merge `master` into `loek/savemgr`

1 files changed, 55 insertions, 0 deletions

diff --git a/src/example/ecs.cpp b/src/example/ecs.cpp
new file mode 100644
index 0000000..e61c398
--- /dev/null
+++ b/src/example/ecs.cpp
@@ -0,0 +1,55 @@
+#include <iostream>
+
+#include <crepe/ComponentManager.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Metadata.h>
+#include <crepe/api/Transform.h>
+
+using namespace crepe;
+using namespace std;
+
+int main() {
+	// Create a few GameObjects
+	try {
+		GameObject body(0, "body", "person", Vector2{0, 0}, 0, 1);
+		GameObject right_leg(1, "rightLeg", "person", Vector2{1, 1}, 0, 1);
+		GameObject left_leg(2, "leftLeg", "person", Vector2{1, 1}, 0, 1);
+		GameObject right_foot(3, "rightFoot", "person", Vector2{2, 2}, 0, 1);
+		GameObject left_foot(4, "leftFoot", "person", Vector2{2, 2}, 0, 1);
+
+		// Set the parent of each GameObject
+		right_foot.set_parent(right_leg);
+		left_foot.set_parent(left_leg);
+		right_leg.set_parent(body);
+		left_leg.set_parent(body);
+
+		// Adding a second Transform component is not allowed and will invoke an exception
+		body.add_component<Transform>(Vector2{10, 10}, 0, 1);
+	} catch (const exception & e) {
+		cerr << e.what() << endl;
+	}
+
+	// Get the Metadata and Transform components of each GameObject
+	ComponentManager & mgr = ComponentManager::get_instance();
+	vector<reference_wrapper<Metadata>> metadata
+		= mgr.get_components_by_type<Metadata>();
+	vector<reference_wrapper<Transform>> transform
+		= mgr.get_components_by_type<Transform>();
+
+	// Print the Metadata and Transform components
+	for (auto & m : metadata) {
+		cout << "Id: " << m.get().game_object_id << " Name: " << m.get().name
+			 << " Tag: " << m.get().tag << " Parent: " << m.get().parent
+			 << " Children: ";
+		for (auto & c : m.get().children) {
+			cout << c << " ";
+		}
+		cout << endl;
+	}
+	for (auto & t : transform) {
+		cout << "Id: " << t.get().game_object_id << " Position: ["
+			 << t.get().position.x << ", " << t.get().position.y << "]" << endl;
+	}
+
+	return 0;
+}