text rendering + food couter, minor fixes

include/Map.hpp

@@ -89,12 +89,12 @@ private:
           .gen = current_gen_,
           .pos =
               {
-                  .x = std::rand() % config_.size.x,
-                  .y = std::rand() % config_.size.y,
+                  .x = utils::rand_to(config_.size.x),
+                  .y = utils::rand_to(config_.size.y),
               },
           .weight = config_.min_food_weight +
-                    std::rand() % std::abs(config_.max_food_weight -
-                                           config_.min_food_weight),
+                    utils::rand_to(std::abs(config_.max_food_weight -
+                                            config_.min_food_weight)),
       });
     }
   }

include/Snake.hpp

@@ -11,7 +11,7 @@ class SnakeObject {
 public:
   struct Config {
     Object obj;
-    size_t initial_length;
+    uint initial_length;
     int radius;
   };
 
@@ -34,12 +34,14 @@ public:
 
   //
 
-  size_t get_length() { return length_; }
+  uint get_length() { return length_; }
 
-  void set_length(size_t length) { length_ = length; }
+  uint get_initial_length() { return canvas_config_.initial_length; }
+
+  void set_length(uint length) { length_ = length; }
 
   void inc_length(int inc) {
-    if (-inc > static_cast<int>(length_)) {
+    if (-inc > int(length_)) {
       length_ = 1;
     } else {
       length_ += inc;
@@ -85,14 +87,7 @@ public:
 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_));
-    }
-  }
+  virtual void move(float dt);
 
 protected:
   const Config snake_config_;

include/Text.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "Canvas.hpp"
+
+namespace canvas {
+
+struct Text : public Object {
+  uint scale;
+  uint value;
+};
+
+} // namespace canvas
+
+namespace paint {
+
+void text(const canvas::Text &t);
+
+} // namespace paint

include/Utils.hpp

@@ -56,6 +56,15 @@ template <typename T> inline Vec<T> to_world_coord(Vec<T> pos) {
   };
 }
 
+inline int rand_to(int x) {
+  if (std::abs(x) <= 1) {
+    return 0;
+  }
+
+  bool is_negative = x < 0;
+  return (is_negative ? -1 : 1) + rand() % std::abs(x);
+}
+
 } // namespace utils
 
 namespace color {

src/Canvas.cpp

@@ -2,7 +2,7 @@
 
 #include "Utils.hpp"
 
-using namespace utils;
+using utils::screen_at;
 
 namespace paint {
 

src/Game.cpp

@@ -9,6 +9,7 @@
 #include "Params.hpp"
 #include "Player.hpp"
 #include "Snake.hpp"
+#include "Text.hpp"
 #include "Utils.hpp"
 #include "World.hpp"
 
@@ -90,6 +91,12 @@ void draw() {
 
   player.draw(map_offset);
   map.draw(map_offset);
+
+  paint::text({
+      {.pos = {.x = 10, .y = 10}, .color = {color::BLUE}},
+      5,
+      player.get_length() - player.get_initial_length(),
+  });
 }
 
 // free game data in this function

src/Snake.cpp

@@ -27,3 +27,12 @@ bool SnakeObject::touches(const SnakeObject &other) {
 }
 
 } // namespace canvas
+
+void Snake::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_));
+  }
+}

src/Text.cpp

@@ -0,0 +1,161 @@
+#include "Text.hpp"
+
+#include <string>
+
+using utils::screen_at;
+
+constexpr uint LETTER_WIDTH = 4;
+constexpr uint LETTER_HEIGHT = 6;
+
+using Letter = bool[LETTER_WIDTH][LETTER_HEIGHT];
+
+namespace utils {
+
+constexpr Letter letter_0 = {
+    {1, 1, 1, 1, 1},
+    {1, 0, 0, 0, 1},
+    {1, 0, 0, 0, 1},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_1 = {
+    {0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_2 = {
+    {1, 0, 1, 1, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 1, 1, 0, 1},
+};
+
+constexpr Letter letter_3 = {
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_4 = {
+    {1, 1, 1, 0, 0},
+    {0, 0, 1, 0, 0},
+    {0, 0, 1, 0, 0},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_5 = {
+    {1, 1, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 1, 1},
+};
+
+constexpr Letter letter_6 = {
+    {1, 1, 1, 1, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 1, 1},
+};
+
+constexpr Letter letter_7 = {
+    {1, 0, 0, 0, 0},
+    {1, 0, 0, 0, 0},
+    {1, 0, 0, 0, 0},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_8 = {
+    {1, 1, 1, 1, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_9 = {
+    {1, 1, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 0, 1, 0, 1},
+    {1, 1, 1, 1, 1},
+};
+
+constexpr Letter letter_undef = {
+    {0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0},
+};
+
+} // namespace utils
+
+namespace paint {
+
+void text(const canvas::Text &t) {
+  std::string value_str = std::to_string(t.value);
+  size_t offset = 0;
+  for (const auto &ch : value_str) {
+    const Letter *letter = nullptr;
+    switch (ch) {
+    case '0':
+      letter = &utils::letter_0;
+      break;
+    case '1':
+      letter = &utils::letter_1;
+      break;
+    case '2':
+      letter = &utils::letter_2;
+      break;
+    case '3':
+      letter = &utils::letter_3;
+      break;
+    case '4':
+      letter = &utils::letter_4;
+      break;
+    case '5':
+      letter = &utils::letter_5;
+      break;
+    case '6':
+      letter = &utils::letter_6;
+      break;
+    case '7':
+      letter = &utils::letter_7;
+      break;
+    case '8':
+      letter = &utils::letter_8;
+      break;
+    case '9':
+      letter = &utils::letter_9;
+      break;
+    default:
+      letter = &utils::letter_undef;
+      break;
+    }
+
+    for (uint i = 0; i < LETTER_WIDTH; ++i) {
+      for (uint j = 0; j < LETTER_HEIGHT; ++j) {
+        if ((*letter)[i][j]) {
+          for (uint k = 0; k < t.scale; ++k) {
+            int pixel_offset_y =
+                i * t.scale + offset * (LETTER_WIDTH + 1) * t.scale;
+            int pixel_offset_x = j * t.scale + k;
+            std::fill(screen_at({
+                          .x = t.pos.x + pixel_offset_x,
+                          .y = t.pos.y + pixel_offset_y,
+                      }),
+                      screen_at({
+                          .x = t.pos.x + pixel_offset_x,
+                          .y = t.pos.y + pixel_offset_y + int(t.scale),
+                      }),
+                      t.color.v);
+          }
+        }
+      }
+    }
+
+    ++offset;
+  }
+}
+
+} // namespace paint