Make a few comments to keep this straight.

systems.cpp

@@ -47,7 +47,9 @@ void System::combat(DinkyECS::World &world, Player &player) {
 
   world.system<Position, Combat>([&](const auto &ent, auto &pos, auto &combat) {
       if(ent != player.entity && pos.location.x == player_position.location.x &&
-          pos.location.y == player_position.location.y) {
+          pos.location.y == player_position.location.y)
+      {
+        // need to sort out combat here
       }
   });
 };
@@ -57,6 +59,7 @@ void System::draw_entities(DinkyECS::World &world, Map &game_map, ftxui::Canvas
     if(pos.location.x >= cam_orig.x && pos.location.x <= cam_orig.x + view_x
         && pos.location.y >= cam_orig.y && pos.location.y <= cam_orig.y + view_y) {
       Point loc = game_map.map_to_camera(pos.location, cam_orig);
+      // the 2 and 4 are from ftxui::Canvas since it does a kind of "subpixel" drawing
       canvas.DrawText(loc.x*2, loc.y*4, tile.chr);
     }
   });
@@ -74,6 +77,7 @@ void System::draw_map(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canv
   for(size_t x = 0; x < end_x; ++x) {
     for(size_t y = 0; y < end_y; ++y) {
       string tile = walls[start.y+y][start.x+x] == 1 ? WALL_TILE : FLOOR_TILE;
+      // the 2 and 4 are from ftxui::Canvas since it does a kind of "subpixel" drawing
       canvas.DrawText(x * 2, y * 4, tile);
     }
   }