add cancel parameter for Spawner::for_each

main.cpp

@@ -9,24 +9,15 @@
 #include "spawner.h"
 #include "types.h"
 
-float screen_width = 800;
-float screen_height = 600;
-
-float padding = 50;
-float level_width = screen_width - padding * 2;
-float level_height = screen_height - padding * 2;
-float level_left = padding;
-float level_top = padding;
-float level_right = level_width + padding;
-float level_bottom = level_height + padding;
+Viewport viewport{800, 600};
 
 Rectangle walls[] = {};
 
 float player_width = 50;
 Player player = {
     .rect = {
-        .x = level_width / 2 - player_width / 2,
-        .y = level_height / 2 - player_width / 2,
+        .x = viewport.level_width / 2 - player_width / 2,
+        .y = viewport.level_height / 2 - player_width / 2,
         .width = player_width,
         .height = player_width,
     },
@@ -61,8 +52,8 @@ bool Player::is_invulnerable(const double now) const noexcept {
 void Player::move(const Vector2 delta) {
     const auto [next_x, next_y] = Vector2Clamp(
         Vector2Add({this->rect.x, this->rect.y}, delta),
-        {level_left, level_top},
-        Vector2Subtract({level_right, level_bottom}, {this->rect.width, this->rect.height})
+        {viewport.level_left, viewport.level_top},
+        Vector2Subtract({viewport.level_right, viewport.level_bottom}, {this->rect.width, this->rect.height})
     );
 
     bool collided = false;
@@ -94,35 +85,38 @@ struct EnemySpawner final : Spawner<Enemy, 100> {
 
     void spawn() override {
         const auto num = Rng::generate();
-        const auto starting_x = Rng::generate(static_cast<int>(level_left), static_cast<int>(level_right));
-        const auto starting_y = Rng::generate(static_cast<int>(level_top), static_cast<int>(level_bottom));
+        const auto starting_x = Rng::generate(static_cast<int>(viewport.level_left),
+                                              static_cast<int>(viewport.level_right));
+        const auto starting_y = Rng::generate(static_cast<int>(viewport.level_top),
+                                              static_cast<int>(viewport.level_bottom));
 
-        for (auto &[center, radius, speed, alive]: this->values) {
-            if (alive) continue;
-            alive = true;
-            radius = enemy_radius;
+        for (auto &enemy: this->values) {
+            if (enemy.alive()) continue;
+            enemy.radius = enemy_radius;
+            auto hp = Rng::generate(1, 4);
+            enemy.hp = static_cast<uint32_t>(hp);
             if (num < 0.25) {
-                center = {.x = starting_x, .y = level_top};
+                enemy.center = {.x = starting_x, .y = viewport.level_top};
             } else if (0.25 <= num && num < 0.5) {
-                center = {
-                    .x = starting_x, .y = level_bottom
+                enemy.center = {
+                    .x = starting_x, .y = viewport.level_bottom
                 };
             } else if (0.5 <= num && num < 0.75) {
-                center = {.x = level_left, .y = starting_y};
+                enemy.center = {.x = viewport.level_left, .y = starting_y};
             } else {
-                center = {
-                    .x = level_right, .y = starting_y
+                enemy.center = {
+                    .x = viewport.level_right, .y = starting_y
                 };
             }
 
-            speed = Rng::generate(static_cast<uint32_t>(enemy_max_speed));
+            enemy.speed = Rng::generate(static_cast<uint32_t>(enemy_max_speed));
 
             break;
         }
     }
 };
 
-EnemySpawner enemy_spawner{2};
+EnemySpawner enemy_spawner{1};
 
 struct ItemSpawner final : Spawner<Item, 100> {
     explicit ItemSpawner(const long long rate_secs) : Spawner<Item, 100>(rate_secs) {
@@ -130,8 +124,8 @@ struct ItemSpawner final : Spawner<Item, 100> {
 
     void spawn() override {
         const auto item_type = static_cast<ItemType>(Rng::generate(ITEM_TYPE_COUNT));
-        const auto x = Rng::generate(static_cast<int>(level_left), static_cast<int>(level_right));
-        const auto y = Rng::generate(static_cast<int>(level_top), static_cast<int>(level_bottom));
+        const auto x = Rng::generate(static_cast<int>(viewport.level_left), static_cast<int>(viewport.level_right));
+        const auto y = Rng::generate(static_cast<int>(viewport.level_top), static_cast<int>(viewport.level_bottom));
 
         for (auto &item: this->values) {
             if (item.active) continue;
@@ -170,11 +164,11 @@ void update_tears() {
                 }
             }
 
-            enemy_spawner.for_each([&center, &active](auto &enemy) {
-                if (enemy.alive && CheckCollisionCircles(center, player.tear_radius, enemy.center, enemy.radius)) {
+            enemy_spawner.for_each([&center, &active](auto &enemy, auto& cancel) {
+                if (enemy.alive() && CheckCollisionCircles(center, player.tear_radius, enemy.center, enemy.radius)) {
                     active = false;
-                    enemy.alive = false;
-                    score++;
+                    if (--enemy.hp == 0) score++;
+                    cancel = true;
                 }
             });
 
@@ -217,18 +211,12 @@ int main() {
     std::string item_pickup_text_buffer;
     item_pickup_text_buffer.reserve(64);
     double item_last_picked_up = 0;
-    double item_pickup_message_duration = 3;
 
     while (!WindowShouldClose()) {
+        constexpr double item_pickup_message_duration = 3;
+        // float dt_secs = GetFrameTime();
         if (IsWindowResized()) {
-            screen_height = static_cast<float>(GetScreenHeight());
-            screen_width = static_cast<float>(GetScreenWidth());
-            level_width = screen_width - padding * 2;
-            level_height = screen_height - padding * 2;
-            level_left = padding;
-            level_top = padding;
-            level_right = level_width + padding;
-            level_bottom = level_height + padding;
+            viewport = {static_cast<float>(GetScreenWidth()), static_cast<float>(GetScreenHeight())};
         }
 
 
@@ -264,7 +252,8 @@ int main() {
 
         BeginDrawing();
         ClearBackground(GRAY);
-        DrawRectangle(50, 50, static_cast<int>(level_width), static_cast<int>(level_height), RAYWHITE);
+        DrawRectangle(50, 50, static_cast<int>(viewport.level_width), static_cast<int>(viewport.level_height),
+                      RAYWHITE);
         DrawRectangleRec(player.rect, player.is_invulnerable(now) ? GOLD : BLUE);
 
         for (const auto wall: walls) {
@@ -277,14 +266,16 @@ int main() {
             }
         }
 
-        enemy_spawner.for_each([now](Enemy &enemy) {
-            if (enemy.alive) {
+        enemy_spawner.for_each([now](Enemy &enemy, auto& cancel) {
+            if (enemy.alive()) {
                 enemy.center = Vector2MoveTowards(enemy.center, player.center(), enemy.speed);
-                DrawCircleV(enemy.center, enemy.radius, RED);
+                const Color enemy_color = enemy.hp == 1 ? PINK : enemy.hp == 2 ? ORANGE : RED;
+                DrawCircleV(enemy.center, enemy.radius, enemy_color);
 
-                if (enemy.center.x < level_left || level_right < enemy.center.x ||
-                    enemy.center.y < level_top || level_bottom < enemy.center.y) {
-                    enemy.alive = false;
+                if (enemy.center.x < viewport.level_left || viewport.level_right < enemy.center.x ||
+                    enemy.center.y < viewport.level_top || viewport.level_bottom < enemy.center.y) {
+                    // Basically removing the enemy from the pool;
+                    enemy.hp = 0;
                 }
 
                 if (CheckCollisionCircleRec(enemy.center, enemy.radius, player.rect) &&
@@ -295,7 +286,7 @@ int main() {
             }
         });
 
-        item_spawner.for_each([&item_pickup_text_buffer, now, &item_last_picked_up](Item &item) {
+        item_spawner.for_each([&item_pickup_text_buffer, now, &item_last_picked_up](Item &item, auto& cancel) {
             if (!item.active) return;
 
             DrawCircleV(item.center, item.radius, item.color());
@@ -327,21 +318,22 @@ int main() {
             }
         });
 
-        const int text_left = static_cast<int>(level_left) + 10;
+        const int text_left = static_cast<int>(viewport.level_left) + 10;
 
-        DrawRectangle(static_cast<int>(level_left), static_cast<int>(level_height) - 110, 200, 110,
+        DrawRectangle(static_cast<int>(viewport.level_left), static_cast<int>(viewport.level_height) - 110, 200, 110,
                       {130, 130, 130, 100});
 
         std::format_to(std::back_inserter(score_text_buffer), "Score: {}", score);
-        DrawText(score_text_buffer.c_str(), text_left, static_cast<int>(level_height) - 100, 20, BLACK);
+        DrawText(score_text_buffer.c_str(), text_left, static_cast<int>(viewport.level_height) - 100, 20, BLACK);
         score_text_buffer.clear();
 
         std::format_to(std::back_inserter(lives_text_buffer), "Lives: {}", player.lives);
-        DrawText(lives_text_buffer.c_str(), text_left, static_cast<int>(level_height) - 75, 20, BLACK);
+        DrawText(lives_text_buffer.c_str(), text_left, static_cast<int>(viewport.level_height) - 75, 20, BLACK);
         lives_text_buffer.clear();
 
         if (now < item_last_picked_up + item_pickup_message_duration && !item_pickup_text_buffer.empty()) {
-            DrawText(item_pickup_text_buffer.c_str(), text_left, static_cast<int>(level_height) - 50, 20, BLACK);
+            DrawText(item_pickup_text_buffer.c_str(), text_left, static_cast<int>(viewport.level_height) - 50, 20,
+                     BLACK);
         }
 
         if (item_last_picked_up + item_pickup_message_duration <= now && !item_pickup_text_buffer.empty()) {

rng.cpp

@@ -13,5 +13,5 @@ float Rng::generate(const uint32_t max) {
 }
 
 float Rng::generate(const int min, const int max) {
-    return generate() * (static_cast<float>(max) - static_cast<float>(min)) + static_cast<float>(min);
+    return generate(max - min) + static_cast<float>(min);
 }

spawner.h

@@ -24,7 +24,9 @@ struct Spawner {
     void for_each(F&& func) {
         std::lock_guard lock{mutex};
         for (auto& value : values) {
-            func(value);
+            bool cancel = false;
+            func(value, cancel);
+            if (cancel) break;;
         }
     }
 

types.h

@@ -49,7 +49,8 @@ struct Enemy {
     Vector2 center;
     float radius;
     float speed;
-    bool alive;
+    uint32_t hp;
+    [[nodiscard]] bool alive() const noexcept { return hp != 0; }
 };
 
 enum ItemType {
@@ -122,3 +123,33 @@ struct Item {
         assert(0 && "Unreachable.");
     }
 };
+
+struct Viewport {
+    Viewport() = default;
+
+    Viewport(const float screen_width, const float screen_height)
+        : screen_width(screen_width),
+          screen_height(screen_height),
+          padding(50),
+          level_width(screen_width - padding * 2),
+          level_height(screen_height - padding * 2),
+          level_left(padding),
+          level_top(padding),
+          level_right(level_width + padding),
+          level_bottom(level_height + padding) {
+    }
+
+    Viewport& operator=(const Viewport &other) = default;
+
+    float screen_width;
+    float screen_height;
+
+    float padding;
+
+    float level_width;
+    float level_height;
+    float level_left;
+    float level_top;
+    float level_right;
+    float level_bottom;
+};