1 files changed, 49 insertions, 0 deletions
diff --git a/sim/src/systems.cpp b/sim/src/systems.cpp
new file mode 100644
index 0000000..114ed2f
--- /dev/null
+++ b/sim/src/systems.cpp
@@ -0,0 +1,49 @@
+#include <kurator/sim/systems.h>
+
+#include <kurator/engine/Context.h>
+#include <kurator/sim/components.h>
+#include <kurator/sim/events.h>
+#include <kurator/sim/HitPoints.h>
+#include <kurator/stats/events.h>
+#include <kurator/universe/UniqueIdentifier.h>
+
+
+namespace kurator
+{
+namespace sim
+{
+
+
+void
+keep_at_range(engine::Context& ctx)
+{
+	auto view = ctx.registry.view<Transform, AIState>();
+	for (auto&& [entity, self, ai] : view.each()) {
+		if (!ctx.registry.valid(ai.target))
+			continue;
+		const auto target = ctx.registry.get<Transform>(ai.target);
+		const auto offset = target.position - self.position;
+		ai.destination = target.position - offset.normalized().scale(ai.keep_at_range);
+	}
+}
+
+
+void
+kill_off_dead(engine::Context& ctx)
+{
+	auto view = ctx.registry.view<HitPoints>();
+	for (auto&& [entity, points] : view.each()) {
+		if (points.is_alive())
+			continue;
+		if (ctx.registry.all_of<universe::UniqueIdentifier, Team>(entity)) {
+			const auto& [identifier, team] = ctx.registry.get<universe::UniqueIdentifier, Team>(entity);
+			ctx.dispatcher.trigger(stats::ShipLeft{ctx.clock.game, identifier, team.id, true});
+			ctx.dispatcher.trigger(Destroyed{entity});
+		}
+		ctx.registry.destroy(entity);
+	}
+}
+
+
+}  // namespace sim
+}  // namespace kurator