Creating conditional select options without using AJAX for questions: http://stackoverflow.com/questions/38529548/how-to-get-multiple-dropdown-with-using-jquery-json
How to get four corner rotate handles when using jQuery UI Rotatable plugin from https://github.com/godswearhats/jquery-ui-rotatable. Answer to this question: http://stackoverflow.com/questions/38460183/how-to-get-four-corners-rotate-handle-for-a-rotatable-div