basic ECS spawner

GECS/systems/default_systems.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://b2v1bngfh5te"]
+
+[ext_resource type="Script" uid="uid://b3vi2ingux88g" path="res://addons/gecs/lib/system_group.gd" id="1_sk1vy"]
+[ext_resource type="Script" uid="uid://dpglt5gt5ijrn" path="res://GECS/systems/s_movement.gd" id="2_aqda8"]
+[ext_resource type="Script" uid="uid://cb2kev6dsctfu" path="res://GECS/systems/s_spawner.gd" id="2_hdbau"]
+
+[node name="Systems" type="Node"]
+
+[node name="gameplay" type="Node" parent="."]
+script = ExtResource("1_sk1vy")
+metadata/_custom_type_script = "uid://b3vi2ingux88g"
+
+[node name="SpawnSystem" type="Node" parent="gameplay"]
+script = ExtResource("2_hdbau")
+group = &"gameplay"
+metadata/_custom_type_script = "uid://cb2kev6dsctfu"
+
+[node name="physics" type="Node" parent="."]
+script = ExtResource("1_sk1vy")
+metadata/_custom_type_script = "uid://b3vi2ingux88g"
+
+[node name="MovementSystem" type="Node" parent="physics"]
+script = ExtResource("2_aqda8")
+group = &"physics"
+metadata/_custom_type_script = "uid://dpglt5gt5ijrn"

GECS/systems/s_movement.gd

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+class_name MovementSystem
+extends System
+
+func query():
+	# Find all entities that have both transform and velocity
+	return q.with_all([C_Velocity])
+
+func process(entities: Array[Entity], _components: Array, delta: float):
+	for entity in entities:
+		var c_velocity = entity.get_component(C_Velocity) as C_Velocity
+		
+		if entity.velocity.length() == 0:
+			entity.velocity = c_velocity.velocity
+			
+		# Add the gravity.
+		if not entity.is_on_floor():
+			entity.velocity += entity.get_gravity() * delta
+			
+		# Bounce off screen edges (simple example)
+		if entity.global_position.x > 10 && entity.velocity.x > 0:
+			entity.velocity = -c_velocity.velocity
+		if  entity.global_position.x < -10 && entity.velocity.x < 0:
+			entity.velocity = c_velocity.velocity
+			
+		entity.move_and_slide()

GECS/systems/s_movement.gd.uid

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+uid://dpglt5gt5ijrn

GECS/systems/s_spawner.gd

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+class_name SpawnSystem
+extends System
+
+func query():
+	# Find all entities that have both transform and velocity
+	return q.with_all([C_SpawnPoint]).enabled()
+
+func process(entities: Array[Entity], _components: Array, delta: float):
+	for entity in entities:
+		var spawn_point = entity.get_component(C_SpawnPoint) as C_SpawnPoint
+		
+		if not spawn_point.should_spawn():
+			spawn_point.spawn_cooldown -= delta
+			continue
+			
+		var spawned = spawn_point.spawn_prefab.instantiate() as Entity
+		get_tree().current_scene.add_child(spawned)
+		ECS.world.add_entity(spawned)
+		
+		spawned.global_position = entity.global_position
+		spawn_point.start_spawn_cooldown()

GECS/systems/s_spawner.gd.uid

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+uid://cb2kev6dsctfu