Started working on the loot system which will eventually become the inventory/improved collision system.

components.hpp

@@ -22,9 +22,9 @@ namespace components {
     DEFINE_SERIALIZABLE(Motion, dx, dy);
   };
 
-  struct Treasure {
+  struct Loot {
     int amount;
-    DEFINE_SERIALIZABLE(Treasure, amount);
+    DEFINE_SERIALIZABLE(Loot, amount);
   };
 
   struct Tile {

dinkyecs.hpp

@@ -74,6 +74,13 @@ namespace DinkyECS {
         return std::any_cast<Comp&>(res);
       }
 
+    template <typename Comp>
+      bool has(Entity ent) {
+        EntityMap &map = entity_map_for<Comp>();
+        // use .at for bounds checking
+        return map.contains(ent);
+      }
+
     template<typename Comp>
       void query(std::function<void(const Entity&, Comp&)> cb) {
         EntityMap &map = entity_map_for<Comp>();

main.cpp

@@ -41,8 +41,8 @@ void configure_world(DinkyECS::World &world, Map &game_map) {
   world.set<Tile>(enemy2, {"*"});
 
   auto gold = world.entity();
-  world.set<Position>(gold, {game_map.place_entity(game_map.room_count() - 1)});
-  world.set<Treasure>(gold, {100});
+  world.set<Position>(gold, {game_map.place_entity(3)});
+  world.set<Loot>(gold, {100});
   world.set<Tile>(gold, {"$"});
 }
 

systems.cpp

@@ -7,6 +7,7 @@
 #include "events.hpp"
 #include "ftxui/screen/color.hpp"
 #include "ftxui/screen/terminal.hpp"  // for SetColorSupport, Color, TrueColor
+#include "dbc.hpp"
 
 using std::string;
 using namespace fmt;
@@ -40,9 +41,13 @@ void System::init_positions(DinkyECS::World &world) {
         collider.insert(pos.location, ent);
       }
   });
+
+  world.query<Position, Loot>([&](const auto &ent, auto &pos, auto &loot) {
+      collider.insert(pos.location, ent);
+  });
 }
 
-inline void move_entity(spatial_map &collider, Map &game_map, Position &position, Motion &motion, DinkyECS::Entity ent) {
+inline bool move_entity(spatial_map &collider, Map &game_map, Position &position, Motion &motion, DinkyECS::Entity ent) {
   Point move_to = {
     position.location.x + motion.dx,
     position.location.y + motion.dy
@@ -50,25 +55,31 @@ inline void move_entity(spatial_map &collider, Map &game_map, Position &position
   motion = {0,0}; // clear it after getting it
 
   if(game_map.inmap(move_to.x, move_to.y) &&
-      !game_map.iswall(move_to.x, move_to.y) &&
-      !collider.occupied(move_to))
+      !game_map.iswall(move_to.x, move_to.y))
   {
+    if(collider.occupied(move_to)) {
+      return true;
+    } else {
       collider.move(position.location, move_to, ent);
       position.location = move_to;
+      return false;
+    }
+  } else {
+    return false;
   }
 }
 
 void System::motion(DinkyECS::World &world, Map &game_map) {
   auto &collider = world.get_the<spatial_map>();
-  auto &player = world.get_the<Player>();
-  auto &player_position = world.get<Position>(player.entity);
-  auto &player_motion = world.get<Motion>(player.entity);
-  move_entity(collider, game_map, player_position, player_motion, player.entity);
 
   world.query<Position, Motion>([&](const auto &ent, auto &position, auto &motion) {
     // don't process entities that don't move
     if(motion.dx != 0 || motion.dy != 0) {
-      move_entity(collider, game_map, position, motion, ent);
+      // if there's a collision
+      if(move_entity(collider, game_map, position, motion, ent)) {
+        // send a collision event?
+        println("hit it!");
+      }
     }
   });
 }
@@ -99,6 +110,7 @@ void System::combat(DinkyECS::World &world, Player &player) {
 
   if(found) {
     for(auto entity : nearby) {
+      if(world.has<Combat>(entity)) {
         auto& enemy_combat = world.get<Combat>(entity);
         int player_dmg = player_combat.attack(enemy_combat);
 
@@ -119,6 +131,11 @@ void System::combat(DinkyECS::World &world, Player &player) {
         } else {
             world.send<Events::GUI>(Events::GUI::DEAD, entity);
         }
+      } else if(world.has<Loot>(entity)) {
+        println("YOU FOUND LOOT");
+      } else {
+        println("UNKNOWN COLLISION TYPE {}", entity);
+      }
     }
   }
 };

tests/dinkyecs.cpp

@@ -111,8 +111,10 @@ TEST_CASE("confirm ECS system works", "[ecs]") {
   });
 
   // now remove Velocity
+  REQUIRE(world.has<Velocity>(test));
   world.remove<Velocity>(test);
   REQUIRE_THROWS(world.get<Velocity>(test));
+  REQUIRE(!world.has<Velocity>(test));
 
   println("--- After remove test, should only result in test2:");
   world.query<Position, Velocity>([&](const auto &ent, auto &pos, auto &vel) {