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

includes/patern_preview.hpp

@@ -27,6 +27,7 @@ private:
   bool is_started = false;
   std::shared_ptr<ctx> context_;
   Vector2 mouse_pos_ = {0, 0};
+  bool is_unplacable_ = false;
 };
 
 } // namespace gol

includes/world.hpp

@@ -37,6 +37,7 @@ public:
   void setCell(int x, int y);
   void resize(int width, int height); // destructive
   std::vector<uint32_t> getSelection(Vector2i &origin, Vector2i &size);
+  void setSelection(Vector2i &origin, Vector2i &size, std::vector<uint32_t> &data);
 
   // Private members
 private:

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();

src/patern_preview.cpp

@@ -30,24 +30,28 @@ void PaternPreview::update() {
     is_started = false;
     return;
   }
-  // if right click stop the preview
+  if (ImGui::IsMouseClicked(0) && !is_unplacable_) {
-  // if left click, apply patern to current world
+    auto selection_pos =
+        screenToGrid(mouse_pos_, context_->settings_menu->getCellSize());
+    Vector2i size = {context_->paterns_menu->patern_width_,
+                     context_->paterns_menu->patern_height_};
+    context_->world->setSelection(selection_pos, size,
+                                  context_->paterns_menu->loaded_patern_);
+    is_started = false;
+  }
   // mouse should pass through any present windows
 }
 
 void PaternPreview::display() {
   if (!is_started) return;
-  std::cout << "preview display started " << std::endl;
   auto cell_size = context_->settings_menu->getCellSize();
   auto mouse_in_grid =
       screenToGrid(mouse_pos_, context_->settings_menu->getCellSize());
-  bool is_unplacable =
+  is_unplacable_ =
       ((mouse_in_grid.x + context_->paterns_menu->patern_width_ >
         context_->world->getWidth()) ||
        (mouse_in_grid.y + context_->paterns_menu->patern_height_ >
         context_->world->getHeight()));
-  std::cout << "mx:" << mouse_in_grid.x << ", my:" << mouse_in_grid.y
-            << ", cs:" << context_->settings_menu->getCellSize() << std::endl;
   for (int j = 0; j < context_->paterns_menu->patern_height_; j++) {
     for (int i = 0; i < context_->paterns_menu->patern_width_; i++) {
       auto cell =
@@ -56,7 +60,7 @@ void PaternPreview::display() {
       if (cell) {
         DrawRectangle((i + mouse_in_grid.x) * cell_size,
                       (j + mouse_in_grid.y) * cell_size, cell_size, cell_size,
-                      (is_unplacable) ? RED : BLUE);
+                      (is_unplacable_) ? RED : BLUE);
       }
     }
   }

src/world.cpp

@@ -143,7 +143,6 @@ void World::resize(int width, int height) {
 }
 
 std::vector<uint32_t> World::getSelection(Vector2i &origin, Vector2i &size) {
-  // We assume the selection is in the grid for now
   std::vector<uint32_t> data = {static_cast<uint32_t>(size.x),
                                 static_cast<uint32_t>(size.y)};
   for (int y = origin.y; y < origin.y + size.y; y++) {
@@ -153,3 +152,12 @@ std::vector<uint32_t> World::getSelection(Vector2i &origin, Vector2i &size) {
   }
   return data;
 }
+
+void World::setSelection(Vector2i &origin, Vector2i &size, std::vector<uint32_t> &data) {
+  
+  for (int y = 0; y < size.y; y++) {
+    for (int x = 0; x < size.x; x++) {
+      (*_data)[(x + origin.x) + (y + origin.y) * _width] = data[x + y * size.x];
+    }
+  }
+}