initial game

include/Canvas.hpp

@@ -1,12 +1,9 @@
 #pragma once
 
-#include <algorithm>
 #include <cmath>
-#include <vector>
-#
 
 #include "Engine.h"
-#include "Utils.hpp"
+#include "Vec.hpp"
 
 enum class Color : uint32_t {
   BLACK = 0x000000ff,
@@ -25,99 +22,27 @@ constexpr Color CL_BG = Color::BLACK;
 
 using Screen = uint32_t[SCREEN_HEIGHT][SCREEN_WIDTH];
 
-class CanvasObject {
-public:
-  struct Config {
-    Veci pos;
-    int size;
-    Color color = Color ::WHITE;
-  };
-  CanvasObject(Config config)
-      : pos_(config.pos), size_(config.size), color_(config.color),
-        shown_(false) {}
+namespace canvas {
 
-  virtual void move_to(Veci) = 0;
-  virtual void show() = 0;
-  virtual void hide() = 0;
-
-  virtual ~CanvasObject() {
-    if (shown_) {
-      // hide(); // TODO
-    }
-  }
-
-protected:
-  Veci pos_;
-  int size_;
-  Color color_;
-  bool shown_;
+struct Object {
+  Veci pos;
+  Color color;
 };
 
-class StatelessCanvasObject : public CanvasObject {
-public:
-  using CanvasObject::CanvasObject;
-
-  void move_to(Veci pos) override {
-    if (not shown_) {
-      return;
-    }
-    hide();
-    pos_ = pos;
-    show();
-  }
-
-  void show() override { fill(color_); }
-
-  void hide() override { fill(CL_BG); }
-
-protected:
-  virtual void fill(Color color) = 0;
+struct Square : public Object {
+  int side;
 };
 
-class Square : public StatelessCanvasObject {
-public:
-  using StatelessCanvasObject::StatelessCanvasObject;
-
-protected:
-  void fill(Color color) override {
-    for (int x = pos_.x; x < pos_.x + size_; ++x) {
-      std::fill(screen_at(x, pos_.y), screen_at(x, pos_.y + size_),
-                static_cast<uint32_t>(color));
-    }
-  }
+struct Circle : public Object {
+  int radius;
 };
 
-class Circle : public StatelessCanvasObject {
-public:
-  using StatelessCanvasObject::StatelessCanvasObject;
+} // namespace canvas
 
-protected:
-  void fill(Color color) override {
-    for (int x = -size_; x < size_; ++x) {
-      int size_y = std::sqrt(size_ * size_ - std::abs(x) * std::abs(x));
-      std::fill(screen_at(pos_.x + x, pos_.y - size_y),
-                screen_at(pos_.x + x, pos_.y + size_y),
-                static_cast<uint32_t>(color));
-    }
-  }
-};
+namespace paint {
 
-class Worm : public CanvasObject {
-  Worm(CanvasObject::Config config, size_t max_track_size)
-      : CanvasObject(config), max_track_size_(max_track_size) {}
+void square(const canvas::Square &s);
 
-protected:
-  const size_t max_track_size_;
-  std::vector<Circle> track_;
-};
+void circle(const canvas::Circle &c);
 
-// class Canvas {
-// public:
-//   Canvas(Screen &screen) : screen_(screen) {}
-
-//   size_t insert(CanvasObject obj) {}
-//   void erase(size_t id) {}
-
-// private:
-//   Screen &screen_;
-// };
+} // namespace paint

include/Map.hpp

@@ -2,6 +2,7 @@
 
 #include <deque>
 
+#include "Canvas.hpp"
 #include "Utils.hpp"
 #include "Vec.hpp"
 
@@ -13,17 +14,23 @@ class Map : public GameObject {
     bool eaten = false;
   };
 
-  static constexpr double GEN_INTERVAL = 1.0;
-  static constexpr size_t FOOD_EXISTS_GENS = 10;
-  static constexpr size_t GEN_FOOD_COUNT = 1000;
-  static constexpr int SIZE_X = 20000;
-  static constexpr int SIZE_Y = 20000;
-
 public:
+  struct Config {
+    double gen_interval;
+    size_t food_exists_gens;
+    size_t gen_food_count;
+    Veci size;
+    int min_food_weight;
+    int max_food_weight;
+    Color food_color;
+  };
+
+  Map(Config config) : config_(config) {}
+
   void act(float dt) override {
     time_from_last_gen_ += dt;
-    if (time_from_last_gen_ > GEN_INTERVAL) {
-      time_from_last_gen_ -= GEN_INTERVAL;
+    if (time_from_last_gen_ > config_.gen_interval) {
+      time_from_last_gen_ -= config_.gen_interval;
       generate();
     }
   }
@@ -39,23 +46,36 @@ public:
     return eaten_weight;
   }
 
-  void draw() override {} // TODO
-
-private:
-  void generate() {
-    ++current_gen_;
-    while (food_.front().gen + FOOD_EXISTS_GENS < current_gen_) {
-      food_.pop_front();
-    }
-
-    for (size_t i = 0; i < GEN_FOOD_COUNT; ++i) {
-      food_.push_back({.gen = current_gen_,
-                       .pos = {.x = rand() % SIZE_X, .y = rand() % SIZE_Y},
-                       .weight = 1});
+  void draw(Veci offset) override {
+    for (const auto &food : food_) {
+      Veci food_pos = food.pos - offset;
+      if (utils::is_valid_pos(food_pos) and not food.eaten) {
+        paint::circle(
+            {{.pos = food_pos, .color = config_.food_color}, food.weight * 3});
+      }
     }
   }
 
 private:
+  void generate() {
+    ++current_gen_;
+    while (food_.front().gen + config_.food_exists_gens < current_gen_) {
+      food_.pop_front();
+    }
+
+    for (size_t i = 0; i < config_.gen_food_count; ++i) {
+      food_.push_back({
+          .gen = current_gen_,
+          .pos = {.x = rand() % config_.size.x, .y = rand() % config_.size.y},
+          .weight = config_.min_food_weight +
+                    rand() % std::abs(config_.max_food_weight -
+                                      config_.min_food_weight),
+      });
+    }
+  }
+
+private:
+  Config config_;
   double time_from_last_gen_ = 0;
   size_t current_gen_ = 0;
   std::deque<Food> food_ = {};

include/Player.hpp

@@ -1,6 +1,8 @@
 #pragma once
 
-class Player {
-public:
-private:
+#include "Vec.hpp"
+
+struct Player {
+  Vecf pos;
+  Vecf direction;
 };

include/Snake.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <deque>
+
+#include "Canvas.hpp"
+
+namespace canvas {
+
+struct WormObject : public Object {
+  size_t length;
+  int radius;
+};
+
+} // namespace canvas
+
+class Worm : protected canvas::WormObject {
+public:
+  Worm(canvas::WormObject obj) : WormObject(obj), track_{pos} {}
+
+  void add(Veci pos);
+
+  void draw(Veci offset = {}) const;
+
+  size_t get_length() { return length; }
+
+  void set_length(size_t length) { this->length = length; }
+
+  void inc_length(int inc) {
+    if (-inc > static_cast<int>(length)) {
+      length = 0;
+    } else {
+      length += inc;
+    }
+  }
+
+protected:
+  std::deque<Veci> track_;
+};

include/Utils.hpp

@@ -5,6 +5,8 @@
 #include "Engine.h"
 #include "Vec.hpp"
 
+namespace utils {
+
 namespace safe {
 
 inline int lx(int x) { return std::max(0, x); }
@@ -30,12 +32,18 @@ template <typename T> inline bool is_valid_pos(Vec<T> pos) {
 
 inline Veci get_cursor() { return {.x = get_cursor_y(), .y = get_cursor_x()}; }
 
+inline constexpr Veci get_center() {
+  return {.x = SCREEN_HEIGHT / 2, .y = SCREEN_WIDTH / 2};
+}
+
+} // namespace utils
+
 //
 
 class GameObject {
 public:
   virtual void act(float dt) = 0;
-  virtual void draw() = 0;
+  virtual void draw(Veci offset) = 0;
 
   virtual ~GameObject() {}
 };

include/Vec.hpp

@@ -3,13 +3,13 @@
 #include <cmath>
 
 template <typename T> struct Vec {
-  T x;
-  T y;
+  T x = {};
+  T y = {};
 
   //
 
   template <typename U> explicit operator Vec<U>() {
-    return Vec<U>{.x = x, .y = y};
+    return Vec<U>{.x = static_cast<U>(x), .y = static_cast<U>(y)};
   }
 
   //

include/World.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "Vec.hpp"
+
+struct World {
+  float game_time = {};
+  Veci prev_cursor = {};
+  Veci cursor = {};
+};

src/Canvas.cpp

@@ -0,0 +1,25 @@
+#include "Canvas.hpp"
+
+#include "Utils.hpp"
+
+using namespace utils;
+
+namespace paint {
+
+void square(const canvas::Square &s) {
+  for (int x = s.pos.x; x < s.pos.x + s.side; ++x) {
+    std::fill(screen_at(x, s.pos.y), screen_at(x, s.pos.y + s.side),
+              static_cast<uint32_t>(s.color));
+  }
+}
+
+void circle(const canvas::Circle &c) {
+  for (int x = -c.radius; x < c.radius; ++x) {
+    int size_y = std::sqrt(c.radius * c.radius - std::abs(x) * std::abs(x));
+    std::fill(screen_at(c.pos.x + x, c.pos.y - size_y),
+              screen_at(c.pos.x + x, c.pos.y + size_y),
+              static_cast<uint32_t>(c.color));
+  }
+}
+
+} // namespace paint

src/Game.cpp

@@ -6,6 +6,11 @@
 // #include <stdio.h>
 
 #include "Canvas.hpp"
+#include "Map.hpp"
+#include "Player.hpp"
+#include "Snake.hpp"
+#include "Utils.hpp"
+#include "World.hpp"
 
 constexpr double MIN_CONTROL_DISTANCE = 10;
 
@@ -22,12 +27,28 @@ constexpr double MIN_CONTROL_DISTANCE = 10;
 //  left button, 1 - right button) schedule_quit_game() - quit game after act()
 
 // initialize game data in this function
-void initialize() {}
+void initialize() { srand(time(0)); }
 
 float game_time = 0.0f;
-Vecf pos = {.x = 20, .y = 20};
-Vecf direction{.x = 1.0, .y = 0.0};
-Veci prev_cursor = {.x = 0, .y = 0};
+
+Player player{
+    .pos = {.x = 20, .y = 20},
+    .direction = {.x = 1.0, .y = 0.0},
+};
+
+World world;
+
+Map map{{
+    .gen_interval = 1.0,
+    .food_exists_gens = 10,
+    .gen_food_count = 1000,
+    .size = {.x = 20000, .y = 20000},
+    .min_food_weight = 1,
+    .max_food_weight = 10,
+    .food_color = Color::RED,
+}};
+
+auto snake = Worm({{.pos = Veci(player.pos), .color = Color::GREEN}, 100, 10});
 
 // this function is called to update game data,
 // dt - time elapsed since the previous update (in seconds)
@@ -35,23 +56,26 @@ void act(float dt) {
   if (is_key_pressed(VK_ESCAPE))
     schedule_quit_game();
 
-  Veci cursor = get_cursor();
-  if (cursor != prev_cursor and is_valid_pos(cursor)) {
-    Vecf diff = Vecf(cursor) - pos;
+  world.cursor = utils::get_cursor();
+  if (world.cursor != world.prev_cursor and utils::is_valid_pos(world.cursor)) {
+    Vecf diff(world.cursor - utils::get_center()); // - pos;
 
     if (diff.len() > MIN_CONTROL_DISTANCE) {
-      direction = diff.norm();
+      player.direction = diff.norm();
     }
   }
 
   int speed = 200;
-  pos += direction * dt * speed;
+  player.pos += player.direction * dt * speed;
 
   game_time += dt;
-  prev_cursor = cursor;
-  // std::cout << "pos: " << pos.x << ' ' << pos.y << std::endl;
-  // std::cout << "curs: " << get_cursor().x << ' ' << get_cursor().y <<
-  // std::endl;
+  world.prev_cursor = world.cursor;
+
+  snake.add(Veci(player.pos));
+
+  snake.inc_length(map.eat(Veci(player.pos), 30));
+
+  map.act(dt);
 }
 
 // fill buffer in this function
@@ -61,8 +85,11 @@ void draw() {
   // clear backbuffer
   memset(buffer, 0, SCREEN_HEIGHT * SCREEN_WIDTH * sizeof(uint32_t));
 
-  Circle sq({.pos = Veci(pos), .size = 20});
-  sq.show();
+  Veci map_offset = Veci(player.pos) - utils::get_center();
+
+  snake.draw(map_offset);
+  map.draw(map_offset);
+  // paint::circle({{.pos = Veci(pos), .color = Color::ORANGE}, 20});
 }
 
 // free game data in this function

src/Snake.cpp

@@ -0,0 +1,14 @@
+#include "Snake.hpp"
+
+void Worm::add(Veci pos) {
+  track_.push_back(pos);
+  if (track_.size() > length) {
+    track_.pop_front();
+  }
+}
+
+void Worm::draw(Veci offset) const {
+  for (const auto &pos : track_) {
+    paint::circle({{.pos = pos - offset, .color = color}, radius});
+  }
+}