1 files changed, 28 insertions, 0 deletions
diff --git a/city/geometry.lua b/city/geometry.lua
new file mode 100644
index 0000000..47e6a78
--- /dev/null
+++ b/city/geometry.lua
@@ -0,0 +1,28 @@
+local geom = {}
+
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+--
+-- point
+--
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+local point = {
+   __call = function(_, x, y)
+      local pt = {}
+      pt.x = x
+      pt.y = y
+      setmetatable(pt, {__index=_})
+      return pt
+   end,
+
+   distance_to = function(self, pt)
+      local d_x = self.x - pt.x
+      local d_y = self.y - pt.y
+      return math.sqrt(d_x*d_x + d_y*d_y)
+   end,
+}
+setmetatable(point, point)
+geom.point = point
+
+
+return geom