1 files changed, 21 insertions, 0 deletions
diff --git a/city/geometry.lua b/city/geometry.lua
index 13088d1..78c2aa7 100644
--- a/city/geometry.lua
+++ b/city/geometry.lua
@@ -80,4 +80,25 @@ geom.square = class{
    end
 }
 
+
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+--
+-- qt_node
+--
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+geom.qt_node = class{
+   __call = function(this, center, span)
+      local node = {}
+      node.square = geom.square(center, span)
+      setmetatable(node, {__index=this})
+      return node
+   end,
+
+   is_leaf = function(self)
+      if self.children then return true end
+      return false
+   end,
+}
+
 return geom