feat(enemy): migrar el moviment dels enemics a un sistema d'IA declaratiu

2026-05-25 17:45:30 +02:00
parent 410955de3c
commit 61e40e88f4
8 changed files with 379 additions and 95 deletions
@@ -0,0 +1,120 @@
+// enemy_ai_system.cpp - Implementació del dispatcher de moviment d'enemics
+// © 2026 JailDesigner
+
+#include "game/systems/enemy_ai_system.hpp"
+
+#include <cmath>
+#include <cstdlib>
+
+#include "core/types.hpp"
+#include "game/constants.hpp"
+#include "game/entities/enemy.hpp"
+#include "game/entities/enemy_ai.hpp"
+#include "game/entities/enemy_config.hpp"
+
+namespace Systems::EnemyAi {
+
+    namespace {
+
+        auto randFloat01() -> float {
+            return static_cast<float>(std::rand()) / static_cast<float>(RAND_MAX);
+        }
+
+        auto velocityToAngle(const Vec2& velocity) -> float {
+            if (velocity.lengthSquared() < 0.0001F) {
+                return 0.0F;
+            }
+            return std::atan2(velocity.y, velocity.x) + (Constants::PI / 2.0F);
+        }
+
+        // ZIGZAG: canvi de direcció probabilístic. Còpia literal del legacy
+        // Enemy::behaviorPentagon.
+        void moveZigzag(Enemy& enemy, float delta_time) {
+            const auto& mv = enemy.getConfig().ai.movement;
+            EnemyAiState& state = enemy.getAiState();
+            state.direction_change_timer += delta_time;
+
+            if (randFloat01() < mv.zigzag_prob_per_second * delta_time) {
+                const Vec2 VEL = enemy.getBody().velocity;
+                const float CURRENT_ANGLE = velocityToAngle(VEL);
+                const float DELTA = randFloat01() * mv.angle_change_max;
+                const float NEW_ANGLE = CURRENT_ANGLE + ((std::rand() % 2 == 0) ? DELTA : -DELTA);
+                const float SPEED = VEL.length();
+                enemy.setVelocityFromAngle(NEW_ANGLE, SPEED);
+                state.direction_change_timer = 0.0F;
+            }
+        }
+
+        // TRACKING: cada N segons, interpola la velocitat actual cap a la
+        // direcció del ship mantenint la mateixa magnitud. Còpia literal del
+        // legacy Enemy::behaviorSquare.
+        void moveTracking(Enemy& enemy, float delta_time) {
+            const auto& mv = enemy.getConfig().ai.movement;
+            EnemyAiState& state = enemy.getAiState();
+            state.tracking_timer += delta_time;
+
+            const Vec2* ship_pos = enemy.getShipPosition();
+            if (state.tracking_timer < mv.tracking_interval || ship_pos == nullptr) {
+                return;
+            }
+            state.tracking_timer = 0.0F;
+
+            const Vec2 TO_SHIP = *ship_pos - enemy.getCenter();
+            const float DIST = TO_SHIP.length();
+            if (DIST <= 0.0F) {
+                return;
+            }
+            const Vec2 DESIRED_DIR = TO_SHIP / DIST;
+            const float SPEED = enemy.getBody().velocity.length();
+            const Vec2 DESIRED_VEL = DESIRED_DIR * SPEED;
+            const float STRENGTH = state.tracking_strength;
+
+            Vec2 new_vel = (enemy.getBody().velocity * (1.0F - STRENGTH)) +
+                (DESIRED_VEL * STRENGTH);
+
+            const float NEW_SPEED = new_vel.length();
+            if (NEW_SPEED > 0.0F) {
+                new_vel = new_vel * (SPEED / NEW_SPEED);
+            }
+            enemy.getBody().velocity = new_vel;
+        }
+
+        // RECTILINEAR_PROXIMITY: rectilini (cap modificació a velocity); boost
+        // de rotació visual quan distància al ship < proximity_distance. Còpia
+        // literal del legacy Enemy::behaviorPinwheel.
+        void moveRectilinearProximity(Enemy& enemy, float /*delta_time*/) {
+            const auto& mv = enemy.getConfig().ai.movement;
+            const Vec2* ship_pos = enemy.getShipPosition();
+            if (ship_pos == nullptr) {
+                return;
+            }
+            const Vec2 TO_SHIP = *ship_pos - enemy.getCenter();
+            const float DIST = TO_SHIP.length();
+            const float BASE = enemy.getRotationBase();
+            if (DIST < mv.proximity_distance) {
+                enemy.setRotationDelta(BASE * mv.rotation_proximity_multiplier);
+            } else {
+                enemy.setRotationDelta(BASE);
+            }
+        }
+
+    }  // namespace
+
+    void tick(Enemy& enemy, float delta_time) {
+        if (!enemy.isActive() || enemy.isWounded()) {
+            return;
+        }
+        switch (enemy.getConfig().ai.movement.type) {
+            case MovementType::ZIGZAG:
+                moveZigzag(enemy, delta_time);
+                break;
+            case MovementType::TRACKING:
+                moveTracking(enemy, delta_time);
+                break;
+            case MovementType::RECTILINEAR_PROXIMITY:
+                moveRectilinearProximity(enemy, delta_time);
+                break;
+        }
+    }
+
+}  // namespace Systems::EnemyAi