SpawnerSystem::Spawn(EntityWrapper spawner, EntityWrapper parent /*= EntityWrapper::Invalid*/)
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{
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// Spawn the entity in the parent's world if it exists, otherwise in the spawner's world
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World* world = parent.World;
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if (world == nullptr) {
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world = spawner.World;
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}
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// Find any SpawnPoints existing as children of spawner
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auto children = spawner.World->GetChildren(spawner.ID);
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std::vector<EntityWrapper> spawnPoints;
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for (auto kv = children.first; kv != children.second; ++kv) {
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const EntityID& child = kv->second;
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if (spawner.World->HasComponent(child, "SpawnPoint")) {
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spawnPoints.push_back(EntityWrapper(spawner.World, child));
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}
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}
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// Choose a random SpawnPoint
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EntityWrapper spawnPoint = spawner;
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if (!spawnPoints.empty()) {
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if (spawnPoints.size() > 1) {
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static std::random_device randomDevice;
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static std::mt19937 randomGenerator(randomDevice());
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std::uniform_int_distribution<> distribution(0, static_cast<int>(std::distance(spawnPoints.begin(), spawnPoints.end())) - 1);
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auto randomSpawnPointIt = spawnPoints.begin();
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std::advance(randomSpawnPointIt, distribution(randomGenerator));
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spawnPoint = *randomSpawnPointIt;
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} else {
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spawnPoint = spawnPoints.front();
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}
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}
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// Load the entity file and parse it
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const std::string& entityFilePath = spawner["Spawner"]["EntityFile"];
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auto entityFile = ResourceManager::Load<EntityFile>(entityFilePath);
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if (entityFile == nullptr) {
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return EntityWrapper::Invalid;
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}
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EntityFileParser parser(entityFile);
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EntityWrapper spawnedEntity(world, parser.MergeEntities(world, parent.ID));
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// Set its position and orientation to that of the SpawnPoint
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spawnedEntity["Transform"]["Position"] = Transform::AbsolutePosition(spawnPoint.World, spawnPoint.ID);
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// TODO: Quaternions, bitch
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//spawnedEntity["Transform"]["Orientation"] = glm::eulerAngles(Transform::AbsoluteOrientation(spawnPoint.World, spawnPoint.ID));
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return spawnedEntity;
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}
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bool SpawnerSystem::OnSpawnerSpawn(Events::SpawnerSpawn& e)
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{
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EntityWrapper spawnedEntity = Spawn(e.Spawner, e.Parent);
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return true;
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} |