faundation for json loading

assets/entities.json

@@ -0,0 +1,11 @@
+{
+    "ships": [
+        {
+            "destroyer": {
+                "texture": "assets/entities/ships/destroyer.svg",
+                "width": 58,
+                "height": 512
+            }
+        }
+    ]
+}

src/helper_funcs.cpp

@@ -0,0 +1,23 @@
+#include "types.hpp"
+#include <fstream>
+#include <nlohmann/json.hpp>
+#include <string>
+
+using json = nlohmann::json;
+
+void load_entity(Entity &entity, std::string type, std::string name) {
+  try {
+    std::ifstream entitiesF("assets/entities.json");
+    json entities = json::parse(entitiesF);
+
+  } catch (const json::parse_error &e) {
+    std::cerr << "Parse error: " << e.what() << "\n";
+    exit(1);
+  } catch (const std::exception &e) {
+    std::cerr << "Error: " << e.what() << "\n";
+    exit(2);
+  }
+
+  
+
+}

src/main.cpp

@@ -1,24 +1,29 @@
+#include "types.hpp"
 #include <SDL3/SDL.h>
 #include <SDL3_image/SDL_image.h>
 #include <cmath>
-#include "types.hpp"
-
 
+#define destroyer_width 58
+#define destroyer_height 512
 
 int main() {
   SDL_Init(SDL_INIT_VIDEO);
-    SDL_Window* window = SDL_CreateWindow("Naval Swarm", SCREEN_WIDTH, SCREEN_HEIGHT, 0);
+  SDL_Window *window =
-    SDL_Renderer* renderer = SDL_CreateRenderer(window, "gpu,vulcan");
+      SDL_CreateWindow("Naval Swarm", SCREEN_WIDTH, SCREEN_HEIGHT, 0);
+  SDL_Renderer *renderer = SDL_CreateRenderer(window, "gpu,vulcan");
 
   // Load textures
-    SDL_Texture* spriteSheet = IMG_LoadTexture(renderer, "assets/destroyer.svg");
+  SDL_Texture *spriteSheet = IMG_LoadTexture(renderer, "assets/destroyer.svg");
-    SDL_Texture* bgTexture = IMG_LoadTexture(renderer, "assets/background.png");
+  SDL_Texture *bgTexture = IMG_LoadTexture(renderer, "assets/background.png");
 
   // Initialize player
   Entity destroyer;
   destroyer.texture = spriteSheet;
-    destroyer.position = {WORLD_WIDTH/2.0f, WORLD_HEIGHT/2.0f, 58.0f, 512.0f};
+  destroyer.set_offset(destroyer_width / 2, destroyer_height / 2);
-    destroyer.srcRect = {0, 0, 58, 512};  // Static source rectangle
+  destroyer.position() = {WORLD_WIDTH / 2.0f, WORLD_HEIGHT / 2.0f, 58.0f,
+                          512.0f};
+  destroyer.srcRect = {0, 0, destroyer_width,
+                       destroyer_height}; // Static source rectangle
   destroyer.angle = 0;
 
   // Initialize camera
@@ -33,24 +38,25 @@ int main() {
     // Event handling
     SDL_Event event;
     while (SDL_PollEvent(&event)) {
-            if (event.type == SDL_EVENT_QUIT) running = false;
+      if (event.type == SDL_EVENT_QUIT)
+        running = false;
       if (event.type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
         // Check specific button (e.g., left mouse button)
         if (event.button.button == SDL_BUTTON_LEFT) {
-                    printf("Left mouse clicked at (%.1f, %.1f)\nCamera position: (%.1f, %.1f)\nTarget position: (%.1f, %.1f)\n", 
+          printf("Left mouse clicked at (%.1f, %.1f)\nCamera position: (%.1f, "
-                           event.button.x, event.button.y, camera.view.x, camera.view.y, camera.view.x+event.button.x, camera.view.y+event.button.y);
+                 "%.1f)\nTarget position: (%.1f, %.1f)\n",
-                    destroyer.Tposition.x = camera.view.x+event.button.x;
+                 event.button.x, event.button.y, camera.view.x, camera.view.y,
-                    destroyer.Tposition.y = camera.view.y+event.button.y;
+                 camera.view.x + event.button.x,
+                 camera.view.y + event.button.y);
+          destroyer.Tposition.x = camera.view.x + event.button.x;
+          destroyer.Tposition.y = camera.view.y + event.button.y;
           destroyer.gotoT = true;
         }
       }
     }
 
-        
-    
-
     // Input handling
-        const bool* keystate = SDL_GetKeyboardState(NULL);
+    const bool *keystate = SDL_GetKeyboardState(NULL);
 
     // Toggle camera mode with C key
     static Uint32 lastToggle = 0;
@@ -100,17 +106,40 @@ int main() {
       }
     }
 
-        destroyer.position.x += (float)moveX * destroyer.speed * deltaTime;
+    float step = destroyer.speed * deltaTime;
-        destroyer.position.y += (float)moveY * destroyer.speed * deltaTime;
+    destroyer.position().x += (float)moveX * step;
+    destroyer.position().y += (float)moveY * step;
 
-        if(destroyer.gotoT) {
+    if (destroyer.gotoT) {
-            destroyer.angle = std::atan2(destroyer.Tposition.y - destroyer.position.y, destroyer.Tposition.x - destroyer.position.x) * 180 / M_PI;
+      float dx = destroyer.Tposition.x - destroyer.position().x;
+      float dy = destroyer.Tposition.y - destroyer.position().y;
+
+      destroyer.angle = std::atan2(dy, dx) * 180 / M_PI;
+
+      float distance = std::sqrt(dx * dx + dy * dy);
+      if (distance > 0) {
+        dx /= distance;
+        dy /= distance;
+
+        if (distance <= step) {
+          destroyer.position().x = destroyer.Tposition.x;
+          destroyer.position().y = destroyer.Tposition.y;
+        } else {
+          destroyer.position().x += dx * step;
+          destroyer.position().y += dy * step;
+        }
+
+      } else {
+        destroyer.gotoT = false;
+      }
     }
 
     // Camera movement
     if (camera.followPlayer) {
-            float targetX = destroyer.position.x + destroyer.position.w/2 - camera.view.w/2;
+      float targetX = destroyer.position().x + destroyer.position().w / 2 -
-            float targetY = destroyer.position.y + destroyer.position.h/2 - camera.view.h/2;
+                      camera.view.w / 2;
+      float targetY = destroyer.position().y + destroyer.position().h / 2 -
+                      camera.view.h / 2;
       camera.view.x += (targetX - camera.view.x) * camera.smoothness;
       camera.view.y += (targetY - camera.view.y) * camera.smoothness;
     } else {
@@ -121,12 +150,15 @@ int main() {
     }
 
     // World bounds
-        destroyer.position.x = SDL_clamp(destroyer.position.x, 0.0f, WORLD_WIDTH - destroyer.position.w);
+    destroyer.position().x = SDL_clamp(destroyer.position().x, 0.0f,
-        destroyer.position.y = SDL_clamp(destroyer.position.y, 0.0f, WORLD_HEIGHT - destroyer.position.h);
+                                       WORLD_WIDTH - destroyer.position().w);
+    destroyer.position().y = SDL_clamp(destroyer.position().y, 0.0f,
+                                       WORLD_HEIGHT - destroyer.position().h);
     camera.view.x = SDL_clamp(camera.view.x, 0.0f, WORLD_WIDTH - camera.view.w);
-        camera.view.y = SDL_clamp(camera.view.y, 0.0f, WORLD_HEIGHT - camera.view.h);
+    camera.view.y =
+        SDL_clamp(camera.view.y, 0.0f, WORLD_HEIGHT - camera.view.h);
 
-        //ANIMATION HERE
+    // ANIMATION HERE
 
     // Rendering
     SDL_SetRenderDrawColor(renderer, 30, 30, 45, 255);
@@ -134,20 +166,19 @@ int main() {
 
     // Draw background
     if (bgTexture) {
-            SDL_FRect bgDest = { -camera.view.x, -camera.view.y, WORLD_WIDTH, WORLD_HEIGHT };
+      SDL_FRect bgDest = {-camera.view.x, -camera.view.y, WORLD_WIDTH,
+                          WORLD_HEIGHT};
       SDL_RenderTexture(renderer, bgTexture, NULL, &bgDest);
     }
 
     // Draw player (simplified without animation)
     SDL_FRect srcFRect;
     SDL_RectToFRect(&destroyer.srcRect, &srcFRect);
-        SDL_FRect destRect = {
+    SDL_FRect destRect = {destroyer.position().x - camera.view.x,
-            destroyer.position.x - camera.view.x,
+                          destroyer.position().y - camera.view.y,
-            destroyer.position.y - camera.view.y,
+                          destroyer.position().w, destroyer.position().h};
-            destroyer.position.w,
+    SDL_RenderTextureRotated(renderer, destroyer.texture, &srcFRect, &destRect,
-            destroyer.position.h
+                             destroyer.angle, nullptr, SDL_FLIP_NONE);
-        };
-        SDL_RenderTextureRotated(renderer, destroyer.texture, &srcFRect, &destRect, destroyer.angle, nullptr, SDL_FLIP_NONE);
 
     SDL_RenderPresent(renderer);
 
@@ -156,7 +187,8 @@ int main() {
     if (frameTime < TARGET_FRAME_TIME_NS) {
       const Uint64 sleepTime = TARGET_FRAME_TIME_NS - frameTime;
       SDL_DelayNS(sleepTime - 2'000'000);
-            while (SDL_GetTicksNS() - frameStart < TARGET_FRAME_TIME_NS) {}
+      while (SDL_GetTicksNS() - frameStart < TARGET_FRAME_TIME_NS) {
+      }
     }
 
     deltaTime = (SDL_GetTicksNS() - lastFrameTime) / 1e9f;

src/types.hpp

@@ -1,36 +1,37 @@
+#include "const.hpp"
 #include <SDL3/SDL.h>
 #include <SDL3_image/SDL_image.h>
-#include "const.hpp"
 #include <iostream>
 
 struct Angle360 {
-    private:
+private:
   int value{0};
 
   void normalize() {
     value %= 360;
-            if (value < 0) value += 360;  // Handle negative values
+    if (value < 0)
+      value += 360; // Handle negative values
   }
 
-    public:
+public:
   // Constructor
   Angle360(int val = 0) : value(val) { normalize(); }
 
   // Assignment operator
-        Angle360& operator=(int val) {
+  Angle360 &operator=(int val) {
     value = val;
     normalize();
     return *this;
   }
 
   // Compound assignment
-        Angle360& operator+=(int rhs) {
+  Angle360 &operator+=(int rhs) {
     value += rhs;
     normalize();
     return *this;
   }
 
-        Angle360& operator-=(int rhs) {
+  Angle360 &operator-=(int rhs) {
     value -= rhs;
     normalize();
     return *this;
@@ -40,16 +41,34 @@ struct Angle360 {
   operator int() const { return value; }
 
   // Stream output
-        friend std::ostream& operator<<(std::ostream& os, const Angle360& a) {
+  friend std::ostream &operator<<(std::ostream &os, const Angle360 &a) {
     return os << a.value;
   }
 };
 
 struct Entity {
-    SDL_FRect position;
+private:
+  SDL_FRect m_position;
+  SDL_FPoint m_offset{0, 0}; // Default offset
+
+public:
+  // Direct access reference with auto-sync
+  SDL_FRect &position() { return m_position; }
+  const SDL_FRect &position() const { return m_position; }
+
+  // Computed central position (always fresh)
+  SDL_FRect Central_position() const {
+    return {m_position.x + m_offset.x, m_position.y + m_offset.y, m_position.w,
+            m_position.h};
+  }
+
+  // Set offset values
+  void set_offset(float x, float y) { m_offset = {x, y}; }
+
+  // --- Existing members ---
   SDL_FRect Tposition;
   bool gotoT;
-    SDL_Texture* texture;
+  SDL_Texture *texture;
   SDL_Rect srcRect;
   float speed = 250.0f;
   Angle360 angle;