Here is a codepen example, this code was thrown together. You can add modify the fence line in the colorFence array http://codepen.io/anon/pen/ycqpI?editors=10

Here is a codepen example, this code was thrown together. You can add modify the fence line in the colorFence array http://codepen.io/anon/pen/ycqpI?editors=101 http://codepen.io/anon/pen/ycqpI?editors=101