6 files changed, 73 insertions, 0 deletions
diff --git a/kurator/CMakeLists.txt b/kurator/CMakeLists.txt
index c547acd..283d84e 100644
--- a/kurator/CMakeLists.txt
+++ b/kurator/CMakeLists.txt
@@ -6,6 +6,7 @@ add_executable(
 	src/Campaign.cpp
 	src/colors.cpp
 	src/ForceBalance.cpp
+	src/Grid.cpp
 	src/main.cpp
 	src/Pause.cpp
 	src/PopupEmitter.cpp
diff --git a/kurator/src/Battle.cpp b/kurator/src/Battle.cpp
index 8073585..74f40f8 100644
--- a/kurator/src/Battle.cpp
+++ b/kurator/src/Battle.cpp
@@ -19,8 +19,10 @@
 #include <kurator/universe/ShipType.h>
 #include <kurator/universe/UniqueIdentifier.h>
 
+#include "Camera.h"
 #include "colors.h"
 #include "components.h"
+#include "Grid.h"
 #include "Pause.h"
 #include "PopupEmitter.h"
 #include "Session.h"
@@ -71,6 +73,7 @@ Battle::update(const float dt)
 {
 	if (IsKeyPressed(KEY_ESCAPE))
 		return session->set(std::make_shared<Pause>(session, session->current()));
+	camera.scale = std::min(GetScreenWidth()/30000.0, GetScreenHeight()/30000.0);
 	battle->update(dt * time_factor);
 	auto& registry = battle->registry();
 	auto timers = registry.view<Timed>();
@@ -125,6 +128,7 @@ Battle::draw() const
 	const int hwidth = GetScreenWidth() / 2;
 	const int hheight = GetScreenHeight() / 2;
 	const double scale = std::min(hwidth/15000.0, hheight/15000.0);
+	Grid().draw(camera);
 	auto& registry = battle->registry();
 	auto crosses = registry.view<sim::Transform, Cross>();
 	for (const auto& [entity, transform, cross] : crosses.each()) {
diff --git a/kurator/src/Battle.h b/kurator/src/Battle.h
index 7a48e21..e7813d7 100644
--- a/kurator/src/Battle.h
+++ b/kurator/src/Battle.h
@@ -9,6 +9,7 @@
 #include <kurator/stats/EventLog.h>
 #include <kurator/stats/events.h>
 
+#include "Camera.h"
 #include "ForceBalance.h"
 #include "Scene.h"
 #include "Session.h"
@@ -34,6 +35,7 @@ public:
 private:
 	std::shared_ptr<Session> session;
 	std::unique_ptr<sim::Battle> battle;
+	Camera camera;
 	ForceBalance balance;
 	stats::EventLog log;
 	float time_factor;
diff --git a/kurator/src/Camera.h b/kurator/src/Camera.h
new file mode 100644
index 0000000..b6ca7d1
--- /dev/null
+++ b/kurator/src/Camera.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <kurator/sim/Point.h>
+
+
+namespace kurator
+{
+
+
+struct Camera
+{
+	sim::Point offset = {};
+	double scale = 1.0;
+};
+
+
+}  // namespace kurator
diff --git a/kurator/src/Grid.cpp b/kurator/src/Grid.cpp
new file mode 100644
index 0000000..53f7b47
--- /dev/null
+++ b/kurator/src/Grid.cpp
@@ -0,0 +1,32 @@
+#include "Grid.h"
+
+#include <raylib.h>
+
+#include "Camera.h"
+
+
+namespace kurator
+{
+
+
+void
+Grid::draw(const Camera& camera) const
+{
+	const int width = GetScreenWidth();
+	const int height = GetScreenHeight();
+	DrawLine(
+		width/2 - camera.offset.x*camera.scale,
+		0,
+		width/2 - camera.offset.x*camera.scale,
+		height,
+		DARKGRAY);
+	DrawLine(
+		0,
+		height/2 - camera.offset.y*camera.scale,
+		width,
+		height/2 - camera.offset.y*camera.scale,
+		DARKGRAY);
+}
+
+
+}  // namespace kurator
diff --git a/kurator/src/Grid.h b/kurator/src/Grid.h
new file mode 100644
index 0000000..cf9a00d
--- /dev/null
+++ b/kurator/src/Grid.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "Camera.h"
+
+
+namespace kurator
+{
+
+
+class Grid
+{
+public:
+	void draw(const Camera& camera) const;
+};
+
+
+}  // namespace kurator