3 files changed, 19 insertions, 1 deletions
diff --git a/src/main/game/cell.c b/src/main/game/cell.c
index 53d051a..c8151b2 100644
--- a/src/main/game/cell.c
+++ b/src/main/game/cell.c
@@ -45,6 +45,7 @@ cell_new(float left, float right, float top, float bottom)
 	cell->right = right;
 	cell->top = top;
 	cell->bottom = bottom;
+	cell->filled = false;
 
 	return cell;
 }
@@ -54,3 +55,16 @@ cell_within_bounds(Cell *cell, float x, float y)
 {
 	return x >= cell->left && x <= cell->right && y <= cell->top && y >= cell->bottom;
 }
+
+void
+cell_set_filled(Cell *cell, bool filled)
+{
+	if (cell == NULL) return;
+	cell->filled = filled;
+}
+
+bool
+cell_is_filled(Cell *cell) {
+	if (cell == NULL) return false;
+	return cell->filled;
+}
diff --git a/src/main/game/cell.h b/src/main/game/cell.h
index 50a5606..000edfb 100644
--- a/src/main/game/cell.h
+++ b/src/main/game/cell.h
@@ -24,9 +24,12 @@
 
 typedef struct Cell {
 	float left, right, top, bottom;
+	bool filled;
 } Cell;
 
 Cell *cell_new(float left, float right, float top, float bottom);
 bool  cell_within_bounds(Cell *cell, float x, float y);
+void  cell_set_filled(Cell *cell, bool filled);
+bool  cell_is_filled(Cell *cell);
 
 #endif /* __GAME_CELL_H__ */
diff --git a/src/main/game/game.c b/src/main/game/game.c
index 25de722..2e2db8f 100644
--- a/src/main/game/game.c
+++ b/src/main/game/game.c
@@ -77,7 +77,8 @@ loop_cells(list_t *cells, float x, float y)
 	list_node_t *current = cells->head;
 	do {
 		Cell *cell = current->data;
-		if (cell_within_bounds(cell, x, y)) {
+		if (!cell_is_filled(cell) && cell_within_bounds(cell, x, y)) {
+			cell_set_filled(cell, true);
 		}
 		current = current->next;
 	} while (current != NULL);