Light works with multiple sources and strengths, walls are faked out but I think I may keep that to make it easier to play.

collider.cpp

@@ -22,6 +22,10 @@ bool spatial_map::occupied(Point at) const {
   return table.contains(at);
 }
 
+Entity spatial_map::get(Point at) const {
+  return table.at(at);
+}
+
 /*
  * Avoid doing work by using the dy,dx and confirming that
  * at.x or at.y is > 0.  If either is 0 then there can't be

collider.hpp

@@ -22,6 +22,7 @@ class spatial_map {
     void move(Point from, Point to, DinkyECS::Entity ent);
     void remove(Point pos);
     bool occupied(Point pos) const;
+    DinkyECS::Entity get(Point at) const;
     FoundEntities neighbors(Point position, bool diag=false) const;
 
   private:

main.cpp

@@ -33,7 +33,7 @@ void configure_world(DinkyECS::World &world, Map &game_map) {
   world.set<Combat>(player.entity, {100, 10});
   world.set<Tile>(player.entity, {config.PLAYER_TILE});
   world.set<Inventory>(player.entity, {5});
-  world.set<LightSource>(player.entity, {150});
+  world.set<LightSource>(player.entity, {50});
 
   auto enemy = world.entity();
   world.set<Position>(enemy, {game_map.place_entity(1)});
@@ -46,11 +46,18 @@ void configure_world(DinkyECS::World &world, Map &game_map) {
   world.set<Motion>(enemy2, {0,0});
   world.set<Combat>(enemy2, {20, 10});
   world.set<Tile>(enemy2, {"*"});
+  world.set<LightSource>(enemy2, {100});
 
   auto gold = world.entity();
   world.set<Position>(gold, {game_map.place_entity(3)});
   world.set<Loot>(gold, {100});
   world.set<Tile>(gold, {"$"});
+
+
+  auto wall_torch = world.entity();
+  world.set<Position>(wall_torch, {game_map.place_entity(4)});
+  world.set<LightSource>(wall_torch, {200});
+  world.set<Tile>(wall_torch, {"!"});
 }
 
 const int GAME_MAP_X = 40;

status.txt

@@ -1,8 +1,11 @@
 TODAY'S GOAL:
-
-TODO:
 * Neighbors needs a rewrite
 * Neighbors algo isn't using greater parameter
+* Refine the lighting to support multiple lights.
+* Think up an enemy system.
+* Revisit map generation.
+
+TODO:
 * Write a method for renderer that can translate coordinates.
 * Can std::any be defaulted to a noop in the events?
 * Save file isn't saving gold.

systems.cpp

@@ -20,23 +20,49 @@ const int LIGHT_MIN = 20;
 const int LIGHT_MAX = 160;
 
 void System::lighting(DinkyECS::World &world, Map &game_map, Player &player) {
-  const auto& player_light = world.get<LightSource>(player.entity);
-  auto &paths = game_map.paths();
+  using std::min, std::max, std::clamp;
+
   auto &lighting = game_map.lighting();
   std::vector<Point> has_light;
 
-  for(size_t x = 0; x < game_map.width(); ++x) {
-    for(size_t y = 0; y < game_map.height(); ++y) {
-      int dnum = paths[y][x];
-      int light = std::clamp(255 - (dnum * player_light.strength), LIGHT_MIN, LIGHT_MAX);
-      lighting[y][x] = light;
-
-      if(light > LIGHT_MIN) {
-        has_light.push_back({x,y});
-      }
+  for(auto &row : lighting) {
+    for(size_t i = 0; i < row.size(); i++) {
+      row[i] = LIGHT_MIN;
     }
   }
 
+  world.query<Position, LightSource>([&](const auto &ent, auto &position, auto &lightsource) {
+      game_map.set_target(position.location);
+  });
+
+  game_map.make_paths();
+  auto &paths = game_map.paths();
+
+  world.query<Position, LightSource>([&](const auto &ent, auto &position, auto &lightsource) {
+      game_map.clear_target(position.location);
+      int strength = 255 - lightsource.strength;
+
+      size_t dist = size_t((float(lightsource.strength) / 255.0) * 3) + 1;
+
+      size_t min_x = max(position.location.x, dist) - dist;
+      size_t max_x = min(position.location.x + dist, game_map.width() - 1);
+      size_t min_y = max(position.location.y, dist) - dist;
+      size_t max_y = min(position.location.y + dist, game_map.height() - 1);
+
+      for(size_t x = min_x; x <= max_x; ++x) {
+        for(size_t y = min_y; y <= max_y; ++y) {
+          int dnum = paths[y][x];
+          int light = std::clamp(255 - (strength * dnum), LIGHT_MIN, LIGHT_MAX);
+          if(lighting[y][x] < light) {
+            lighting[y][x] = light;
+
+            if(light > LIGHT_MIN) {
+              has_light.push_back({x, y});
+            }
+          }
+        }
+      }
+  });
 
   const int UNPATH = game_map.limit();