Little refactoring

point.lua

@@ -29,3 +29,14 @@ end
 function Point:coords()
     return self.x, self.y
 end
+
+-- Return vector length between points
+---@param point Point
+---@return number
+function Point:distanceTo( point )
+    return math.sqrt(
+        ( self.x - point.x ) ^ 2 +
+        ( self.y - point.y ) ^ 2
+    )
+end
+