Started the overlay UI but need to make it possible to add/remove components to it.

overlay_ui.cpp

@@ -0,0 +1,36 @@
+#include "overlay_ui.hpp"
+#include "constants.hpp"
+#include "color.hpp"
+#include "events.hpp"
+
+namespace gui {
+  using namespace guecs;
+
+  OverlayUI::OverlayUI(GameLevel level) :
+    $level(level)
+  {
+    $gui.position(RAY_VIEW_X, RAY_VIEW_Y, RAY_VIEW_WIDTH, RAY_VIEW_HEIGHT);
+    $gui.layout(
+        "[top_left|top|top_right]"
+        "[*%(300,300)middle|_|_]"
+        "[_|_|_]"
+        "[_|_|_]"
+        "[bottom_left|bottom|bottom_right]"
+        );
+  }
+
+  void OverlayUI::render(TexturePack &textures) {
+    auto &world = $gui.world();
+    for(auto &[name, cell] : $gui.cells()) {
+      auto region = $gui.entity(name);
+      $name_ents.insert_or_assign(name, region);
+      world.set<lel::Cell>(region, cell);
+    }
+    $gui.init(textures);
+  }
+
+  void OverlayUI::draw(sf::RenderWindow& window) {
+    $gui.render(window);
+  }
+
+}