add quadtree freeing

1 files changed, 13 insertions, 0 deletions

diff --git a/experimental/tectonics/quadtree.c b/experimental/tectonics/quadtree.c
index dead9f2..0f3f9c7 100644
--- a/experimental/tectonics/quadtree.c
+++ b/experimental/tectonics/quadtree.c
@@ -133,3 +133,16 @@ void draw_quadtree(cairo_t *cr, struct quadtree_node_t *node)
       draw_quadtree(cr, node->se);
    }
 }
+
+
+void free_tree(struct quadtree_node_t *node)
+{
+   if (node->nw != NULL) {
+      free_tree(node->nw);
+      free_tree(node->ne);
+      free_tree(node->sw);
+      free_tree(node->se);
+   }
+
+   free(node);
+}