You can now set a sprite as a background in Background which will simplify a lot of games that just place sprites over a single image.

src/guecs/lel.cpp

@@ -11,27 +11,36 @@ namespace lel {
     grid_x(x),
     grid_y(y),
     grid_w(width),
-    grid_h(height),
-    cur(0, 0)
+    grid_h(height)
   {
   }
 
-  Parser::Parser() : cur(0, 0) { }
-
   void Parser::position(int x, int y, int width, int height) {
     grid_x = x;
     grid_y = y;
     grid_w = width;
     grid_h = height;
+
+    // used in GUIs for setting backgrounds
+    main = {
+      .x=grid_x,
+      .y=grid_y,
+      .w=grid_w,
+      .h=grid_h,
+      .mid_x=std::midpoint(grid_x, grid_x + grid_w),
+      .mid_y=std::midpoint(grid_y, grid_y + grid_h),
+      .max_w=grid_w,
+      .max_h=grid_h
+    };
   }
 
-  void Parser::id(std::string name) {
+  void Parser::id(const std::string& name) {
     if(name != "_") {
       assert(!cells.contains(name) && "duplicate cell name");
       cells.insert_or_assign(name, cur);
     }
 
-    cur = {cur.col + 1, cur.row};
+    cur = {.col=cur.col + 1, .row=cur.row};
     auto& row = grid.back();
     row.push_back(name);
   }
@@ -87,15 +96,18 @@ namespace lel {
   }
 
   void Parser::reset() {
-    cur = {0, 0};
+    cur = {.col=0, .row=0};
+    main = {.col=0, .row=0};
     grid.clear();
     cells.clear();
   }
 
   std::optional<std::string> Parser::hit(int x, int y) {
     for(auto& [name, cell] : cells) {
-      if((x >= cell.x && x <= cell.x + cell.w) &&
-          (y >= cell.y && y <= cell.y + cell.h)) {
+      if(name != "_MAIN" &&
+          (x >= cell.x && x <= cell.x + cell.w) &&
+          (y >= cell.y && y <= cell.y + cell.h))
+      {
         return name;
       }
     }
@@ -106,6 +118,7 @@ namespace lel {
   Cell center(int width, int height, Cell &parent) {
     Cell copy = parent;
 
+    // BUG: could I use std::midpoint here or am I even using this?
     copy.x = parent.mid_x - width / 2;
     copy.y = parent.mid_y - height / 2;
     copy.w = width;