wippatern_preview: Adding patern preview

This adds a preview of the patern placement, checking out of bound

includes/context.hpp

@@ -22,6 +22,7 @@ class SelectionMenu;
 class ControlMenu;
 class Selection;
 class PaternsMenu;
+class PaternPreview;
 
 typedef struct ctx {
   std::shared_ptr<World> world = nullptr;
@@ -32,6 +33,7 @@ typedef struct ctx {
   std::shared_ptr<ControlMenu> control_menu = nullptr;
   std::shared_ptr<Selection> selection = nullptr;
   std::shared_ptr<PaternsMenu> paterns_menu = nullptr;
+  std::shared_ptr<PaternPreview> patern_preview = nullptr;
   nlohmann::json config_json;
   std::filesystem::path program_dir;
 } ctx;

includes/patern_preview.hpp

@@ -0,0 +1,32 @@
+/*
+* File name: patern_preview.hpp
+* Author: lejulien
+* Date created: 01-01-1970 00:59:59
+// Date modified: 12-01-2026 21:30:10
+* ------
+*/
+
+#pragma once
+
+#include <memory>
+
+#include <raylib.h>
+
+#include <context.hpp>
+
+namespace gol {
+
+class PaternPreview {
+public:
+  PaternPreview(std::shared_ptr<ctx>);
+  ~PaternPreview() = default;
+  void update();
+  void display();
+  void start();
+private:
+  bool is_started = false;
+  std::shared_ptr<ctx> context_;
+  Vector2 mouse_pos_ = {0, 0};
+};
+
+} // namespace gol

includes/paterns_menu.hpp

@@ -30,6 +30,7 @@ private:
   std::shared_ptr<ctx> context_ = nullptr;
   std::map<std::string,std::string> paterns_paths_list_;
   std::vector<std::string> paterns_name_list_;
+public:
   int patern_width_ = 0;
   int patern_height_ = 0;
   std::vector<uint32_t> loaded_patern_;

includes/snapping.hpp

@@ -1,5 +1,5 @@
 /*
-* File name: selection.cpp
+* File name: snapping.hpp
 * Author: lejulien
 * Date created: 01-01-1970 00:59:59
 // Date modified: 12-01-2026 21:30:10
@@ -13,12 +13,6 @@
 #include <raylib.h>
 #include <cmath>
 
-Vector2 snapToGrid(Vector2 screen, int cell_size) {
-  return {static_cast<float>(round(screen.x / cell_size) * cell_size),
-          static_cast<float>(round(screen.y / cell_size) * cell_size)};
-}
+Vector2 snapToGrid(Vector2 screen, int cell_size);
 
-Vector2i screenToGrid(Vector2 screen, int cell_size) {
-  return {static_cast<int>(round(screen.x / cell_size)),
-          static_cast<int>(round(screen.y / cell_size))};
-}
+Vector2i screenToGrid(Vector2 screen, int cell_size);