1 files changed, 32 insertions, 0 deletions

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+#include "behaviour_system.h"
+#include <random>
+#include "game.h"
+#include "character_system.h"
+#include "direction.h"
+
+void BehaviourSystem::tick(double dt) {
+  timer_.accumulate(dt);
+  while (timer_.step()) {
+    for (int spriteId : game_.getSprites()) {
+      Sprite& sprite = game_.getSprite(spriteId);
+      if (sprite.wander) {
+        // 75% chance of changing what's happening
+        if (std::bernoulli_distribution(0.75)(game_.getRng())) {
+          // 50% chance of choosing a direction or stopping
+          if (std::bernoulli_distribution(0.5)(game_.getRng())) {
+            Direction dir;
+            switch (std::uniform_int_distribution(0,3)(game_.getRng())) {
+              case 0: dir = Direction::left; break;
+              case 1: dir = Direction::up; break;
+              case 2: dir = Direction::right; break;
+              default: dir = Direction::down; break;
+            }
+            game_.getSystem<CharacterSystem>().moveInDirection(spriteId, dir);
+          } else {
+            game_.getSystem<CharacterSystem>().stopDirecting(spriteId);
+          }
+        }
+      }
+    }
+  }
+}