Better code structure: snake game object, player game object, bot game object

include/Bot.hpp

@@ -5,29 +5,27 @@
 #include "Map.hpp"
 #include "Snake.hpp"
 
-class Bot : public Snake, public GameObject {
+class Bot : public Snake {
 public:
   struct Config {
     float time_between_targets;
-    double speed;
-    float move_interval;
   };
 
-  Bot(canvas::SnakeObject obj, Config config, Map &map)
-      : Snake(obj), config_(config), map_(map), real_pos_(obj.pos) {}
+  Bot(canvas::SnakeObject::Config canvas_config, Snake::Config snake_config,
+      Config bot_config, Map &map)
+      : Snake(canvas_config, snake_config, map), bot_config_(bot_config) {}
 
-  void act(float dt) override {
+protected:
+  void change_direction(float dt) override {
     time_from_target_set_ += dt;
 
-    int eaten = map_.eat(utils::to_world_coord(pos), 20);
-    inc_length(eaten);
-
     if (not target_.has_value() or
-        time_from_target_set_ >= config_.time_between_targets or
-        (target_.value() - pos).len_sq() < radius * radius) {
+        time_from_target_set_ >= bot_config_.time_between_targets or
+        (target_.value() - get_pos()).len_sq() <
+            canvas_config_.radius * canvas_config_.radius) {
       time_from_target_set_ = 0;
 
-      target_ = map_.find_nearest_food(pos);
+      target_ = map_.find_nearest_food(get_pos());
     }
 
     // check for case when no food found
@@ -35,29 +33,11 @@ public:
       direction_ = (Vecf(target_.value()) - real_pos_).norm();
       // TODO: manually change direction
     }
-
-    move(dt);
   }
 
-  void draw(Veci offset) override { Snake::draw(offset); }
-
 protected:
-  void move(float dt) {
-    real_pos_ += direction_ * dt * config_.speed;
-    move_time_delta_ += dt;
-    if (move_time_delta_ > config_.move_interval) {
-      move_time_delta_ -= config_.move_interval;
-      add(Veci(real_pos_));
-    }
-  }
+  const Config bot_config_;
 
-private:
-  const Config config_;
-  Map &map_;
-
-  Vecf real_pos_;
-  Vecf direction_ = {};
   std::optional<Veci> target_ = {};
   float time_from_target_set_ = 0;
-  float move_time_delta_ = 0;
 };

include/Params.hpp

@@ -3,3 +3,5 @@
 #include "Vec.hpp"
 
 constexpr Veci WORLD_SIZE = {.x = 10000, .y = 10000};
+
+constexpr double MIN_CONTROL_DISTANCE = 10;

include/Player.hpp

@@ -1,11 +1,48 @@
 #pragma once
 
-#include "Vec.hpp"
+#include "Snake.hpp"
 
-struct Player {
-  Vecf pos;
-  Vecf direction;
-  double speed;
-  double move_interval;
-  double move_time_delta;
+// struct Player {
+//   Vecf pos;
+//   Vecf direction;
+//   double speed;
+//   double move_interval;
+//   double move_time_delta;
+// };
+
+class Player : public Snake {
+public:
+  using Snake::Snake;
+
+  void act(float dt) override {
+    int eaten = map_.eat(
+        utils::to_world_coord(get_pos() + utils::get_screen_center()), 20);
+    inc_length(eaten);
+
+    change_direction(dt);
+
+    move(dt);
+  }
+
+  void draw(Veci offset) override {
+    Snake::draw(offset - utils::get_screen_center());
+  }
+
+protected:
+  void change_direction(float) override {
+    Veci cursor = utils::get_cursor();
+
+    if (cursor != prev_cursor_ and utils::is_on_screen(cursor)) {
+      Vecf diff(cursor - utils::get_screen_center()); // - pos;
+
+      if (diff.len() > MIN_CONTROL_DISTANCE) {
+        direction_ = diff.norm();
+      }
+    }
+
+    prev_cursor_ = cursor;
+  }
+
+protected:
+  Veci prev_cursor_ = {};
 };

include/Snake.hpp

@@ -3,19 +3,21 @@
 #include <deque>
 
 #include "Canvas.hpp"
+#include "Map.hpp"
 
 namespace canvas {
 
-struct SnakeObject : public Object {
-  size_t length;
+class SnakeObject {
+public:
+  struct Config {
+    Object obj;
+    size_t initial_length;
     int radius;
   };
 
-} // namespace canvas
-
-class Snake : protected canvas::SnakeObject {
-public:
-  Snake(canvas::SnakeObject obj) : SnakeObject(obj), track_{pos} {}
+  SnakeObject(Config config)
+      : canvas_config_(config), length_{config.initial_length},
+        track_{config.obj.pos} {}
 
   void add(Veci pos);
 
@@ -23,26 +25,80 @@ public:
 
   //
 
-  Veci get_pos() { return pos; }
+  Veci get_pos() {
+    if (track_.empty()) {
+      throw std::exception();
+    }
+    return track_.back();
+  }
 
   //
 
-  size_t get_length() { return length; }
+  size_t get_length() { return length_; }
 
-  void set_length(size_t length) { this->length = length; }
+  void set_length(size_t length) { length_ = length; }
 
   void inc_length(int inc) {
-    if (-inc > static_cast<int>(length)) {
-      length = 0;
+    if (-inc > static_cast<int>(length_)) {
+      length_ = 1;
     } else {
-      length += inc;
+      length_ += inc;
     }
   }
 
   //
 
-  bool touches(const Snake &other);
+  bool touches(const SnakeObject &other);
 
 protected:
+  const Config canvas_config_;
+
+  size_t length_;
   std::deque<Veci> track_;
 };
+
+} // namespace canvas
+
+class Snake : public canvas::SnakeObject, public GameObject {
+public:
+  struct Config {
+    double speed;
+    float move_interval;
+  };
+
+  Snake(canvas::SnakeObject::Config canvas_config, Config snake_config,
+        Map &map)
+      : SnakeObject(canvas_config), snake_config_(snake_config), map_(map),
+        real_pos_(canvas_config.obj.pos) {}
+
+  void act(float dt) override {
+    int eaten = map_.eat(utils::to_world_coord(get_pos()), 20);
+    inc_length(eaten);
+
+    change_direction(dt);
+
+    move(dt);
+  }
+
+  void draw(Veci offset) override { SnakeObject::draw(offset); }
+
+protected:
+  virtual void change_direction(float dt) = 0;
+
+  virtual void move(float dt) {
+    real_pos_ += direction_ * dt * snake_config_.speed;
+    move_time_delta_ += dt;
+    if (move_time_delta_ > snake_config_.move_interval) {
+      move_time_delta_ -= snake_config_.move_interval;
+      add(Veci(real_pos_));
+    }
+  }
+
+protected:
+  const Config snake_config_;
+  Map &map_;
+
+  Vecf real_pos_;
+  Vecf direction_ = {};
+  float move_time_delta_ = 0;
+};

src/Game.cpp

@@ -12,8 +12,6 @@
 #include "Utils.hpp"
 #include "World.hpp"
 
-constexpr double MIN_CONTROL_DISTANCE = 10;
-
 //
 //  You are free to modify this file
 //
@@ -31,14 +29,6 @@ void initialize() { std::srand(std::time(0)); }
 
 float game_time = 0.0f;
 
-Player player{
-    .pos = {.x = 20, .y = 20},
-    .direction = {.x = 1.0, .y = 0.0},
-    .speed = 200.0,
-    .move_interval = 0.01,
-    .move_time_delta = 0,
-};
-
 World world;
 
 Map map{{
@@ -51,13 +41,18 @@ Map map{{
     .food_color = {color::RED},
 }};
 
-// std::vector<Worm> bots; // TODO
+Player player{canvas::SnakeObject::Config{
+                  .obj = {.pos = {}, .color = {color::GREEN}},
+                  .initial_length = 10,
+                  .radius = 10,
+              },
+              Snake::Config{
+                  .speed = 200.0,
+                  .move_interval = 0.01,
+              },
+              map};
 
-auto snake = Snake(canvas::SnakeObject{
-    {.pos = Veci(player.pos), .color = {color::GREEN}},
-    10,
-    10,
-});
+// std::vector<Bot> bots; // TODO
 
 // this function is called to update game data,
 // dt - time elapsed since the previous update (in seconds)
@@ -68,30 +63,11 @@ void act(float dt) {
 
   map.act(dt);
 
-  world.cursor = utils::get_cursor();
-  if (world.cursor != world.prev_cursor and utils::is_on_screen(world.cursor)) {
-    Vecf diff(world.cursor - utils::get_screen_center()); // - pos;
-
-    if (diff.len() > MIN_CONTROL_DISTANCE) {
-      player.direction = diff.norm();
-    }
-  }
-
-  player.pos += player.direction * dt * player.speed;
+  player.act(dt);
 
   game_time += dt;
   world.prev_cursor = world.cursor;
 
-  player.move_time_delta += dt;
-  if (player.move_time_delta > player.move_interval) {
-    player.move_time_delta -= player.move_interval;
-    snake.add(Veci(player.pos));
-  }
-
-  int eaten = map.eat(
-      utils::to_world_coord(Veci(player.pos) + utils::get_screen_center()), 20);
-  snake.inc_length(eaten);
-
   // TODO
   // for (const auto &bot : bots) {
   //   if (snake.touches(bot)) { // GAME OVER
@@ -110,9 +86,9 @@ void draw() {
   // clear backbuffer
   memset(buffer, 0, SCREEN_HEIGHT * SCREEN_WIDTH * sizeof(uint32_t));
 
-  Veci map_offset = Veci(snake.get_pos());
+  Veci map_offset = Veci(player.get_pos());
 
-  snake.draw(map_offset - utils::get_screen_center());
+  player.draw(map_offset);
   map.draw(map_offset);
 }
 

src/Snake.cpp

@@ -1,25 +1,29 @@
 #include "Snake.hpp"
 
-void Snake::add(Veci pos) {
-  this->pos = pos;
+namespace canvas {
+
+void SnakeObject::add(Veci pos) {
   track_.push_back(pos);
-  if (track_.size() > length) {
+  if (track_.size() > length_) {
     track_.pop_front();
   }
 }
 
-void Snake::draw(Veci offset) const {
+void SnakeObject::draw(Veci offset) const {
   for (const auto &pos : track_) {
-    paint::circle({{.pos = pos - offset, .color = color}, radius});
+    paint::circle({{.pos = pos - offset, .color = canvas_config_.obj.color},
+                   canvas_config_.radius});
   }
 }
 
-bool Snake::touches(const Snake &other) {
-  int dist = radius + other.radius;
+bool SnakeObject::touches(const SnakeObject &other) {
+  int dist = canvas_config_.radius + other.canvas_config_.radius;
   for (const auto &elem : other.track_) {
-    if ((pos - elem).len_sq() < dist * dist) {
+    if ((get_pos() - elem).len_sq() < dist * dist) {
       return true;
     }
   }
   return false;
 }
+
+} // namespace canvas