modernization, better food rendering, consistent player moving, snake intersections

include/Canvas.hpp

@@ -3,23 +3,9 @@
 #include <cmath>
 
 #include "Engine.h"
+#include "Utils.hpp"
 #include "Vec.hpp"
 
-enum class Color : uint32_t {
-  BLACK = 0x000000ff,
-  WHITE = 0x00ff6000,
-
-  BLUE = 0x000000ff,
-  GREEN = 0x0000ff00,
-  CYAN = 0x0000ffff,
-  RED = 0x00ff0000,
-  MAGENTA = 0x00ff00ff,
-  YELLOW = 0x00ffff00,
-  GRAY = 0x001f1f1f,
-  ORANGE = 0x00ff6000,
-};
-constexpr Color CL_BG = Color::BLACK;
-
 using Screen = uint32_t[SCREEN_HEIGHT][SCREEN_WIDTH];
 
 namespace canvas {

include/Map.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <deque>
+#include <iostream>
 
 #include "Canvas.hpp"
 #include "Utils.hpp"
@@ -50,8 +51,12 @@ public:
     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});
+        paint::circle({{
+                           .pos = food_pos,
+                           .color = color::scale(config_.food_color,
+                                                 1.0 - food_lasted(food)),
+                       },
+                       food.weight * 2});
       }
     }
   }
@@ -59,21 +64,31 @@ public:
 private:
   void generate() {
     ++current_gen_;
-    while (food_.front().gen + config_.food_exists_gens < 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},
+          .pos =
+              {
+                  .x = std::rand() % config_.size.x,
+                  .y = std::rand() % config_.size.y,
+              },
           .weight = config_.min_food_weight +
-                    rand() % std::abs(config_.max_food_weight -
-                                      config_.min_food_weight),
+                    std::rand() % std::abs(config_.max_food_weight -
+                                           config_.min_food_weight),
       });
     }
   }
 
+  double food_lasted(const Food &food) {
+    return ((current_gen_ - food.gen) * config_.gen_interval +
+            time_from_last_gen_) /
+           (config_.food_exists_gens * config_.gen_interval);
+  }
+
 private:
   Config config_;
   double time_from_last_gen_ = 0;

include/Player.hpp

@@ -5,4 +5,7 @@
 struct Player {
   Vecf pos;
   Vecf direction;
+  double speed;
+  double move_interval;
+  double move_time_delta;
 };

include/Snake.hpp

@@ -21,6 +21,12 @@ public:
 
   void draw(Veci offset = {}) const;
 
+  //
+
+  Veci get_pos() { return pos; }
+
+  //
+
   size_t get_length() { return length; }
 
   void set_length(size_t length) { this->length = length; }
@@ -33,6 +39,10 @@ public:
     }
   }
 
+  //
+
+  bool touches(const Worm &other);
+
 protected:
   std::deque<Veci> track_;
 };

include/Utils.hpp

@@ -38,6 +38,41 @@ inline constexpr Veci get_center() {
 
 } // namespace utils
 
+namespace color {
+
+enum FixedColor : uint32_t {
+  BLACK = 0x000000ff,
+  WHITE = 0x00ff6000,
+
+  BLUE = 0x000000ff,
+  GREEN = 0x0000ff00,
+  CYAN = 0x0000ffff,
+  RED = 0x00ff0000,
+  MAGENTA = 0x00ff00ff,
+  YELLOW = 0x00ffff00,
+  GRAY = 0x001f1f1f,
+  ORANGE = 0x00ff6000,
+};
+constexpr FixedColor BG = BLACK;
+
+struct Color {
+  uint32_t v;
+};
+
+inline Color scale(Color color, double scale) {
+  static constexpr uint32_t COL_BITS = 8;
+  static constexpr uint32_t COMPONENTS = 4;
+  for (uint32_t i = COL_BITS; i < COMPONENTS * COL_BITS; i += COL_BITS) {
+    uint32_t comp = (color.v >> i) % (1 << COL_BITS);
+    color.v -= (comp << i);
+    color.v += (uint32_t(comp * scale) << i);
+  }
+  return color;
+}
+
+} // namespace color
+using color::Color;
+
 //
 
 class GameObject {

src/Canvas.cpp

@@ -8,8 +8,7 @@ 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));
+    std::fill(screen_at(x, s.pos.y), screen_at(x, s.pos.y + s.side), s.color.v);
   }
 }
 
@@ -17,8 +16,7 @@ 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));
+              screen_at(c.pos.x + x, c.pos.y + size_y), c.color.v);
   }
 }
 

src/Game.cpp

@@ -1,11 +1,10 @@
 #include "Engine.h"
-#include <iostream>
+#include <ctime>
 #include <memory.h>
 #include <stdlib.h>
 
 // #include <stdio.h>
 
-#include "Canvas.hpp"
 #include "Map.hpp"
 #include "Player.hpp"
 #include "Snake.hpp"
@@ -27,13 +26,16 @@ 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() { srand(time(0)); }
+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;
@@ -44,17 +46,26 @@ Map map{{
     .gen_food_count = 1000,
     .size = {.x = 20000, .y = 20000},
     .min_food_weight = 1,
-    .max_food_weight = 10,
-    .food_color = Color::RED,
+    .max_food_weight = 5,
+    .food_color = {color::RED},
 }};
 
-auto snake = Worm({{.pos = Veci(player.pos), .color = Color::GREEN}, 100, 10});
+// std::vector<Worm> bots; // TODO
+
+auto snake = Worm(canvas::WormObject{
+    {.pos = Veci(player.pos), .color = {color::GREEN}},
+    10,
+    10,
+});
 
 // this function is called to update game data,
 // dt - time elapsed since the previous update (in seconds)
 void act(float dt) {
-  if (is_key_pressed(VK_ESCAPE))
+  if (is_key_pressed(VK_ESCAPE)) {
     schedule_quit_game();
+  }
+
+  map.act(dt);
 
   world.cursor = utils::get_cursor();
   if (world.cursor != world.prev_cursor and utils::is_valid_pos(world.cursor)) {
@@ -65,17 +76,29 @@ void act(float dt) {
     }
   }
 
-  int speed = 200;
-  player.pos += player.direction * dt * speed;
+  player.pos += player.direction * dt * player.speed;
 
   game_time += dt;
   world.prev_cursor = world.cursor;
 
-  snake.add(Veci(player.pos));
+  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));
+  }
 
-  snake.inc_length(map.eat(Veci(player.pos), 30));
+  int eaten = map.eat(Veci(player.pos), 20);
+  snake.inc_length(eaten);
 
-  map.act(dt);
+  // TODO
+  // for (const auto &bot : bots) {
+  //   if (snake.touches(bot)) { // GAME OVER
+  //     schedule_quit_game();
+  //   }
+  //   if (bot.touches(snake)) {
+  //     // regen bot
+  //   }
+  // }
 }
 
 // fill buffer in this function
@@ -85,11 +108,10 @@ void draw() {
   // clear backbuffer
   memset(buffer, 0, SCREEN_HEIGHT * SCREEN_WIDTH * sizeof(uint32_t));
 
-  Veci map_offset = Veci(player.pos) - utils::get_center();
+  Veci map_offset = Veci(/*player.pos*/ snake.get_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

@@ -1,6 +1,7 @@
 #include "Snake.hpp"
 
 void Worm::add(Veci pos) {
+  this->pos = pos;
   track_.push_back(pos);
   if (track_.size() > length) {
     track_.pop_front();
@@ -12,3 +13,13 @@ void Worm::draw(Veci offset) const {
     paint::circle({{.pos = pos - offset, .color = color}, radius});
   }
 }
+
+bool Worm::touches(const Worm &other) {
+  int dist = radius + other.radius;
+  for (const auto &elem : other.track_) {
+    if ((pos - elem).len_sq() < dist * dist) {
+      return true;
+    }
+  }
+  return false;
+}