clone functions

mechanism.lua

@@ -55,6 +55,20 @@ function Mechanism:new( position, size, ports, color )
     return mechanism
 end
 
+function Mechanism:clone()
+    local ports = {}
+    for _, port in ipairs(self.ports) do
+        local clonedPort = port:clone()
+        table.insert(ports, clonedPort)
+    end
+    local mechanism = {
+        position = GridPoint:new( self.position.x, self.position.y ),
+        size = GridPoint:new( self.size.x, self.size.y ),
+        ports = ports,
+        color = self.color
+    }
+end
+
 function Mechanism:rotateClockwise()
     self.size = GridPoint:new(self.size.y, self.size.x)
     self.xcorner = nextxcorner(self.xcorner, self.size)