HP bar is working, and next just need to make the combat gui actually work.

combat_ui.cpp

@@ -11,27 +11,31 @@ namespace gui {
   {
     bool good = $layout.parse($grid);
     dbc::check(good, "failed to parse combat layout");
-
     render();
   }
 
   void CombatUI::render() {
+    $background.setPosition({float($layout.grid_x), float($layout.grid_y)});
+    $background.setSize({float($layout.grid_w), float($layout.grid_h)});
+    $background.setFillColor({0, 0, 0});
+
     for(auto& [name, cell] : $layout.cells) {
       sf::RectangleShape shape;
       shape.setPosition({float(cell.x + 3), float(cell.y + 3)});
       shape.setSize({float(cell.w - 6), float(cell.h - 6)});
       shape.setFillColor({100, 100, 100});
+      shape.setOutlineColor({200, 200, 200});
+      shape.setOutlineThickness(1);
 
       if(name.starts_with("button_")) {
-        shape.setOutlineColor({200, 200, 200});
-        shape.setOutlineThickness(1);
-
         sf::Text label($font, name);
         auto bounds = label.getLocalBounds();
         auto label_cell = lel::center(bounds.size.x, bounds.size.y, cell);
         // this stupid / 2 is because SFML renders from baseline rather than from the claimed bounding box
         label.setPosition({float(label_cell.x), float(label_cell.y) - label_cell.h / 2});
         $labels.push_back(label);
+      } else if(name == "bar_hp") {
+        shape.setFillColor({50, 200, 50});
       }
 
       $shapes.insert_or_assign(name, shape);
@@ -39,6 +43,16 @@ namespace gui {
   }
 
   void CombatUI::draw(sf::RenderWindow& window) {
+    auto &player = $level.world->get_the<components::Player>();
+    auto &combat = $level.world->get<components::Combat>(player.entity);
+
+    auto &hp_shape = $shapes.at("bar_hp");
+    auto &hp_cell = $layout.cells.at("bar_hp");
+    float hp_now = float(combat.hp) / float(combat.max_hp) * float(hp_cell.w);
+    hp_shape.setSize({std::max(hp_now, 0.0f), float(hp_cell.h - 6)});
+
+    window.draw($background);
+
     for(auto& [name, shape] : $shapes) {
       window.draw(shape);
     }

combat_ui.hpp

@@ -16,6 +16,7 @@ namespace gui {
       lel::Parser $layout;
       GameLevel $level;
       sf::Font $font;
+      sf::RectangleShape $background;
       std::unordered_map<std::string, sf::RectangleShape> $shapes;
       std::unordered_map<std::string, sf::RectangleShape> $label_boxes;
       std::vector<sf::Text> $labels;