Merge pull request 'grid: add a guide grid' (#5) from lju/adding-grid into main

Reviewed-on: #5

CMakeLists.txt

@@ -69,6 +69,7 @@ include_directories(${imgui_SOURCE_DIR} ${rlImGui_SOURCE_DIR})
 set(SRC_CXX_FILES "./src/main.cpp"
                   "./src/rules.cpp"
                   "./src/world.cpp"
+                  "./src/grid.cpp"
                   "./src/render.cpp"
                   "./src/control_menu.cpp"
                   "./src/settings_menu.cpp"

includes/grid.hpp

@@ -0,0 +1,28 @@
+/*
+* File name: grid.hpp
+* Author: lejulien
+* Date created: 01-01-1970 00:59:59
+// Date modified: 12-01-2026 21:30:10
+* ------
+*/
+
+#pragma once
+
+#include <context.hpp>
+#include <memory>
+#include <settings_menu.hpp>
+#include <world.hpp>
+
+namespace gol {
+
+class Grid {
+ public:
+  Grid(std::shared_ptr<ctx>);
+  ~Grid() = default;
+  void display();
+
+ private:
+  std::shared_ptr<ctx> context_;
+};
+
+};  // namespace gol

src/grid.cpp

@@ -0,0 +1,27 @@
+/*
+* File name: grid.cpp
+* Author: lejulien
+* Date created: 01-01-1970 00:59:59
+// Date modified: 12-01-2026 21:30:10
+* ------
+*/
+
+#include <raylib.h>
+
+#include <grid.hpp>
+
+namespace gol {
+
+Grid::Grid(std::shared_ptr<ctx> context) : context_(context) {}
+
+void Grid::display() {
+  auto cell_size = context_->settings_menu->getCellSize();
+  for (int j = 0; j < context_->world->getHeight(); j++) {
+    for (int i = 0; i < context_->world->getWidth(); i++) {
+      DrawRectangleLines(i * cell_size, j * cell_size, cell_size, cell_size,
+                         GRAY);
+    }
+  }
+}
+
+}  // namespace gol

src/main.cpp

@@ -26,6 +26,7 @@
 #include <selection.hpp>
 #include <paterns_menu.hpp>
 #include <patern_preview.hpp>
+#include <grid.hpp>
 
 int main(int ac, char **av) {
   std::shared_ptr<gol::ctx> context = std::make_shared<gol::ctx>();
@@ -109,6 +110,7 @@ int main(int ac, char **av) {
   context->selection = std::make_shared<gol::Selection>(context);
   context->paterns_menu = std::make_shared<gol::PaternsMenu>(context);
   context->patern_preview = std::make_shared<gol::PaternPreview>(context);
+  gol::Grid grid(context);
 
   // Speed handling values
   float sim_speed = 1.0f;
@@ -155,6 +157,7 @@ int main(int ac, char **av) {
     }
     BeginDrawing();
     ClearBackground(BLACK);
+    grid.display();
     context->render->display(context->world);
     context->selection->display();
     context->patern_preview->display();